From 044ad7c3987460ede48ff27afd6bdb0ca05a0432 Mon Sep 17 00:00:00 2001 From: Harald Welte Date: Mon, 4 Jul 2011 20:52:54 +0200 Subject: import at91lib from at91lib_20100901_softpack_1_9_v_1_0_svn_v15011 it's sad to see that atmel doesn't publish their svn repo or has a centralized location or even puts proper version/release info into the library itself --- drivers/tsd/tsd_tsadc.c | 269 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 269 insertions(+) create mode 100644 drivers/tsd/tsd_tsadc.c (limited to 'drivers/tsd/tsd_tsadc.c') 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 + +#ifdef AT91C_BASE_TSADC + +#include "tsd.h" +#include "tsd_com.h" +#include +#include +#include +#include +#include +#include + +#include + +//------------------------------------------------------------------------------ +// 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 -- cgit v1.2.3