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Fix bug where A was overwritten in _uart_txb_block

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If you wanted to transmit a value and then check what it was, you can do
that now.
This commit is contained in:
Byron Lathi
2022-03-14 22:19:19 -05:00
parent a627d38778
commit 340f43103a
1 changed files with 2 additions and 0 deletions
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sw/uart.s
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@@ -17,10 +17,12 @@ _uart_txb:
rts rts
_uart_txb_block: _uart_txb_block:
pha
sta UART_TXB ; Write value sta UART_TXB ; Write value
@1: lda UART_STATUS ; Wait for status[0] to be 0 @1: lda UART_STATUS ; Wait for status[0] to be 0
bit #$01 bit #$01
bne @1 bne @1
pla
rts rts
_uart_rxb: _uart_rxb: