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Merge feac173c52 into c63359ef62

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narvalotech 2022-11-03 21:10:11 +01:00 • committed by GitHub
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3 changed files with 103 additions and 8 deletions
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10
CMakeLists.txt
View file

@ -2,6 +2,8 @@
cmake_minimum_required(VERSION 3.13)
option(FLOW_CONTROL "Enable Hardware Flow-control on the UARTs" FALSE)
include(pico-sdk/pico_sdk_init.cmake)
project(pico_uart_bridge)
@ -20,4 +22,12 @@ target_link_libraries(uart_bridge
pico_stdlib
tinyusb_device)
if(FLOW_CONTROL)
target_compile_definitions(uart_bridge PUBLIC FLOW_CONTROL=1)
endif()
if(LINE_CONTROL)
target_compile_definitions(uart_bridge PUBLIC LINE_CONTROL=1)
endif()
pico_add_extra_outputs(uart_bridge)

48
README.md
View file

@ -11,9 +11,45 @@ This software is provided without warranty, according to the MIT License, and sh
Raspberry Pi Pico Pinout
------------------------
| Raspberry Pi Pico GPIO | Function |
|:----------------------:|:--------:|
| GPIO0 (Pin 1) | UART0 TX |
| GPIO1 (Pin 2) | UART0 RX |
| GPIO4 (Pin 6) | UART1 TX |
| GPIO5 (Pin 7) | UART1 RX |
UART0:
| Raspberry Pi Pico GPIO | Function |
|:----------------------:|:---------:|
| GPIO0 (Pin 1) | TX |
| GPIO1 (Pin 2) | RX |
| GPIO2 (Pin 4) | CTS |
| GPIO3 (Pin 5) | RTS |
| GPIO4 (Pin 6) | DTR |
| GPIO5 (Pin 7) | DSR |
UART1:
| Raspberry Pi Pico GPIO | Function |
|:----------------------:|:---------:|
| GPIO8 (Pin 11) | TX |
| GPIO9 (Pin 12) | RX |
| GPIO10 (Pin 14) | CTS |
| GPIO11 (Pin 15) | RTS |
| GPIO12 (Pin 16) | DTR |
| GPIO13 (Pin 17) | DSR |
Optional Hardware Flow and Line control
------------------------------
Hardware Flow-control (RTS/CTS) is disabled by default, but can be compiled in by running:
``` bash
cmake -DFLOW_CONTROL .
make
```
Line control (DTR/DSR) is disabled by default, but can be compiled in by running:
``` bash
cmake -DLINE_CONTROL .
make
```
To enable both:
``` bash
cmake -DLINE_CONTROL -DFLOW_CONTROL .
make
```

53
uart-bridge.c
View file

@ -28,6 +28,14 @@ typedef struct {
uart_inst_t *const inst;
uint8_t tx_pin;
uint8_t rx_pin;
#ifdef FLOW_CONTROL
uint8_t rts_pin;
uint8_t cts_pin;
#endif
#ifdef LINE_CONTROL
uint8_t dtr_pin;
uint8_t dsr_pin;
#endif
} uart_id_t;
typedef struct {
@ -47,10 +55,26 @@ const uart_id_t UART_ID[CFG_TUD_CDC] = {
.inst = uart0,
.tx_pin = 0,
.rx_pin = 1,
#ifdef FLOW_CONTROL
.cts_pin = 2,
.rts_pin = 3,
#endif
#ifdef LINE_CONTROL
.dtr_pin = 4,
.dsr_pin = 5,
#endif
}, {
.inst = uart1,
.tx_pin = 4,
.rx_pin = 5,
.tx_pin = 8,
.rx_pin = 9,
#ifdef FLOW_CONTROL
.cts_pin = 10,
.rts_pin = 11,
#endif
#ifdef LINE_CONTROL
.dtr_pin = 12,
.dsr_pin = 13,
#endif
}
};
@ -233,6 +257,17 @@ void init_uart_data(uint8_t itf) {
/* Pinmux */
gpio_set_function(ui->tx_pin, GPIO_FUNC_UART);
gpio_set_function(ui->rx_pin, GPIO_FUNC_UART);
#ifdef FLOW_CONTROL
gpio_set_function(ui->rts_pin, GPIO_FUNC_UART);
gpio_set_function(ui->cts_pin, GPIO_FUNC_UART);
#endif
#ifdef LINE_CONTROL
gpio_init(ui->dtr_pin);
gpio_set_dir(ui->dtr_pin, GPIO_OUT);
gpio_init(ui->dsr_pin);
gpio_set_dir(ui->dsr_pin, GPIO_IN);
#endif
/* USB CDC LC */
ud->usb_lc.bit_rate = DEF_BIT_RATE;
@ -257,12 +292,26 @@ void init_uart_data(uint8_t itf) {
/* UART start */
uart_init(ui->inst, ud->usb_lc.bit_rate);
#ifdef FLOW_CONTROL
uart_set_hw_flow(ui->inst, true, true);
#else
uart_set_hw_flow(ui->inst, false, false);
#endif
uart_set_format(ui->inst, databits_usb2uart(ud->usb_lc.data_bits),
stopbits_usb2uart(ud->usb_lc.stop_bits),
parity_usb2uart(ud->usb_lc.parity));
}
#ifdef LINE_CONTROL
/* Invoked when line state has changed */
void tud_cdc_line_state_cb(uint8_t itf, bool dtr, bool rts)
{
const uart_id_t *ui = &UART_ID[itf];
gpio_put(ui->dtr_pin, dtr);
}
#endif
int main(void)
{
int itf;