major refactoring/simplifying

nrf52840/retarget.c

@@ -0,0 +1,73 @@
+#include "nrf.h"
+#include "SEGGER_RTT.h"
+
+int _SEGGER_TERM = 0;
+
+void set_logging_tag(uint32_t tag)
+{
+    int term = 0;
+    while (tag)
+    {
+        if (tag & 1)
+            break;
+        term++;
+        tag = tag >> 1;
+    }
+}
+
+#if defined(__CC_ARM)
+int fgetc(FILE * p_file)
+{
+    return '0';
+}
+
+int fputc(int ch, FILE * p_file)
+{
+    SEGGER_RTT_PutChar(_SEGGER_TERM, ch);
+    return ch;
+}
+
+#elif defined(__GNUC__) && defined(__SES_ARM)
+
+int __getchar(FILE * p_file)
+{
+    return '0';
+}
+
+int __putchar(int ch, FILE * p_file)
+{
+    SEGGER_RTT_PutChar(_SEGGER_TERM, ch);
+    return ch;
+}
+#elif defined(__GNUC__) && !defined(__SES_ARM)
+
+int _write(int file, const char * p_char, int len)
+{
+    int i;
+
+    UNUSED_PARAMETER(file);
+
+    for (i = 0; i < len; i++)
+    {
+        SEGGER_RTT_PutChar(_SEGGER_TERM, *p_char++);
+    }
+
+    return len;
+}
+
+int _read(int file, char * p_char, int len)
+{
+    *p_char = '0';
+    /*UNUSED_PARAMETER(file);*/
+    /*while (app_uart_get((uint8_t *)p_char) == NRF_ERROR_NOT_FOUND)*/
+    /*{*/
+        /*// No implementation needed.*/
+    /*}*/
+    return 1;
+}
+
+#else
+/*#elif defined(__ICCARM__)*/
+#error "No read/write for printing implemented for compiler"
+#endif
+