hf_fdo2_esp_uart.hpp

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#pragma once
 
#include "fdo2.hpp"
 
#include "driver/uart.h"
#include "esp_err.h"
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
 
#include <cstddef>
#include <cstdint>
 
namespace hf_fdo2_examples {
 
template <uart_port_t kPort, int kTxGpio, int kRxGpio, std::uint32_t kBaud = fdo2::kFdo2G2DefaultBaud,
          int kRxBufBytes = 2048, int kTxBufBytes = 0>
class Fdo2EspIdfUart : public fdo2::UartInterface<Fdo2EspIdfUart<kPort, kTxGpio, kRxGpio, kBaud, kRxBufBytes, kTxBufBytes>> {
public:
    static esp_err_t Install() noexcept {
        uart_config_t uart_cfg = {};
        uart_cfg.baud_rate           = static_cast<int>(kBaud);
        uart_cfg.data_bits           = UART_DATA_8_BITS;
        uart_cfg.parity              = UART_PARITY_DISABLE;
        uart_cfg.stop_bits           = UART_STOP_BITS_1;
        uart_cfg.flow_ctrl           = UART_HW_FLOWCTRL_DISABLE;
        uart_cfg.rx_flow_ctrl_thresh = 0;
        uart_cfg.source_clk          = UART_SCLK_DEFAULT;
        esp_err_t err = uart_driver_install(kPort, kRxBufBytes, kTxBufBytes, 0, nullptr, 0);
        if (err != ESP_OK) {
            return err;
        }
        err = uart_param_config(kPort, &uart_cfg);
        if (err != ESP_OK) {
            return err;
        }
        err = uart_set_pin(kPort, kTxGpio, kRxGpio, UART_PIN_NO_CHANGE, UART_PIN_NO_CHANGE);
        return err;
    }
 
    void write(const std::uint8_t* data, std::size_t len) noexcept {
        if (len > 0) {
            (void)uart_write_bytes(kPort, data, static_cast<int>(len));
        }
    }
 
    std::size_t read(std::uint8_t* out, std::size_t max, std::uint32_t timeout_ms) noexcept {
        const int n = uart_read_bytes(kPort, out, static_cast<int>(max), pdMS_TO_TICKS(timeout_ms));
        return (n < 0) ? 0U : static_cast<std::size_t>(n);
    }
 
    void flush_rx() noexcept { uart_flush_input(kPort); }
 
    void delay_ms_impl(std::uint32_t ms) noexcept { vTaskDelay(pdMS_TO_TICKS(ms)); }
};
 
}  // namespace hf_fdo2_examples