st25r3916comRepeatStart() does not work for the st25r3916 driver

[Mihaita Ivascu]

Hello,

 

     I am working with stm32cubeIDE using some NDEF example for nucleo NFC08A1 extension board with st25r3916b rfid reader.

    Debugging the demoCycle example I see that the code that should insert a repeat start on I2C communication does nothing(which confirms what I have described in another post about the stm32ube example for it, not being able to read chip id):

#ifdef RFAL_USE_I2C
static void st25r3916comRepeatStart( void )
{
 st25r3916I2CRepeatStart();
 st25r3916I2CSlaveAddrRD( ST25R3916_I2C_ADDR );
}
#endif /* RFAL_USE_I2C */

it points some macros but that have nothing associated in rfal_platform.h

#define platformI2CRepeatStart() /*!< I2C Repeat Start */
#define platformI2CSlaveAddrWR(add) /*!< I2C Slave address for Write operation */
#define platformI2CSlaveAddrRD(add) 

 

is it expected that the user implements those?

 

Thanks,

     Mihai

 

[Brian TIDAL]

Hi Mihai,

These macros are designed to support different platforms and different I2C drivers. In the case of STM32 platforms, the BSP_NFC0XCOMM_SequencialRecv and BSP_NFC0XCOMM_SequencialSend functions directly handle Start, Stop, and Restart. Thus platformI2CRepeatStart is an empty macro on this platform.

Here are some examples of I2C transactions on STM32L476 platform:

Single register read:

Multiple register read:

Single register write:

Fifo load:

Direct command:

Rgds

BT

[Mihaita Ivascu]

Hello BT,

 

      Thanks for the quick reply.

      Yes I am familiar with the i2c transactions, I was able to communicate with st25r3916 rfid using Arduino and Wire lib. But not with Stm32cubeIDE and the st25r3916 driver.

      This is a bit unfortunate as it seems it would be easier using the ndef example from stm32cubeIDE.

      So I need to replace those macros with BSP_NFC0XCOMM_SequencialRecv ?

      I did not see that function being called while debugging. Actually I don't see where it is implemented.

 

Thanks,

      Mihai

 

     

 

 

[Brian TIDAL]

Hi,

which STM32 or which NUCLEO-64 board do you use? Is the code being generated with STM32CubeMX with X-CUBE-NFC6 package? Have you enabled the I2C interrupt? Is the X-NUCLEO-NFC08A1 being modified to support I2C instead of SPI?

Make sure to have EXTI (ST25_IRQ) priority value > IC2 interrupt priority value > SYSTICK interrupt priority value, e.g. EXTI prio 2, I2C prio 1 and SYSTICK prio 0

"So I need to replace those macros with BSP_NFC0XCOMM_SequencialRecv ?": no.

Feel free to send me your ioc and your project.

Rgds

BT