Encoding.

[hackover2013-badge-firmware.git] / core / ssp / ssp.c

diff --git a/core/ssp/ssp.c b/core/ssp/ssp.c
index b6beef2..de2910e 100644 (file)
--- a/core/ssp/ssp.c
+++ b/core/ssp/ssp.c
@@ -179,7 +179,7 @@ void sspInit (uint8_t portNum, sspClockPolarity_t polarity, sspClockPhase_t phas
     gpioSetValue(SSP0_CSPORT, SSP0_CSPIN, 1);
     gpioSetPullup(&IOCON_PIO0_2, gpioPullupMode_Inactive);  // Board has external pull-up
   
-    /* If SSP0CLKDIV = DIV1 -- (PCLK / (CPSDVSR � [SCR+1])) = (72,000,000 / (2 x [8 + 1])) = 4.0 MHz */
+    /* If SSP0CLKDIV = DIV1 -- (PCLK / (CPSDVSR * [SCR+1])) = (72,000,000 / (2 x [8 + 1])) = 4.0 MHz */
     uint32_t configReg = ( SSP_SSP0CR0_DSS_8BIT   // Data size = 8-bit
                   | SSP_SSP0CR0_FRF_SPI           // Frame format = SPI
                   | SSP_SSP0CR0_SCR_8);           // Serial clock rate = 8
@@ -236,7 +236,7 @@ void sspInit (uint8_t portNum, sspClockPolarity_t polarity, sspClockPhase_t phas
                 Block length of the data buffer
 */
 /**************************************************************************/
-void sspSend (uint8_t portNum, uint8_t *buf, uint32_t length)
+void sspSend (uint8_t portNum, uint8_t const *buf, uint32_t length)
 {
   uint32_t i;
   uint8_t Dummy = Dummy;
@@ -295,3 +295,27 @@ void sspReceive(uint8_t portNum, uint8_t *buf, uint32_t length)
   return; 
 }
 
+void sspSendReceive(uint8_t portNum, uint8_t *buf, uint32_t length)
+{
+  uint32_t i;
+  uint8_t Dummy = Dummy;
+
+  if (portNum == 0)
+    {
+      for (i = 0; i < length; i++)
+       {
+         /* Move on only if NOT busy and TX FIFO not full. */
+         while ((SSP_SSP0SR & (SSP_SSP0SR_TNF_NOTFULL | SSP_SSP0SR_BSY_BUSY)) != SSP_SSP0SR_TNF_NOTFULL);
+         SSP_SSP0DR = *buf;
+  
+         while ( (SSP_SSP0SR & (SSP_SSP0SR_BSY_BUSY|SSP_SSP0SR_RNE_NOTEMPTY)) != SSP_SSP0SR_RNE_NOTEMPTY );
+         /* Whenever a byte is written, MISO FIFO counter increments, Clear FIFO 
+      on MISO. Otherwise, when SSP0Receive() is called, previous data byte
+      is left in the FIFO. */
+         *buf = SSP_SSP0DR;
+         buf++;
+       }
+    }
+
+  return; 
+}