Below is code I am using to write to the BLOCKDATA area in a BQ27425. The code seems to work correctly up to the RESET. The problem is that when I do the SOFT_RESET clear the CFGUPDATE flag, the BQ27425 returns a BUSY (not the expected OK).
I have also tried a HARD_RESET rather than a SOFT_RESET and even waited 240seconds without doing a reset. None of these three options solve the BUSY problem.
Can you suggest a sequence that allows me write to the BLOCKDATA area in a BQ27425 without getting a BUSY return when to clear the CFGUPDATE flag?
HAL_StatusTypeDef WriteDataBlock (uint8_t CLASS, uint8_t OFFSET, uint8_t Init, uint8_t u8WriteBytes, bool toNVM)
{
HAL_StatusTypeDef HalReturn = HAL_NOP;
uint8_t UnSealReturn;
uint8_t i8Sum, x, u8Dummy;
uint8_t u8LocalWriteBuffer[32] = {0x00};
uint8_t u8LocalReadBuffer[36] = {0x00}; //Little Endian
uint8_t u8CheckSumBuffer[10] = {0x00};
//To update a Data Block the bq must be in CFGUPDATE mode
if ((HalReturn = WriteStandardInfo(CONTROL, SET_CFGUPDATE, &u8Dummy)) == HAL_OK)
{
if (ReadStandardInfo(FLAGS, NO_CNTL_FNCT, u8LocalReadBuffer, 2) == HAL_OK)
//LoByte = OCVTAKEN / RSVD / ITPOR / CFGUPMODE // BAT_DET / SOC1 / SOCF / DSG
if ((u8LocalReadBuffer[0] & 0x10) != 0x10) //check CFGUPMODE = true
return HAL_ERROR;
}
//Put the Class and Offset, of the BlockData to be accessed, into BlockData and BlockData+1
u8LocalWriteBuffer[0] = DATACLASS; //DATACLASS = 0x3E;
u8LocalWriteBuffer[1] = CLASS; //e.g., 0x52;
u8LocalWriteBuffer[2] = (OFFSET / 32); //BLOCK_#: 0, 1, 2, etc.;
HalReturn = I2C_Master_Transmit(&hi2c1, 0xAA, u8LocalWriteBuffer, 3, BQ27425_TIMEOUT);
//Write BLOCKDATACONTROL(0x61) & 0x00
u8LocalWriteBuffer[0] = BLOCKDATACONTROL; //0x61;
u8LocalWriteBuffer[1] = 0x00; //0x00;
HalReturn = I2C_Master_Transmit(&hi2c1, 0xAA, u8LocalWriteBuffer, 2, BQ27425_TIMEOUT);
//Write the bytes of the designated WriteBuffer[] to the BLOCKDATA at addresses 0x40 - 0x5F
if (Init == true)
{
HalReturn = I2C_Mem_Write(&hi2c1, 0xAA, BLOCKDATA, 1, u8GasGaugeStateInit, 32, BQ27425_TIMEOUT); //u8WriteBytes
}
if (toNVM)
{
//Compute the CheckSum of the 32-bytes just written to the DataBlock at 0x40 - 0x5F
i8Sum = 0x00;
for (x=0; x<32; ++x)
i8Sum += u8LocalWriteBuffer[x];
u8CheckSumBuffer[0] = 0xFF - i8Sum; //compute 1's complement of the CheckSum
//Write the CheckSum to BLOCKDATACHECKSUM
HalReturn = I2C_Mem_Write(&hi2c1, 0xAA, BLOCKDATACHECKSUM, 1, u8CheckSumBuffer, 1, BQ27425_TIMEOUT);
}
//Clear the CFGUPDATE flag
HalReturn = WriteStandardInfo(CONTROL, SOFT_RESET, u8CheckSumBuffer);
Delay(0x100); //100ms
return HalReturn;
}
