rp2: Correct bit access for rp2_state_machine_init.#18625
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If you call `rp2.StateMachine.init()` with `pull_thresh=32` it will overwrite the FJOIN_TX bit in the SMx_SHIFTCTRL register. This commit fixes that issue. Signed-off-by: Ned Konz <ned@metamagix.tech>
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If you call
rp2.StateMachine.init()withpull_thresh=32it will overwrite theFJOIN_TXbit in theSMx_SHIFTCTRLregister. This PR fixes that issue.Summary
I had a PIO program in which the RXFIFO was not working. I traced it down to
asm_pio_override_shiftctrl()shifting the high bit of mypull_threshargument of 32 into the adjoining bit 30 (FJOIN_TX) of theSMx_SHIFTCTRLregister. A threshold of 32 should be encoded as a 0 in bits 29:25 of this register.This PR uses the bit mask provided as an argument to
asm_pio_override_shiftctrl()to ensure that bits outside the field don't get stepped on.Testing
I tested this with an RP2350 board and a Segger JLINK to ensure that the values in the register were correct.