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ChibiOS
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git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@1254 35acf78f-673a-0410-8e92-d51de3d6d3f4

This commit is contained in:
gdisirio 2009-10-25 13:36:28 +00:00
parent 81f043865e
commit 5d19ae768a
1 changed files with 27 additions and 7 deletions
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34
os/io/platforms/STM32/spi_lld.c
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@ -103,7 +103,31 @@ void spi_lld_init(void) {
*/ */
void spi_lld_setup(SPIDriver *spip) { void spi_lld_setup(SPIDriver *spip) {
/* SPI setup.*/
spip->spd_spi->CR1 = spip->spd_config->spc_cr1; spip->spd_spi->CR1 = spip->spd_config->spc_cr1;
/* DMA setup.*/
if ((spip->spd_config->spc_cr1 & SPI_CR1_DFF) != 0) {
/* Prepares for 16 bits transfer.*/
spip->spd_dmarx->CCR = spip->spd_dmaprio |
DMA_CCR1_MSIZE_0 | DMA_CCR1_PSIZE_0 |
DMA_CCR1_MINC |
DMA_CCR1_TEIE | DMA_CCR1_TCIE;
spip->spd_dmatx->CCR = spip->spd_dmaprio |
DMA_CCR1_MSIZE_0 | DMA_CCR1_PSIZE_0 |
DMA_CCR1_MINC | DMA_CCR1_DIR |
DMA_CCR1_TEIE | DMA_CCR1_TCIE;
}
else {
/* Prepares for 8 bits transfer.*/
spip->spd_dmarx->CCR = spip->spd_dmaprio | DMA_CCR1_MINC |
DMA_CCR1_TEIE | DMA_CCR1_TCIE;
spip->spd_dmatx->CCR = spip->spd_dmaprio |
DMA_CCR1_MINC | DMA_CCR1_DIR |
DMA_CCR1_TEIE | DMA_CCR1_TCIE;
}
spip->spd_dmarx->CPAR = (uint32_t)&spip->spd_spi->DR;
spip->spd_dmatx->CPAR = (uint32_t)&spip->spd_spi->DR;
} }
/** /**
@ -146,15 +170,11 @@ void spi_lld_unselect(SPIDriver *spip) {
*/ */
void spi_lld_exchange(SPIDriver *spip, size_t n, void *rxbuf, void *txbuf) { void spi_lld_exchange(SPIDriver *spip, size_t n, void *rxbuf, void *txbuf) {
/* /* DMA setup.*/
* DMA setup.
*/
spip->spd_dmarx->CNDTR = (uint32_t)n; spip->spd_dmarx->CNDTR = (uint32_t)n;
spip->spd_dmarx->CPAR = (uint32_t)&spip->spd_spi->DR; spip->spd_dmatx->CNDTR = (uint32_t)n;
spip->spd_dmarx->CMAR = (uint32_t)rxbuf; spip->spd_dmarx->CMAR = (uint32_t)rxbuf;
spip->spd_dmarx->CCR = spip->spd_dmaprio | spip->spd_dmatx->CMAR = (uint32_t)txbuf;
DMA_CCR1_MSIZE_0 | DMA_CCR1_MSIZE_0 |
DMA_CCR1_MINC | DMA_CCR1_TEIE | DMA_CCR1_TCIE;
} }
/** @} */ /** @} */