Unable to configure GPO pin on ST25DV

[Shruthi]

Hi,

I'm trying to set the GPO static register to 0xF1 to get corresponding interrupts.

I am presenting the password first and then configuring GPO register at address 0000.

Here is the program-

NFCTAG_StatusTypeDef Set_GPO_reg(uint16_t flags)  // Here flags=0xF1
{
 
	ext_drv=BSP_NFCTAG_GetExtended_Drv();
 
	ST25DV_PASSWD pwd;
	ST25DV_I2CSSO_STATUS security_status;
 
	pwd.MsbPasswd=0x00000000;
	pwd.LsbPasswd=0x00000000;
 
	ext_drv->ReadI2CSecuritySession_Dyn(&security_status);
	ESP_LOGI("Security session","security session before presenting pwd is %d", security_status);
 
	while (ext_drv->PresentI2CPassword(pwd) != NFCTAG_OK);
 
	ext_drv->ReadI2CSecuritySession_Dyn(&security_status);
	ESP_LOGI("Security session","security session after presenting pwd is %d", security_status);
 
	while (BSP_NFCTAG_ConfigIT(condition) != NFCTAG_OK);
 
	return NFCTAG_OK;
}

I am reading security session before and after presenting password. I'm correctly seeing 0 and 1 respectively.

While the security session is open, I'm configuring GPO register with system address 0xAE and reg address-0x0000

I2C write operation is success. But after this, when I read the same static GPO register- ST25DV_i2c_GetGPOStatus(&GPOStatus), Im unable to see the configured 0xF1 value. I'm seeing as 0x11.

I'm unable to attach saleae file here. I can mail it though.

I referred to other answers as well - link1, link2

I'm using ST25DV04K 8pin IC. I have pulled up the GPO pin.

[JL. Lebon]

Hello Shruthi,

I don't see in your code where the "flags" value is used ?

What is the value of "condition" when you call BSP_NFCTAG_ConfigIT ?

It would probably help to see the saleae trace. I think this is possible, you should have the attach button available under the response window on the left of the answer button, no ?

Best regards.

[Shruthi]

Apologies for the mistake. Here 'condition' is same as 'flags' i.e., 0xF1

Here is the saleae trace. Password present starts from 3s:91ms.

[JL. Lebon · Accepted solution]

Hello Shruthi,

Sorry for the delay for answering and thank you for the salae trace.

Looking at the trace, I think I can see where the problem is.

At 3s and 129ms, I think you are trying to write into the GPO static register (address 0x0000). But the I2C command is not complete, the value 0xF1 is never sent. The command there is:

START/AE/ACK/00/ACK/00/ACK/STOP.

The correct command would be:

START/AE/ACK/00/ACK/00/ACK/F1/ACK/STOP

So it seems that you miss the part of the I2C sequence where the value 0xF1 is sent, this explains why the GPO register is not updated.

Best regards.