zcy
/
tinySA
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Added polled API to the AT91SAM7 SPI driver. 

git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@2304 35acf78f-673a-0410-8e92-d51de3d6d3f4
master
gdisirio 2010-10-30 13:31:33 +00:00
parent 76603ff540
commit b8fd99cc2a
2 changed files with 22 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

21
os/hal/platforms/AT91SAM7/spi_lld.c
View File

@ -374,6 +374,27 @@ void spi_lld_receive(SPIDriver *spip, size_t n, void *rxbuf) {
spip->spd_spi->SPI_PTCR = AT91C_PDC_RXTEN | AT91C_PDC_TXTEN;
}
/**
* @brief Exchanges one frame using a polled wait.
* @details This synchronous function exchanges one frame using a polled
* synchronization method. This function is useful when exchanging
* small amount of data on high speed channels, usually in this
* situation is much more efficient just wait for completion using
* polling than suspending the thread waiting for an interrupt.
*
* @param[in] spip pointer to the @p SPIDriver object
* @param[in] frame the data frame to send over the SPI bus
* @return The received data frame from the SPI bus.
*/
uint16_t spi_lld_polled_exchange(SPIDriver *spip, uint16_t frame) {
spip->spd_spi->SPI_CR = AT91C_SPI_SPIEN;
spip->spd_spi->SPI_TDR = frame;
while ((spip->spd_spi->SPI_SR & AT91C_SPI_RDRF) == 0)
;
return spip->spd_spi->SPI_RDR;
}
#endif /* CH_HAL_USE_SPI */
/** @} */

1
os/hal/platforms/AT91SAM7/spi_lld.h
View File

@ -213,6 +213,7 @@ extern "C" {
const void *txbuf, void *rxbuf);
void spi_lld_send(SPIDriver *spip, size_t n, const void *txbuf);
void spi_lld_receive(SPIDriver *spip, size_t n, void *rxbuf);
uint16_t spi_lld_polled_exchange(SPIDriver *spip, uint16_t frame);
#ifdef __cplusplus
}
#endif