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+--- Thread: Modbus (/showthread.php?tid=6597)
Modbus - charles.garand - 09-04-2024
Hi!
anybody had implement Modbus ?
I'm having hard time to get mine working.
I'm using esp32ModbusRTU library.
here is my code;
esp32ModbusRTU modbus(&Serial1, -1);
void modbusTask(void *pvParameters) {
Serial1.begin(4800, SERIAL_8N1, RX, TX);
printf("Serial1 initialized for Modbus\n");
vTaskDelay(pdMS_TO_TICKS(1000));
// callbacks Modbus
modbus.onData([](uint8_t serverAddress, esp32Modbus::FunctionCode fc, uint8_t* data, size_t length) {
printf("Modbus Response Received - Server ID: 0x%02x, Function Code: 0x%02x, Length: %u\n", serverAddress, fc, length);
for (size_t i = 0; i < length; ++i) {
printf("%02x ", data[i]);
}
printf("\n");
});
modbus.onError([](esp32Modbus::Error error) {
printf("Modbus Error: 0x%02x\n", static_cast<uint8_t>(error));
});
modbus.begin();
vTaskDelay(pdMS_TO_TICKS(1000));
while (true) {
modbus.readHoldingRegisters(0x01, 0x0000, 4);
//vTaskDelay(pdMS_TO_TICKS(1000));
}
}
extern "C" void app_main(void)
{
vTaskDelay(6000 / portTICK_PERIOD_MS);
printf("Hello world!\n");
xTaskCreate(modbusTask, "modbusTask", 8192, NULL, 5, NULL);
while (true) {
std::cout << "In the while\n" << std::endl;
//vTaskDelay(pdMS_TO_TICKS(1000));
}
}
...
#include <esp32ModbusRTU.h>
#include "driver/uart.h"
// Declaration Modbus
esp32ModbusRTU modbus(&Serial1, 10); // 10 is arbitary GPIO because don't use RTS pin
void modbusTask(void *pvParameters) {
// Configurer la communication UART pour Modbus
Serial1.begin(4800, SERIAL_8N1, RX, TX); // Initialise Serial1
printf("Serial1 initialized for Modbus\n");
vTaskDelay(pdMS_TO_TICKS(1000)); // stabilisation time
// Configurer les callbacks de Modbus
modbus.onData([](uint8_t serverAddress, esp32Modbus::FunctionCode fc, uint8_t* data, size_t length) {
printf("Modbus Response Received - Server ID: 0x%02x, Function Code: 0x%02x, Length: %u\n", serverAddress, fc, length);
if (length % 2 != 0) {
printf("Invalid data length\n");
return;
}
for (size_t i = 0; i < length; i += 2) {
uint16_t value = (data[i] << 8) | data[i + 1];
if(i < 5)
value = value / 10;
printf("Register %zu: %u \n", i / 2, value);
}
printf("\n");
});
modbus.onError([](esp32Modbus::Error error) {
printf("Modbus Error: 0x%02x\n", static_cast<uint8_t>(error));
});
// start Modbus
modbus.begin();
vTaskDelay(pdMS_TO_TICKS(1000)); // wait 1 sec to stabilise
while (true) {
modbus.readHoldingRegisters(0x01, 0x0000, 5); // slave address: 0x01
vTaskDelay(pdMS_TO_TICKS(1000));
}
}
extern "C" void app_main(void)
{
xTaskCreate(modbusTask, "modbusTask", 8192, NULL, 5, NULL);
while (true) {
std::cout << "In the while\n" << std::endl;
vTaskDelay(pdMS_TO_TICKS(2000));
}
}