Waveshare_RP2350_USB_A/USB-Serial
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dark98
2026-09-06 16:24:00 +01:00
commit 5e42f9c568
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USB-Serial.cpp
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#include <stdio.h>
#include <string.h>
#include "pico/stdlib.h"
#include "pico/unique_id.h"
#include "hardware/uart.h"
#include "hardware/irq.h"
#include "hardware/gpio.h"
#include "hardware/clocks.h"
#include "tusb.h"
//--------------------------------------------------------------------+
// UART Configuration
//--------------------------------------------------------------------+
#define UART_ID uart0
#define UART_IRQ UART0_IRQ
#define UART_TX_PIN 0
#define UART_RX_PIN 1
#define DEFAULT_BAUD 115200
// Activity / Heartbeat LED Pin
#define LED_PIN_WS 16
#define LED_PIN_PICO 25
// UART RX Ring Buffer for capture
#define BUFFER_SIZE 4096
static volatile struct {
uint8_t buf[BUFFER_SIZE];
volatile uint32_t head;
volatile uint32_t tail;
} uart_rx_ring;
static inline bool ring_is_empty(void) {
return uart_rx_ring.head == uart_rx_ring.tail;
}
static inline void ring_push(uint8_t c) {
uint32_t next = (uart_rx_ring.head + 1) % BUFFER_SIZE;
if (next != uart_rx_ring.tail) {
uart_rx_ring.buf[uart_rx_ring.head] = c;
uart_rx_ring.head = next;
}
}
static inline uint8_t ring_pop(void) {
uint8_t c = uart_rx_ring.buf[uart_rx_ring.tail];
uart_rx_ring.tail = (uart_rx_ring.tail + 1) % BUFFER_SIZE;
return c;
}
//--------------------------------------------------------------------+
// UART Interrupt Handler
//--------------------------------------------------------------------+
static void on_uart_rx(void) {
while (uart_is_readable(UART_ID)) {
uint8_t ch = (uint8_t)uart_getc(UART_ID);
ring_push(ch);
}
}
//--------------------------------------------------------------------+
// Hardware UART Setup
//--------------------------------------------------------------------+
static void setup_uart(uint32_t baudrate) {
uart_init(UART_ID, baudrate);
gpio_set_function(UART_TX_PIN, GPIO_FUNC_UART);
gpio_set_function(UART_RX_PIN, GPIO_FUNC_UART);
gpio_pull_up(UART_RX_PIN);
uart_set_hw_flow(UART_ID, false, false);
uart_set_format(UART_ID, 8, 1, UART_PARITY_NONE);
uart_set_fifo_enabled(UART_ID, true);
// Set up and enable the interrupt handlers
irq_set_exclusive_handler(UART_IRQ, on_uart_rx);
irq_set_enabled(UART_IRQ, true);
// Enable UART RX interrupt
uart_set_irq_enables(UART_ID, true, false);
}
//--------------------------------------------------------------------+
// USB Descriptors
//--------------------------------------------------------------------+
#define USB_VID 0x2E8A // Raspberry Pi
#define USB_PID 0x000A // Raspberry Pi Pico CDC
#define USB_BCD 0x0200
tusb_desc_device_t const desc_device = {
.bLength = sizeof(tusb_desc_device_t),
.bDescriptorType = TUSB_DESC_DEVICE,
.bcdUSB = USB_BCD,
.bDeviceClass = TUSB_CLASS_MISC,
.bDeviceSubClass = MISC_SUBCLASS_COMMON,
.bDeviceProtocol = MISC_PROTOCOL_IAD,
.bMaxPacketSize0 = CFG_TUD_ENDPOINT0_SIZE,
.idVendor = USB_VID,
.idProduct = USB_PID,
.bcdDevice = 0x0100,
.iManufacturer = 0x01,
.iProduct = 0x02,
.iSerialNumber = 0x03,
.bNumConfigurations = 0x01
};
extern "C" uint8_t const *tud_descriptor_device_cb(void) {
return (uint8_t const *) &desc_device;
}
enum {
ITF_NUM_CDC = 0,
ITF_NUM_CDC_DATA,
ITF_NUM_TOTAL
};
#define EPNUM_CDC_NOTIF 0x81
#define EPNUM_CDC_OUT 0x02
#define EPNUM_CDC_IN 0x82
#define CONFIG_TOTAL_LEN (TUD_CONFIG_DESC_LEN + TUD_CDC_DESC_LEN)
uint8_t const desc_configuration[] = {
TUD_CONFIG_DESCRIPTOR(1, ITF_NUM_TOTAL, 0, CONFIG_TOTAL_LEN, 0x00, 100),
TUD_CDC_DESCRIPTOR(ITF_NUM_CDC, 4, EPNUM_CDC_NOTIF, 8, EPNUM_CDC_OUT, EPNUM_CDC_IN, 64),
};
extern "C" uint8_t const *tud_descriptor_configuration_cb(uint8_t index) {
(void) index;
return desc_configuration;
}
enum {
STRID_LANGID = 0,
STRID_MANUFACTURER,
STRID_PRODUCT,
STRID_SERIAL,
STRID_CDC_INTERFACE,
};
static char const *string_desc_arr[] = {
(const char[]) { 0x09, 0x04 },
"Waveshare",
"RP2350 USB-UART Adapter",
NULL,
"RP2350 CDC UART",
};
static uint16_t _desc_str[64];
extern "C" uint16_t const *tud_descriptor_string_cb(uint8_t index, uint16_t langid) {
(void) langid;
size_t chr_count = 0;
switch (index) {
case STRID_LANGID:
memcpy(&_desc_str[1], string_desc_arr[0], 2);
chr_count = 1;
break;
case STRID_SERIAL: {
pico_unique_board_id_t id;
pico_get_unique_board_id(&id);
char serial_str[2 * PICO_UNIQUE_BOARD_ID_SIZE_BYTES + 1];
pico_get_unique_board_id_string(serial_str, sizeof(serial_str));
chr_count = strlen(serial_str);
if (chr_count > 32) chr_count = 32;
for (size_t i = 0; i < chr_count; i++) {
_desc_str[1 + i] = serial_str[i];
}
break;
}
default: {
if (!(index < sizeof(string_desc_arr) / sizeof(string_desc_arr[0]))) {
return NULL;
}
const char *str = string_desc_arr[index];
if (!str) return NULL;
chr_count = strlen(str);
size_t const max_count = sizeof(_desc_str) / sizeof(_desc_str[0]) - 1;
if (chr_count > max_count) chr_count = max_count;
for (size_t i = 0; i < chr_count; i++) {
_desc_str[1 + i] = str[i];
}
break;
}
}
_desc_str[0] = (uint16_t) ((TUSB_DESC_STRING << 8) | (2 * chr_count + 2));
return _desc_str;
}
//--------------------------------------------------------------------+
// TinyUSB CDC Callbacks
//--------------------------------------------------------------------+
extern "C" void tud_cdc_line_state_cb(uint8_t itf, bool dtr, bool rts) {
(void) itf;
(void) dtr;
(void) rts;
}
extern "C" void tud_cdc_line_coding_cb(uint8_t itf, cdc_line_coding_t const* p_line_coding) {
(void) itf;
if (p_line_coding->bit_rate > 0) {
uart_set_baudrate(UART_ID, p_line_coding->bit_rate);
}
uint data_bits = (p_line_coding->data_bits >= 5 && p_line_coding->data_bits <= 8)
? p_line_coding->data_bits : 8;
uint stop_bits = (p_line_coding->stop_bits == 2) ? 2 : 1;
uart_parity_t parity = UART_PARITY_NONE;
if (p_line_coding->parity == 1) {
parity = UART_PARITY_ODD;
} else if (p_line_coding->parity == 2) {
parity = UART_PARITY_EVEN;
}
uart_set_format(UART_ID, data_bits, stop_bits, parity);
}
//--------------------------------------------------------------------+
// Main Bridge Task
//--------------------------------------------------------------------+
static void cdc_uart_bridge_task(void) {
// 1. Drain any available hardware UART RX bytes directly into ring buffer
while (uart_is_readable(UART_ID)) {
ring_push((uint8_t)uart_getc(UART_ID));
}
// 2. Forward UART RX -> USB CDC TX
if (!ring_is_empty()) {
uint32_t available = tud_cdc_write_available();
if (available > 0) {
uint8_t tx_buf[64];
uint32_t count = 0;
while (count < sizeof(tx_buf) && count < available && !ring_is_empty()) {
tx_buf[count++] = ring_pop();
}
if (count > 0) {
tud_cdc_write(tx_buf, count);
tud_cdc_write_flush();
}
}
}
// 3. Forward USB CDC RX -> UART TX
if (tud_cdc_available()) {
uint8_t usb_rx_buf[64];
uint32_t count = tud_cdc_read(usb_rx_buf, sizeof(usb_rx_buf));
if (count > 0) {
uart_write_blocking(UART_ID, usb_rx_buf, count);
}
}
}
//--------------------------------------------------------------------+
// Main Entry
//--------------------------------------------------------------------+
int main(void) {
stdio_init_all();
// Initialize Activity LED
gpio_init(LED_PIN_WS);
gpio_set_dir(LED_PIN_WS, GPIO_OUT);
gpio_put(LED_PIN_WS, 0);
#ifdef LED_PIN_PICO
gpio_init(LED_PIN_PICO);
gpio_set_dir(LED_PIN_PICO, GPIO_OUT);
gpio_put(LED_PIN_PICO, 0);
#endif
// Initialize UART0 on GP0 (TX) and GP1 (RX)
setup_uart(DEFAULT_BAUD);
// Initialize TinyUSB Device stack
tusb_init();
uint32_t last_blink = 0;
bool led_state = false;
while (true) {
// Process TinyUSB device events
tud_task();
// Process bidirectional data transfer
cdc_uart_bridge_task();
// Heartbeat blink (toggle every 250ms)
uint32_t now = to_ms_since_boot(get_absolute_time());
if (now - last_blink >= 250) {
last_blink = now;
led_state = !led_state;
gpio_put(LED_PIN_WS, led_state);
#ifdef LED_PIN_PICO
gpio_put(LED_PIN_PICO, led_state);
#endif
}
}
return 0;
}