From c28d7bc18782c21429ddab9fc985cfe0f6db375e Mon Sep 17 00:00:00 2001
From: Kuldeep Singh Dhaka <kuldeepdhaka9@gmail.com>
Date: Fri, 25 Jul 2014 02:10:12 +0530
Subject: [PATCH] stm32: spi: Standard mode selection

Allow setting cpol/cpha via standard mode numbers, instead of separate calls
for each bit.
---
 .../libopencm3/stm32/common/spi_common_all.h  |  1 +
 lib/stm32/common/spi_common_all.c             | 25 +++++++++++++++++++
 2 files changed, 26 insertions(+)

diff --git a/include/libopencm3/stm32/common/spi_common_all.h b/include/libopencm3/stm32/common/spi_common_all.h
index afff6e66..949fec1d 100644
--- a/include/libopencm3/stm32/common/spi_common_all.h
+++ b/include/libopencm3/stm32/common/spi_common_all.h
@@ -391,6 +391,7 @@ void spi_enable_tx_dma(uint32_t spi);
 void spi_disable_tx_dma(uint32_t spi);
 void spi_enable_rx_dma(uint32_t spi);
 void spi_disable_rx_dma(uint32_t spi);
+void spi_set_standard_mode(uint32_t spi, uint8_t mode);
 
 END_DECLS
 
diff --git a/lib/stm32/common/spi_common_all.c b/lib/stm32/common/spi_common_all.c
index 1619fecb..6e764916 100644
--- a/lib/stm32/common/spi_common_all.c
+++ b/lib/stm32/common/spi_common_all.c
@@ -709,4 +709,29 @@ void spi_disable_rx_dma(uint32_t spi)
 	SPI_CR2(spi) &= ~SPI_CR2_RXDMAEN;
 }
 
+/*---------------------------------------------------------------------------*/
+/** @brief SPI Standard Mode selection
+@details Set SPI standard Modes
+Mode | CPOL | CPHA
+---- | ---- | ----
+ 0   |  0   |  0
+ 1   |  0   |  1
+ 2   |  1   |  0
+ 3   |  1   |  1
+@param[in] spi Unsigned int32. SPI peripheral identifier @ref spi_reg_base.
+@param[in] mode Unsigned int8. Standard SPI mode (0, 1, 2, 3)
+@sa spi_set_clock_phase_0 spi_set_clock_phase_1
+@sa spi_set_clock_polarity_0 spi_set_clock_polarity_1
+*/
+
+void spi_set_standard_mode(uint32_t spi, uint8_t mode)
+{
+	if(mode > 3) {
+		return;
+	}
+	
+	uint32_t reg32 = SPI_CR1(spi) & ~(SPI_CR1_CPOL | SPI_CR1_CPHA);
+	SPI_CR1(spi) = reg32 | mode;
+}
+
 /**@}*/