judsonupchurch/nanoMODBUS
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Fixes to arduino examples

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This commit is contained in:
Valerio De Benedetto 2022-06-04 14:16:43 +02:00
parent 2a149a93ec
commit 7045813f8b
3 changed files with 15 additions and 16 deletions
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2
examples/arduino/README.md
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@ -2,3 +2,5 @@
This folder contains nanoMODBUS examples for Arduino. This folder contains nanoMODBUS examples for Arduino.
To build and load a sketch with the Arduino IDE, copy `nanomodbus.c` and `nanomodbus.h` inside its folder. To build and load a sketch with the Arduino IDE, copy `nanomodbus.c` and `nanomodbus.h` inside its folder.
`client-rtu` and `server-rtu` are meant to be used with two Arduinos connected via their TX0/RX0 serial pins.

8
examples/arduino/client-rtu/client-rtu.ino
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@ -33,7 +33,7 @@ void onError() {
void setup() { void setup() {
pinMode (LED_BUILTIN, OUTPUT); pinMode (LED_BUILTIN, OUTPUT);
digitalWrite(LED_BUILTIN, HIGH); digitalWrite(LED_BUILTIN, LOW);
Serial.begin(9600); Serial.begin(9600);
while (!Serial); while (!Serial);
@ -82,9 +82,9 @@ void loop() {
if (err != NMBS_ERROR_NONE) if (err != NMBS_ERROR_NONE)
onError(); onError();
// Turn off the led on success // On success, keep the led on
digitalWrite(LED_BUILTIN, LOW); digitalWrite(LED_BUILTIN, HIGH);
// No need to destroy the nmbs instance, bye bye // No need to destroy the nmbs instance, terminate the program
exit(0); exit(0);
} }

19
examples/arduino/server-rtu/server-rtu.ino
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@ -1,5 +1,5 @@
/* /*
This example application sets up an RTU server and polls from modbus requests This example application sets up an RTU server and handles modbus requests
This server supports the following function codes: This server supports the following function codes:
FC 01 (0x01) Read Coils FC 01 (0x01) Read Coils
@ -35,12 +35,9 @@ int32_t write_serial(const uint8_t* buf, uint16_t count, int32_t byte_timeout_ms
void onError() { void onError() {
// Make the LED blink on error // Set the led ON on error
while (true) { while (true) {
digitalWrite(LED_BUILTIN, HIGH); digitalWrite(LED_BUILTIN, HIGH);
delay(1000);
digitalWrite(LED_BUILTIN, LOW);
delay(1000);
} }
} }
@ -98,7 +95,6 @@ nmbs_error handle_write_multiple_registers(uint16_t address, uint16_t quantity,
void setup() { void setup() {
pinMode (LED_BUILTIN, OUTPUT); pinMode (LED_BUILTIN, OUTPUT);
digitalWrite(LED_BUILTIN, HIGH);
Serial.begin(9600); Serial.begin(9600);
while (!Serial); while (!Serial);
@ -112,7 +108,6 @@ void loop() {
platform_conf.write = write_serial; platform_conf.write = write_serial;
platform_conf.arg = NULL; platform_conf.arg = NULL;
// These functions are defined in server.h
nmbs_callbacks callbacks = {0}; nmbs_callbacks callbacks = {0};
callbacks.read_coils = handle_read_coils; callbacks.read_coils = handle_read_coils;
callbacks.write_multiple_coils = handle_write_multiple_coils; callbacks.write_multiple_coils = handle_write_multiple_coils;
@ -129,16 +124,18 @@ void loop() {
nmbs_set_read_timeout(&nmbs, 1000); nmbs_set_read_timeout(&nmbs, 1000);
nmbs_set_byte_timeout(&nmbs, 100); nmbs_set_byte_timeout(&nmbs, 100);
bool led = false;
while (true) { while (true) {
err = nmbs_server_poll(&nmbs); err = nmbs_server_poll(&nmbs);
// This will probably never happen, since we don't return < 0 in our platform funcs // This will probably never happen, since we don't return < 0 in our platform funcs
if (err == NMBS_ERROR_TRANSPORT) if (err == NMBS_ERROR_TRANSPORT)
break; break;
digitalWrite(LED_BUILTIN, led);
led = !led;
} }
// Turn off the led at the end // No need to destroy the nmbs instance, terminate the program
digitalWrite(LED_BUILTIN, LOW);
// No need to destroy the nmbs instance, bye bye
exit(0); exit(0);
} }