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Need to set SSM and SSI to prevent MODF errors

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git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@2160 42af7a65-404d-4744-a932-0658087f49c3
This commit is contained in:
patacongo 2009-10-18 21:55:10 +00:00
parent f924e30fbd
commit ea4ab4fad8
1 changed files with 4 additions and 4 deletions
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8
arch/arm/src/stm32/stm32_spi.c
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@ -1085,13 +1085,13 @@ static void spi_portinitialize(FAR struct stm32_spidev_s *priv)
* Master: MSTR=1
* 8-bit: DFF=0
* MSB tranmitted first: LSBFIRST=0
* No software slave management: SSI=0 SSM=0
* Replace NSS with SSI & SSI=1: SSI=1 SSM=1 (prevents MODF error)
* Two lines full duplex: BIDIMODE=0 BIDIOIE=(Don't care) and RXONLY=0
*/
clrbits = SPI_CR1_CPHA|SPI_CR1_CPOL|SPI_CR1_BR_MASK|SPI_CR1_LSBFIRST|SPI_CR1_SSI|
SPI_CR1_SSM|SPI_CR1_RXONLY|SPI_CR1_DFF|SPI_CR1_BIDIOE|SPI_CR1_BIDIMODE;
setbits = SPI_CR1_MSTR;
clrbits = SPI_CR1_CPHA|SPI_CR1_CPOL|SPI_CR1_BR_MASK|SPI_CR1_LSBFIRST|
SPI_CR1_RXONLY|SPI_CR1_DFF|SPI_CR1_BIDIOE|SPI_CR1_BIDIMODE;
setbits = SPI_CR1_MSTR|SPI_CR1_SSI|SPI_CR1_SSM;
spi_modifycr1(priv, setbits, clrbits);
/* Select a default frequency of approx. 400KHz */