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author | Perry Hung <iperry@alum.mit.edu> | 2010-04-27 18:30:46 -0400 |
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committer | Perry Hung <iperry@alum.mit.edu> | 2010-04-27 18:30:46 -0400 |
commit | 28feb18a8f6d3dd2d0d78a40d4213407fb54e5dd (patch) | |
tree | 9bffb2da20492ceafd83101cbdff817870b92b1b /libmaple/spi.c | |
parent | 434e223114b0398b92f3c027747f82bd7187569a (diff) | |
download | librambutan-28feb18a8f6d3dd2d0d78a40d4213407fb54e5dd.tar.gz librambutan-28feb18a8f6d3dd2d0d78a40d4213407fb54e5dd.zip |
Added a spi send block function
Diffstat (limited to 'libmaple/spi.c')
-rw-r--r-- | libmaple/spi.c | 28 |
1 files changed, 26 insertions, 2 deletions
diff --git a/libmaple/spi.c b/libmaple/spi.c index ddc8346..4f34d1a 100644 --- a/libmaple/spi.c +++ b/libmaple/spi.c @@ -112,7 +112,7 @@ void spi_init(uint32 spi_num, * @param spi_num which spi to send on * @return data shifted back from the slave */ -void spi_tx(uint32 spi_num, uint8 data) { +uint8 spi_tx_byte(uint32 spi_num, uint8 data) { SPI *spi; ASSERT(spi_num == 1 || spi_num == 2); @@ -121,8 +121,32 @@ void spi_tx(uint32 spi_num, uint8 data) { spi->DR = data; - while (!(spi->SR & SR_TXE) || (spi->SR & SR_BSY)) + while (!(spi->SR & SR_TXE) || + (spi->SR & SR_BSY)) ; + + return spi->DR; +} + +uint8 spi_tx(uint32 spi_num, uint8 *buf, uint32 len) { + SPI *spi; + uint32 i; + + ASSERT(spi_num == 1 || spi_num == 2); + spi = (spi_num == 1) ? (SPI*)SPI1_BASE : (SPI*)SPI2_BASE; + + if (!len) { + return 0; + } + + while (i < len) { + spi->DR = buf[len]; + while (!(spi->SR & SR_TXE) || + (spi->SR & SR_BSY)) + ; + i++; + } + return spi->DR; } static void spi_gpio_cfg(const spi_dev *dev) { |