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blackmagic-esp32-s2/components/simple-uart/simple-uart.c

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#include <driver/gpio.h>
#include <driver/periph_ctrl.h>
#include <hal/uart_ll.h>
#include <hal/uart_hal.h>
#include <hal/gpio_hal.h>
#include <esp_rom_gpio.h>
#include "simple-uart.h"
/***********************************************/
typedef struct {
uart_hal_context_t hal; /*!< UART hal context*/
uint8_t uart_index;
void* isr_context;
uart_isr rx_isr;
} uart_context_t;
#define UART_CONTEX_INIT_DEF(uart_num) \
{ \
.hal.dev = UART_LL_GET_HW(uart_num), .uart_index = uart_num, .isr_context = NULL, \
.rx_isr = NULL \
}
static uart_context_t uart_context[UART_NUM_MAX] = {
UART_CONTEX_INIT_DEF(UART_NUM_0),
UART_CONTEX_INIT_DEF(UART_NUM_1),
#if UART_NUM_MAX > 2
UART_CONTEX_INIT_DEF(UART_NUM_2),
#endif
};
#define UART_HAL(uart_num) &(uart_context[uart_num].hal)
/***********************************************/
#define UART_FIFO_LIMIT (UART_LL_FIFO_DEF_LEN)
#define UART_TX_FIFO_THRESH 0x1
#define UART_RX_FIFO_THRESH 0x16
static void simple_uart_isr(void* arg);
static void simple_uart_init_pins(uint8_t uart_num, int tx_pin_num, int rx_pin_num) {
if(tx_pin_num >= 0) {
gpio_hal_iomux_func_sel(GPIO_PIN_MUX_REG[tx_pin_num], PIN_FUNC_GPIO);
gpio_set_level(tx_pin_num, 1);
esp_rom_gpio_connect_out_signal(
tx_pin_num, UART_PERIPH_SIGNAL(uart_num, SOC_UART_TX_PIN_IDX), 0, 0);
}
if(rx_pin_num >= 0) {
gpio_hal_iomux_func_sel(GPIO_PIN_MUX_REG[rx_pin_num], PIN_FUNC_GPIO);
gpio_set_pull_mode(rx_pin_num, GPIO_PULLUP_ONLY);
gpio_set_direction(rx_pin_num, GPIO_MODE_INPUT);
esp_rom_gpio_connect_in_signal(
rx_pin_num, UART_PERIPH_SIGNAL(uart_num, SOC_UART_RX_PIN_IDX), 0);
}
}
static void simple_uart_init_module(uint8_t uart_num) {
periph_module_enable(uart_periph_signal[uart_num].module);
periph_module_reset(uart_periph_signal[uart_num].module);
}
void simple_uart_init(UartConfig* cfg) {
uart_context[cfg->uart_num].rx_isr = cfg->rx_isr;
uart_context[cfg->uart_num].isr_context = cfg->isr_context;
simple_uart_init_pins(cfg->uart_num, cfg->tx_pin_num, cfg->rx_pin_num);
simple_uart_init_module(cfg->uart_num);
uart_hal_set_sclk(UART_HAL(cfg->uart_num), UART_SCLK_APB);
uart_hal_set_rxfifo_full_thr(UART_HAL(cfg->uart_num), UART_RX_FIFO_THRESH);
uart_hal_set_txfifo_empty_thr(UART_HAL(cfg->uart_num), UART_TX_FIFO_THRESH);
uart_hal_rxfifo_rst(UART_HAL(cfg->uart_num));
uart_hal_set_hw_flow_ctrl(UART_HAL(cfg->uart_num), UART_HW_FLOWCTRL_DISABLE, 0);
uart_hal_set_rx_timeout(UART_HAL(cfg->uart_num), 0x16);
simple_uart_set_baud_rate(cfg->uart_num, cfg->baud_rate);
simple_uart_set_stop_bits(cfg->uart_num, cfg->stop_bits);
simple_uart_set_parity(cfg->uart_num, cfg->parity);
simple_uart_set_data_bits(cfg->uart_num, cfg->data_bits);
esp_intr_alloc(
uart_periph_signal[cfg->uart_num].irq,
0,
simple_uart_isr,
&uart_context[cfg->uart_num],
NULL);
// disable interrupts
uart_hal_clr_intsts_mask(UART_HAL(cfg->uart_num), UART_INTR_RXFIFO_FULL);
uart_hal_clr_intsts_mask(UART_HAL(cfg->uart_num), UART_INTR_TXFIFO_EMPTY);
uart_hal_clr_intsts_mask(UART_HAL(cfg->uart_num), UART_INTR_PARITY_ERR);
uart_hal_clr_intsts_mask(UART_HAL(cfg->uart_num), UART_INTR_FRAM_ERR);
uart_hal_clr_intsts_mask(UART_HAL(cfg->uart_num), UART_INTR_RXFIFO_OVF);
uart_hal_clr_intsts_mask(UART_HAL(cfg->uart_num), UART_INTR_DSR_CHG);
uart_hal_clr_intsts_mask(UART_HAL(cfg->uart_num), UART_INTR_CTS_CHG);
uart_hal_clr_intsts_mask(UART_HAL(cfg->uart_num), UART_INTR_BRK_DET);
uart_hal_clr_intsts_mask(UART_HAL(cfg->uart_num), UART_INTR_RXFIFO_TOUT);
uart_hal_clr_intsts_mask(UART_HAL(cfg->uart_num), UART_INTR_SW_XON);
uart_hal_clr_intsts_mask(UART_HAL(cfg->uart_num), UART_INTR_SW_XOFF);
uart_hal_clr_intsts_mask(UART_HAL(cfg->uart_num), UART_INTR_GLITCH_DET);
uart_hal_clr_intsts_mask(UART_HAL(cfg->uart_num), UART_INTR_TX_BRK_DONE);
uart_hal_clr_intsts_mask(UART_HAL(cfg->uart_num), UART_INTR_TX_BRK_IDLE);
uart_hal_clr_intsts_mask(UART_HAL(cfg->uart_num), UART_INTR_TX_DONE);
uart_hal_clr_intsts_mask(UART_HAL(cfg->uart_num), UART_INTR_RS485_PARITY_ERR);
uart_hal_clr_intsts_mask(UART_HAL(cfg->uart_num), UART_INTR_RS485_FRM_ERR);
uart_hal_clr_intsts_mask(UART_HAL(cfg->uart_num), UART_INTR_RS485_CLASH);
uart_hal_clr_intsts_mask(UART_HAL(cfg->uart_num), UART_INTR_CMD_CHAR_DET);
// enable rx interrupts
uart_hal_ena_intr_mask(UART_HAL(cfg->uart_num), UART_INTR_RXFIFO_FULL);
uart_hal_ena_intr_mask(UART_HAL(cfg->uart_num), UART_INTR_RXFIFO_TOUT);
}
void simple_uart_write(uint8_t uart_num, const uint8_t* data, const uint32_t data_size) {
uint32_t to_write = data_size;
while(to_write > 0) {
while(uart_hal_get_txfifo_len(UART_HAL(uart_num)) == 0) {
; /* Wait */
}
uint32_t write_size = 0;
uart_hal_write_txfifo(
UART_HAL(uart_num), data + (data_size - to_write), to_write, &write_size);
to_write -= write_size;
}
}
bool simple_uart_available(uint8_t uart_num) {
const int num_rx = uart_hal_get_rxfifo_len(UART_HAL(uart_num));
return num_rx > 0;
}
uint32_t simple_uart_read(uint8_t uart_num, uint8_t* data, const uint32_t data_size) {
const int num_rx = uart_hal_get_rxfifo_len(UART_HAL(uart_num));
int read = ((data_size) < (num_rx) ? (data_size) : (num_rx));
if(!read) {
return 0;
}
uart_hal_read_rxfifo(UART_HAL(uart_num), data, &read);
return read;
}
static void simple_uart_isr(void* arg) {
uart_context_t* context = arg;
uart_hal_context_t* hal_context = &context->hal;
uint8_t hal_num = context->uart_index;
uint32_t uart_intr_status = uart_hal_get_intsts_mask(hal_context);
if(uart_intr_status == 0) {
return;
}
uart_hal_clr_intsts_mask(hal_context, uart_intr_status);
if(uart_intr_status & UART_INTR_TXFIFO_EMPTY) {
}
if((uart_intr_status & UART_INTR_RXFIFO_TOUT) || (uart_intr_status & UART_INTR_RXFIFO_FULL)) {
if(context->rx_isr) {
context->rx_isr(context->isr_context);
} else {
// purge rx fifo
uint8_t data;
while(simple_uart_available(hal_num)) {
simple_uart_read(hal_num, &data, 1);
}
}
}
}
void simple_uart_set_baud_rate(uint8_t uart_num, uint32_t baud_rate) {
uart_hal_set_baudrate(UART_HAL(uart_num), baud_rate);
}
void simple_uart_set_stop_bits(uint8_t uart_num, uart_stop_bits_t stop_bits) {
uart_hal_set_stop_bits(UART_HAL(uart_num), stop_bits);
}
void simple_uart_set_parity(uint8_t uart_num, uart_parity_t parity) {
uart_hal_set_parity(UART_HAL(uart_num), parity);
}
void simple_uart_set_data_bits(uint8_t uart_num, uart_word_length_t data_bits) {
uart_hal_set_data_bit_num(UART_HAL(uart_num), data_bits);
}
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