Interface with ADC via I2C (ADC Part No: TLA2528)

[GMano.1]

Hai..,

We are using a custom board with STM32H743IIT6 soldered to it. For our application, we need more Analog Inputs so we have used TLA2528 chip. Below is the code for it..

tx_buf[0] = TLA2528_PIN_CFG;
  tx_buf[1] = 0x00;
  HAL_I2C_Master_Transmit(&hi2c4, TLA2528_I2C_ADDR, tx_buf, 2, HAL_MAX_DELAY);
  tx_buf[0] = 0x10;
  tx_buf[1] = 0x00;
  HAL_I2C_Master_Transmit(&hi2c4, TLA2528_I2C_ADDR, tx_buf, 2, HAL_MAX_DELAY);
  tx_buf[0] = TLA2528_CHL_SEL;
  tx_buf[1] = 0x00;
  HAL_I2C_Master_Transmit(&hi2c4, TLA2528_I2C_ADDR, tx_buf, 2, HAL_MAX_DELAY);
  tx_buf[0] = 0x01;
  tx_buf[1] = 0x08;
  HAL_I2C_Master_Transmit(&hi2c4, TLA2528_I2C_ADDR, tx_buf, 2, HAL_MAX_DELAY);


HAL_Delay(20);
HAL_I2C_Master_Receive(&hi2c4, TLA2528_I2C_ADDR | 0x01 ,rx_buf, 2, HAL_MAX_DELAY);
result = (rx_buf[0] << 8 | rx_buf[1] );

While Debugging we could only get the value as "0x00". Could you please help us with this issue?

we have attached the TLA2528 Datasheet below for your reference.

Thanks & Regards

M. Govind. 

[mƎALLEm]

Hello,

In next time please use </> button to share your code. See How to insert source code.

I've edited your post.

Thank you for your understanding.

[TDK]

Does HAL_I2C_IsDeviceReady return HAL_OK? Start there.

[Andrew Neil]

Please provide more details - see How to write your question to maximize your chances to find a solution.

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@GMano.1 wrote:

We are using a custom board

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Therefore you need to post the schematic.

Does it have correct pullups?

Have you used an oscilloscope to check that the signals are good ?

Have you an analyser to check that the bus transactions are correct ?

Are you even getting an ACK from the device? HAL_I2C_IsDeviceReady will check this, as @TDK suggested.

BTW: rather than use magic numbers, named symbolic symbols would make your code easier to read & maintain.

TI provide a header file on their Product Page:

https://www.ti.com/product/TLA2528#design-development:~:text=SUPPORT%20SOFTWARE,C%20Header%20File

[Andrew Neil]

The datasheet says that a read should look like this: