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pico-uart-bridge
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Add hardware handshake

This commit is contained in:
Carsten Schmiemann 2023-12-31 21:43:58 +01:00
parent 93f66b01fc
commit afc635a053
1 changed files with 76 additions and 62 deletions
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138
uart-bridge.c
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@ -17,7 +17,7 @@
#define LED_PIN 25
#define BUFFER_SIZE 2560
#define BUFFER_SIZE 256
#define DEF_BIT_RATE 115200
#define DEF_STOP_BITS 1
@ -26,10 +26,16 @@
typedef struct {
uart_inst_t *const inst;
uint irq;
void *irq_fn;
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 {
@ -44,22 +50,31 @@ typedef struct {
mutex_t usb_mtx;
} uart_data_t;
void uart0_irq_fn(void);
void uart1_irq_fn(void);
const uart_id_t UART_ID[CFG_TUD_CDC] = {
{
.inst = uart0,
.irq = UART0_IRQ,
.irq_fn = &uart0_irq_fn,
.tx_pin = 16,
.rx_pin = 17,
.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,
.irq = UART1_IRQ,
.irq_fn = &uart1_irq_fn,
.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
}
};
@ -128,13 +143,14 @@ void update_uart_cfg(uint8_t itf)
mutex_exit(&ud->lc_mtx);
}
void usb_read_bytes(uint8_t itf)
{
uart_data_t *ud = &UART_DATA[itf];
void usb_read_bytes(uint8_t itf) {
uint32_t len = tud_cdc_n_available(itf);
if (len &&
mutex_try_enter(&ud->usb_mtx, NULL)) {
if (len) {
uart_data_t *ud = &UART_DATA[itf];
mutex_enter_blocking(&ud->usb_mtx);
len = MIN(len, BUFFER_SIZE - ud->usb_pos);
if (len) {
uint32_t count;
@ -147,17 +163,17 @@ void usb_read_bytes(uint8_t itf)
}
}
void usb_write_bytes(uint8_t itf)
{
void usb_write_bytes(uint8_t itf) {
uart_data_t *ud = &UART_DATA[itf];
if (ud->uart_pos &&
mutex_try_enter(&ud->uart_mtx, NULL)) {
if (ud->uart_pos) {
uint32_t count;
mutex_enter_blocking(&ud->uart_mtx);
count = tud_cdc_n_write(itf, ud->uart_buffer, ud->uart_pos);
if (count < ud->uart_pos)
memmove(ud->uart_buffer, &ud->uart_buffer[count],
memcpy(ud->uart_buffer, &ud->uart_buffer[count],
ud->uart_pos - count);
ud->uart_pos -= count;
@ -201,16 +217,16 @@ void core1_entry(void)
}
}
static inline void uart_read_bytes(uint8_t itf)
{
uart_data_t *ud = &UART_DATA[itf];
void uart_read_bytes(uint8_t itf) {
const uart_id_t *ui = &UART_ID[itf];
if (uart_is_readable(ui->inst)) {
uart_data_t *ud = &UART_DATA[itf];
mutex_enter_blocking(&ud->uart_mtx);
while (uart_is_readable(ui->inst) &&
(ud->uart_pos < BUFFER_SIZE)) {
ud->uart_pos < BUFFER_SIZE) {
ud->uart_buffer[ud->uart_pos] = uart_getc(ui->inst);
ud->uart_pos++;
}
@ -219,48 +235,39 @@ static inline void uart_read_bytes(uint8_t itf)
}
}
void uart0_irq_fn(void)
{
uart_read_bytes(0);
}
void uart1_irq_fn(void)
{
uart_read_bytes(1);
}
void uart_write_bytes(uint8_t itf)
{
void uart_write_bytes(uint8_t itf) {
uart_data_t *ud = &UART_DATA[itf];
if (ud->usb_pos &&
mutex_try_enter(&ud->usb_mtx, NULL)) {
if (ud->usb_pos) {
const uart_id_t *ui = &UART_ID[itf];
uint32_t count = 0;
while (uart_is_writable(ui->inst) &&
count < ud->usb_pos) {
uart_putc_raw(ui->inst, ud->usb_buffer[count]);
count++;
}
mutex_enter_blocking(&ud->usb_mtx);
if (count < ud->usb_pos)
memmove(ud->usb_buffer, &ud->usb_buffer[count],
ud->usb_pos - count);
ud->usb_pos -= count;
uart_write_blocking(ui->inst, ud->usb_buffer, ud->usb_pos);
ud->usb_pos = 0;
mutex_exit(&ud->usb_mtx);
}
}
void init_uart_data(uint8_t itf)
{
void init_uart_data(uint8_t itf) {
const uart_id_t *ui = &UART_ID[itf];
uart_data_t *ud = &UART_DATA[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;
@ -285,26 +292,32 @@ 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));
uart_set_fifo_enabled(ui->inst, false);
/* UART RX Interrupt */
irq_set_exclusive_handler(ui->irq, ui->irq_fn);
irq_set_enabled(ui->irq, true);
uart_set_irq_enables(ui->inst, true, false);
}
#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;
set_sys_clock_khz(250000, false);
usbd_serial_init();
for (itf = 0; itf < CFG_TUD_CDC; itf++)
init_uart_data(itf);
@ -316,6 +329,7 @@ int main(void)
while (1) {
for (itf = 0; itf < CFG_TUD_CDC; itf++) {
update_uart_cfg(itf);
uart_read_bytes(itf);
uart_write_bytes(itf);
}
}