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AM5728: Can't receive 0xFF in UART driver

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Genius 13655 points

Part Number: AM5728

Hello Champs,

Customer used the uart driver in ti-processor-sdk-rtos-am57xx-evm-04.03.00.05. The parameters are configured as below:




UART_init->open 2 uart:  uart_handle1 = UART_open(0, &user_params);uart_handle3 = UART_open(2, &user_params);->use UART_read(uart_handle1, buf_r,20); and UART_write(uart_handle1,buf_r,20); to realize PC->dsp->PC data flow. 

The test result is that except 0xFF data, other data could be sent correctly.  When PC sends 0xFF to DSP, there is no data return. 

Customer can catch the 0xFF from uart TX data line, it means the PC has sent 0xFF to DSP correctly. Then he tracked the UART receive register, it can catch the 0xFF correctly. 


Then he tracked the UART_gets(&x, 1); further, 

He found that uart can receive the 0xff, but it can't return when reading. 

Is it a bug for the uart driver?

Thanks.
Rgds

Shine