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long delay between chars when using SPI(FRDM-K64F)

Question asked by ling Q on Jun 24, 2015
Latest reply on Jun 28, 2015 by ling Q

Hi there,

 

Has anyone met a problem when setting SPI delays (delay between chars) in Processor Expert?

 

My project is sending some data to a DAC via SPI and I used PE to do the settings. When the clock rate is around 1MHz, everything works fine and I can set the delay between chars to around 1.44us. However, when I increase the clock rate to a higher frequency, say 10MHz, and remain the delay between chars to 1.44us, the delay I get from logic analyzer becomes 5us.

 

I didn't change any code or settings except the clock rate, so I am really confused about this situation.

Anyone has any idea about this problem?

 

Thanks,

Ling

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