update example

examples/device/board_test/src/main.c

@@ -49,25 +49,28 @@ int main(void) {
   while (1) {
     uint32_t interval_ms = board_button_read() ? BLINK_PRESSED : BLINK_UNPRESSED;
 
+    int ch = board_getchar();
+    if (ch > 0) {
+      board_putchar(ch);
+    }
+
     // Blink and print every interval ms
     if (!(board_millis() - start_ms < interval_ms)) {
-      board_uart_write(HELLO_STR, strlen(HELLO_STR));
-
       start_ms = board_millis();
 
+      if (ch < 0) {
+        // skip if echoing
+        printf(HELLO_STR);
+        board_uart_write(HELLO_STR, strlen(HELLO_STR));
+      }
+
       board_led_write(led_state);
       led_state = 1 - led_state; // toggle
     }
-
-    // echo
-    uint8_t ch;
-    if (board_uart_read(&ch, 1) > 0) {
-      board_uart_write(&ch, 1);
-    }
   }
 }
 
-#if TUSB_MCU_VENDOR_ESPRESSIF
+#ifdef ESP_PLATFORM
 void app_main(void) {
   main();
 }

examples/host/cdc_msc_hid/src/cdc_app.c

@@ -72,7 +72,10 @@ void tuh_cdc_rx_cb(uint8_t idx) {
   if (count) {
     buf[count] = 0;
     printf("%s", (char*) buf);
-    fflush(stdout);
+
+    #ifndef __ICCARM__     // TODO IAR doesn't support stream control ?
+    fflush(stdout);// flush right away, else nanolib will wait for newline
+    #endif
   }
 }
 

hw/bsp/rp2040/family.c

@@ -282,6 +282,10 @@ int board_getchar(void) {
   return getchar_timeout_us(0);
 }
 
+void board_putchar(int c) {
+  stdio_putchar(c);
+}
+
 //--------------------------------------------------------------------+
 // USB Interrupt Handler
 // rp2040 implementation will install appropriate handler when initializing