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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
commitbb35dd012651e6af069ef0fa549f4abfd533acb0 (patch)
tree17bfaada42e2e957f7bbed9b9cb5123adbd5f11c /openpcd
parent4cceea07ca0b48ecab07a22c5819e3982dbfbe37 (diff)
Commit code to drive SPI Potentiometers
git-svn-id: https://svn.openpcd.org:2342/trunk@163 6dc7ffe9-61d6-0310-9af1-9938baff3ed1
Diffstat (limited to 'openpcd')
-rw-r--r--openpcd/firmware/Makefile2
-rw-r--r--openpcd/firmware/src/picc/poti.c45
-rw-r--r--openpcd/firmware/src/picc/poti.h7
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