diff options
Diffstat (limited to 'drivers/tsd')
| -rw-r--r-- | drivers/tsd/tsd.dir | 42 | ||||
| -rw-r--r-- | drivers/tsd/tsd.h | 74 | ||||
| -rw-r--r-- | drivers/tsd/tsd_ads7843.c | 438 | ||||
| -rw-r--r-- | drivers/tsd/tsd_com.c | 390 | ||||
| -rw-r--r-- | drivers/tsd/tsd_com.h | 48 | ||||
| -rw-r--r-- | drivers/tsd/tsd_tsadc.c | 269 |
6 files changed, 1261 insertions, 0 deletions
diff --git a/drivers/tsd/tsd.dir b/drivers/tsd/tsd.dir new file mode 100644 index 0000000..c72fa6f --- /dev/null +++ b/drivers/tsd/tsd.dir @@ -0,0 +1,42 @@ +/* ----------------------------------------------------------------------------
+ * ATMEL Microcontroller Software Support
+ * ----------------------------------------------------------------------------
+ * Copyright (c) 2008, Atmel Corporation
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * - Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the disclaimer below.
+ *
+ * Atmel's name may not be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * DISCLAIMER: THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
+ * DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
+ * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
+ * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ * ----------------------------------------------------------------------------
+ */
+
+//------------------------------------------------------------------------------
+/// \dir
+///
+/// !!!Contents
+///
+/// This directory contains the source code of the touchscreen driver. tsd.h
+/// contains all the interface functions definitions. tsd_tsadc.c contains the
+/// implementation of the driver for the chip that have the peripheral ip TSADC.
+/// tsd_ads7843.c contains the driver implementation for board that have the
+/// external component ads7843 (the chip has not the peripheral ip TSDADC).
+/// tds_com.c contains all the common function for the two driver implementations
+/// (calibration functions).
+//------------------------------------------------------------------------------
diff --git a/drivers/tsd/tsd.h b/drivers/tsd/tsd.h new file mode 100644 index 0000000..22a4930 --- /dev/null +++ b/drivers/tsd/tsd.h @@ -0,0 +1,74 @@ +/* ----------------------------------------------------------------------------
+ * ATMEL Microcontroller Software Support
+ * ----------------------------------------------------------------------------
+ * Copyright (c) 2008, Atmel Corporation
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * - Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the disclaimer below.
+ *
+ * Atmel's name may not be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * DISCLAIMER: THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
+ * DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
+ * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
+ * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ * ----------------------------------------------------------------------------
+ */
+
+//------------------------------------------------------------------------------
+/// \unit
+///
+/// !!!Purpose
+///
+/// This unit provides a very powerful touchscreen driver which handles all the
+/// complexity. This includes touchscreen calibration, retrieving measurements,
+/// configuring the TSADC, etc.
+///
+/// !!!Usage
+///
+/// -# Call TSD_Initialize() whenever the touchscreen should start the
+/// calibration process (as it is done in the function).
+/// -# Declare a global TSD_PenPressed function anywhere in your code. This
+/// function will get called every time the pen is pressed on the screen.
+/// -# Declare a global TSD_PenMoved function, which will get called whenever
+/// the pen stays in contact with the screen but changes position.
+/// -# Declare a global TSD_PenReleased function, which will be invoked as the
+/// pen is lifted from the screen.
+//------------------------------------------------------------------------------
+
+#ifndef TSD_H
+#define TSD_H
+
+//------------------------------------------------------------------------------
+// Headers
+//------------------------------------------------------------------------------
+
+#include "tsd_com.h"
+
+//------------------------------------------------------------------------------
+// Global functions
+//------------------------------------------------------------------------------
+
+extern void TSD_Initialize(void *pLcdBuffer);
+
+extern unsigned char TSD_Calibrate(void *pLcdBuffer);
+
+extern void TSD_Reset(void);
+
+#ifdef at91sam3u
+extern void TSD_TimerHandler(void);
+#endif
+
+#endif //#ifndef TSD_H
diff --git a/drivers/tsd/tsd_ads7843.c b/drivers/tsd/tsd_ads7843.c new file mode 100644 index 0000000..3800a5f --- /dev/null +++ b/drivers/tsd/tsd_ads7843.c @@ -0,0 +1,438 @@ +/* ----------------------------------------------------------------------------
+ * ATMEL Microcontroller Software Support
+ * ----------------------------------------------------------------------------
+ * Copyright (c) 2008, Atmel Corporation
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * - Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the disclaimer below.
+ *
+ * Atmel's name may not be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * DISCLAIMER: THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
+ * DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
+ * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
+ * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ * ----------------------------------------------------------------------------
+ */
+
+//------------------------------------------------------------------------------
+// Headers
+//------------------------------------------------------------------------------
+
+#include <board.h>
+
+#ifdef BOARD_TSC_ADS7843
+
+#include "tsd.h"
+#include "tsd_com.h"
+#include <irq/irq.h>
+#include <pio/pio.h>
+#include <pio/pio_it.h>
+#if defined(cortexm3)
+#include <systick/systick.h>
+#else
+#include <pit/pit.h>
+#endif
+#include <ads7843/ads7843.h>
+#include <drivers/lcd/lcdd.h>
+#include <drivers/lcd/draw.h>
+#include <drivers/lcd/font.h>
+
+#include <string.h>
+
+//------------------------------------------------------------------------------
+// Local definitions
+//------------------------------------------------------------------------------
+
+/// PIT period value in µseconds.
+#define PIT_PERIOD 10000 // 10 ms
+
+/// Delay for pushbutton debouncing (in PIT_PERIOD time-base).
+#define DEBOUNCE_TIME 6 // PIT_PERIOD * 6 = 60 ms
+
+/// Color of calibration points.
+#define POINTS_COLOR 0x0000FF
+
+/// Size in pixels of calibration points.
+#define POINTS_SIZE 4
+
+/// Maximum difference in pixels between the test point and the measured point.
+#define POINTS_MAX_ERROR 5
+
+//------------------------------------------------------------------------------
+// Local types
+//------------------------------------------------------------------------------
+
+/// pen state
+typedef enum {
+ STATE_PEN_RELEASED = 0,
+ STATE_PEN_PRESSED = 1,
+ STATE_PEN_DEBOUNCE = 2
+} e_pen_state;
+
+
+//------------------------------------------------------------------------------
+// Local variables
+//------------------------------------------------------------------------------
+
+/// Pins used by Interrupt Signal for Touch Screen Controller
+static Pin pinPenIRQ = PIN_TCS_IRQ;
+
+/// Global timestamp in milliseconds since start of application.
+static volatile unsigned int timestamp = 0;
+
+/// last time when the pen is pressed on the touchscreen
+static volatile unsigned int timePress = 0;
+
+/// last time when the pen is released
+static volatile unsigned int timeRelease = 0;
+
+/// pen state
+static volatile e_pen_state penState = STATE_PEN_RELEASED;
+
+/// Touch screen initiallized flag
+static unsigned int tsInitFlag = 0;
+
+//------------------------------------------------------------------------------
+// External functions
+//------------------------------------------------------------------------------
+
+extern void TSD_PenPressed(unsigned int x, unsigned int y);
+extern void TSD_PenMoved(unsigned int x, unsigned int y);
+extern void TSD_PenReleased(unsigned int x, unsigned int y);
+
+//------------------------------------------------------------------------------
+// Local functions
+//------------------------------------------------------------------------------
+extern void TSD_GetRawMeasurement(unsigned int *pData);
+
+#if defined(cortexm3)
+//------------------------------------------------------------------------------
+/// Timer handler for touch screen. Increments the timestamp counter.
+/// Determine the state "Pen Pressed" or "Pen Released". To change state,
+/// the penIRQ has to keep the same value during DEBOUNCE_TIME.
+/// For AT91SAM3, SysTick interrupt should call it per 10ms.
+//------------------------------------------------------------------------------
+void TSD_TimerHandler(void)
+{
+ unsigned int data[2];
+ static unsigned int point[2];
+
+ if (!tsInitFlag) return;
+
+ timestamp++;
+ // Get the current position of the pen if penIRQ has low value (pen pressed)
+ if (PIO_Get(&pinPenIRQ) == 0) {
+
+ // Get the current position of the pressed pen
+ if(TSDCom_IsCalibrationOk()) {
+ TSD_GetRawMeasurement(data);
+ TSDCom_InterpolateMeasurement(data, point);
+ }
+
+ // call the callback function
+ if(penState == STATE_PEN_PRESSED) {
+ if(TSDCom_IsCalibrationOk()) {
+ TSD_PenMoved(point[0], point[1]);
+ }
+ }
+ }
+
+ // Determine the pen state
+ if (PIO_Get(&pinPenIRQ) == 0) {
+
+ // reinit the last time when release
+ timeRelease = timestamp;
+
+ if(penState == STATE_PEN_DEBOUNCE) {
+
+ if( (timestamp - timePress) > DEBOUNCE_TIME) {
+
+ // pen is pressed during an enough time : the state change
+ penState = STATE_PEN_PRESSED;
+ // call the callback function
+ if(TSDCom_IsCalibrationOk()) {
+ TSD_PenPressed(point[0], point[1]);
+ }
+ }
+ }
+ }
+ else {
+ // reinit the last time when release
+ timePress = timestamp;
+
+ if(penState == STATE_PEN_DEBOUNCE) {
+
+ if( (timestamp - timeRelease) > DEBOUNCE_TIME) {
+
+ // pen is released during an enough time : the state change
+ penState = STATE_PEN_RELEASED;
+ // call the callback function
+ if(TSDCom_IsCalibrationOk()) {
+ TSD_PenReleased(point[0], point[1]);
+ }
+ }
+ }
+ }
+}
+
+#else // For SAM7/SAM9
+
+//------------------------------------------------------------------------------
+/// Handler for PIT interrupt. Increments the timestamp counter.
+/// Determine the state "Pen Pressed" or "Pen Released". To change state,
+/// the penIRQ has to keep the same value during DEBOUNCE_TIME.
+//------------------------------------------------------------------------------
+static void ISR_Pit(void)
+{
+ unsigned int status;
+ unsigned int data[2];
+ static unsigned int point[2];
+
+ // Read the PIT status register
+ status = PIT_GetStatus() & AT91C_PITC_PITS;
+ if (status != 0) {
+
+ // Read the PIVR to acknowledge interrupt and get number of ticks
+ timestamp += (PIT_GetPIVR() >> 20);
+ }
+
+ // Get the current position of the pen if penIRQ has low value (pen pressed)
+ if (PIO_Get(&pinPenIRQ) == 0) {
+
+ // Get the current position of the pressed pen
+ PIO_DisableIt(&pinPenIRQ);
+ ADS7843_GetPosition(&data[0], &data[1]);
+ PIO_EnableIt(&pinPenIRQ);
+
+ TSD_GetRawMeasurement(data);
+ TSDCom_InterpolateMeasurement(data, point);
+
+ // call the callback function
+ if(penState == STATE_PEN_PRESSED) {
+ if(TSDCom_IsCalibrationOk()) {
+ TSD_PenMoved(point[0], point[1]);
+ }
+ }
+ }
+
+ // Determine the pen state
+ if (PIO_Get(&pinPenIRQ) == 0) {
+
+ // reinit the last time when release
+ timeRelease = timestamp;
+
+ if(penState == STATE_PEN_DEBOUNCE) {
+
+ if( (timestamp - timePress) > DEBOUNCE_TIME) {
+
+ // pen is pressed during an enough time : the state change
+ penState = STATE_PEN_PRESSED;
+ // call the callback function
+ if(TSDCom_IsCalibrationOk()) {
+ TSD_PenPressed(point[0], point[1]);
+ }
+ }
+ }
+ }
+ else {
+ // reinit the last time when release
+ timePress = timestamp;
+
+ if(penState == STATE_PEN_DEBOUNCE) {
+
+ if( (timestamp - timeRelease) > DEBOUNCE_TIME) {
+
+ // pen is released during an enough time : the state change
+ penState = STATE_PEN_RELEASED;
+ // call the callback function
+ if(TSDCom_IsCalibrationOk()) {
+ TSD_PenReleased(point[0], point[1]);
+ }
+ }
+ }
+ }
+}
+#endif
+
+//------------------------------------------------------------------------------
+/// Interrupt handler for Touchscreen.
+//------------------------------------------------------------------------------
+static void ISR_PenIRQ(void)
+{
+ // Check if the pen has been pressed
+ if (!PIO_Get(&pinPenIRQ)) {
+
+ if(penState == STATE_PEN_RELEASED) {
+
+ timePress = timestamp;
+ penState = STATE_PEN_DEBOUNCE;
+ }
+ }
+ else {
+
+ if(penState == STATE_PEN_PRESSED) {
+
+ timeRelease = timestamp;
+ penState = STATE_PEN_DEBOUNCE;
+ }
+ }
+}
+
+#if !defined(cortexm3)
+//------------------------------------------------------------------------------
+/// Configure the periodic interval timer to generate an interrupt every 10 ms
+//------------------------------------------------------------------------------
+static void ConfigurePit(void)
+{
+ // Initialize the PIT to the desired frequency
+ PIT_Init(PIT_PERIOD, BOARD_MCK / 1000000);
+
+ // Configure interrupt on PIT
+ IRQ_DisableIT(AT91C_ID_SYS);
+ IRQ_ConfigureIT(AT91C_ID_SYS, AT91C_AIC_PRIOR_LOWEST, ISR_Pit);
+ IRQ_EnableIT(AT91C_ID_SYS);
+ PIT_EnableIT();
+
+ // Enable the pit
+ PIT_Enable();
+}
+#endif
+
+//-----------------------------------------------------------------------------
+/// Configure PENIRQ for interrupt
+//-----------------------------------------------------------------------------
+void ConfigurePenIRQ(void)
+{
+ // Configure pios
+ PIO_Configure(&pinPenIRQ, PIO_LISTSIZE(pinPenIRQ));
+
+ // Initialize interrupts
+#if defined(cortexm3)
+ PIO_InitializeInterrupts(0);
+#else // For SAM7/SAM9
+ PIO_InitializeInterrupts(AT91C_AIC_PRIOR_HIGHEST);
+#endif
+ PIO_ConfigureIt(&pinPenIRQ, (void (*)(const Pin *)) ISR_PenIRQ);
+
+ // Enable the interrupt
+ PIO_EnableIt(&pinPenIRQ);
+}
+
+//------------------------------------------------------------------------------
+// Global functions
+//------------------------------------------------------------------------------
+
+//------------------------------------------------------------------------------
+/// Reads and store a touchscreen measurement in the provided array.
+/// \param pData Array where the measurements will be stored
+//------------------------------------------------------------------------------
+void TSD_GetRawMeasurement(unsigned int *pData)
+{
+#if defined(cortexm3)
+ // Get the current position of the pressed pen
+ PIO_DisableIt(&pinPenIRQ);
+ ADS7843_GetPosition(&pData[0], &pData[1]);
+ PIO_EnableIt(&pinPenIRQ);
+#else
+ // Get the current position of the pressed pen
+ PIO_DisableIt(&pinPenIRQ);
+ ADS7843_GetPosition(&pData[0], &pData[1]);
+ PIO_EnableIt(&pinPenIRQ);
+#endif
+}
+
+//------------------------------------------------------------------------------
+/// Wait pen pressed
+//------------------------------------------------------------------------------
+void TSD_WaitPenPressed(void)
+{
+ // Wait for touch & end of conversion
+ while (penState != STATE_PEN_RELEASED);
+ while (penState != STATE_PEN_PRESSED);
+}
+
+//------------------------------------------------------------------------------
+/// Wait pen released
+//------------------------------------------------------------------------------
+void TSD_WaitPenReleased(void)
+{
+ // Wait for contact loss
+ while (penState != STATE_PEN_PRESSED);
+ while (penState != STATE_PEN_RELEASED);
+}
+
+//------------------------------------------------------------------------------
+/// Do calibration
+/// \param pLcdBuffer LCD buffer to use for displaying the calibration info.
+/// \return 1 if calibration is Ok, 0 else
+//------------------------------------------------------------------------------
+unsigned char TSD_Calibrate(void *pLcdBuffer)
+{
+ unsigned char ret = 0;
+
+ // Calibration is done only once
+ if(TSDCom_IsCalibrationOk()) {
+ return 1;
+ }
+
+ // Do calibration
+ ret = TSDCom_Calibrate(pLcdBuffer);
+
+ return ret;
+}
+
+//------------------------------------------------------------------------------
+/// Initializes the touchscreen driver and starts the calibration process. When
+/// finished, the touchscreen is operational.
+///
+/// Important: the LCD driver must have been initialized prior to calling this
+/// function.
+/// \param pBuffer LCD buffer to use for displaying the calibration info.
+//------------------------------------------------------------------------------
+void TSD_Initialize(void *pLcdBuffer)
+{
+ ADS7843_Initialize();
+ ConfigurePenIRQ();
+#if !defined(cortexm3)
+ ConfigurePit();
+#endif
+ tsInitFlag = 1;
+
+ // Calibration
+ if(pLcdBuffer) {
+ while (!TSD_Calibrate(pLcdBuffer));
+ }
+}
+
+//------------------------------------------------------------------------------
+/// Stop the Touchscreen, disable interrupt and stop Pit
+//------------------------------------------------------------------------------
+void TSD_Reset(void)
+{
+ // Disable SPI 0
+ ADS7843_Reset();
+
+ // Disable the interrupt
+ PIO_DisableIt(&pinPenIRQ);
+
+#if !defined(cortexm3)
+ // Stop Pit interrupt
+ PIT_DisableIT();
+ IRQ_DisableIT(AT91C_ID_SYS);
+#endif
+}
+
+#endif //#ifdef BOARD_TSC_ADS7843
diff --git a/drivers/tsd/tsd_com.c b/drivers/tsd/tsd_com.c new file mode 100644 index 0000000..a930cc9 --- /dev/null +++ b/drivers/tsd/tsd_com.c @@ -0,0 +1,390 @@ +/* ----------------------------------------------------------------------------
+ * ATMEL Microcontroller Software Support
+ * ----------------------------------------------------------------------------
+ * Copyright (c) 2008, Atmel Corporation
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * - Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the disclaimer below.
+ *
+ * Atmel's name may not be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * DISCLAIMER: THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
+ * DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
+ * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
+ * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ * ----------------------------------------------------------------------------
+ */
+
+//------------------------------------------------------------------------------
+// Headers
+//------------------------------------------------------------------------------
+
+#include "tsd.h"
+#include <board.h>
+#include <irq/irq.h>
+#include <pio/pio.h>
+#include <drivers/lcd/lcdd.h>
+#include <drivers/lcd/draw.h>
+#include <drivers/lcd/font.h>
+#include <drivers/lcd/color.h>
+#include <string.h>
+#include <utility/assert.h>
+
+//------------------------------------------------------------------------------
+// Local definitions
+//------------------------------------------------------------------------------
+
+/// Size in pixels of calibration points.
+#define POINTS_SIZE 4
+/// Maximum difference in pixels between the test point and the measured point.
+#define POINTS_MAX_ERROR 8
+
+/// Delay at the end of calibartion for result display (positive or negative)
+#define DELAY_RESULT_DISPLAY 4000000
+
+//------------------------------------------------------------------------------
+// Local types
+//------------------------------------------------------------------------------
+
+//------------------------------------------------------------------------------
+/// Point used during the touchscreen calibration process.
+//------------------------------------------------------------------------------
+typedef struct _CalibrationPoint {
+
+ /// Coordinate of point along the X-axis of the screen.
+ unsigned int x;
+ /// Coordinate of point along the Y-axis of the screen.
+ unsigned int y;
+ /// Calibration data of point.
+ unsigned int data[2];
+
+} CalibrationPoint;
+
+//------------------------------------------------------------------------------
+// Local variables
+//------------------------------------------------------------------------------
+
+/// indicates if the touch screen has been calibrated.
+/// If not, Callback functions are not called
+static volatile unsigned char bCalibrationOk = 0;
+/// Slope for interpoling touchscreen measurements along the X-axis.
+static signed int xSlope;
+/// Slope for interpoling touchscreen measurements along the Y-axis.
+static signed int ySlope;
+
+/// Calibration points
+static CalibrationPoint calibrationPoints[] = {
+
+ // Top-left corner calibration point
+ {
+ BOARD_LCD_WIDTH / 10,
+ BOARD_LCD_HEIGHT / 10,
+ {0, 0}
+ },
+ // Top-right corner calibration point
+ {
+ BOARD_LCD_WIDTH - BOARD_LCD_WIDTH / 10,
+ BOARD_LCD_HEIGHT / 10,
+ {0, 0}
+ },
+ // Bottom-right corner calibration point
+ {
+ BOARD_LCD_WIDTH - BOARD_LCD_WIDTH / 10,
+ BOARD_LCD_HEIGHT - BOARD_LCD_HEIGHT / 10,
+ {0, 0}
+ },
+ // Bottom-left corner calibration point
+ {
+ BOARD_LCD_WIDTH / 10,
+ BOARD_LCD_HEIGHT - BOARD_LCD_HEIGHT / 10,
+ {0, 0}
+ }
+};
+
+/// Test point
+static const CalibrationPoint testPoint = {
+ BOARD_LCD_WIDTH / 2,
+ BOARD_LCD_HEIGHT / 2,
+ {0, 0}
+};
+
+//------------------------------------------------------------------------------
+// External functions
+//------------------------------------------------------------------------------
+
+extern void TSD_GetRawMeasurement(unsigned int *pData);
+extern void TSD_WaitPenPressed(void);
+extern void TSD_WaitPenReleased(void);
+
+//------------------------------------------------------------------------------
+// Local functions
+//------------------------------------------------------------------------------
+
+//------------------------------------------------------------------------------
+/// Display a calibration point on the given buffer.
+/// \param pLcdBuffer LCD buffer to draw on.
+/// \param pPoint Calibration point to display.
+//------------------------------------------------------------------------------
+static void DrawCalibrationPoint(
+ void *pLcdBuffer,
+ const CalibrationPoint *pPoint)
+{
+ LCDD_DrawRectangle(pLcdBuffer,
+ pPoint->x - POINTS_SIZE / 2,
+ pPoint->y - POINTS_SIZE / 2,
+ POINTS_SIZE,
+ POINTS_SIZE,
+ COLOR_RED);
+}
+
+//------------------------------------------------------------------------------
+/// Clears a calibration point from the given buffer.
+/// \param pLcdBuffer LCD buffer to draw on.
+/// \param pPoint Calibration point to clear.
+//------------------------------------------------------------------------------
+static void ClearCalibrationPoint(
+ void *pLcdBuffer,
+ const CalibrationPoint *pPoint)
+{
+ LCDD_DrawRectangle(pLcdBuffer,
+ pPoint->x - POINTS_SIZE / 2,
+ pPoint->y - POINTS_SIZE / 2,
+ POINTS_SIZE,
+ POINTS_SIZE,
+ COLOR_WHITE);
+}
+
+//------------------------------------------------------------------------------
+// Global functions
+//------------------------------------------------------------------------------
+
+//------------------------------------------------------------------------------
+/// Indicates if the calibration of the touch screen is Ok
+/// \return 1 calibration Ok, 0 if not
+//------------------------------------------------------------------------------
+unsigned char TSDCom_IsCalibrationOk(void)
+{
+ if (bCalibrationOk == 1) {
+ return 1;
+ } else {
+ return 0;
+ }
+}
+
+//------------------------------------------------------------------------------
+/// Interpolates the provided raw measurements using the previously calculated
+/// slope. The resulting x and y coordinates are stored in an array.
+/// \param pData Raw measurement data, as returned by TSD_GetRawMeasurement().
+/// \param pPoint Array in which x and y will be stored.
+//------------------------------------------------------------------------------
+void TSDCom_InterpolateMeasurement(const unsigned int *pData, unsigned int *pPoint)
+{
+ pPoint[0] = calibrationPoints[0].x
+ - (((signed int) calibrationPoints[0].data[0] - (signed int) pData[0]) * 1024)
+ / xSlope;
+
+ pPoint[1] = calibrationPoints[0].y
+ - (((signed int) calibrationPoints[0].data[1] - (signed int) pData[1]) * 1024)
+ / ySlope;
+
+ if(pPoint[0] & 0x80000000) // Is pPoint[0] negative ?
+ {
+ pPoint[0] = 0;
+ }
+
+ if(pPoint[0] > BOARD_LCD_WIDTH) // Is pPoint[0] bigger than the LCD width ?
+ {
+ pPoint[0] = BOARD_LCD_WIDTH;
+ }
+
+ if(pPoint[1] & 0x80000000) // Is pPoint[1] negative ?
+ {
+ pPoint[1] = 0;
+ }
+
+ if(pPoint[1] > BOARD_LCD_HEIGHT) // Is pPoint[1] bigger than the LCD width ?
+ {
+ pPoint[1] = BOARD_LCD_HEIGHT;
+ }
+}
+
+//------------------------------------------------------------------------------
+/// Performs the calibration process using the provided buffer to display
+/// information.
+/// \param pLcdBuffer LCD buffer to display.
+/// \return True if calibration was successful; otherwise false.
+//------------------------------------------------------------------------------
+unsigned char TSDCom_Calibrate(void *pLcdBuffer)
+{
+#ifdef AT91C_ID_LCDC
+ void *pOldLcdBuffer;
+#endif
+ volatile unsigned int i; // to keep the tempo with gcc code optimisation
+ signed int slope1, slope2;
+ CalibrationPoint measuredPoint;
+ unsigned char xOk, yOk;
+ signed int xDiff, yDiff;
+
+ // Calibration setup
+ LCDD_Fill(pLcdBuffer, COLOR_WHITE);
+ LCDD_DrawString(pLcdBuffer, 30, 50, "LCD calibration", COLOR_BLACK);
+ LCDD_DrawString(pLcdBuffer, 1, 100, " Touch the dots to\ncalibrate the screen", COLOR_DARKBLUE);
+#ifdef AT91C_ID_LCDC
+ pOldLcdBuffer = LCDD_DisplayBuffer(pLcdBuffer);
+#endif
+
+ // Calibration points
+ for (i=0; i < 4; i++) {
+
+ DrawCalibrationPoint(pLcdBuffer, &calibrationPoints[i]);
+
+ // Wait for touch & end of conversion
+ TSD_WaitPenPressed();
+ TSD_GetRawMeasurement(calibrationPoints[i].data);
+ ClearCalibrationPoint(pLcdBuffer, &calibrationPoints[i]);
+
+ // Wait for contact loss
+ TSD_WaitPenReleased();
+ }
+
+ // Calculate slopes using the calibration data
+ // Theory behind those calculations:
+ // - We suppose the touchscreen measurements are linear, so the following equations are true (simple
+ // linear regression) for any two 'a' and 'b' points of the screen:
+ // dx = (a.data[0] - b.data[0]) / (a.x - b.x)
+ // dy = (a.data[1] - b.data[1]) / (a.y - b.y)
+ //
+ // - We calculate dx and dy (called xslope and yslope here) using the calibration points.
+ //
+ // - We can then use dx and dy to infer the position of a point 'p' given the measurements performed
+ // by the touchscreen ('c' is any of the calibration points):
+ // dx = (p.data[0] - c.data[0]) / (p.x - c.x)
+ // dy = (p.data[1] - c.data[1]) / (p.y - c.y)
+ // Thus:
+ // p.x = c.x - (p.data[0] - c.data[0]) / dx
+ // p.y = c.y - (p.data[1] - c.data[1]) / dy
+ //
+ // - Since there are four calibration points, dx and dy can be calculated twice, so we average
+ // the two values.
+ slope1 = ((signed int) calibrationPoints[0].data[0]) - ((signed int) calibrationPoints[1].data[0]);
+ slope1 *= 1024;
+ slope1 /= ((signed int) calibrationPoints[0].x) - ((signed int) calibrationPoints[1].x);
+ slope2 = ((signed int) calibrationPoints[2].data[0]) - ((signed int) calibrationPoints[3].data[0]);
+ slope2 *= 1024;
+ slope2 /= ((signed int) calibrationPoints[2].x) - ((signed int) calibrationPoints[3].x);
+ xSlope = (slope1 + slope2) / 2;
+
+ slope1 = ((signed int) calibrationPoints[0].data[1]) - ((signed int) calibrationPoints[2].data[1]);
+ slope1 *= 1024;
+ slope1 /= ((signed int) calibrationPoints[0].y) - ((signed int) calibrationPoints[2].y);
+ slope2 = ((signed int) calibrationPoints[1].data[1]) - ((signed int) calibrationPoints[3].data[1]);
+ slope2 *= 1024;
+ slope2 /= ((signed int) calibrationPoints[1].y) - ((signed int) calibrationPoints[3].y);
+ ySlope = (slope1 + slope2) / 2;
+
+ // Test point
+ LCDD_Fill(pLcdBuffer, 0xFFFFFF);
+ LCDD_DrawString(pLcdBuffer, 30, 50, "LCD calibration", COLOR_BLACK);
+ LCDD_DrawString(pLcdBuffer, 1, 100, " Touch the point to\nvalidate calibration", COLOR_DARKBLUE);
+ DrawCalibrationPoint(pLcdBuffer, &testPoint);
+
+ // Wait for touch & end of conversion
+ TSD_WaitPenPressed();
+
+ TSD_GetRawMeasurement(measuredPoint.data);
+ TSDCom_InterpolateMeasurement(measuredPoint.data, (unsigned int *) &measuredPoint);
+ DrawCalibrationPoint(pLcdBuffer, &measuredPoint);
+
+ // Check resulting x and y
+ xDiff = (signed int) measuredPoint.x - (signed int) testPoint.x;
+ yDiff = (signed int) measuredPoint.y - (signed int) testPoint.y;
+ xOk = (xDiff >= -POINTS_MAX_ERROR) && (xDiff <= POINTS_MAX_ERROR);
+ yOk = (yDiff >= -POINTS_MAX_ERROR) && (yDiff <= POINTS_MAX_ERROR);
+
+ // Wait for contact loss
+ TSD_WaitPenReleased();
+
+ // Check calibration result
+ if (xOk && yOk) {
+
+ bCalibrationOk = 1;
+ LCDD_Fill(pLcdBuffer, COLOR_WHITE);
+ LCDD_DrawString(pLcdBuffer, 30, 50, "LCD calibration", COLOR_BLACK);
+ LCDD_DrawString(pLcdBuffer, 80, 100, "Success !", COLOR_GREEN);
+
+ }
+ else {
+
+ bCalibrationOk = 0;
+ LCDD_Fill(pLcdBuffer, COLOR_WHITE);
+ LCDD_DrawString(pLcdBuffer, 30, 50, "LCD calibration", COLOR_BLACK);
+ LCDD_DrawString(pLcdBuffer, 40, 100, "Error too big", COLOR_RED);
+ }
+
+ // Slight delay
+ for (i = 0; i < DELAY_RESULT_DISPLAY; i++);
+
+#ifdef AT91C_ID_LCDC
+ // Restore old LCD buffer
+ LCDD_DisplayBuffer(pOldLcdBuffer);
+#endif
+
+ return (xOk && yOk);
+}
+
+//------------------------------------------------------------------------------
+/// Read calibrate data to buffer.
+/// \param pBuffer Data buffer.
+/// \param size Size of data buffer in bytes.
+//------------------------------------------------------------------------------
+void TSDCom_ReadCalibrateData(void *pBuffer, unsigned int size)
+{
+ unsigned char *pDest = (unsigned char *)pBuffer;
+
+ SANITY_CHECK((sizeof(bCalibrationOk) + sizeof(xSlope) +
+ sizeof(ySlope) + sizeof(calibrationPoints[0].data)) < size);
+
+ memcpy(pDest, (void const *)&bCalibrationOk, sizeof(bCalibrationOk));
+ pDest += sizeof(bCalibrationOk);
+ memcpy(pDest, &xSlope, sizeof(xSlope));
+ pDest += sizeof(xSlope);
+ memcpy(pDest, &ySlope, sizeof(ySlope));
+ pDest += sizeof(ySlope);
+ memcpy(pDest, &calibrationPoints[0].data, sizeof(calibrationPoints[0].data));
+ pDest += sizeof(calibrationPoints[0].data);
+}
+
+//------------------------------------------------------------------------------
+/// Restore calibrate data with buffer data.
+/// \param pBuffer Data buffer.
+/// \param size Size of data buffer in bytes.
+//------------------------------------------------------------------------------
+void TSDCom_RestoreCalibrateData(void *pBuffer, unsigned int size)
+{
+ unsigned char *pSrc = (unsigned char *)pBuffer;
+
+ SANITY_CHECK((sizeof(bCalibrationOk) + sizeof(xSlope) +
+ sizeof(ySlope) + sizeof(calibrationPoints[0].data)) < size);
+
+ memcpy((void *)&bCalibrationOk, pSrc, sizeof(bCalibrationOk));
+ pSrc += sizeof(bCalibrationOk);
+ memcpy(&xSlope, pSrc, sizeof(xSlope));
+ pSrc += sizeof(xSlope);
+ memcpy(&ySlope, pSrc, sizeof(ySlope));
+ pSrc += sizeof(ySlope);
+ memcpy(&calibrationPoints[0].data, pSrc, sizeof(calibrationPoints[0].data));
+ pSrc += sizeof(calibrationPoints[0].data);
+}
+
diff --git a/drivers/tsd/tsd_com.h b/drivers/tsd/tsd_com.h new file mode 100644 index 0000000..91e99c6 --- /dev/null +++ b/drivers/tsd/tsd_com.h @@ -0,0 +1,48 @@ +/* ----------------------------------------------------------------------------
+ * ATMEL Microcontroller Software Support
+ * ----------------------------------------------------------------------------
+ * Copyright (c) 2008, Atmel Corporation
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * - Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the disclaimer below.
+ *
+ * Atmel's name may not be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * DISCLAIMER: THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
+ * DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
+ * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
+ * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ * ----------------------------------------------------------------------------
+ */
+
+#ifndef TSD_COM_H
+#define TSD_COM_H
+
+//------------------------------------------------------------------------------
+// Global functions
+//------------------------------------------------------------------------------
+
+extern void TSDCom_InterpolateMeasurement(
+ const unsigned int *pData,
+ unsigned int *pPoint);
+
+unsigned char TSDCom_Calibrate(void *pLcdBuffer);
+
+unsigned char TSDCom_IsCalibrationOk(void);
+
+void TSDCom_ReadCalibrateData(void *pBuffer, unsigned int size);
+void TSDCom_RestoreCalibrateData(void *pBuffer, unsigned int size);
+
+#endif //#ifndef TSD_COM_H
diff --git a/drivers/tsd/tsd_tsadc.c b/drivers/tsd/tsd_tsadc.c new file mode 100644 index 0000000..bb9106a --- /dev/null +++ b/drivers/tsd/tsd_tsadc.c @@ -0,0 +1,269 @@ +/* ----------------------------------------------------------------------------
+ * ATMEL Microcontroller Software Support
+ * ----------------------------------------------------------------------------
+ * Copyright (c) 2008, Atmel Corporation
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * - Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the disclaimer below.
+ *
+ * Atmel's name may not be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * DISCLAIMER: THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
+ * DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
+ * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
+ * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ * ----------------------------------------------------------------------------
+ */
+
+//------------------------------------------------------------------------------
+// Headers
+//------------------------------------------------------------------------------
+
+#include <board.h>
+
+#ifdef AT91C_BASE_TSADC
+
+#include "tsd.h"
+#include "tsd_com.h"
+#include <irq/irq.h>
+#include <pio/pio.h>
+#include <tsadcc/tsadcc.h>
+#include <drivers/lcd/lcdd.h>
+#include <drivers/lcd/draw.h>
+#include <drivers/lcd/font.h>
+
+#include <string.h>
+
+//------------------------------------------------------------------------------
+// Local definitions
+//------------------------------------------------------------------------------
+
+//------------------------------------------------------------------------------
+// Local types
+//------------------------------------------------------------------------------
+
+//------------------------------------------------------------------------------
+// Local variables
+//------------------------------------------------------------------------------
+
+//------------------------------------------------------------------------------
+// External functions
+//------------------------------------------------------------------------------
+
+extern void TSD_PenPressed(unsigned int x, unsigned int y);
+extern void TSD_PenMoved(unsigned int x, unsigned int y);
+extern void TSD_PenReleased(unsigned int x, unsigned int y);
+
+//------------------------------------------------------------------------------
+// Local functions
+//------------------------------------------------------------------------------
+extern void TSD_GetRawMeasurement(unsigned int *pData);
+
+//------------------------------------------------------------------------------
+/// Interrupt handler for the TSADC. Handles pen press, pen move and pen release
+/// events by invoking three callback functions.
+//------------------------------------------------------------------------------
+static void InterruptHandler(void)
+{
+ unsigned int status;
+ unsigned int data[2];
+ static unsigned int newPoint[2];
+ static unsigned int point[2];
+ static unsigned char report = 0;
+
+ // Retrieve TADC status
+ // Bug fix: two step operation so IAR doesn't complain that the order of
+ // volatile access is unspecified.
+ status = AT91C_BASE_TSADC->TSADC_SR;
+ status &= AT91C_BASE_TSADC->TSADC_IMR;
+
+ // Pen release
+ if ((status & AT91C_TSADC_NOCNT) == AT91C_TSADC_NOCNT) {
+
+ // Invoke PenReleased callback
+ if(TSDCom_IsCalibrationOk()) {
+ TSD_PenReleased(point[0], point[1]);
+ }
+
+ // Stop periodic trigger mode
+ TSADCC_SetDebounceTime(BOARD_TOUCHSCREEN_DEBOUNCE);
+ AT91C_BASE_TSADC->TSADC_IDR = AT91C_TSADC_EOC3 | AT91C_TSADC_NOCNT;
+
+ TSADCC_SetTriggerMode(AT91C_TSADC_TRGMOD_PENDET_TRIGGER);
+ TSD_GetRawMeasurement(data); // Clear data registers
+ AT91C_BASE_TSADC->TSADC_SR;
+ AT91C_BASE_TSADC->TSADC_IER = AT91C_TSADC_PENCNT;
+ }
+ // Pen press
+ else if ((status & AT91C_TSADC_PENCNT) == AT91C_TSADC_PENCNT) {
+
+ // Invoke PenPressed callback with (x,y) coordinates
+ while ((AT91C_BASE_TSADC->TSADC_SR & AT91C_TSADC_EOC3) != AT91C_TSADC_EOC3);
+ TSD_GetRawMeasurement(data);
+ TSDCom_InterpolateMeasurement(data, point);
+
+ // Invoke PenPressed callback
+ if(TSDCom_IsCalibrationOk()) {
+ TSD_PenPressed(point[0], point[1]);
+ }
+
+ // Configure TSADC for periodic trigger
+ TSADCC_SetDebounceTime(10); // 1ns
+ AT91C_BASE_TSADC->TSADC_IER = AT91C_TSADC_EOC3 | AT91C_TSADC_NOCNT;
+ AT91C_BASE_TSADC->TSADC_IDR = AT91C_TSADC_PENCNT;
+ TSADCC_SetTriggerPeriod(10000000); // 10ms
+ TSADCC_SetTriggerMode(AT91C_TSADC_TRGMOD_PERIODIC_TRIGGER);
+ report = 0;
+ }
+ // Pen move
+ else if ((status & AT91C_TSADC_EOC3) == AT91C_TSADC_EOC3) {
+
+ // Invoke callback with LAST value measured
+ // Explanation: the very last value that will be measured (just as the
+ // pen is released) might be corrupted and there is no way to know. So
+ // we just discard it.
+
+ if (report) {
+
+ memcpy(point, newPoint, sizeof(newPoint));
+ // Invoke PenMoved callback
+ if(TSDCom_IsCalibrationOk()) {
+ TSD_PenMoved(point[0], point[1]);
+ }
+ report = 0;
+ }
+
+ TSD_GetRawMeasurement(data);
+ TSDCom_InterpolateMeasurement(data, newPoint);
+ if ((newPoint[0] != point[0]) || (newPoint[1] != point[1])) {
+
+ report = 1;
+ }
+ }
+}
+
+//------------------------------------------------------------------------------
+// Global functions
+//------------------------------------------------------------------------------
+
+//------------------------------------------------------------------------------
+/// Reads and store a touchscreen measurement in the provided array.
+/// The value stored are:
+/// - data[0] = CDR3 * 1024 / CDR2
+/// - data[1] = CDR1 * 1024 / CDR0
+/// \param pData Array where the measurements will be stored
+//------------------------------------------------------------------------------
+void TSD_GetRawMeasurement(unsigned int *pData)
+{
+ pData[0] = (AT91C_BASE_TSADC->TSADC_CDR3 * 1024);
+ pData[0] /= AT91C_BASE_TSADC->TSADC_CDR2;
+ pData[1] = (AT91C_BASE_TSADC->TSADC_CDR1 * 1024);
+ pData[1] /= AT91C_BASE_TSADC->TSADC_CDR0;
+}
+
+//------------------------------------------------------------------------------
+/// Wait pen pressed
+//------------------------------------------------------------------------------
+void TSD_WaitPenPressed(void)
+{
+ // Wait for touch & end of conversion
+ while ((AT91C_BASE_TSADC->TSADC_SR & AT91C_TSADC_PENCNT) != AT91C_TSADC_PENCNT);
+ while ((AT91C_BASE_TSADC->TSADC_SR & AT91C_TSADC_EOC3) != AT91C_TSADC_EOC3);
+}
+
+//------------------------------------------------------------------------------
+/// Wait pen released
+//------------------------------------------------------------------------------
+void TSD_WaitPenReleased(void)
+{
+ // Wait for contact loss
+ while ((AT91C_BASE_TSADC->TSADC_SR & AT91C_TSADC_NOCNT) != AT91C_TSADC_NOCNT);
+}
+
+//------------------------------------------------------------------------------
+/// Do calibration
+/// \param pLcdBuffer LCD buffer to use for displaying the calibration info.
+/// \return 1 if calibration is Ok, 0 else
+//------------------------------------------------------------------------------
+unsigned char TSD_Calibrate(void *pLcdBuffer)
+{
+ unsigned char ret = 0;
+
+ // Calibration is done only once
+ if(TSDCom_IsCalibrationOk()) {
+ return 1;
+ }
+
+ // Enable trigger
+ TSADCC_SetTriggerMode(AT91C_TSADC_TRGMOD_PENDET_TRIGGER);
+
+ // Do calibration
+ ret = TSDCom_Calibrate(pLcdBuffer);
+
+ // Disable trigger
+ TSADCC_SetTriggerMode(AT91C_TSADC_TRGMOD_NO_TRIGGER);
+
+ // Configure interrupt generation
+ // Do it only if the calibration is Ok.
+ if(ret) {
+ TSADCC_SetTriggerMode(AT91C_TSADC_TRGMOD_PENDET_TRIGGER);
+ IRQ_ConfigureIT(AT91C_ID_TSADC, 0, InterruptHandler);
+ IRQ_EnableIT(AT91C_ID_TSADC);
+ AT91C_BASE_TSADC->TSADC_IER = AT91C_TSADC_PENCNT;
+ }
+
+ return ret;
+}
+
+//------------------------------------------------------------------------------
+/// Initializes the touchscreen driver and starts the calibration process. When
+/// finished, the touchscreen is operational.
+/// The configuration is taken from the board.h of the device being compiled.
+///
+/// Important: the LCD driver must have been initialized prior to calling this
+/// function.
+/// \param pLcdBuffer LCD buffer to use for displaying the calibration info.
+//------------------------------------------------------------------------------
+void TSD_Initialize(void *pLcdBuffer)
+{
+ const Pin pins[] = {PINS_TSADCC};
+
+ // Configuration
+ AT91C_BASE_PMC->PMC_PCER = 1 << AT91C_ID_TSADC;
+ PIO_Configure(pins, PIO_LISTSIZE(pins));
+ TSADCC_SetOperatingMode(AT91C_TSADC_TSAMOD_TS_ONLY_MODE);
+ TSADCC_SetPenDetect(1);
+ TSADCC_SetAdcFrequency(BOARD_TOUCHSCREEN_ADCCLK, BOARD_MCK);
+ TSADCC_SetStartupTime(BOARD_TOUCHSCREEN_STARTUP);
+ TSADCC_SetTrackAndHoldTime(BOARD_TOUCHSCREEN_SHTIM);
+ TSADCC_SetDebounceTime(BOARD_TOUCHSCREEN_DEBOUNCE);
+
+ // Do calibration if the LCd buffer is not a null pointer
+ if(pLcdBuffer) {
+ // Calibration
+ while (!TSD_Calibrate(pLcdBuffer));
+ }
+}
+
+//------------------------------------------------------------------------------
+/// Reset/stop the touchscreen
+//------------------------------------------------------------------------------
+void TSD_Reset(void)
+{
+ IRQ_DisableIT(AT91C_ID_TSADC);
+ AT91C_BASE_PMC->PMC_PCDR = 1 << AT91C_ID_TSADC;
+}
+
+#endif //#ifdef AT91C_BASE_TSADC
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