initial commit

2021-01-23 18:33:22 +01:00
commit 629df3473d
4 changed files with 905 additions and 0 deletions
--- a/main.c
+++ b/main.c
@@ -0,0 +1,64 @@
+#include <avr/io.h>
+#include <util/delay.h>
+#include <modbus.h>
+#include <avr/interrupt.h>
+
+volatile uint16_t holdingRegisters[4];
+void modbusGet(void);
+
+int main(){
+    DDRD |= (1 << 4); // LED
+    DDRD |= (1 << 3); // FU PWM
+    DDRD |= (1 << 2); // 485 DE
+
+	PORTD|=(1<<0); // RX
+
+    // FU PWM on PD3
+    OCR2B = 12;
+    TCCR2A |= (1 << COM2B1);
+    TCCR2A |= (1 << WGM21) | (1 << WGM20);
+    TCCR2B |= (1 << CS21);
+
+	sei();
+	modbusSetAddress(1);
+    modbusInit();
+
+    // Modbus Tick Timer
+    TCCR0B|=(1<<CS01); //prescaler 8
+	TIMSK0|=(1<<TOIE0);
+
+    while(1){
+        _delay_ms(10);
+        OCR2B += 1;
+	    modbusGet();
+    }
+}
+
+ISR(TIMER0_OVF_vect) { //this ISR is called 9765.625 times per second
+	modbusTickTimer();
+}
+
+void modbusGet(void) {
+	if (modbusGetBusState() & (1<<ReceiveCompleted))
+	{
+		switch(rxbuffer[1]) {
+            case fcReadHoldingRegisters:
+                modbusExchangeRegisters(holdingRegisters,0,4);
+                break;
+            case fcPresetSingleRegister:
+				modbusExchangeRegisters(holdingRegisters,0,4);
+			case fcPresetMultipleRegisters: 
+				modbusExchangeRegisters(holdingRegisters,0,4);
+                if(holdingRegisters[0])
+                    PORTD |= 1 << 4;
+                else
+                    PORTD &= ~(1 << 4);
+
+                break;
+            default:
+				modbusSendException(ecIllegalFunction);
+                break;
+		}
+	}
+}
+