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65 lines
1.4 KiB
C
65 lines
1.4 KiB
C
#include <avr/io.h>
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#include <util/delay.h>
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#include <modbus.h>
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#include <avr/interrupt.h>
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volatile uint16_t holdingRegisters[4];
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void modbusGet(void);
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int main(){
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DDRD |= (1 << 4); // LED
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DDRD |= (1 << 3); // FU PWM
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DDRD |= (1 << 2); // 485 DE
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PORTD|=(1<<0); // RX
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// FU PWM on PD3
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OCR2B = 12;
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TCCR2A |= (1 << COM2B1);
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TCCR2A |= (1 << WGM21) | (1 << WGM20);
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TCCR2B |= (1 << CS21);
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sei();
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modbusSetAddress(1);
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modbusInit();
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// Modbus Tick Timer
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TCCR0B|=(1<<CS01); //prescaler 8
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TIMSK0|=(1<<TOIE0);
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while(1){
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_delay_ms(10);
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OCR2B += 1;
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modbusGet();
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}
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}
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ISR(TIMER0_OVF_vect) { //this ISR is called 9765.625 times per second
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modbusTickTimer();
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}
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void modbusGet(void) {
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if (modbusGetBusState() & (1<<ReceiveCompleted))
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{
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switch(rxbuffer[1]) {
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case fcReadHoldingRegisters:
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modbusExchangeRegisters(holdingRegisters,0,4);
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break;
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case fcPresetSingleRegister:
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modbusExchangeRegisters(holdingRegisters,0,4);
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case fcPresetMultipleRegisters:
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modbusExchangeRegisters(holdingRegisters,0,4);
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if(holdingRegisters[0])
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PORTD |= 1 << 4;
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else
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PORTD &= ~(1 << 4);
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break;
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default:
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modbusSendException(ecIllegalFunction);
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break;
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}
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}
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}
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