NUCLEO-H7S3L8 reading using I3C protocol with BOS1921 device

[johantheking]

Hi everyone,

 

I'm using the NUCLEO-H7S3L8 to try to comunicate with a BOS1921 device using the I3C protocol. To get practice i'm trying to read form the Register Map in 6.10 (see the datasheet). Using some example codes from this link  https://www.st.com/resource/en/application_note/an5879-introduction-to-i3c-for-stm32h5-series-mcu-stmicroelectronics.pdf 

and this https://wiki.st.com/stm32mcu/wiki/Getting_started_with_I3C   . 

from the example code that i made i try to give the bos1921 a adres, after that i try to read from the Register 0x02 and expect a value of 0x046A in return. but everytime it looks like it's the value from register 0x1E, that is the CHIP_ID. Even trying to read other registers i get the same result.

Any idea what I'm doing wrong trying to read?

 

Buffers i made:

I3C_XferTypeDef aContextBuffers[2];


/* Buffer used for transmission */
uint8_t aTxBuffer[2];


uint8_t aRxBuffer[2];


uint8_t readAdress[1] = {0x06};

/* Buffer used by HAL to compute control data for the Private Communication */
uint32_t aControlBuffer[0xF];



I3C_PrivateTypeDef aPrivateDescriptor[3] = \
 {
 {DEVICE_STA_ADDR, {readAdress, 1}, {NULL, 0}, HAL_I3C_DIRECTION_WRITE},
											{DEVICE_STA_ADDR, {NULL, 0}, {aRxBuffer, 2}, HAL_I3C_DIRECTION_READ}
 };

 

The test code that i used for it:

uint64_t TargetPayload;
 HAL_StatusTypeDef status = HAL_OK;

 /* Assign dynamic address processus */
 do
 {
 status = HAL_I3C_Ctrl_DynAddrAssign(&hi3c1, &TargetPayload, I3C_RSTDAA_THEN_ENTDAA, 5000);
 if (status == HAL_BUSY)
 {
 HAL_I3C_Ctrl_SetDynAddr(&hi3c1, DEVICE_STA_ADDR);
 printf("assigned adres to device \n\r");
 }
 } while (status == HAL_BUSY);



 while (HAL_I3C_GetState(&hi3c1) != HAL_I3C_STATE_READY);




 if (HAL_I3C_Ctrl_IsDeviceI3C_Ready(&hi3c1, DEVICE_STA_ADDR, 300, 1000) != HAL_OK)
 {
 /* Error_Handler() function is called when error occurs. */
 printf("Device is not ready \n\r");
 	while(1);
 }

 printf("Device is ready \n\r");



 aContextBuffers[0].CtrlBuf.pBuffer = aControlBuffer;
 aContextBuffers[0].CtrlBuf.Size = 1;
 aContextBuffers[0].TxBuf.pBuffer = aTxBuffer;
 aContextBuffers[0].TxBuf.Size = 1;

 aContextBuffers[1].CtrlBuf.pBuffer = aControlBuffer;
 aContextBuffers[1].CtrlBuf.Size = 1;
 aContextBuffers[1].RxBuf.pBuffer = aRxBuffer;
 aContextBuffers[1].RxBuf.Size = 2;





 if (HAL_I3C_AddDescToFrame(&hi3c1,
 NULL,
 &aPrivateDescriptor[0],
 &aContextBuffers[0],
 aContextBuffers[0].CtrlBuf.Size,
								 I3C_PRIVATE_WITH_ARB_RESTART) != HAL_OK)
 {

 	printf("error trying to add descriptor \n\r");
 while(1);
 }





 if(HAL_I3C_Ctrl_Transmit(&hi3c1, &aContextBuffers[0], 1000) != HAL_OK)
	 {
	 	 printf("Error sending data \n\r");
	 	 while(1);
	 }


 while (HAL_I3C_GetState(&hi3c1) != HAL_I3C_STATE_READY);




 if (HAL_I3C_AddDescToFrame(&hi3c1,
 NULL,
 &aPrivateDescriptor[1],
 &aContextBuffers[1],
 aContextBuffers[1].CtrlBuf.Size,
 I3C_PRIVATE_WITHOUT_ARB_STOP) != HAL_OK)
 {

 	printf("error trying to add descriptor \n\r");
 while(1);
 }


 if(HAL_I3C_Ctrl_Receive(&hi3c1, &aContextBuffers[1], 1000) != HAL_OK)
	 {
	 	 printf("Error Reciving data \n\r");
	 	 while(1);
	 }

 printf("data 1 = %x \n\r", aRxBuffer[0]);
 printf("data 2 = %x \n\r", aRxBuffer[1]);

 

Screenshot of the prints that it made:

 

 

Screenshots from my logic analyzer:

Assigning adress:

 

trying to read: