Fix issue #709. Keep SPI_WR_BYTE_ORDER and SPI_RD_BYTE_ORDER when upd…

…ating the SPI_USER reg
SmingHub · Apr 20, 2016 · cc303fd · cc303fd
1 parent 444ffd6
commit cc303fd
Showing 1 changed file with 2 additions and 4 deletions.
diff --git a/Sming/SmingCore/SPI.cpp b/Sming/SmingCore/SPI.cpp
@@ -113,12 +113,11 @@ void SPIClass::endTransaction() {
  */
 uint32 SPIClass::transfer32(uint32 data, uint8 bits)
 {
-	uint32_t regvalue = 0;
+	uint32_t regvalue = READ_PERI_REG(SPI_USER(SPI_NO)) & (SPI_WR_BYTE_ORDER | SPI_RD_BYTE_ORDER);
 
 	while(READ_PERI_REG(SPI_CMD(SPI_NO))&SPI_USR);
 
 	regvalue |=  SPI_USR_MOSI | SPI_DOUTDIN | SPI_CK_I_EDGE;
-	regvalue &= ~(BIT2 | SPI_USR_ADDR | SPI_USR_DUMMY | SPI_USR_MISO | SPI_USR_COMMAND); //clear bit 2 see example IoT_Demo
 	WRITE_PERI_REG(SPI_USER(SPI_NO), regvalue);
 
 
@@ -183,12 +182,11 @@ void SPIClass::transfer(uint8 *buffer, size_t numberBytes) {
 		// compute the number of bits to clock
 		num_bits = bufLenght * 8;
 
-		uint32_t regvalue = 0;
+		uint32_t regvalue = READ_PERI_REG(SPI_USER(SPI_NO)) & (SPI_WR_BYTE_ORDER | SPI_RD_BYTE_ORDER);
 
 		while(READ_PERI_REG(SPI_CMD(SPI_NO))&SPI_USR);
 
 		regvalue |=  SPI_USR_MOSI | SPI_DOUTDIN | SPI_CK_I_EDGE;
-		regvalue &= ~(BIT2 | SPI_USR_ADDR | SPI_USR_DUMMY | SPI_USR_MISO | SPI_USR_COMMAND); //clear bit 2 see example IoT_Demo
 		WRITE_PERI_REG(SPI_USER(SPI_NO), regvalue);