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This commit is contained in:
Rémi Heredero 2023-03-14 15:25:45 +01:00
parent f23af037a5
commit a19b554ecb
1 changed files with 33 additions and 15 deletions
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48
modbus.c
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@ -43,30 +43,44 @@ void modbus_timer(void)
extern uint16_t measure_voltage();
uint8_t modbus_analyse_and_answer(void) {
// TODO -> complete the modbus analyse and answer
uint8_t length = 0;
uint16_t length = 0;
if(rx_buf[0] == modbusAddress){
tx_buf[0] = rx_buf[0]; // Adress
tx_buf[1] = rx_buf[1]; // Function
uint16_t adresseRegister = ((uint16_t)rx_buf[2] << 8) | rx_buf[3];
switch(rx_buf[1]){
switch(rx_buf[1]){ // Check the function from rx buffer
case READ_INPUT_REGISTERS:
tx_buf[2] = 2; // Data length
tx_buf[4] = input_registers[0]; // LSB Data
tx_buf[3] = input_registers[0]>>8; // MSB Data
length = 5;
// todo choose register
length = ((uint16_t)rx_buf[4] << 8) | rx_buf[5];
tx_buf[2] = (uint8_t)(length*2); // Data length
for(uint16_t i = 0; i < length; i++){ // Data
tx_buf[i*2+4] = input_registers[adresseRegister+i];
tx_buf[i*2+3] = (input_registers[adresseRegister+i] >> 8);
}
length*=2;
length+=3;
break;
case READ_HOLDING_REGISTERS:
//todo
length = ((uint16_t)rx_buf[4] << 8) | rx_buf[5];
tx_buf[2] = (uint8_t)(length*2); // Data length
for(uint16_t i = 0; i < length; i++){ // Data
tx_buf[i*2+4] = holding_registers[adresseRegister+i];
tx_buf[i*2+3] = (holding_registers[adresseRegister+i] >> 8);
}
length*=2;
length+=3;
break;
case WRITE_SINGLE_REGISTER:
//todo
holding_registers[adresseRegister] = ((uint16_t)rx_buf[4] << 8) | rx_buf[5];
for (int i = 2; i <= 5; i++) {
tx_buf[i] = rx_buf[i];
length = i+1;
}
break;
// todo CRC
}
}
rx_buf[0] = 0;
modbus_send(length);
@ -82,19 +96,23 @@ void modbus_char_recvd(void)
void modbus_send(uint8_t length)
{
uint16_t temp16;
uint8_t i;
uint16_t crc = CRC16(tx_buf, length);
tx_buf[length] = crc;
tx_buf[length+1] = crc >> 8;
// TODO -> complete modbus crc calculation
length += 2; // add 2 CRC bytes for total size
// For all the bytes to be transmitted
uart_send(tx_buf,length);
for (uint8_t i = 0; i < length; i++){
EUSART1_Write(tx_buf[i]);
}
}
void modbus_init(uint8_t address)
{
modbusAddress = address;
holding_registers[1] = address;
EUSART1_SetRxInterruptHandler(modbus_char_recvd);
TMR0_SetInterruptHandler(modbus_timer);
}