examples/platform/esp32/pw_sys_io/sys_io_esp32.cc

/*
 *
 *    Copyright (c) 2021 Project CHIP Authors
 *
 *    Licensed under the Apache License, Version 2.0 (the "License");
 *    you may not use this file except in compliance with the License.
 *    You may obtain a copy of the License at
 *
 *        http://www.apache.org/licenses/LICENSE-2.0
 *
 *    Unless required by applicable law or agreed to in writing, software
 *    distributed under the License is distributed on an "AS IS" BASIS,
 *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *    See the License for the specific language governing permissions and
 *    limitations under the License.
 */

#include "argtable3/argtable3.h"
#include "driver/uart.h"
#include "esp_console.h"
#include "esp_err.h"
#include "esp_log.h"
#include "esp_system.h"
#include "esp_vfs_dev.h"
#include "esp_vfs_fat.h"
#include "linenoise/linenoise.h"
#include "pw_sys_io/sys_io.h"
#include <cassert>
#include <cinttypes>
#include <stdio.h>
#include <string.h>

#define ECHO_TEST_TXD (CONFIG_EXAMPLE_UART_TXD)
#define ECHO_TEST_RXD (CONFIG_EXAMPLE_UART_RXD)
#define ECHO_TEST_RTS (UART_PIN_NO_CHANGE)
#define ECHO_TEST_CTS (UART_PIN_NO_CHANGE)

#define ECHO_UART_PORT_NUM (CONFIG_EXAMPLE_UART_PORT_NUM)
#define ECHO_UART_BAUD_RATE (CONFIG_EXAMPLE_UART_BAUD_RATE)

int console_getchar(uint8_t * chr)
{
    return uart_read_bytes(ECHO_UART_PORT_NUM, chr, 1, portMAX_DELAY);
}

int console_putchar(const char * chr)
{
    return uart_write_bytes(ECHO_UART_PORT_NUM, chr, 1);
}

void console_init(void)
{
    /* Configure parameters of an UART driver,
     * communication pins and install the driver */
    uart_config_t uart_config = {
        .baud_rate  = ECHO_UART_BAUD_RATE,
        .data_bits  = UART_DATA_8_BITS,
        .parity     = UART_PARITY_DISABLE,
        .stop_bits  = UART_STOP_BITS_1,
        .flow_ctrl  = UART_HW_FLOWCTRL_DISABLE,
        .source_clk = UART_SCLK_APB,
    };
    int intr_alloc_flags = 0;

    ESP_ERROR_CHECK(uart_driver_install(ECHO_UART_PORT_NUM, 256, 0, 0, NULL, intr_alloc_flags));
    ESP_ERROR_CHECK(uart_param_config(ECHO_UART_PORT_NUM, &uart_config));
    ESP_ERROR_CHECK(uart_set_pin(ECHO_UART_PORT_NUM, ECHO_TEST_TXD, ECHO_TEST_RXD, ECHO_TEST_RTS, ECHO_TEST_CTS));

    return;
}

extern "C" void pw_sys_io_Init()
{
    console_init();
}

namespace pw::sys_io {

Status ReadByte(std::byte * dest)
{
    if (!dest)
        return Status::InvalidArgument();

    int ret = console_getchar(reinterpret_cast<uint8_t *>(dest));
    return ret < 0 ? Status::FailedPrecondition() : OkStatus();
}

Status WriteByte(std::byte b)
{
    int ret = console_putchar(reinterpret_cast<const char *>(&b));
    return ret < 0 ? Status::FailedPrecondition() : OkStatus();
}

// Writes a string using pw::sys_io, and add newline characters at the end.
StatusWithSize WriteLine(const std::string_view & s)
{
    size_t chars_written  = 0;
    StatusWithSize result = WriteBytes(pw::as_bytes(pw::span(s)));
    if (!result.ok())
    {
        return result;
    }
    chars_written += result.size();
    result = WriteBytes(pw::as_bytes(pw::span("\r\n", 2)));
    chars_written += result.size();

    return StatusWithSize(result.status(), chars_written);
}

} // namespace pw::sys_io