add initial support for output using ITM via SWO (not tested though)

demos/bsp/boards/board.h

@@ -56,6 +56,7 @@
 #endif
 
 #include <stdint.h>
+#include "common/binary.h" // This file is too good to not use
 
 #define BOARD_AT86RF2XX             0
 #define BOARD_LPCXPRESSO1347        1

demos/bsp/boards/board_lpcxpresso1347.c

@@ -52,6 +52,11 @@ void board_init(void)
 #if CFG_UART_ENABLE
   UARTInit(CFG_UART_BAUDRATE);
 #endif
+
+#if CFG_PRINTF_TARGET == PRINTF_TARGET_SWO
+  LPC_IOCON->PIO0_9 &= ~0x07;    /*  UART I/O config */
+  LPC_IOCON->PIO0_9 |= 0x03;     /* UART RXD */
+#endif
 }
 
 //--------------------------------------------------------------------+

demos/bsp/boards/board_ngx4330.c

@@ -49,11 +49,6 @@
 #include "lpc43xx_i2s.h"
 #include "lpc43xx_emc.h"
 
-// TODO abstract later: n-th Bit
-#ifndef BIT_
-#define BIT_(n) (1 << (n))
-#endif
-
 #define BOARD_MAX_LEDS  2
 const static struct {
   uint8_t port;

demos/bsp/boards/printf_retarget.c

@@ -48,7 +48,20 @@
 int __sys_write (int iFileHandle, char *pcBuffer, int iLength)
 {
   (void) iFileHandle;
+
+#if CFG_PRINTF_TARGET == PRINTF_TARGET_UART
 	return board_uart_send((uint8_t*)pcBuffer, iLength);
+#elif CFG_PRINTF_TARGET == PRINTF_TARGET_SWO
+	uint32_t i;
+	for (i = 0; i<iLength; i++)
+	{
+		ITM_SendChar(pcBuffer[i]); // print each character
+	}
+	return iLength;
+#else
+	#error Thach, did you forget something
+#endif
+
 }
 
 // Called by bottom level of scanf routine within RedLib C library to read
@@ -58,7 +71,15 @@ int __sys_write (int iFileHandle, char *pcBuffer, int iLength)
 int __sys_readc (void)
 {
 	uint8_t c;
+
+#if CFG_PRINTF_TARGET == PRINTF_TARGET_UART
 	board_uart_recv(&c, 1);
+#elif CFG_PRINTF_TARGET == PRINTF_TARGET_SWO
+	c = ITM_ReceiveChar();
+#else
+	#error Thach, did you forget something
+#endif
+
 	return (int)c;
 }