75 lines
2.4 KiB
C
75 lines
2.4 KiB
C
/* SPI Potentiometer AD 7367 Driver for OpenPICC
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* (C) 2006 by Harald Welte <hwelte@hmw-consulting.de>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include <sys/types.h>
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#include <lib_AT91SAM7.h>
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#include "../openpcd.h"
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static const AT91PS_SPI spi = AT91C_BASE_SPI;
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void poti_comp_carr(uint8_t position)
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{
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volatile int i;
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while (!(spi->SPI_SR & AT91C_SPI_TDRE)) { }
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AT91F_PIO_ClearOutput(AT91C_BASE_PIOA, OPENPICC_PIO_SS2_DT_THRESH);
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/* shift one left, since it is a seven-bit value written as 8 bit xfer */
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spi->SPI_TDR = position & 0x7f;
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while (!(spi->SPI_SR & AT91C_SPI_TDRE)) { }
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for (i = 0; i < 0xff; i++) { }
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AT91F_PIO_SetOutput(AT91C_BASE_PIOA, OPENPICC_PIO_SS2_DT_THRESH);
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}
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void poti_reset(void)
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{
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volatile int i;
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AT91F_PIO_ClearOutput(AT91C_BASE_PIOA, OPENPICC_PIO_nSLAVE_RESET);
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for (i = 0; i < 0xff; i++) { }
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AT91F_PIO_SetOutput(AT91C_BASE_PIOA, OPENPICC_PIO_nSLAVE_RESET);
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}
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void poti_init(void)
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{
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AT91F_SPI_CfgPMC();
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AT91F_PIO_CfgPeriph(AT91C_BASE_PIOA,
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AT91C_PA13_MOSI | AT91C_PA14_SPCK, 0);
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AT91F_PIO_CfgOutput(AT91C_BASE_PIOA, OPENPICC_PIO_SS2_DT_THRESH);
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AT91F_PIO_SetOutput(AT91C_BASE_PIOA, OPENPICC_PIO_SS2_DT_THRESH);
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AT91F_PIO_CfgOutput(AT91C_BASE_PIOA, OPENPICC_PIO_nSLAVE_RESET);
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poti_reset();
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#if 0
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AT91F_AIC_ConfigureIt(AT91C_BASE_AIC, AT91C_ID_SPI,
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OPENPCD_IRQ_PRIO_SPI,
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AT91C_AIC_SRCTYPE_INT_HIGH_LEVEL, &spi_irq);
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AT91G_AIC_EnableIt(AT9C_BASE_AIC, AT91C_ID_SPI);
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#endif
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AT91F_SPI_CfgMode(spi, AT91C_SPI_MSTR |
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AT91C_SPI_PS_FIXED | AT91C_SPI_MODFDIS);
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/* CPOL = 0, NCPHA = 1, CSAAT = 0, BITS = 0000, SCBR = 13 (3.69MHz),
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* DLYBS = 6 (125nS), DLYBCT = 0 */
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AT91F_SPI_CfgCs(spi, 0, AT91C_SPI_BITS_8 | AT91C_SPI_NCPHA |
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(13 << 8) | (6 << 16));
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AT91F_SPI_Enable(spi);
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}
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