diff options
Diffstat (limited to 'drivers/tsd/tsd_tsadc.c')
| -rw-r--r-- | drivers/tsd/tsd_tsadc.c | 269 |
1 files changed, 269 insertions, 0 deletions
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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