TMS320F28035: IEC60730 test for ST1 and RPC

Okay, for ST1, I expect that all the backward compatibility modes are set to C28x mode and can be assumed constant values. For the R/W fields, you can use something like the following.

ST1_CLR_TEST_MASK       .set    0xFF5B
ST1_SET_TEST_MASK       .set    0x0A00

st1RegTest:
        MOVL    XAR6, @ACC              ; save ACC contents
        AND     IER, #0                 ; clear IER so we can test INTM

        AND     AL, #ST1_CLR_TEST_MASK  ; clear the bits that need to stay 0
        OR      AL, #ST1_SET_TEST_MASK  ; set the bits that need to stay 1

        PUSH    @AL
        POP     ST1                     ; write to ST1
        PUSH    ST1
        POP     AR4
        CMP     AL, @AR4
        B       fail_CPU_test, NEQ

        NOT     ACC
        AND     AL, #ST1_CLR_TEST_MASK  ; clear the bits that need to stay 0
        OR      AL, #ST1_SET_TEST_MASK  ; set the bits that need to stay 1

        PUSH    @AL
        POP     ST1                     ; write to ST1
        PUSH    ST1
        POP     AR4
        CMP     AL, @AR4
        B       fail_CPU_test, NEQ

        MOVL    ACC, @XAR6              ; restore ACC contents

I placed the code after the loop_REG_2_test loop but before the 16-bit registers are restored. You'll also need to add ST1 to the saves and restores that happen in that section--save it to one of the ARn registers that isn't already being used for something else.

Note that the code above doesn't take care of the read-only bits IDLESTAT and LOOP. If a low power mode is being used, IDLESTAT can be indirectly tested by doing a functional test of the low power mode. LOOP can be tested by executing the LOOPZ or LOOPNZ and using an interrupt or timer to break the loop. If you use an interrupt, you may even be able to read ST1 off the stack and confirm that LOOP was set to 1.

Whitney

Hi Terry,

Hope this resolved your query. Feel free to send us a question if not resolved.

Regards,

--Ashish