first test for K15

lib/uart_driver/AsyncComm.c

@@ -12,6 +12,8 @@
 
 #include "AsyncComm.h"
 
+#include "string.h"
+
 #include "stm32h7xx_ll_dma.h"
 #include "stm32h7xx_ll_usart.h"
 
@@ -210,7 +212,7 @@ void usart_send_data(const uart_desc_t* uart, const void* data, size_t len) {
  * \param[in]       str: String to send
  */
 void usart_send_string(const uart_desc_t* uart, const char* str) {
-    lwrb_write(&uart->data->tx_rb, str, strnlen(str, 255)); /* Write data to TX buffer for loopback */
+    lwrb_write(&uart->data->tx_rb, str, strlen(str)); /* Write data to TX buffer for loopback */
     usart_start_tx_dma_transfer(uart);                /* Then try to start transfer */
 }