SPI issue

[Naresh_]

Hi ,

i am using STM32H753z, implementing the SPI.

when i using HAL_SPI_TransmitReceive() data is transfer and receive happening but data is mismatching.

when i using HAL_SPI_Transmit(),   HAL_SPI_Transmit_IT()   is showing busy when i debug same wave to HAL_SPI_Receive(),  HAL_SPI_Receive_IT(). 

 

Thank you,

Naresh

if (hspi->State != HAL_SPI_STATE_READY)

{

return HAL_BUSY;

}

[Andrew Neil]

Please see the Posting Tips for how to properly post source code, and other details required - including your hardware setup:

https://community.st.com/t5/community-guidelines/how-to-write-your-question-to-maximize-your-chances-to-find-a/ta-p/575228

 

---

@Naresh_ wrote:

transfer and receive happening but data is mismatching.

---

What, exactly, do you mean by that?

Have you used an oscilloscope or logic analyser to see what's happening on the wires?

[Naresh_]

Hi Andrew, 

thank you for quick response.  

 i am not use any oscilloscope or logic analyzer.

i doing SPI loopback now i facing issue in receive buffer,

uint8_t Tx_buffer[]="hello_SPI_";   in Tx side 

by using HAL_SPI_TransmitReceive(&hspi1, (uint8_t*)Tx_buffer, (uint8_t*)rx_buffer, size,100);  in re_buffer date is incorrect i getting data is08 05 0C 0C 0F 0F 03 00 09 0F (in hex ) or <\b><5><\f><\f><15><15><3><\0><9><15>(in ASCII).

when i use HAL_SPI_Transmit() & HAL_SPI_Receive() then data in not receive in rx_buffer (both polling and interrupt).

 

Thanks,

Naresh

[Andrew Neil]

---

@Naresh_ wrote:

 i am not use any oscilloscope or logic analyzer.

---

You should do - how else will you be able to see what's happening on the wires?

[gbm]

Start by reading this topic:

https://community.st.com/t5/stm32-mcus-products/regarding-function-calls-when-performing-spi-communication-in/m-p/738412#M265178

 

To get SPI working, use TransmiReceive only. For SPI Master you usually don't need anything else. What's the SPI configuration? What's the SPI clock frequency? I suspect the SCLK if too fast - start by setting it to no more than 1 MHz, verify the correct operation, then try to increase it.

To use _IT functions, SPI interrupt must be enabled in SPI settings, NVIC tab. Still, after you get basic TransmitReceive working, try to use TransmitReceive_IT. Separate Transmit and Receive will not work.