STM32F103C6 SPI to dataflash(M25p80) sending & receiving problem

[vinay]

Posted on February 11, 2015 at 14:51

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[stm322399]

Posted on February 11, 2015 at 15:10

Did you enable SPI1 peripheral clock ?

Can you observe SCK on PA5 with an o-scope ?

[vinay]

Posted on February 12, 2015 at 12:10

Yes ,

 clock was enabled and PA5 clock signal also getting on o-scope,But instead of 72 MHZ am getting only 64MHZ of clock frequency. I think that is not issue for SPI, Because SPI can able to run with maximum 50MHZ not more than that.

Problem is data not getting into SPI_DR register .Remaining all SPI registers are working properly.

If you have any clarity about the issue please help me out Sir.

[stm322399]

Posted on February 12, 2015 at 14:00

First advice: avoid running at 72 or 64 MHz during troubleshooting session, stay at 10MHz max

Second advice: show use code with all macro define necessary to understand. Example: what is SPI1 ? Is this SPI1 as defined in ST  CMSIS device header file (a pointer to a structure defining SPI registers) ? Or is SPI1 an integer that you use to index the p_stfSPIReg_all device table ? This is not clear, and maybe the source of your bug.

Show us all function that you use that are not from SPL or HAL:

SPI_Init (same name as SPL but not same argument type), and others.

Last, tell us where you are blocked:

/* Wait to receive a byte */

  while (SPI_GetFlagBitStatus(SPI1, SPI_RXEN_INTERRUPT) == SPI_FLAGBIT_RESET);

or

// wait until transmit complete

while(!(p_stfSPIReg_all[en_lDev]->SPI_SR & SPI_SR_RXNE_MASK ));