diff options
Diffstat (limited to 'components/ads7843')
| -rw-r--r-- | components/ads7843/ads7843.c | 264 | ||||
| -rw-r--r-- | components/ads7843/ads7843.dir | 41 | ||||
| -rw-r--r-- | components/ads7843/ads7843.h | 69 |
3 files changed, 374 insertions, 0 deletions
diff --git a/components/ads7843/ads7843.c b/components/ads7843/ads7843.c new file mode 100644 index 0000000..9ef1f17 --- /dev/null +++ b/components/ads7843/ads7843.c @@ -0,0 +1,264 @@ +/* ----------------------------------------------------------------------------
+ * 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
+///
+/// ADS7843 driver
+///
+/// !Usage
+///
+/// Explanation on the usage of the code made available through the header file.
+//------------------------------------------------------------------------------
+
+//------------------------------------------------------------------------------
+// Headers
+//------------------------------------------------------------------------------
+#include <board.h>
+
+#ifdef BOARD_TSC_ADS7843
+
+#include <pio/pio.h>
+#include <spi/spi.h>
+
+#include "ads7843.h"
+
+//------------------------------------------------------------------------------
+// Defines
+//------------------------------------------------------------------------------
+
+#define ADS_CTRL_PD0 (1 << 0) // PD0
+#define ADS_CTRL_PD1 (1 << 1) // PD1
+#define ADS_CTRL_DFR (1 << 2) // SER/DFR
+#define ADS_CTRL_EIGHT_BITS_MOD (1 << 3) // Mode
+#define ADS_CTRL_START (1 << 7) // Start Bit
+#define ADS_CTRL_SWITCH_SHIFT 4 // Address setting
+
+#if defined(cortexm3)
+// Get X position command
+#define CMD_Y_POSITION ((1 << ADS_CTRL_SWITCH_SHIFT) | ADS_CTRL_START | ADS_CTRL_PD0 | ADS_CTRL_PD1)
+// Get Y position command
+#define CMD_X_POSITION ((5 << ADS_CTRL_SWITCH_SHIFT) | ADS_CTRL_START | ADS_CTRL_PD0 | ADS_CTRL_PD1)
+#else
+// Get X position command
+#define CMD_X_POSITION ((1 << ADS_CTRL_SWITCH_SHIFT) | ADS_CTRL_START | ADS_CTRL_PD0 | ADS_CTRL_PD1)
+// Get Y position command
+#define CMD_Y_POSITION ((5 << ADS_CTRL_SWITCH_SHIFT) | ADS_CTRL_START | ADS_CTRL_PD0 | ADS_CTRL_PD1)
+#endif
+
+// Enable penIRQ
+#define CMD_ENABLE_PENIRQ ((1 << ADS_CTRL_SWITCH_SHIFT) | ADS_CTRL_START)
+
+
+#define AT91C_TOUCHSCREEN_TIMEOUT 5000000
+
+#define DELAY_BEFORE_SPCK (200 << 16) // 2us min (tCSS) <=> 200/100 000 000 = 2us
+#define DELAY_BETWEEN_CONS_COM (0xf << 24) // 5us min (tCSH) <=> (32 * 15) / (100 000 000) = 5us
+
+//------------------------------------------------------------------------------
+// Local variables
+//------------------------------------------------------------------------------
+
+/// Pins used by SPI
+static const Pin pinsSPI[] = {BOARD_TSC_SPI_PINS, BOARD_TSC_NPCS_PIN};
+
+/// Touch screen BUSY pin
+static const Pin pinBusy[] = {PIN_TCS_BUSY};
+/// Touch screen CS pin
+static const Pin pinNss[] = {BOARD_TSC_NPCS_PIN};
+
+//------------------------------------------------------------------------------
+// Local functions
+//------------------------------------------------------------------------------
+
+//-----------------------------------------------------------------------------
+/// Generic function to send a command to the touchscreen controller
+/// \param bCmd command to send
+/// \return command result
+//-----------------------------------------------------------------------------
+static unsigned int SendCommand(unsigned char bCmd)
+{
+#if defined(cortexm3)
+ int i;
+ AT91S_SPI *spi = BOARD_TSC_SPI_BASE;
+ unsigned int uResult = 0;
+ // (volatile declaration needed for code optimisation by compiler)
+ volatile unsigned char bufferRX[3];
+ volatile unsigned char bufferTX[3];
+
+ bufferRX[0] = 0;
+ bufferRX[1] = 0;
+ bufferRX[2] = 0;
+
+ bufferTX[0] = bCmd;
+ bufferTX[1] = 0;
+ bufferTX[2] = 0;
+
+ // Send command
+ i = 0;
+ while ((spi->SPI_SR & AT91C_SPI_TXEMPTY) == 0);
+ spi->SPI_TDR = bufferTX[i] | SPI_PCS(BOARD_TSC_NPCS);
+ while ((spi->SPI_SR & AT91C_SPI_TDRE) == 0);
+
+ while (PIO_Get(pinBusy) == 1);
+ while ((spi->SPI_SR & AT91C_SPI_RDRF) == 0);
+ bufferRX[i] = spi->SPI_RDR & 0xFFFF;
+
+ // Read data
+ for (i = 1; i < 3; i++) {
+
+ while ((spi->SPI_SR & AT91C_SPI_TXEMPTY) == 0);
+ spi->SPI_TDR = bufferTX[i] | SPI_PCS(BOARD_TSC_NPCS);
+ while ((spi->SPI_SR & AT91C_SPI_TDRE) == 0);
+
+ while ((spi->SPI_SR & AT91C_SPI_RDRF) == 0);
+ bufferRX[i] = spi->SPI_RDR & 0xFFFF;
+ }
+
+ uResult = ((unsigned int)bufferRX[1] << 8) | (unsigned int)bufferRX[2];
+ uResult = uResult >> 4;
+
+ return uResult;
+
+#else // AT91SAM7, SAM9
+
+ unsigned int uResult = 0;
+ unsigned int uTimeout = 0;
+ // (volatile declaration needed for code optimisation by compiler)
+ volatile unsigned char bufferRX[3];
+ volatile unsigned char bufferTX[3];
+
+ AT91PS_PDC pPdc = (AT91PS_PDC) &(AT91C_BASE_SPI0->SPI_RPR);
+ unsigned int dStatus;
+
+ bufferRX[0] = 0;
+ bufferRX[1] = 0;
+ bufferRX[2] = 0;
+
+ bufferTX[0] = bCmd;
+ bufferTX[1] = 0;
+ bufferTX[2] = 0;//bCmd;
+
+ // Send Command and data through the SPI
+ pPdc->PDC_PTCR = AT91C_PDC_RXTDIS;
+ pPdc->PDC_RPR = (unsigned int) bufferRX;
+ pPdc->PDC_RCR = 3;
+
+ pPdc->PDC_PTCR = AT91C_PDC_TXTDIS;
+ pPdc->PDC_TPR = (unsigned int) bufferTX;
+ pPdc->PDC_TCR = 3;
+
+ pPdc->PDC_PTCR = AT91C_PDC_RXTEN;
+ pPdc->PDC_PTCR = AT91C_PDC_TXTEN;
+
+ do {
+ dStatus = AT91C_BASE_SPI0->SPI_SR;
+ uTimeout++;
+ }
+ while ((( dStatus & AT91C_SPI_RXBUFF) != AT91C_SPI_RXBUFF) && (uTimeout < AT91C_TOUCHSCREEN_TIMEOUT));
+
+ pPdc->PDC_PTCR = AT91C_PDC_RXTDIS;
+ pPdc->PDC_PTCR = AT91C_PDC_TXTDIS;
+
+ uResult = ((unsigned int)bufferRX[1] << 8) | (unsigned int)bufferRX[2];
+ uResult = uResult >> 4;
+
+ return uResult;
+#endif
+}
+
+//------------------------------------------------------------------------------
+// Global functions
+//------------------------------------------------------------------------------
+
+//-----------------------------------------------------------------------------
+/// Get position of the pen by ask the ADS controller (SPI)
+/// \param px_pos pointer to the horizontal position
+/// \param py_pos pointer to the vertical position
+//-----------------------------------------------------------------------------
+void ADS7843_GetPosition(unsigned int* px_pos, unsigned int* py_pos)
+{
+ // Get X position
+ *px_pos = SendCommand(CMD_X_POSITION);
+ // Get Y position
+ *py_pos = SendCommand(CMD_Y_POSITION);
+ // Switch to full power mode
+ SendCommand(CMD_ENABLE_PENIRQ);
+}
+
+
+//-----------------------------------------------------------------------------
+/// Initialization of the SPI for communication with ADS7843 component
+//-----------------------------------------------------------------------------
+void ADS7843_Initialize(void)
+{
+ volatile unsigned int uDummy;
+
+ // Configure pins
+ PIO_Configure(pinsSPI, PIO_LISTSIZE(pinsSPI));
+
+ PIO_Configure(pinBusy, PIO_LISTSIZE(pinBusy));
+
+ SPI_Configure(AT91C_BASE_SPI0,
+ AT91C_ID_SPI0,
+ AT91C_SPI_MSTR | AT91C_SPI_MODFDIS | SPI_PCS(BOARD_TSC_NPCS) // Value of the SPI configuration register.
+ );
+
+#if defined(cortexm3)
+ SPI_ConfigureNPCS(AT91C_BASE_SPI0, BOARD_TSC_NPCS,
+ AT91C_SPI_NCPHA | (AT91C_SPI_DLYBS & DELAY_BEFORE_SPCK) | AT91C_SPI_CSAAT |
+ (AT91C_SPI_DLYBCT & DELAY_BETWEEN_CONS_COM) | (0xC8 << 8) );
+#else // AT91SAM7, SAM9
+ SPI_ConfigureNPCS(AT91C_BASE_SPI0, BOARD_TSC_NPCS,
+ AT91C_SPI_NCPHA | (AT91C_SPI_DLYBS & DELAY_BEFORE_SPCK) |
+ (AT91C_SPI_DLYBCT & DELAY_BETWEEN_CONS_COM) | (0xC8 << 8) );
+#endif
+
+ SPI_Enable(AT91C_BASE_SPI0);
+
+ for (uDummy=0; uDummy<100000; uDummy++);
+
+ uDummy = AT91C_BASE_SPI0->SPI_SR;
+ uDummy = AT91C_BASE_SPI0->SPI_RDR;
+
+ SendCommand(CMD_ENABLE_PENIRQ);
+}
+
+//-----------------------------------------------------------------------------
+/// Reset the ADS7843
+//-----------------------------------------------------------------------------
+void ADS7843_Reset(void)
+{
+ // Disable SPI 0
+ SPI_Disable(AT91C_BASE_SPI0);
+}
+
+#endif //#ifdef BOARD_TSC_ADS7843
diff --git a/components/ads7843/ads7843.dir b/components/ads7843/ads7843.dir new file mode 100644 index 0000000..c065103 --- /dev/null +++ b/components/ads7843/ads7843.dir @@ -0,0 +1,41 @@ +/* ----------------------------------------------------------------------------
+ * 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
+///
+/// !!!Purpose
+///
+/// This directory contains APIs for ADS7843.
+///
+/// !!!Contents
+///
+/// - ads7843.h api definition for ADS7843.
+/// - ads7843.c driver for ADS7843.
+//------------------------------------------------------------------------------
diff --git a/components/ads7843/ads7843.h b/components/ads7843/ads7843.h new file mode 100644 index 0000000..4cdcdfa --- /dev/null +++ b/components/ads7843/ads7843.h @@ -0,0 +1,69 @@ +/* ----------------------------------------------------------------------------
+ * 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
+///
+/// Definition of methods for ADS7843 driver.
+///
+/// !!!Usage
+///
+/// -# ADS7843_Initialize
+/// -# ADS7843_Reset
+/// -# ADS7843_GetPosition
+//------------------------------------------------------------------------------
+
+#ifndef ADS7843_H
+#define ADS7843_H
+
+//------------------------------------------------------------------------------
+// Headers
+//------------------------------------------------------------------------------
+#include <board.h>
+
+#ifdef BOARD_TSC_ADS7843
+
+//------------------------------------------------------------------------------
+// Constants
+//------------------------------------------------------------------------------
+
+//------------------------------------------------------------------------------
+// Global functions
+//------------------------------------------------------------------------------
+
+extern void ADS7843_Initialize(void);
+
+extern void ADS7843_Reset(void);
+
+extern void ADS7843_GetPosition(unsigned int* px_pos, unsigned int* py_pos);
+
+#endif //#ifdef BOARD_TSC_ADS7843
+#endif //#ifndef ADS7843_H
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