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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 <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include "bsp/board_api.h"
#include "tusb.h"
/* 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 void led_blinking_task(void);
static 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
cdc_task();
led_blinking_task();
}
}
// echo to either Serial0 or Serial1
// with Serial0 as all lower case, Serial1 as all upper case
static void echo_serial_port(uint8_t itf, uint8_t buf[], uint32_t count) {
uint8_t const case_diff = 'a' - 'A';
for (uint32_t i = 0; i < count; i++) {
if (itf == 0) {
// echo back 1st port as lower case
if (isupper(buf[i])) {
buf[i] += case_diff;
}
} else {
// echo back 2nd port as upper case
if (islower(buf[i])) {
buf[i] -= case_diff;
}
}
tud_cdc_n_write_char(itf, buf[i]);
}
tud_cdc_n_write_flush(itf);
}
// 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;
}
//--------------------------------------------------------------------+
// USB CDC
//--------------------------------------------------------------------+
static void cdc_task(void) {
for (uint8_t itf = 0; itf < CFG_TUD_CDC; itf++) {
// connected() check for DTR bit
// Most but not all terminal client set this when making connection
// if ( tud_cdc_n_connected(itf) )
{
if (tud_cdc_n_available(itf)) {
uint8_t buf[64];
uint32_t count = tud_cdc_n_read(itf, buf, sizeof(buf));
// echo back to both serial ports
echo_serial_port(0, buf, count);
echo_serial_port(1, buf, count);
}
// Press on-board button to send Uart status notification
static uint32_t btn_prev = 0;
static cdc_notify_uart_state_t uart_state = { .value = 0 };
const uint32_t btn = board_button_read();
if (!btn_prev && btn) {
uart_state.dsr ^= 1;
tud_cdc_notify_uart_state(&uart_state);
}
btn_prev = btn;
}
}
}
// Invoked when cdc when line state changed e.g connected/disconnected
// Use to reset to DFU when disconnect with 1200 bps
void tud_cdc_line_state_cb(uint8_t instance, bool dtr, bool rts) {
(void)rts;
// DTR = false is counted as disconnected
if (!dtr) {
// touch1200 only with first CDC instance (Serial)
if (instance == 0) {
cdc_line_coding_t coding;
tud_cdc_get_line_coding(&coding);
if (coding.bit_rate == 1200) {
board_reset_to_bootloader();
}
}
}
}
//--------------------------------------------------------------------+
// BLINKING TASK
//--------------------------------------------------------------------+
void led_blinking_task(void) {
static uint32_t start_ms = 0;
static bool led_state = false;
// 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 = 1 - led_state; // toggle
}
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