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Add line control (DTR/DSR)

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DSR doesn't do anything yet.
This commit is contained in:
Jonathan Rico 2022-10-22 12:26:41 +02:00
parent e729db5942
commit feac173c52
3 changed files with 69 additions and 14 deletions
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4
CMakeLists.txt
View file

@ -25,4 +25,8 @@ 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)

42
README.md
View file

@ -11,23 +11,45 @@ This software is provided without warranty, according to the MIT License, and sh
Raspberry Pi Pico Pinout
------------------------
UART0:
| Raspberry Pi Pico GPIO | Function |
|:----------------------:|:---------:|
| GPIO0 (Pin 1) | UART0 TX |
| GPIO1 (Pin 2) | UART0 RX |
| GPIO2 (Pin 4) | UART0 CTS |
| GPIO3 (Pin 5) | UART0 RTS |
| GPIO4 (Pin 6) | UART1 TX |
| GPIO5 (Pin 7) | UART1 RX |
| GPIO6 (Pin 9) | UART1 CTS |
| GPIO7 (Pin 10) | UART1 RTS |
| GPIO0 (Pin 1) | TX |
| GPIO1 (Pin 2) | RX |
| GPIO2 (Pin 4) | CTS |
| GPIO3 (Pin 5) | RTS |
| GPIO4 (Pin 6) | DTR |
| GPIO5 (Pin 7) | DSR |
Optional Hardware Flow-control
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 is disabled by default, but can be compiled in by running:
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
```

37
uart-bridge.c
View file

@ -32,6 +32,10 @@ typedef struct {
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 {
@ -54,14 +58,22 @@ const uart_id_t UART_ID[CFG_TUD_CDC] = {
#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 = 6,
.rts_pin = 7,
.cts_pin = 10,
.rts_pin = 11,
#endif
#ifdef LINE_CONTROL
.dtr_pin = 12,
.dsr_pin = 13,
#endif
}
};
@ -250,6 +262,13 @@ void init_uart_data(uint8_t itf) {
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;
ud->usb_lc.data_bits = DEF_DATA_BITS;
@ -283,6 +302,16 @@ void init_uart_data(uint8_t itf) {
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;