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RTOS/AM3359: SPI receive problem

Part Number: AM3359


Tool/software: TI-RTOS

hi

i want to embedded the program mcspiloopbackAPP to my board "ice-v2 am335x"

i configure the pinmux and do some spi initiaization

i used the oscilloscope to check the clk spi_d0 spi_d1 phase

and it ack well so the pin mux is all alright

but i debug with this project and find that the tx is all zero

the MCSPI_TX0 is 0X0D

because is set the txbuff is

and the MCSPI_IRQSTATUS RX_FULL is setted to 1 ,it improve that the rx has recieveed the data from the tx

but the MCSPI_RX0 is still zero

what is the problem?

it send and recieve zero?

Edison