From 98997691d314b6143fab27bfa1832c200e39bb57 Mon Sep 17 00:00:00 2001
From: Uwe Hermann <uwe@hermann-uwe.de>
Date: Wed, 30 Dec 2009 23:28:40 +0100
Subject: [PATCH] Add first version of spi_enable()/spi_disable().

---
 include/libopenstm32/spi.h |  2 ++
 lib/spi.c                  | 21 +++++++++++++++++++++
 2 files changed, 23 insertions(+)

diff --git a/include/libopenstm32/spi.h b/include/libopenstm32/spi.h
index f7baa793..11afa32a 100644
--- a/include/libopenstm32/spi.h
+++ b/include/libopenstm32/spi.h
@@ -150,6 +150,8 @@
 /* --- Function prototypes ------------------------------------------------- */
 
 int spi_init_master(u32 spi, u32 br, u32 cpol, u32 cpha, u32 dff, u32 lsbfirst);
+void spi_enable(u32 spi);
+void spi_disable(u32 spi);
 void spi_write(u32 spi, u16 data);
 u16 spi_read(u32 spi);
 
diff --git a/lib/spi.c b/lib/spi.c
index 02936eed..d11cf5d4 100644
--- a/lib/spi.c
+++ b/lib/spi.c
@@ -51,6 +51,27 @@ int spi_init_master(u32 spi, u32 br, u32 cpol, u32 cpha, u32 dff, u32 lsbfirst)
 	return 0; /* TODO */
 }
 
+/* TODO: Error handling? */
+void spi_enable(u32 spi)
+{
+	u32 reg32;
+
+	reg32 = SPI_CR1(spi);
+	reg32 |= SPI_CR1_SPE;		/* Enable SPI. */
+	SPI_CR1(spi) = reg32;
+}
+
+/* TODO: Error handling? */
+void spi_disable(u32 spi)
+{
+	u32 reg32;
+
+	/* TODO: Follow procedure from section 23.3.8 in the techref manual. */
+	reg32 = SPI_CR1(spi);
+	reg32 &= ~(SPI_CR1_SPE);	/* Disable SPI. */
+	SPI_CR1(spi) = reg32;
+}
+
 void spi_write(u32 spi, u16 data)
 {
 	/* Write data (8 or 16 bits, depending on DFF) into DR. */