| 1 |
bb35dd01
|
(no author)
|
/* SPI Potentiometer AD 7367 Driver for OpenPICC
|
| 2 |
32985a29
|
laforge
|
* (C) 2006 by Harald Welte <hwelte@hmw-consulting.de>
|
| 3 |
|
|
*
|
| 4 |
|
|
* This program is free software; you can redistribute it and/or modify
|
| 5 |
|
|
* it under the terms of the GNU General Public License as published by
|
| 6 |
|
|
* the Free Software Foundation; either version 2 of the License, or
|
| 7 |
|
|
* (at your option) any later version.
|
| 8 |
|
|
*
|
| 9 |
|
|
* This program is distributed in the hope that it will be useful,
|
| 10 |
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
| 11 |
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
| 12 |
|
|
* GNU General Public License for more details.
|
| 13 |
|
|
*
|
| 14 |
|
|
* You should have received a copy of the GNU General Public License
|
| 15 |
|
|
* along with this program; if not, write to the Free Software
|
| 16 |
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
| 17 |
|
|
*
|
| 18 |
bb35dd01
|
(no author)
|
*/
|
| 19 |
|
|
|
| 20 |
32985a29
|
laforge
|
|
| 21 |
|
|
|
| 22 |
bb35dd01
|
(no author)
|
#include <sys/types.h>
|
| 23 |
|
|
#include <lib_AT91SAM7.h>
|
| 24 |
|
|
#include "../openpcd.h"
|
| 25 |
|
|
|
| 26 |
|
|
static const AT91PS_SPI spi = AT91C_BASE_SPI;
|
| 27 |
|
|
|
| 28 |
373c172a
|
Harald Welte
|
void poti_comp_carr(uint8_t position)
|
| 29 |
bb35dd01
|
(no author)
|
{
|
| 30 |
|
|
volatile int i;
|
| 31 |
|
|
|
| 32 |
|
|
while (!(spi->SPI_SR & AT91C_SPI_TDRE)) { }
|
| 33 |
|
|
AT91F_PIO_ClearOutput(AT91C_BASE_PIOA, OPENPICC_PIO_SS2_DT_THRESH);
|
| 34 |
|
|
/* shift one left, since it is a seven-bit value written as 8 bit xfer */
|
| 35 |
fbc2ed57
|
(no author)
|
spi->SPI_TDR = position & 0x7f;
|
| 36 |
bb35dd01
|
(no author)
|
while (!(spi->SPI_SR & AT91C_SPI_TDRE)) { }
|
| 37 |
|
|
for (i = 0; i < 0xff; i++) { }
|
| 38 |
|
|
AT91F_PIO_SetOutput(AT91C_BASE_PIOA, OPENPICC_PIO_SS2_DT_THRESH);
|
| 39 |
|
|
}
|
| 40 |
|
|
|
| 41 |
fbc2ed57
|
(no author)
|
void poti_reset(void)
|
| 42 |
|
|
{
|
| 43 |
|
|
volatile int i;
|
| 44 |
|
|
AT91F_PIO_ClearOutput(AT91C_BASE_PIOA, OPENPICC_PIO_nSLAVE_RESET);
|
| 45 |
|
|
for (i = 0; i < 0xff; i++) { }
|
| 46 |
|
|
AT91F_PIO_SetOutput(AT91C_BASE_PIOA, OPENPICC_PIO_nSLAVE_RESET);
|
| 47 |
|
|
}
|
| 48 |
|
|
|
| 49 |
bb35dd01
|
(no author)
|
void poti_init(void)
|
| 50 |
|
|
{
|
| 51 |
|
|
AT91F_SPI_CfgPMC();
|
| 52 |
2f7e1d31
|
(no author)
|
AT91F_PIO_CfgPeriph(AT91C_BASE_PIOA,
|
| 53 |
bb35dd01
|
(no author)
|
AT91C_PA13_MOSI | AT91C_PA14_SPCK, 0);
|
| 54 |
|
|
|
| 55 |
|
|
AT91F_PIO_CfgOutput(AT91C_BASE_PIOA, OPENPICC_PIO_SS2_DT_THRESH);
|
| 56 |
|
|
AT91F_PIO_SetOutput(AT91C_BASE_PIOA, OPENPICC_PIO_SS2_DT_THRESH);
|
| 57 |
fbc2ed57
|
(no author)
|
|
| 58 |
|
|
AT91F_PIO_CfgOutput(AT91C_BASE_PIOA, OPENPICC_PIO_nSLAVE_RESET);
|
| 59 |
|
|
poti_reset();
|
| 60 |
|
|
|
| 61 |
bb35dd01
|
(no author)
|
#if 0
|
| 62 |
|
|
AT91F_AIC_ConfigureIt(AT91C_BASE_AIC, AT91C_ID_SPI,
|
| 63 |
|
|
OPENPCD_IRQ_PRIO_SPI,
|
| 64 |
|
|
AT91C_AIC_SRCTYPE_INT_HIGH_LEVEL, &spi_irq);
|
| 65 |
|
|
AT91G_AIC_EnableIt(AT9C_BASE_AIC, AT91C_ID_SPI);
|
| 66 |
|
|
#endif
|
| 67 |
|
|
AT91F_SPI_CfgMode(spi, AT91C_SPI_MSTR |
|
| 68 |
|
|
AT91C_SPI_PS_FIXED | AT91C_SPI_MODFDIS);
|
| 69 |
fbc2ed57
|
(no author)
|
/* CPOL = 0, NCPHA = 1, CSAAT = 0, BITS = 0000, SCBR = 13 (3.69MHz),
|
| 70 |
|
|
* DLYBS = 6 (125nS), DLYBCT = 0 */
|
| 71 |
|
|
AT91F_SPI_CfgCs(spi, 0, AT91C_SPI_BITS_8 | AT91C_SPI_NCPHA |
|
| 72 |
|
|
(13 << 8) | (6 << 16));
|
| 73 |
bb35dd01
|
(no author)
|
AT91F_SPI_Enable(spi);
|
| 74 |
|
|
}
|
