BQ27421-G1: How to read Control() subcommands

Nikos Antoniou

Part Number: BQ27421-G1

Hi everyone,

I want to read Control() subcommads from BQ27421-G1. According to the Technical reference section 4.1, "Issuing a Control() command requires a subsequent 2-byte subcommand. But I do not understand how to to implemented in terms of software..

This is the function I'm using for standard commands

int8_t Acc_i2c_Read(uint8_t dev_id, uint8_t reg_addr, uint8_t *reg_data, uint16_t len) {
  int8_t rslt = 0;
  rslt = nrf_drv_twi_tx(&m_twi, dev_id, &reg_addr, 1, false);
  APP_ERROR_CHECK(rslt);

  if (rslt == 0) {
    rslt = nrf_drv_twi_rx(&m_twi, dev_id, reg_data, len);
  }
  return rslt;
}

How could I modified this function in order to read Control() subcommands?

over 5 years ago

0 Kang Kang over 5 years ago

TI__Mastermind 24870 points

Hello Nikos,

We do not debug source code here. Please refer to the many i2c drivers online.

0 Nikos Antoniou over 5 years ago in reply to Kang Kang

Intellectual 820 points

Hello Kang Kang and thank you for your responce.

Let me rephrase, I'm not asking for debugging. I do not understand paragraph 4.1"Issuing a Control() command requires a subseequent 2 byte subcommand".

For example, to read the CONTROL_STATUS subcommand what what sequence of write bytes must a transmit before reading the CONTROL_STATUS subcommand?

Thanks in advance

Nick

0 Kang Kang over 5 years ago in reply to Nikos Antoniou

TI__Mastermind 24870 points

Hello,

Yes, its two bytes. For example FW version would be 0x02 to 0x00 and 0x00 to 0x01.

Thanks!

0 Nikos Antoniou over 5 years ago in reply to Kang Kang

Intellectual 820 points

Thank you very much!! It works great!!

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BQ27421-G1: How to read Control() subcommands