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Makefile with libs and atmel source
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Christina Quast
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/* ----------------------------------------------------------------------------
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* ATMEL Microcontroller Software Support
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* ----------------------------------------------------------------------------
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* Copyright (c) 2009, Atmel Corporation
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*
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* - Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the disclaimer below.
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*
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* Atmel's name may not be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* DISCLAIMER: THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
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* DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
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* OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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* ----------------------------------------------------------------------------
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*/
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/**
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* \file
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*
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* Implementation of ADS7843 driver.
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*
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*/
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/*----------------------------------------------------------------------------
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* Headers
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*----------------------------------------------------------------------------*/
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#include "board.h"
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/*----------------------------------------------------------------------------
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* Definitions
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*----------------------------------------------------------------------------*/
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#define ADS_CTRL_PD0 (1 << 0) /* PD0 */
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#define ADS_CTRL_PD1 (1 << 1) /* PD1 */
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#define ADS_CTRL_DFR (1 << 2) /* SER/DFR */
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#define ADS_CTRL_EIGHT_BITS_MOD (1 << 3) /* Mode */
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#define ADS_CTRL_START (1 << 7) /* Start Bit */
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#define ADS_CTRL_SWITCH_SHIFT 4 /* Address setting */
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/* Get X position command */
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#define CMD_Y_POSITION ((1 << ADS_CTRL_SWITCH_SHIFT) | ADS_CTRL_START | ADS_CTRL_PD0 | ADS_CTRL_PD1)
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/* Get Y position command */
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#define CMD_X_POSITION ((5 << ADS_CTRL_SWITCH_SHIFT) | ADS_CTRL_START | ADS_CTRL_PD0 | ADS_CTRL_PD1)
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/* Enable penIRQ */
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#define CMD_ENABLE_PENIRQ ((1 << ADS_CTRL_SWITCH_SHIFT) | ADS_CTRL_START)
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#define ADS7843_TIMEOUT 5000000
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#define DELAY_BEFORE_SPCK 200 /* 2us min (tCSS) <=> 200/100 000 000 = 2us */
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#define DELAY_BETWEEN_CONS_COM 0xf /* 5us min (tCSH) <=> (32 * 15) / (100 000 000) = 5us */
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/*----------------------------------------------------------------------------
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* Local variables
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*----------------------------------------------------------------------------*/
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/** Pins used by SPI */
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static const Pin pinsSPI[] = {BOARD_TSC_SPI_PINS, BOARD_TSC_NPCS_PIN};
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/** Touch screen BUSY pin */
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static const Pin pinBusy[] = {PIN_TSC_BUSY};
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/*----------------------------------------------------------------------------
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* Local functions
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*----------------------------------------------------------------------------*/
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/**
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* \brief Generic function to send a command to the touchscreen controller.
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*
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* \param bCmd command to send
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*
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* \return command result
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*/
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static uint32_t SendCommand( uint8_t bCmd )
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{
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uint32_t uResult = 0;
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uint32_t uTimeout = 0;
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/* (volatile declaration needed for code optimisation by compiler) */
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volatile uint8_t bufferRX[3];
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volatile uint8_t bufferTX[3];
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Pdc *pPdc = (Pdc *)SPI;
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uint32_t dStatus;
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bufferRX[0] = 0;
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bufferRX[1] = 0;
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bufferRX[2] = 0;
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bufferTX[0] = bCmd;
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bufferTX[1] = 0;
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bufferTX[2] = 0;
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/* Send Command and data through the SPI */
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pPdc->PERIPH_PTCR = PERIPH_PTCR_RXTDIS;
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pPdc->PERIPH_RPR = (uint32_t) bufferRX;
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pPdc->PERIPH_RCR = 3;
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pPdc->PERIPH_PTCR = PERIPH_PTCR_TXTDIS;
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pPdc->PERIPH_TPR = (uint32_t) bufferTX;
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pPdc->PERIPH_TCR = 3;
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pPdc->PERIPH_PTCR = PERIPH_PTCR_RXTEN;
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pPdc->PERIPH_PTCR = PERIPH_PTCR_TXTEN;
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do
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{
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dStatus = REG_SPI_SR;
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uTimeout++;
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}
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while ((( dStatus & SPI_SR_RXBUFF) != SPI_SR_RXBUFF) && (uTimeout < ADS7843_TIMEOUT));
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pPdc->PERIPH_PTCR = PERIPH_PTCR_RXTDIS;
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pPdc->PERIPH_PTCR = PERIPH_PTCR_TXTDIS;
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uResult = (uint32_t)bufferRX[1] << 8;
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uResult |= (uint32_t)bufferRX[2];
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uResult = uResult >> 4;
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return uResult;
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}
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/*----------------------------------------------------------------------------
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* Exported functions
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*----------------------------------------------------------------------------*/
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/**
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* \brief Get position of the pen by ask the ADS controller (SPI).
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*
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* \param px_pos pointer to the horizontal position
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* \param py_pos pointer to the vertical position
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*
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*/
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extern void ADS7843_GetPosition( uint32_t *px_pos, uint32_t *py_pos )
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{
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/* Get X position */
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*px_pos = SendCommand(CMD_X_POSITION);
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/* Get Y position */
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*py_pos = SendCommand(CMD_Y_POSITION);
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/* Switch to full power mode */
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SendCommand(CMD_ENABLE_PENIRQ);
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}
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/**
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* \brief Initialization of the SPI for communication with ADS7843 component.
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*/
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extern void ADS7843_Initialize( void )
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{
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volatile uint32_t uDummy;
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/* Configure pins */
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PIO_Configure(pinsSPI, PIO_LISTSIZE(pinsSPI));
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PIO_Configure(pinBusy, PIO_LISTSIZE(pinBusy));
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SPI_Configure(BOARD_TSC_SPI_BASE,
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BOARD_TSC_SPI_ID,
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SPI_MR_MSTR | SPI_MR_MODFDIS | SPI_PCS(BOARD_TSC_NPCS) /* Value of the SPI configuration register. */
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);
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SPI_ConfigureNPCS(BOARD_TSC_SPI_BASE, BOARD_TSC_NPCS,
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SPI_CSR_NCPHA | SPI_CSR_DLYBS(DELAY_BEFORE_SPCK) |
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SPI_CSR_DLYBCT(DELAY_BETWEEN_CONS_COM) | SPI_CSR_SCBR(0xC8) );
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SPI_Enable(BOARD_TSC_SPI_BASE);
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for (uDummy=0; uDummy<100000; uDummy++);
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uDummy = REG_SPI_SR;
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uDummy = REG_SPI_RDR;
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SendCommand(CMD_ENABLE_PENIRQ);
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}
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/**
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* \brief Reset the ADS7843
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*/
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void ADS7843_Reset( void )
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{
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/* Disable SPI */
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SPI_Disable( BOARD_TSC_SPI_BASE ) ;
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}
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