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third_party/tinyusb/examples/device/cdc_msc/src/main.c

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+/*
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019 Ha Thach (tinyusb.org)
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ */
+
+#include "bsp/board_api.h"
+#include "tusb.h"
+
+//--------------------------------------------------------------------+
+// MACRO CONSTANT TYPEDEF PROTYPES
+//--------------------------------------------------------------------+
+
+/* Blink pattern
+ * - 250 ms  : device not mounted
+ * - 1000 ms : device mounted
+ * - 2500 ms : device is suspended
+ */
+enum {
+  BLINK_NOT_MOUNTED = 250,
+  BLINK_MOUNTED     = 1000,
+  BLINK_SUSPENDED   = 2500,
+};
+
+static uint32_t blink_interval_ms = BLINK_NOT_MOUNTED;
+static bool     blink_enable      = true;
+
+void led_blinking_task(void);
+void cdc_task(void);
+
+/*------------- MAIN -------------*/
+int main(void) {
+  board_init();
+
+  // init device stack on configured roothub port
+  tusb_rhport_init_t dev_init = {.role = TUSB_ROLE_DEVICE, .speed = TUSB_SPEED_AUTO};
+  tusb_init(BOARD_TUD_RHPORT, &dev_init);
+
+  board_init_after_tusb();
+
+  while (1) {
+    tud_task(); // tinyusb device task
+    led_blinking_task();
+
+    cdc_task();
+  }
+}
+
+//--------------------------------------------------------------------+
+// Device callbacks
+//--------------------------------------------------------------------+
+
+// Invoked when device is mounted
+void tud_mount_cb(void) {
+  blink_interval_ms = BLINK_MOUNTED;
+}
+
+// Invoked when device is unmounted
+void tud_umount_cb(void) {
+  blink_interval_ms = BLINK_NOT_MOUNTED;
+}
+
+// Invoked when usb bus is suspended
+// remote_wakeup_en : if host allow us  to perform remote wakeup
+// Within 7ms, device must draw an average of current less than 2.5 mA from bus
+void tud_suspend_cb(bool remote_wakeup_en) {
+  (void)remote_wakeup_en;
+  blink_interval_ms = BLINK_SUSPENDED;
+}
+
+// Invoked when usb bus is resumed
+void tud_resume_cb(void) {
+  blink_interval_ms = tud_mounted() ? BLINK_MOUNTED : BLINK_NOT_MOUNTED;
+}
+
+
+//--------------------------------------------------------------------+
+// USB CDC
+//--------------------------------------------------------------------+
+void cdc_task(void) {
+  // connected() check for DTR bit
+  // Most but not all terminal client set this when making connection
+  // if ( tud_cdc_connected() )
+  {
+    // connected and there are data available
+    if (tud_cdc_available()) {
+      // read data
+      char     buf[64];
+      uint32_t count = tud_cdc_read(buf, sizeof(buf));
+      (void)count;
+
+      // Echo back
+      // Note: Skip echo by commenting out write() and write_flush()
+      // for throughput test e.g
+      //    $ dd if=/dev/zero of=/dev/ttyACM0 count=10000
+      tud_cdc_write(buf, count);
+      tud_cdc_write_flush();
+    }
+
+    // Press on-board button to send Uart status notification
+    static cdc_notify_uart_state_t uart_state = {.value = 0};
+
+    static uint32_t btn_prev = 0;
+    const uint32_t  btn      = board_button_read();
+
+    if ((btn_prev == 0u) && (btn != 0u)) {
+      uart_state.dsr ^= 1;
+      uart_state.dcd ^= 1;
+      tud_cdc_notify_uart_state(&uart_state);
+    }
+    btn_prev = btn;
+  }
+}
+
+// Invoked when cdc when line state changed e.g connected/disconnected
+void tud_cdc_line_state_cb(uint8_t itf, bool dtr, bool rts) {
+  (void)itf;
+  (void)rts;
+
+  if (dtr) {
+    // Terminal connected
+    blink_enable = false;
+    board_led_write(true);
+  } else {
+    // Terminal disconnected
+    blink_enable = true;
+  }
+}
+
+// Invoked when CDC interface received data from host
+void tud_cdc_rx_cb(uint8_t itf) {
+  (void)itf;
+}
+
+//--------------------------------------------------------------------+
+// BLINKING TASK
+//--------------------------------------------------------------------+
+void led_blinking_task(void) {
+  static uint32_t start_ms  = 0;
+  static bool     led_state = false;
+
+  if (blink_enable) {
+    // Blink every interval ms
+    if (tusb_time_millis_api() - start_ms < blink_interval_ms) {
+      return; // not enough time
+    }
+    start_ms += blink_interval_ms;
+
+    board_led_write(led_state);
+    led_state = !led_state;
+  }
+}