diff options
Diffstat (limited to 'drivers/tsd/tsd_ads7843.c')
| -rw-r--r-- | drivers/tsd/tsd_ads7843.c | 438 |
1 files changed, 438 insertions, 0 deletions
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
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