From e40b7f1ecfc7be6267192d54b0650960dda84d6d Mon Sep 17 00:00:00 2001
From: bernie <bernie@38d2e660-2303-0410-9eaa-f027e97ec537>
Date: Wed, 13 Sep 2006 18:21:24 +0000
Subject: [PATCH 1/1] Add configurable SPI pin mapping.

git-svn-id: https://src.develer.com/svnoss/bertos/trunk@682 38d2e660-2303-0410-9eaa-f027e97ec537
---
 drv/ser.h     | 10 ++++++++
 drv/ser_avr.c | 64 +++++++++++++++++++++++++++++++++++++++++++++++----
 2 files changed, 69 insertions(+), 5 deletions(-)

diff --git a/drv/ser.h b/drv/ser.h
index edc924d2..27f022cd 100755
--- a/drv/ser.h
+++ b/drv/ser.h
@@ -14,6 +14,9 @@
 
 /*#*
  *#* $Log$
+ *#* Revision 1.30  2006/09/13 18:21:23  bernie
+ *#* Add configurable SPI pin mapping.
+ *#*
  *#* Revision 1.29  2006/09/13 13:59:11  bernie
  *#* Documentation fixes.
  *#*
@@ -175,6 +178,13 @@
 #define SERRF_TX  (SERRF_TXTIMEOUT)
 /*\}*/
 
+/** LSB or MSB first data order, used with SPI AVR serial */
+ * \name LSB or MSB first data order, used with SPI AVR serial
+ * \{
+ */
+#define SER_MSB_FIRST 0
+#define SER_LSB_FIRST 1
+/*\}*/
 
 /**
  * \name Parity settings for ser_setparity().
diff --git a/drv/ser_avr.c b/drv/ser_avr.c
index dba54b0c..02a3427e 100755
--- a/drv/ser_avr.c
+++ b/drv/ser_avr.c
@@ -38,6 +38,9 @@
 
 /*#*
  *#* $Log$
+ *#* Revision 1.33  2006/09/13 18:21:24  bernie
+ *#* Add configurable SPI pin mapping.
+ *#*
  *#* Revision 1.32  2006/07/19 12:56:26  bernie
  *#* Convert to new Doxygen style.
  *#*
@@ -306,12 +309,14 @@
 #if CPU_AVR_ATMEGA64 || CPU_AVR_ATMEGA128 || CPU_AVR_ATMEGA103
 	#define SPI_PORT      PORTB
 	#define SPI_DDR       DDRB
+	#define SPI_SS_BIT    PB0
 	#define SPI_SCK_BIT   PB1
 	#define SPI_MOSI_BIT  PB2
 	#define SPI_MISO_BIT  PB3
 #elif CPU_AVR_ATMEGA8
 	#define SPI_PORT      PORTB
 	#define SPI_DDR       DDRB
+	#define SPI_SS_BIT    PB2
 	#define SPI_SCK_BIT   PB5
 	#define SPI_MOSI_BIT  PB3
 	#define SPI_MISO_BIT  PB4
@@ -535,11 +540,60 @@ static void spi_init(UNUSED_ARG(struct SerialHardware *, _hw), UNUSED_ARG(struct
 	 * with the KBus serial RX, and the transmitter of the slave boards
 	 * would be unable to drive the line.
 	 */
-	SPI_DDR |= BV(SPI_MOSI_BIT) | BV(SPI_SCK_BIT);
-	SPI_DDR &= ~BV(SPI_MISO_BIT);
-	/* Enable SPI, IRQ on, Master, CPU_CLOCK/16 */
-	SPCR = BV(SPE) | BV(SPIE) | BV(MSTR) | BV(SPR0);
+	ATOMIC(SPI_DDR |= (BV(SPI_MOSI_BIT) | BV(SPI_SCK_BIT)));
+
+	/*
+	 * If the SPI master mode is activated and the SS pin is in input and tied low,
+	 * the SPI hardware will automatically switch to slave mode!
+	 * For proper communication this pins should therefore be:
+	 * - as output
+	 * - as input but tied high forever!
+	 * This driver set the pin as output.
+	 */
+	#warning SPI SS pin set as output for proper operation, check schematics for possible conflicts.
+	ATOMIC(SPI_DDR |= BV(SPI_SS_BIT));
+
+	ATOMIC(SPI_DDR &= ~BV(SPI_MISO_BIT));
+	/* Enable SPI, IRQ on, Master */
+	SPCR = BV(SPE) | BV(SPIE) | BV(MSTR);
+
+	/* Set data order */
+	#if CONFIG_SPI_DATA_ORDER == SER_LSB_FIRST
+		SPCR |= BV(DORD);
+	#endif
 
+	/* Set SPI clock rate */
+	#if CONFIG_SPI_CLOCK_DIV == 128
+		SPCR |= (BV(SPR1) | BV(SPR0));
+	#elif (CONFIG_SPI_CLOCK_DIV == 64 || CONFIG_SPI_CLOCK_DIV == 32)
+		SPCR |= BV(SPR1);
+	#elif (CONFIG_SPI_CLOCK_DIV == 16 || CONFIG_SPI_CLOCK_DIV == 8)
+		SPCR |= BV(SPR0);
+	#elif (CONFIG_SPI_CLOCK_DIV == 4 || CONFIG_SPI_CLOCK_DIV == 2)
+		// SPR0 & SDPR1 both at 0
+	#else
+		#error Unsupported SPI clock division factor.
+	#endif
+
+	/* Set SPI2X bit (spi double frequency) */
+	#if (CONFIG_SPI_CLOCK_DIV == 128 || CONFIG_SPI_CLOCK_DIV == 64 \
+	  || CONFIG_SPI_CLOCK_DIV == 16 || CONFIG_SPI_CLOCK_DIV == 4)
+		SPSR &= ~BV(SPI2X);
+	#elif (CONFIG_SPI_CLOCK_DIV == 32 || CONFIG_SPI_CLOCK_DIV == 8 || CONFIG_SPI_CLOCK_DIV == 2)
+		SPSR |= BV(SPI2X);
+	#else
+		#error Unsupported SPI clock division factor.
+	#endif
+
+	/* Set clock polarity */
+	#if CONFIG_SPI_CLOCK_POL == 1
+		SPCR |= BV(CPOL);
+	#endif
+
+	/* Set clock phase */
+	#if CONFIG_SPI_CLOCK_PHASE == 1
+		SPCR |= BV(CPHA);
+	#endif
 	SER_SPI_BUS_TXINIT;
 
 	SER_STROBE_INIT;
@@ -552,7 +606,7 @@ static void spi_cleanup(UNUSED_ARG(struct SerialHardware *, _hw))
 	SER_SPI_BUS_TXCLOSE;
 
 	/* Set all pins as inputs */
-	SPI_DDR &= ~(BV(SPI_MISO_BIT) | BV(SPI_MOSI_BIT) | BV(SPI_SCK_BIT));
+	ATOMIC(SPI_DDR &= ~(BV(SPI_MISO_BIT) | BV(SPI_MOSI_BIT) | BV(SPI_SCK_BIT) | BV(SPI_SS_BIT)));
 }
 
 static void spi_starttx(struct SerialHardware *_hw)
-- 
2.25.1