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| author | Gregory Nutt <gnutt@nuttx.org> | 2013-08-16 11:35:22 -0600 |
|---|---|---|
| committer | Gregory Nutt <gnutt@nuttx.org> | 2013-08-16 11:35:22 -0600 |
| commit | 371f4b2a420fc5d335c8c30265c32299d0874ad5 (patch) | |
| tree | 3bff56e143e3ffde5a2c14d3c89812a3e3ed6dc8 /nuttx/arch/arm/src/stm32/stm32_spi.c | |
| parent | 5b14d5d128a35b8dc650bc1c4c113fad3a61e438 (diff) | |
| download | px4-nuttx-371f4b2a420fc5d335c8c30265c32299d0874ad5.tar.gz px4-nuttx-371f4b2a420fc5d335c8c30265c32299d0874ad5.tar.bz2 px4-nuttx-371f4b2a420fc5d335c8c30265c32299d0874ad5.zip | |
STM32 SPI: nbits interface extended to handle LSB- or MSB-first operation. From Teemu Pirinen
Diffstat (limited to 'nuttx/arch/arm/src/stm32/stm32_spi.c')
| -rw-r--r-- | nuttx/arch/arm/src/stm32/stm32_spi.c | 16 |
1 files changed, 13 insertions, 3 deletions
diff --git a/nuttx/arch/arm/src/stm32/stm32_spi.c b/nuttx/arch/arm/src/stm32/stm32_spi.c index 9bb072419..1f50d9e23 100644 --- a/nuttx/arch/arm/src/stm32/stm32_spi.c +++ b/nuttx/arch/arm/src/stm32/stm32_spi.c @@ -200,7 +200,7 @@ struct stm32_spidev_s sem_t exclsem; /* Held while chip is selected for mutual exclusion */ uint32_t frequency; /* Requested clock frequency */ uint32_t actual; /* Actual clock frequency */ - uint8_t nbits; /* Width of word in bits (8 or 16) */ + int8_t nbits; /* Width of word in bits (8 or 16) */ uint8_t mode; /* Mode 0,1,2,3 */ #endif }; @@ -1153,14 +1153,24 @@ static void spi_setbits(FAR struct spi_dev_s *dev, int nbits) switch (nbits) { + case -8: + setbits = SPI_CR1_LSBFIRST; + clrbits = SPI_CR1_DFF; + break; + case 8: setbits = 0; - clrbits = SPI_CR1_DFF; + clrbits = SPI_CR1_DFF|SPI_CR1_LSBFIRST; + break; + + case -16: + setbits = SPI_CR1_DFF|SPI_CR1_LSBFIRST; + clrbits = 0; break; case 16: setbits = SPI_CR1_DFF; - clrbits = 0; + clrbits = SPI_CR1_LSBFIRST; break; default: |