91 lines
2.1 KiB
C++
91 lines
2.1 KiB
C++
/*
|
|
This example client application connects via RTU to a server and sends some requests to it.
|
|
*/
|
|
|
|
#include "nanomodbus.h"
|
|
|
|
// The server address
|
|
#define RTU_SERVER_ADDRESS 1
|
|
|
|
|
|
int32_t read_serial(uint8_t* buf, uint16_t count, int32_t byte_timeout_ms, void* arg) {
|
|
Serial.setTimeout(byte_timeout_ms);
|
|
return Serial.readBytes(buf, count);
|
|
}
|
|
|
|
|
|
int32_t write_serial(const uint8_t* buf, uint16_t count, int32_t byte_timeout_ms, void* arg) {
|
|
Serial.setTimeout(byte_timeout_ms);
|
|
return Serial.write(buf, count);
|
|
}
|
|
|
|
|
|
void onError() {
|
|
// Make the LED blink on error
|
|
while (true) {
|
|
digitalWrite(LED_BUILTIN, HIGH);
|
|
delay(1000);
|
|
digitalWrite(LED_BUILTIN, LOW);
|
|
delay(1000);
|
|
}
|
|
}
|
|
|
|
|
|
void setup() {
|
|
pinMode (LED_BUILTIN, OUTPUT);
|
|
digitalWrite(LED_BUILTIN, LOW);
|
|
|
|
Serial.begin(9600);
|
|
while (!Serial);
|
|
}
|
|
|
|
|
|
void loop() {
|
|
nmbs_platform_conf platform_conf;
|
|
platform_conf.transport = NMBS_TRANSPORT_RTU;
|
|
platform_conf.read = read_serial;
|
|
platform_conf.write = write_serial;
|
|
|
|
nmbs_t nmbs;
|
|
nmbs_error err = nmbs_client_create(&nmbs, &platform_conf);
|
|
if (err != NMBS_ERROR_NONE)
|
|
onError();
|
|
|
|
nmbs_set_read_timeout(&nmbs, 1000);
|
|
nmbs_set_byte_timeout(&nmbs, 100);
|
|
|
|
nmbs_set_destination_rtu_address(&nmbs, RTU_SERVER_ADDRESS);
|
|
|
|
// Write 2 coils from address 64
|
|
nmbs_bitfield coils;
|
|
nmbs_bitfield_write(coils, 0, 1);
|
|
nmbs_bitfield_write(coils, 1, 1);
|
|
err = nmbs_write_multiple_coils(&nmbs, 64, 2, coils);
|
|
if (err != NMBS_ERROR_NONE)
|
|
onError();
|
|
|
|
// Read 3 coils from address 64
|
|
nmbs_bitfield_reset(coils); // Reset whole bitfield to zero
|
|
err = nmbs_read_coils(&nmbs, 64, 3, coils);
|
|
if (err != NMBS_ERROR_NONE)
|
|
onError();
|
|
|
|
// Write 2 holding registers at address 26
|
|
uint16_t w_regs[2] = {123, 124};
|
|
err = nmbs_write_multiple_registers(&nmbs, 26, 2, w_regs);
|
|
if (err != NMBS_ERROR_NONE)
|
|
onError();
|
|
|
|
// Read 2 holding registers from address 26
|
|
uint16_t r_regs[2];
|
|
err = nmbs_read_holding_registers(&nmbs, 26, 2, r_regs);
|
|
if (err != NMBS_ERROR_NONE)
|
|
onError();
|
|
|
|
// On success, keep the led on
|
|
digitalWrite(LED_BUILTIN, HIGH);
|
|
|
|
// No need to destroy the nmbs instance, terminate the program
|
|
exit(0);
|
|
}
|