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add modbus

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This commit is contained in:
Eggert Jung
2022-10-09 07:00:15 +02:00
parent 49e31df61f
commit ae9d0e48e3
2 changed files with 68 additions and 11 deletions
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4
Makefile
View File

@@ -11,8 +11,8 @@ TOOL = stk500 -P /dev/ttyUSB0
BUILDDIR = Builds BUILDDIR = Builds
DEFINES = -I . -IInternet/MQTT -I Internet/MQTT/MQTTPacket/src -I Ethernet/W5500 -I Ethernet -DF_CPU=16000000UL -D_WIZCHIP_=W5100 DEFINES = -DF_CPU=16000000UL
CFLAGS =-mmcu=$(MCU) -O2 -Wall -Wpedantic $(DEFINES) -std=c99 -ffunction-sections -fdata-sections CFLAGS =-mmcu=$(MCU) -O2 -Wall -Wpedantic $(DEFINES) -std=c99 -ffunction-sections -fdata-sections
LDFLAGS =-mmcu=$(MCU) -Wl,--gc-sections LDFLAGS =-mmcu=$(MCU) -Wl,--gc-sections

75
main.c
View File

@@ -3,6 +3,8 @@
#include <stdint.h> #include <stdint.h>
#include <util/delay.h> #include <util/delay.h>
#include "yaMBSiavr.h"
uint8_t font[] = { uint8_t font[] = {
0xEE, 0xEE,
0x82, 0x82,
@@ -17,6 +19,7 @@ uint8_t font[] = {
}; };
uint8_t display[4]; uint8_t display[4];
volatile uint16_t holdingRegisters[4];
void timer0_init() void timer0_init()
{ {
@@ -26,21 +29,71 @@ void timer0_init()
TIMSK |= 1<<OCIE0; //IRQ on TIMER0 output compareA TIMSK |= 1<<OCIE0; //IRQ on TIMER0 output compareA
} }
void timer2_init(void) {
//TCCR2 = (1<<WGM21); //TIMER0 SET-UP: CTC MODE
//TCCR2 = (1<<CS21)|(1<<CS20); // PS 1:64
//OCR2 = 25; // 1ms reach for clear (16mz:64=>250kHz:250-=>1kHz)
//TIMSK |= 1<<OCIE2; //IRQ on TIMER0 output compareA
TCCR2|=(1<<CS21); //prescaler 8
TIMSK|=(1<<TOIE2);
}
unsigned long bin2bcd (uint32_t n) // convert 16 bit binary n to 5 digit BCD (packed)
{
return n + 6 * (n/10 + 16*(n/100) + 256*(n/1000) + 4096*(n/10000));
}
void modbusGet(void) {
if (modbusGetBusState() & (1<<ReceiveCompleted))
{
switch(rxbuffer[1]) {
case fcReadHoldingRegisters:
modbusExchangeRegisters(holdingRegisters,0,4);
break;
case fcPresetMultipleRegisters:
modbusExchangeRegisters(holdingRegisters,0,1);
uint8_t h = holdingRegisters[0] / 3600;
uint8_t m = (holdingRegisters[0] / 60) % 60;
uint8_t s = holdingRegisters[0] % 60;
uint16_t bcd;
if(h)
bcd = bin2bcd(m) | bin2bcd(h)<<8;
else
bcd = bin2bcd(s) | bin2bcd(m)<<8;
display[0] = font[(bcd&0x000f)];
display[1] = font[(bcd&0x00f0) >> 4];
display[2] = font[(bcd&0x0f00) >> 8];
display[3] = bcd&0xF000 ? font[(bcd&0xf000) >> 12] : 0;
break;
default:
modbusSendException(ecIllegalFunction);
break;
}
}
}
int main(void){ int main(void){
DDRB |= _BV(3) | _BV(2) | _BV(1) | _BV(0); DDRB |= _BV(4) | _BV(3) | _BV(2) | _BV(1) | _BV(0);
DDRD = 0xFC; DDRD = 0xFC;
DDRA = 0x03 << 4; DDRA = 0x03 << 4;
DDRC = 0xFE; DDRC = 0xFE;
display[3] = font[1]; modbusSetAddress(24); //better set this to sth.
display[2] = font[3]; modbusInit();
display[1] = font[3];
display[0] = font[7];
timer0_init(); timer0_init();
timer2_init();
sei(); sei();
while(1){ while(1){
modbusGet();
} }
} }
@@ -48,15 +101,19 @@ int main(void){
ISR(TIMER0_COMP_vect) ISR(TIMER0_COMP_vect)
{ {
if(PORTB & 0x01){ if(PORTB & 0x01){
PORTB = 1<<1 | 1<<3; PORTB = (PORTB & 0xF0) | 1<<1 | 1<<3;
PORTD = display[3] & 0xFC; PORTD = display[3] & 0xFC;
PORTA = (display[3] & 0x03) << 4; PORTA = (PORTA & 0xCF) | (display[3] & 0x03) << 4;
PORTC = display[1]; PORTC = display[1];
} }
else{ else{
PORTB = 1<<0 | 1<<2; PORTB = (PORTB & 0xF0) | 1<<0 | 1<<2;
PORTD = display[2] & 0xFC; PORTD = display[2] & 0xFC;
PORTA = (display[2] & 0x03) << 4; PORTA = (PORTA & 0xCF) | (display[2] & 0x03) << 4;
PORTC = display[0]; PORTC = display[0];
} }
} }
ISR(TIMER2_OVF_vect) { //this ISR is called 9765.625 times per second
modbusTickTimer();
}