topic Re: Regarding reading data from NT3H2111 in NFC

Regarding reading data from NT3H2111

shank — Mon, 21 Apr 2025 12:07:24 GMT

Hello.
I am trying to implement RFID using NXP's NT3H2211W0FT1. The microcontroller I am using is the STM32C031F6.
After powering on the board, the first thing I do is read the data from the NT3H2211W0FT1 via I2C, but sometimes I can read it and sometimes I can't.
I tried leaving a wait of more than one second after powering it on, but that didn't change the situation.
The program for the I2C part is below.

HAL_GPIO_WritePin(GPIOA,SW_Pin,GPIO_PIN_SET);
HAL_Delay(10);
tdata[0]=0x01;
HAL_I2C_Master_Transmit(&hi2c1,0xaa,tdata,1,100);
HAL_Delay(10);
HAL_I2C_Master_Receive(&hi2c1,0xab,rdata,8,100);
HAL_Delay(10);
HAL_GPIO_WritePin(GPIOA,SW_Pin,GPIO_PIN_RESET);

I would appreciate any advice you could give me regarding I2C communication.

Re: Regarding reading data from NT3H2111

KaiLi — Mon, 21 Apr 2025 13:19:44 GMT

Hello @shank

Could you provide the I2C sequence diagram? As shown in the following picture, let us see if the I2C communication works fine.

Or you can refer SW3647 to debug your code. SW3647 canbe downloaded from the below:

OM5569-NT322E | NTAG I2C plus Explorer Kit | NFC | NXP Semiconductors

Re: Regarding reading data from NT3H2111

shank — Tue, 22 Apr 2025 09:26:00 GMT

Thank you for your advice, kaiLi.
Unfortunately, the board that is not working for me is covered in resin, so I cannot see the waveform on an oscilloscope.
I am debugging with software, and when something is not working properly, HAL_ERROR is returned, so I decided to do a software reset (HAL_NVIC_SystemReset();) when HAL_ERROR is returned. Is this a bad way to deal with the problem when running a program?

Re: Regarding reading data from NT3H2111

KaiLi — Thu, 24 Apr 2025 01:59:54 GMT

Hello @shank

You can also try software reset, but it may not solve the problem. You still need to know the cause of HAL_ERROR.