Merge pull request #256 from Infineon/develop

SPI SD and timeout I2C

Author: jaenrig-ifx

libraries/SPI/src/SPI.h

@@ -35,8 +35,11 @@
 //#define USE_SW_SPI
 
 // Define USE_XMC_RELAX_KIT_SD allows to use the SD Lib to communicate with a SD Card over
-// the on-board SD Card Slot
-//#define USE_XMC_RELAX_KIT_SD
+// the on-board SD Card Slot. This feature is only available on XMC4700 RelaxKits.
+#if defined(XMC4700_Relax_Kit)
+    #define USE_XMC_RELAX_KIT_SD
+#endif
+
 
 #define SPI_MODE0 0x00
 #define SPI_MODE1 0x01

libraries/Wire/src/Wire.cpp

@@ -245,6 +245,14 @@ uint8_t TwoWire::requestFrom(uint8_t address, uint8_t quantity, uint32_t iaddres
         XMC_I2C_CH_MasterStart(XMC_I2C_config->channel, (txAddress << 1), XMC_I2C_CH_CMD_READ);
     }
 
+    timeout = WIRE_COMMUNICATION_TIMEOUT;
+    // wait for ACK or timeout incase no ACK is received, a time-based wait-state is added since XMC devices run at variable frequencies
+    while(((XMC_I2C_CH_GetStatusFlag(XMC_I2C_config->channel) & XMC_I2C_CH_STATUS_FLAG_ACK_RECEIVED) == 0U) || timeout == 0)
+    {
+        delay(1);
+        timeout--;
+    }
+
     for (uint8_t count = 0; count < (quantity - 1); count ++)
     {
         XMC_I2C_CH_MasterReceiveAck(XMC_I2C_config->channel);

variants/XMC4700/config/XMC4700_Relax_Kit/pins_arduino.h

@@ -86,10 +86,10 @@ extern uint8_t MOSI;
 extern uint8_t MISO;
 extern uint8_t SCK;
 
-#define PIN_SPI_SS_SD    28
-#define PIN_SPI_MOSI_SD  29
-#define PIN_SPI_MISO_SD  30
-#define PIN_SPI_SCK_SD   31
+#define PIN_SPI_SS_SD    26
+#define PIN_SPI_MOSI_SD  27
+#define PIN_SPI_MISO_SD  28
+#define PIN_SPI_SCK_SD   29
 
 static const uint8_t SS_SD   = PIN_SPI_SS_SD;
 static const uint8_t MOSI_SD = PIN_SPI_MOSI_SD;