Added polled API to the STM32 SPI driver.

git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@2303 35acf78f-673a-0410-8e92-d51de3d6d3f4

2 files changed, 21 insertions, 0 deletions

diff --git a/os/hal/platforms/STM32/spi_lld.c b/os/hal/platforms/STM32/spi_lld.c
index be0a117e3..7d4d182bb 100644
--- a/os/hal/platforms/STM32/spi_lld.c
+++ b/os/hal/platforms/STM32/spi_lld.c
@@ -466,6 +466,26 @@ void spi_lld_receive(SPIDriver *spip, size_t n, void *rxbuf) {
   dma_start(spip);

 }

 

+/**

+ * @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->DR = frame;

+  while ((spip->spd_spi->SR & SPI_SR_RXNE) == 0)

+    ;

+  return spip->spd_spi->DR;

+}

+

 #endif /* CH_HAL_USE_SPI */

 

 /** @} */

diff --git a/os/hal/platforms/STM32/spi_lld.h b/os/hal/platforms/STM32/spi_lld.h
index effe0337c..54b995a02 100644
--- a/os/hal/platforms/STM32/spi_lld.h
+++ b/os/hal/platforms/STM32/spi_lld.h
@@ -282,6 +282,7 @@ 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