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, 26 insertions, 10 deletions

diff --git a/os/hal/platforms/LPC214x/spi_lld.c b/os/hal/platforms/LPC214x/spi_lld.c
index 7c3287298..6df0106b2 100644
--- a/os/hal/platforms/LPC214x/spi_lld.c
+++ b/os/hal/platforms/LPC214x/spi_lld.c
@@ -99,7 +99,7 @@ static void serve_interrupt(SPIDriver *spip) {
       (void)ssp->SSP_DR;

     if (--spip->spd_rxcnt == 0) {

       chDbgAssert(spip->spd_txcnt == 0,

-                  "chSemResetI(), #1", "counter out of synch");

+                  "spi_serve_interrupt(), #1", "counter out of synch");

       /* Stops the IRQ sources.*/

       ssp->SSP_IMSC = 0;

       /* Portable SPI ISR code defined in the high level driver, note, it is

@@ -178,7 +178,7 @@ void spi_lld_start(SPIDriver *spip) {
   spip->spd_ssp->SSP_ICR  = ICR_RT | ICR_ROR;

   spip->spd_ssp->SSP_CR0  = spip->spd_config->spc_cr0;

   spip->spd_ssp->SSP_CPSR = spip->spd_config->spc_cpsr;

-  spip->spd_ssp->SSP_CR1  = spip->spd_config->spc_cr1 | CR1_SSE;

+  spip->spd_ssp->SSP_CR1  = CR1_SSE;

 }

 

 /**

@@ -191,16 +191,15 @@ void spi_lld_start(SPIDriver *spip) {
 void spi_lld_stop(SPIDriver *spip) {

 

   if (spip->spd_state != SPI_STOP) {

+    spip->spd_ssp->SSP_CR1  = 0;

+    spip->spd_ssp->SSP_CR0  = 0;

+    spip->spd_ssp->SSP_CPSR = 0;

 #if LPC214x_SPI_USE_SSP

     if (&SPID1 == spip) {

       PCONP = (PCONP & PCALL) & ~PCSPI1;

       VICIntEnClear = INTMASK(SOURCE_SPI1);

     }

 #endif

-    spip->spd_ssp->SSP_CR1  = 0;

-    spip->spd_ssp->SSP_CR0  = 0;

-    spip->spd_ssp->SSP_CPSR = 0;

-    PCONP &= ~PCSPI1;

   }

 }

 

@@ -318,6 +317,26 @@ void spi_lld_receive(SPIDriver *spip, size_t n, void *rxbuf) {
   spip->spd_ssp->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->SSP_DR = (uint32_t)frame;

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

+    ;

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

+}

+

 #endif /* CH_HAL_USE_SPI */

 

 /** @} */

diff --git a/os/hal/platforms/LPC214x/spi_lld.h b/os/hal/platforms/LPC214x/spi_lld.h
index eafa23f88..a4b16f76a 100644
--- a/os/hal/platforms/LPC214x/spi_lld.h
+++ b/os/hal/platforms/LPC214x/spi_lld.h
@@ -117,10 +117,6 @@ typedef struct {
    */

   uint16_t              spc_cr0;

   /**

-   * @brief SSP CR1 initialization data.

-   */

-  uint16_t              spc_cr1;

-  /**

    * @brief SSP CPSR initialization data.

    */

   uint32_t              spc_cpsr;

@@ -205,6 +201,7 @@ 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