第一次提交：完成了网关的单路485数据采集，还有以太网链接和MQTT配置，实现数据上报和命令下发，差一个断网储存
This commit is contained in:
Wang Beihong
4
components/RS-485-SP3485EEN/CMakeLists.txt
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4
components/RS-485-SP3485EEN/CMakeLists.txt
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idf_component_register(SRCS "RS-485-SP3485EEN.c"
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INCLUDE_DIRS "include"
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REQUIRES nvs_flash driver MQTT_ESP mqtt STATUS_LED MODBUS_ESP json
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)
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311
components/RS-485-SP3485EEN/RS-485-SP3485EEN.c
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311
components/RS-485-SP3485EEN/RS-485-SP3485EEN.c
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#include "RS-485-SP3485EEN.h"
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#include <esp_log.h>
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#include "MQTT_ESP.h"
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#include "STATUS_LED.h"
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#include "MODBUS_ESP.h"
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#include "cJSON.h"
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#define TAG "RS485_DRIVER"
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// Timeout threshold for UART = number of symbols (~10 tics) with unchanged state on receive pin
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#define ECHO_READ_TOUT (3) // 3.5T * 8 = 28 ticks, TOUT=3 -> ~24..33 ticks
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// ----------------------------
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// 通道数组定义
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// ----------------------------
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rs485_channel_t rs485_channels[] = {
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{RS_485_SP3485EEN_UART_PORT, RS_485_SP3485EEN_DI_PIN, RS_485_SP3485EEN_RO_PIN, RS_485_SP3485EEN_DE_RE_PIN, "RS485-1"},
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{RS_485_SP3485EEN_2_UART_PORT, RS_485_SP3485EEN_2_DI_PIN, RS_485_SP3485EEN_2_RO_PIN, RS_485_SP3485EEN_2_DE_RE_PIN, "RS485-2"}};
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// ============================
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// UART 发送函数
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// ============================
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void rs485_send(uart_port_t uart_num, const uint8_t *data, size_t len)
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{
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if (data == NULL || len == 0)
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{
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ESP_LOGW(TAG, "rs485_send: empty payload");
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return;
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}
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// 清空 RX，防止残留帧污染
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uart_flush_input(uart_num);
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// 发送数据
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int written = uart_write_bytes(uart_num, (const char *)data, len);
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if (written < 0)
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{
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ESP_LOGE(TAG, "UART%d TX write error (%d)", uart_num, written);
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return;
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}
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if ((size_t)written != len)
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{
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ESP_LOGW(TAG, "UART%d TX partial (%d/%d)", uart_num, written, len);
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}
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// RS485 半双工模式下，uart_write_bytes 会自动等待发送完成
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// 这里只需要等待一个额外的延时确保所有数据都已发送完成
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// 根据波特率和字节数计算传输时间（11位/字节：1起始位+8数据位+1停止位+1奇偶校验位）
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uint32_t transmit_time_ms = (len * 11 * 1000) / (BAUD_RATE > 0 ? BAUD_RATE : 1);
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vTaskDelay(pdMS_TO_TICKS(transmit_time_ms + 5));
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// Modbus RTU 3.5T 帧间静默（保留短延时）
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vTaskDelay(pdMS_TO_TICKS(5));
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ESP_LOGI(TAG, "UART%d TX done (%d bytes)", uart_num, written);
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}
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// ============================
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// UART 接收函数
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// ============================
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int rs485_receive(uart_port_t uart_num, uint8_t *buffer, size_t buf_size, uint32_t timeout_ms)
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{
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if (buffer == NULL || buf_size == 0)
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{
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ESP_LOGW(TAG, "rs485_receive: invalid buffer");
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return -1;
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}
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int len = uart_read_bytes(uart_num, buffer, buf_size, pdMS_TO_TICKS(timeout_ms));
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if (len > 0)
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{
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ESP_LOGI(TAG, "UART%d RX (%d bytes)", uart_num, len);
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// 不在这里打印数据，交由调用者（task）处理，避免重复日志
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}
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else if (len == 0)
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{
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ESP_LOGD(TAG, "UART%d RX timeout", uart_num);
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}
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else
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{
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ESP_LOGW(TAG, "UART%d RX error (%d)", uart_num, len);
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}
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return len;
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}
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// ============================
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// RS485 初始化函数
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// ============================
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void RS_485_init(uart_port_t uart_num, int tx_pin, int rx_pin, int de_re_pin)
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{
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uart_config_t uart_config = {
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.baud_rate = BAUD_RATE,
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.data_bits = UART_DATA_8_BITS,
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.parity = UART_PARITY_DISABLE,
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.stop_bits = UART_STOP_BITS_1,
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.flow_ctrl = UART_HW_FLOWCTRL_DISABLE,
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.source_clk = UART_SCLK_DEFAULT,
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.rx_flow_ctrl_thresh = 122,
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};
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ESP_ERROR_CHECK(uart_driver_install(
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uart_num,
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BUF_SIZE * 2,
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BUF_SIZE * 2,
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0,
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NULL,
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0));
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ESP_ERROR_CHECK(uart_param_config(uart_num, &uart_config));
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ESP_ERROR_CHECK(uart_set_pin(
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uart_num,
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tx_pin,
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rx_pin,
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de_re_pin,
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UART_PIN_NO_CHANGE));
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ESP_ERROR_CHECK(uart_set_mode(uart_num, UART_MODE_RS485_HALF_DUPLEX));
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ESP_ERROR_CHECK(uart_set_rx_timeout(uart_num, ECHO_READ_TOUT));
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ESP_LOGI(TAG,
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"RS485 init OK: UART%d TX=%d RX=%d DE/RE=%d",
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uart_num, tx_pin, rx_pin, de_re_pin);
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}
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// ============================
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// 初始化指定RS485通道
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// ============================
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void init_specific_rs485_channel(int channel_num)
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{
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if (channel_num < 0 || channel_num >= NUM_CHANNELS)
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{
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ESP_LOGE(TAG, "Invalid channel number: %d", channel_num);
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return;
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}
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rs485_channel_t *ch = &rs485_channels[channel_num];
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// 初始化RS485硬件
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RS_485_init(ch->uart_num, ch->tx_pin, ch->rx_pin, ch->de_re_pin);
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ESP_LOGI(TAG, "Channel %d: %s (UART%d) initialized",
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channel_num, ch->name, ch->uart_num);
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}
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// ============================
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// 初始化所有RS485通道
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// ============================
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void init_all_rs485_channels(void)
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{
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ESP_LOGI(TAG, "Initializing %d RS485 channels", NUM_CHANNELS);
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for (int i = 0; i < NUM_CHANNELS; i++)
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{
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init_specific_rs485_channel(i);
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}
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}
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/* 接收任务：参数为通道索引 (int cast via intptr_t) */
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static void rs485_rx_task(void *arg)
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{
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int channel = (int)(intptr_t)arg;
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if (channel < 0 || channel >= NUM_CHANNELS)
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{
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ESP_LOGE(TAG, "rs485_rx_task: invalid channel %d", channel);
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vTaskDelete(NULL);
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return;
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}
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rs485_channel_t *ch = &rs485_channels[channel];
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/* 使用堆分配，避免栈溢出 */
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uint8_t *buf = malloc(BUF_SIZE);
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if (buf == NULL)
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{
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ESP_LOGE(TAG, "rs485_rx_task: malloc failed");
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vTaskDelete(NULL);
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return;
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}
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ESP_LOGI(TAG, "%s RX task started", ch->name);
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while (1)
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{
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int len = rs485_receive(ch->uart_num, buf, BUF_SIZE, 100); // 100ms timeout for Modbus
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if (len > 0)
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{
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// 数据接收成功，LED2 短暂亮起表示有数据
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status_led_set(2, 1);
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ESP_LOGI(TAG, "%s UART%d RX (%d bytes)", ch->name, ch->uart_num, len);
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ESP_LOG_BUFFER_HEX(TAG, buf, len);
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// 尝试解析MODBUS响应
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modbus_response_t response;
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if (modbus_parse_response(buf, len, &response))
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{
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// MODBUS解析成功，构建JSON格式数据
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cJSON *root = cJSON_CreateObject();
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if (root != NULL)
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{
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// 添加基本信息
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cJSON_AddStringToObject(root, "channel", ch->name);
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cJSON_AddNumberToObject(root, "slave_addr", response.slave_addr);
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cJSON_AddNumberToObject(root, "function_code", response.function_code);
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if (response.is_exception)
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{
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// 异常响应
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cJSON_AddStringToObject(root, "status", "exception");
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cJSON_AddNumberToObject(root, "exception_code", response.exception_code);
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ESP_LOGW(TAG, "Modbus exception response: code=0x%02X", response.exception_code);
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}
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else
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{
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// 正常响应
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cJSON_AddStringToObject(root, "status", "success");
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cJSON_AddNumberToObject(root, "byte_count", response.byte_count);
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cJSON_AddNumberToObject(root, "register_count", response.register_count);
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// 添加寄存器数组
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cJSON *reg_array = cJSON_CreateArray();
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if (reg_array != NULL)
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{
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for (uint8_t i = 0; i < response.register_count; i++)
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{
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cJSON_AddItemToArray(reg_array, cJSON_CreateNumber(response.registers[i]));
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}
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cJSON_AddItemToObject(root, "registers", reg_array);
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}
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ESP_LOGI(TAG, "Modbus response parsed: slave=%d, func=0x%02X, regs=%d",
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response.slave_addr, response.function_code, response.register_count);
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}
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// 转换为JSON字符串
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char *json_str = cJSON_Print(root);
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if (json_str != NULL)
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{
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// 发布JSON数据到MQTT
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int ret = mqtt_publish_message(CONFIG_MQTT_PUB_TOPIC, json_str, strlen(json_str), 0, 0);
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if (ret < 0)
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{
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ESP_LOGW(TAG, "Failed to publish Modbus JSON to MQTT topic %s", CONFIG_MQTT_PUB_TOPIC);
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}
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else
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{
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ESP_LOGI(TAG, "Published Modbus JSON to MQTT topic %s, msg_id: %d", CONFIG_MQTT_PUB_TOPIC, ret);
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ESP_LOGD(TAG, "JSON payload: %s", json_str);
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}
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free(json_str);
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}
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cJSON_Delete(root);
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}
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// 释放响应中的寄存器内存
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modbus_free_response(&response);
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}
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else
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{
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// MODBUS解析失败，原始数据直接上报
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ESP_LOGW(TAG, "Failed to parse Modbus frame, publishing raw data");
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int ret = mqtt_publish_message(CONFIG_MQTT_PUB_TOPIC, (char *)buf, len, 0, 0);
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if (ret < 0)
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{
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ESP_LOGW(TAG, "Failed to publish RS485 data to MQTT topic %s", CONFIG_MQTT_PUB_TOPIC);
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}
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}
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vTaskDelay(pdMS_TO_TICKS(50)); // 保持亮起50ms
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status_led_blink_mode(2, 2); // 恢复心跳模式
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}
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else if (len == 0)
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{
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vTaskDelay(pdMS_TO_TICKS(50)); // 无数据短延时
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}
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else
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{
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// 接收错误，不记录日志避免刷屏
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vTaskDelay(pdMS_TO_TICKS(200));
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}
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}
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/* 永久任务通常不会到这里；若退出则释放 */
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free(buf);
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vTaskDelete(NULL);
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}
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/* 启动单个通道的接收任务
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返回 pdPASS 或 pdFAIL */
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BaseType_t start_rs485_rx_task_for_channel(int channel_num, UBaseType_t priority, uint32_t stack_size)
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{
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if (channel_num < 0 || channel_num >= NUM_CHANNELS)
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{
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ESP_LOGE(TAG, "start_rs485_rx_task_for_channel: invalid channel %d", channel_num);
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return pdFAIL;
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}
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char tname[16];
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snprintf(tname, sizeof(tname), "rs485_rx_%d", channel_num);
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return xTaskCreate(rs485_rx_task, tname, stack_size, (void *)(intptr_t)channel_num, priority, NULL);
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}
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/* 可选：启动所有通道的接收任务（示例默认优先级与栈）*/
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void start_all_rs485_rx_tasks(UBaseType_t priority, uint32_t stack_size)
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{
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for (int i = 0; i < NUM_CHANNELS; i++)
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{
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if (start_rs485_rx_task_for_channel(i, priority, stack_size) != pdPASS)
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{
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ESP_LOGW(TAG, "Failed to start RX task for channel %d", i);
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}
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else
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{
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ESP_LOGI(TAG, "Started RX task for channel %d", i);
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}
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}
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}
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66
components/RS-485-SP3485EEN/include/RS-485-SP3485EEN.h
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66
components/RS-485-SP3485EEN/include/RS-485-SP3485EEN.h
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@@ -0,0 +1,66 @@
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// RS-485-SP3485EEN.h
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include "freertos/FreeRTOS.h"
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#include "freertos/task.h"
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#include "esp_system.h"
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#include "nvs_flash.h"
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#include "driver/uart.h"
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#include "freertos/queue.h"
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#include "esp_log.h"
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#include "driver/gpio.h"
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typedef struct
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{
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uart_port_t uart_num;
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gpio_num_t tx_pin;
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gpio_num_t rx_pin;
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gpio_num_t de_re_pin;
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char name[20];
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} rs485_channel_t;
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/**
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* @brief RS-485-SP3485EEN.h
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* DE和RE引脚接在一起使用，默认是下拉，通过控制DE_RE引脚的高低电平来控制发送和接收
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* DE_RE = HIGH 发送数据，接收器使能，低电平有效。低电平时使能接收器，高电平时禁用接收器
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* DE_RE = LOW 接收数据，驱动器（发送器）使能，高电平有效。高电平时使能发送器，低电平时禁用发送器
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*
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* 所以默认是接收状态，发送数据时需要先将DE_RE引脚拉高，发送完数据后再拉低
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*/
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// 第一个模块的引脚配置
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#define RS_485_SP3485EEN_UART_PORT (UART_NUM_0)
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#define RS_485_SP3485EEN_RO_PIN (GPIO_NUM_41) // 接收器输出。将总线上的差分信号转换为TTL电平，输出给 单片机RX
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#define RS_485_SP3485EEN_DE_RE_PIN (GPIO_NUM_42) // 数据使能,接收器使能。控制发送器和接收器是否工作
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#define RS_485_SP3485EEN_DI_PIN (GPIO_NUM_44) // 驱动器输入。单片机TX 发送的TTL电平信号，转换为总线上的差分信号
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// 第二个模块的引脚配置
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#define RS_485_SP3485EEN_2_UART_PORT (UART_NUM_2)
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#define RS_485_SP3485EEN_2_RO_PIN (GPIO_NUM_43) // 接收器输出。将总线上的差分信号转换为TTL电平，输出给 单片机RX
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#define RS_485_SP3485EEN_2_DE_RE_PIN (GPIO_NUM_2) // 数据使能,接收器使能。控制发送器和接收器是否工作
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#define RS_485_SP3485EEN_2_DI_PIN (GPIO_NUM_1) // 驱动器输入。单片机TX 发送的TTL电平信号，转换为总线上的差分信号
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// 公共配置
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#define BUF_SIZE 256
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#define BAUD_RATE 115200
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// 通道数量常量
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#define RS485_NUM_CHANNELS 2
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// ----------------------------
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// 通道数组
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// ----------------------------
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extern rs485_channel_t rs485_channels[];
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#define NUM_CHANNELS RS485_NUM_CHANNELS
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void RS_485_init(uart_port_t uart_num, int tx_pin, int rx_pin, int de_re_pin);
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void init_specific_rs485_channel(int channel_num); // 新增函数声明
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void init_all_rs485_channels(void);
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void rs485_send(uart_port_t uart_num, const uint8_t *data, size_t len);
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int rs485_receive(uart_port_t uart_num, uint8_t *buffer, size_t buf_size, uint32_t timeout_ms);
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BaseType_t start_rs485_rx_task_for_channel(int channel_num, UBaseType_t priority, uint32_t stack_size);
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