Added a polled exchange function to the SPI driver model, implemented on LPCxxxx SPI drivers.

git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@2302 35acf78f-673a-0410-8e92-d51de3d6d3f4

2 files changed, 24 insertions, 4 deletions

diff --git a/os/hal/platforms/LPC13xx/spi_lld.c b/os/hal/platforms/LPC13xx/spi_lld.c
index d9b8ef06f..ee6a71c8f 100644
--- a/os/hal/platforms/LPC13xx/spi_lld.c
+++ b/os/hal/platforms/LPC13xx/spi_lld.c
@@ -196,18 +196,17 @@ void spi_lld_start(SPIDriver *spip) {
 void spi_lld_stop(SPIDriver *spip) {

 

   if (spip->spd_state != SPI_STOP) {

+    spip->spd_ssp->CR1  = 0;

+    spip->spd_ssp->CR0  = 0;

+    spip->spd_ssp->CPSR = 0;

 #if LPC13xx_SPI_USE_SSP0

     if (&SPID1 == spip) {

       LPC_SYSCON->PRESETCTRL &= ~1;

       LPC_SYSCON->SYSAHBCLKCTRL &= ~(1 << 11);

       LPC_SYSCON->SSPCLKDIV = 0;

       NVICDisableVector(SSP_IRQn);

-      return;

     }

 #endif

-    spip->spd_ssp->CR1  = 0;

-    spip->spd_ssp->CR0  = 0;

-    spip->spd_ssp->CPSR = 0;

   }

 }

 

@@ -325,6 +324,26 @@ void spi_lld_receive(SPIDriver *spip, size_t n, void *rxbuf) {
   spip->spd_ssp->IMSC = IMSC_ROR | IMSC_RT | IMSC_TX | IMSC_RX;

 }

 

+/**

+ * @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_ssp->DR = (uint32_t)frame;

+  while ((spip->spd_ssp->SR & SR_RNE) == 0)

+    ;

+  return (uint16_t)spip->spd_ssp->DR;

+}

+

 #endif /* CH_HAL_USE_SPI */

 

 /** @} */

diff --git a/os/hal/platforms/LPC13xx/spi_lld.h b/os/hal/platforms/LPC13xx/spi_lld.h
index c85f358b8..add7c3323 100644
--- a/os/hal/platforms/LPC13xx/spi_lld.h
+++ b/os/hal/platforms/LPC13xx/spi_lld.h
@@ -334,6 +334,7 @@ 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