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[sw] fixed bug in park loop code

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The CPU hast to "ack" that it is halted all the time while running the park loop code.
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stnolting 2022-12-23 11:48:32 +01:00
parent 866baf11c2
commit c66344b43e
1 changed files with 1 additions and 1 deletions
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2
sw/ocd-firmware/park_loop.S
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@ -63,11 +63,11 @@ entry_exception:
// BASE + 8: entry for ebreak in debug-mode, halt request or return from single-stepped instruction
entry_normal:
sb zero, (DBMEM_SREG_BASE+SREG_HALTED_ACK)(zero) // ACK that CPU has halted
csrw dscratch0, s0 // save s0 to dscratch0 so we have a general purpose register available
// polling loop - waiting for requests
park_loop:
sb zero, (DBMEM_SREG_BASE+SREG_HALTED_ACK)(zero) // ACK that CPU is halted
lbu s0, (DBMEM_SREG_BASE+SREG_EXECUTE_REQ)(zero) // request to execute program buffer?
bnez s0, execute
lbu s0, (DBMEM_SREG_BASE+SREG_RESUME_REQ)(zero) // request to resume?