SPI test with other boards

Jeevan Rudramurthy · ‎2017-12-17

Posted on December 18, 2017 at 06:49

Hi

We have tested the SPI example code provided from ST disco board with other boards like atmel controller.

Atmel as master and ST disco board as slave.

We have connected

Atmel ST/FPGA

MOSI MOSI

MISO MISO

SCK SCK

NSS NSS

We have set both board side clock frequency 86khz,

Clock Polarity 0

Clock phase 0

SPI Slave(ST) written data to master(Atmel) is below

we have observed the data as below table, other data we have attached.

Data Binary LSB/MSB No of bit shift

0x20(Real) 0010 0000 - -

0x10 0001 0000 LSB 1 bit shift on right

0x80 1000 0000 MSB 2 bit shift on left

When we made slave(ST)side LSB or MSB orientation data shift is happening as above,

Can you please suggest me what is the issue.

the other data observed is attached.

S.Ma · ‎2017-12-17

Posted on December 18, 2017 at 07:50

Which STM32 is used? At which point of the communication the data to send out by slave is ready? Using interrupt and especially EXTI interrupt on the NSS pin?

Jeevan Rudramurthy · ‎2017-12-19

Posted on December 19, 2017 at 11:07

We are using STM32F769I_Discovery board as slave

SPI_SLAVE_SYNBYTE = 0x55

/**

* @brief Slave synchronization with Master

* @param None

* @retval None

*/

static void Slave_Synchro(void)

{

uint8_t txackbyte = SPI_SLAVE_SYNBYTE, rxackbyte = 0x00;

/* if (HAL_SPI_TransmitReceive_IT(&SpiHandle, (uint8_t *)&txackbyte, (uint8_t *)&rxackbyte, 1) != HAL_OK)

{

Error_Handler();

}*/

if (HAL_SPI_TransmitReceive(&SpiHandle, (uint8_t *)&txackbyte, (uint8_t *)&rxackbyte, 1, HAL_MAX_DELAY) != HAL_OK)

{

Error_Handler();

}

I have tried with both driver API's provided for interrupt method its not working only for HAL_SPI_TransmitReceive only its working

Jeevan Rudramurthy · ‎2017-12-19

Posted on December 19, 2017 at 11:59

Does HAL works properly for interrupts