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Problem with McSPI interface on AM3517 using angstrom framework (drivers).

Purna Chandra Rao Nannapaneni
Prodigy 10 points
Other Parts Discussed in Thread: AM3517

Hi,

I am trying to use McSPI3 interface on AM3517 device on linux platform (angstrom framework). Using only one channel. 16-bit width for command & data. Using a GPIO for CS_n. I am doing simple read access from OS using IOCTL command. When I probe signals I see huge delay (close to 90us, spi_clk = 12Mhz) between command & data.

Basically SPI_CLK run for 16 cycles & huge delay & 16 cycles. I don't understand the reason behind this delay. Any inputs ?. Due to this we are not able to acheive require bandwidth on this interface.

Appreciate any inputs.

Thanks & Regards,

Purna