ringbuffer and tests

cube/User/Src/logger.c

@@ -0,0 +1,17 @@
+#include <main.h>
+#include <usart.h>
+#include <logger.h>
+
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+
+void log(char *msg) {
+    uint16_t len = strlen(msg);
+
+    if (HAL_UART_Transmit_IT(&debugUart, msg, len) != HAL_OK) {
+        if(RingBuffer_Write(&txBuf, msg, len) != RING_BUFFER_OK)
+        return 0;
+    }
+    return 1;
+}