From bb35dd012651e6af069ef0fa549f4abfd533acb0 Mon Sep 17 00:00:00 2001
From: "(no author)" <(no author)@6dc7ffe9-61d6-0310-9af1-9938baff3ed1>
Date: Sun, 10 Sep 2006 00:02:46 +0000
Subject: Commit code to drive SPI Potentiometers

git-svn-id: https://svn.openpcd.org:2342/trunk@163 6dc7ffe9-61d6-0310-9af1-9938baff3ed1
---
 openpcd/firmware/Makefile        |  2 +-
 openpcd/firmware/src/picc/poti.c | 45 ++++++++++++++++++++++++++++++++++++++++
 openpcd/firmware/src/picc/poti.h |  7 +++++++
 3 files changed, 53 insertions(+), 1 deletion(-)
 create mode 100644 openpcd/firmware/src/picc/poti.c
 create mode 100644 openpcd/firmware/src/picc/poti.h

(limited to 'openpcd')

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
-- 
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