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Update comm.c

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Replaced non-default GBDK function with ASM code.
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GrenderG 2023-09-26 22:14:39 +02:00 committed by GitHub
parent 93b53546a0
commit 227da46d84
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1 changed files with 12 additions and 1 deletions
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comm.c
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@ -421,7 +421,18 @@ void main(void)
__endasm; __endasm;
} }
trade_byte_primary(); //trade_byte_primary();
// See https://github.com/gbdk-2020/gbdk-2020/pull/577
__asm
LD A,#0x02 ; .IO_RECEIVING
LD (__io_status),A ; Store status
LD A,#0x01
LDH (0x02),A ; (.SC) Use external clock
LD A,(__io_out)
LDH (0x01),A ; (.SB) Send __io_out byte
LD A,#0x81
LDH (0x02),A ; (.SC) Use external clock
__endasm;
while(_io_status == IO_RECEIVING || _io_status == IO_SENDING); while(_io_status == IO_RECEIVING || _io_status == IO_SENDING);