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Merge pull request #1444 from freddanastrom/imporvement/BYD-Atto3-send-voltage

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BYD Atto 3: Send correct data in 441 message
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Daniel Öster 2025-08-26 16:09:49 +03:00 • committed by GitHub
commit 94cd2a3309
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2 changed files with 23 additions and 4 deletions
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24
Software/src/battery/BYD-ATTO-3-BATTERY.cpp
View file

@ -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
@ -383,6 +393,7 @@ void BydAttoBattery::handle_incoming_can_frame(CAN_frame rx_frame) {
datalayer_battery->status.CAN_battery_still_alive = CAN_STILL_ALIVE;
battery_voltage = ((rx_frame.data.u8[1] & 0x0F) << 8) | rx_frame.data.u8[0];
//battery_temperature_something = rx_frame.data.u8[7] - 40; resides in frame 7
BMS_voltage_available = true;
break;
case 0x445:
datalayer_battery->status.CAN_battery_still_alive = CAN_STILL_ALIVE;
@ -532,10 +543,17 @@ 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;
if (BMS_voltage_available) { // Transmit battery voltage back to BMS when confirmed it's available, this closes the contactors
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] = 0xF5;
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);

1
Software/src/battery/BYD-ATTO-3-BATTERY.h
View file

@ -98,6 +98,7 @@ class BydAttoBattery : public CanBattery {
unsigned long previousMillis100 = 0; // will store last time a 100ms CAN Message was send
unsigned long previousMillis200 = 0; // will store last time a 200ms CAN Message was send
bool SOC_method = false;
bool BMS_voltage_available = false;
uint8_t counter_50ms = 0;
uint8_t counter_100ms = 0;
uint8_t frame6_counter = 0xB;