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Send correct data in 441 message

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This commit is contained in:
Fredrik 2025-08-20 11:23:22 +02:00
parent 10a60abd1a
commit 0f647978fa
1 changed files with 21 additions and 4 deletions
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25
Software/src/battery/BYD-ATTO-3-BATTERY.cpp
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@ -136,6 +136,16 @@ uint16_t estimateSOCstandard(uint16_t packVoltage) { // Linear interpolation fu
return 0; // Default return for safety, should never reach here
}
uint8_t compute441Checksum(const uint8_t* u8) // Computes the 441 checksum byte
{
int sum = 0;
for (int i = 0; i < 7; ++i) {
sum += u8[i];
}
uint8_t lsb = static_cast<uint8_t>(sum & 0xFF);
return static_cast<uint8_t>(~lsb & 0xFF);
}
void BydAttoBattery::
update_values() { //This function maps all the values fetched via CAN to the correct parameters used for modbus
@ -532,10 +542,17 @@ void BydAttoBattery::transmit_can(unsigned long currentMillis) {
}
if (counter_100ms > 3) {
ATTO_3_441.data.u8[4] = 0x9D;
ATTO_3_441.data.u8[5] = 0x01;
ATTO_3_441.data.u8[6] = 0xFF;
ATTO_3_441.data.u8[7] = 0xF5;
if (battery_voltage > 0){
ATTO_3_441.data.u8[4] = (uint8_t)(battery_voltage - 1);
ATTO_3_441.data.u8[5] = ((battery_voltage - 1) >> 8);
ATTO_3_441.data.u8[6] = 0xFF;
ATTO_3_441.data.u8[7] = compute441Checksum(ATTO_3_441.data.u8);
} else {
ATTO_3_441.data.u8[4] = 0x0C;
ATTO_3_441.data.u8[5] = 0x00;
ATTO_3_441.data.u8[6] = 0xFF;
ATTO_3_441.data.u8[7] = 0x87;
}
}
transmit_can_frame(&ATTO_3_441);