Error in establishing communication between ADT7410 and nRF52840.

[Ashu@2000]

Hey hi,

I am trying to establish communication between ADT7410 and nRF52840 using I2C that is the TWI module.

I have successfully checked the address of the ADT7410 with nRF52840.

The output of so is as follow:

00> <info> app: Application Started
00>
00> <info> app: Entered the twi_init loop
00>
00> <info> app: twi is been initalized
00>
00> <info> app: error_code is : 0x0
00>
00> <info> app: Successfully detected a device at address : 0x48
00>

But unable to get the temperature value from the sensor.

Tried debugging through NRF_LOG_INFO

the program doesn't print "The Error code 2 is %x" from the ADT7410_set_mode.

ADT7410_set_mode function is as follow:

void ADT7410_set_mode(void)
{
NRF_LOG_INFO("We have entered ADT7410 set mode");
NRF_LOG_FLUSH();
ret_code_t err_code;

/* Writing to LM75B_REG_CONF "0" set temperature sensor in NORMAL mode. */
uint8_t reg[2] = {ADT7410_REG_CONF, NORMAL_MODE};
err_code = nrf_drv_twi_tx(&m_twi, ADT7410_ADDR, reg, sizeof(reg), false);
APP_ERROR_CHECK(err_code);
NRF_LOG_INFO("The Error code 1 is %x",err_code);
NRF_LOG_FLUSH();
while (m_xfer_done == false);

/* Writing to pointer byte. */
reg[0] = ADT7410_REG_TEMP;
m_xfer_done = false;
err_code = nrf_drv_twi_tx(&m_twi, ADT7410_ADDR, reg,1, false);
APP_ERROR_CHECK(err_code);
NRF_LOG_INFO("The Error code 2 is %x",err_code);
NRF_LOG_FLUSH();
while (m_xfer_done == false);
}

Please do guide me to solve this issue.

[Ashu@2000]

I have posted the complete code previously only, just specifying the part of it.

There is an error while setting the configuration or while asking for temperature value because there specific NRF_LOG_INFO are not getting print on RTT.

Till that point, everything is getting perfectly print on RTT.

[awneil]

always post code using 'Insert code', otherwise it appears as a mess - as in your recent post.

Ashu@2000 said:

There is an error

What error, exactly?

Step through the code -using the debugger - to see exactly what is happening

[Ashu@2000]

Debugger stops at 51st line of the code which is while  "(m_xfer_done == false);".

Which simply signifies that the transfer is not taking place properly.

I have tried my best to read the ADT7410 datasheet, don't know if miss something.

Any possible guidance will be very helpful.

[awneil]

Ashu@2000 said:

signifies that the transfer is not taking place properly

Specifically, that m_xfer_done is never getting set to true.

So check your code to see where it should get set to true - is that code ever called?

Again, you really need to see what's happening on the wires - is there any activity at all? if there is, is it correct? etc, etc ... ?

[Ashu@2000]

There is no activity on the wire, I have checked that using DSO.

In SHT21 there was SCL and SDA signal that was passed to SHT21 by nRF52840, but SHT21 was not responding. There was a small burst of signal, which I use to hold and then expand in DSO.

Whereas here there are no signals that are coming out of nRF52840.