diff options
| author | (no author) <(no author)@6dc7ffe9-61d6-0310-9af1-9938baff3ed1> | 2006-09-10 00:02:46 +0000 |
|---|---|---|
| committer | (no author) <(no author)@6dc7ffe9-61d6-0310-9af1-9938baff3ed1> | 2006-09-10 00:02:46 +0000 |
| commit | bb35dd012651e6af069ef0fa549f4abfd533acb0 (patch) | |
| tree | 17bfaada42e2e957f7bbed9b9cb5123adbd5f11c | |
| parent | 4cceea07ca0b48ecab07a22c5819e3982dbfbe37 (diff) | |
Commit code to drive SPI Potentiometers
git-svn-id: https://svn.openpcd.org:2342/trunk@163 6dc7ffe9-61d6-0310-9af1-9938baff3ed1
| -rw-r--r-- | openpcd/firmware/Makefile | 2 | ||||
| -rw-r--r-- | openpcd/firmware/src/picc/poti.c | 45 | ||||
| -rw-r--r-- | openpcd/firmware/src/picc/poti.h | 7 |
3 files changed, 53 insertions, 1 deletions
diff --git a/openpcd/firmware/Makefile b/openpcd/firmware/Makefile index 1101495..4bb05dc 100644 --- a/openpcd/firmware/Makefile +++ b/openpcd/firmware/Makefile @@ -99,7 +99,7 @@ else # PICC support code SRCARM += src/picc/tc_fdt.c src/picc/ssc_picc.c src/picc/adc.c \ src/picc/decoder.c src/picc/decoder_miller.c \ - src/picc/decoder_nrzl.c + src/picc/decoder_nrzl.c src/picc/poti.c # finally, the actual main application SRCARM += src/picc/$(TARGET).c endif diff --git a/openpcd/firmware/src/picc/poti.c b/openpcd/firmware/src/picc/poti.c new file mode 100644 index 0000000..55691ba --- /dev/null +++ b/openpcd/firmware/src/picc/poti.c @@ -0,0 +1,45 @@ +/* SPI Potentiometer AD 7367 Driver for OpenPICC + * (C) by Harald Welte <hwelte@hmw-consulting.de> + */ + +#include <sys/types.h> +#include <lib_AT91SAM7.h> +#include "../openpcd.h" + +static const AT91PS_SPI spi = AT91C_BASE_SPI; + +void poti_comp_carr(u_int8_t position) +{ + volatile int i; + + while (!(spi->SPI_SR & AT91C_SPI_TDRE)) { } + AT91F_PIO_ClearOutput(AT91C_BASE_PIOA, OPENPICC_PIO_SS2_DT_THRESH); + for (i = 0; i < 0xff; i++) { } + /* shift one left, since it is a seven-bit value written as 8 bit xfer */ + spi->SPI_TDR = position; + while (!(spi->SPI_SR & AT91C_SPI_TDRE)) { } + for (i = 0; i < 0xff; i++) { } + AT91F_PIO_SetOutput(AT91C_BASE_PIOA, OPENPICC_PIO_SS2_DT_THRESH); +} + +void poti_init(void) +{ + AT91F_SPI_CfgPMC(); + AT91F_PIO_CfgPeriph(AT91C_BASE_PIOA, AT91C_PA12_MISO | + AT91C_PA13_MOSI | AT91C_PA14_SPCK, 0); + + AT91F_PIO_CfgOutput(AT91C_BASE_PIOA, OPENPICC_PIO_SS2_DT_THRESH); + AT91F_PIO_SetOutput(AT91C_BASE_PIOA, OPENPICC_PIO_SS2_DT_THRESH); +#if 0 + AT91F_AIC_ConfigureIt(AT91C_BASE_AIC, AT91C_ID_SPI, + OPENPCD_IRQ_PRIO_SPI, + AT91C_AIC_SRCTYPE_INT_HIGH_LEVEL, &spi_irq); + AT91G_AIC_EnableIt(AT9C_BASE_AIC, AT91C_ID_SPI); +#endif + AT91F_SPI_CfgMode(spi, AT91C_SPI_MSTR | + AT91C_SPI_PS_FIXED | AT91C_SPI_MODFDIS); + /* CPOL = 0, NCPHA = 1, CSAAT = 0, BITS = 0000, SCBR = 12 (4MHz), + * DLYBS = 0, DLYBCT = 0 */ + AT91F_SPI_CfgCs(spi, 0, AT91C_SPI_BITS_8 | AT91C_SPI_NCPHA | (24<<8)); + AT91F_SPI_Enable(spi); +} diff --git a/openpcd/firmware/src/picc/poti.h b/openpcd/firmware/src/picc/poti.h new file mode 100644 index 0000000..92ec00d --- /dev/null +++ b/openpcd/firmware/src/picc/poti.h @@ -0,0 +1,7 @@ +#ifndef _POTI_H +#define _POTI_H + +extern void poti_comp_carr(u_int8_t position); +extern void poti_init(void); + +#endif |