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modbus_loadcell
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Eggert Jung 3 years ago
parent ec757f57f8
commit 0ba716fb3e
1 changed files with 16 additions and 27 deletions
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43
code/main.c
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@ -7,12 +7,7 @@
uint16_t holdingRegisters[4]; uint16_t holdingRegisters[4];
void timer0100us_start(void) { // return raw ADC data
TCCR0B|=(1<<CS01); //prescaler 8
TIMSK0|=(1<<TOIE0);
}
//Return raw ADC data
uint32_t HX711_get_data(uint8_t clk_PIN, uint8_t data_PIN, uint8_t gain_for_next_conv){ uint32_t HX711_get_data(uint8_t clk_PIN, uint8_t data_PIN, uint8_t gain_for_next_conv){
uint32_t data = 0; uint32_t data = 0;
for(uint8_t i = 0; i < 24; i++){ //Start 24bit transmission for(uint8_t i = 0; i < 24; i++){ //Start 24bit transmission
@ -63,29 +58,24 @@ uint32_t HX711_get_data(uint8_t clk_PIN, uint8_t data_PIN, uint8_t gain_for_next
} }
void modbusGet(void) { void modbusGet(void) {
if (modbusGetBusState() & (1<<ReceiveCompleted)) if (modbusGetBusState() & (1<<ReceiveCompleted))
{ {
switch(rxbuffer[1]) { switch(rxbuffer[1]) {
case fcReadHoldingRegisters: case fcReadHoldingRegisters:
PORTC ^= 1 << 1; PORTC ^= 1 << 1; // toggle led
// _delay_ms(10);
// PORTC &= ~(1 << 1);
while(PINB & (1<<4)); // wait for data ready while(PINB & (1<<4)); // wait for data ready
uint32_t tmp = HX711_get_data(3, 4, 128); uint32_t tmp = HX711_get_data(3, 4, 128);
//int32_t tmp = -1000;
holdingRegisters[0] = tmp & 0xFFFF; holdingRegisters[0] = tmp & 0xFFFF;
holdingRegisters[1] = (tmp>>16) & 0xFFFF; holdingRegisters[1] = (tmp>>16) & 0xFFFF;
modbusExchangeRegisters(holdingRegisters,0,4); modbusExchangeRegisters(holdingRegisters,0,4);
break; break;
default:
default: { modbusSendException(ecIllegalFunction);
modbusSendException(ecIllegalFunction); break;
} }
break; }
}
}
} }
int main(void){ int main(void){
@ -96,13 +86,12 @@ int main(void){
modbusInit(); modbusInit();
sei(); sei();
timer0100us_start(); /* modbus tick timer */
TCCR0B|=(1<<CS01);
TIMSK0|=(1<<TOIE0);
while(1){ while(1){
modbusGet(); modbusGet();
//PORTC ^= 1 << 0;
//_delay_ms(100);
//PORTC &= ~(1 << 1);
} }
} }