Make UART block until transmission completes

2026-09-25 02:47:27 +08:00 · 2017-11-08 01:47:40 -05:00
parent e8b7deac5a
commit c0aa7c1157
1 changed files with 3 additions and 0 deletions
@@ -47,6 +47,9 @@ int _write(int file, char *data, int len) {
      // Start DMA background trasnfer
      HAL_UART_Transmit_DMA(&huart4, uart_tx_buf, len);
    } break;
+            while (huart4.gState != HAL_UART_STATE_READY) {
+                // Do nothing
+            }

    default: {
      written = 0;