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chore: using aliases from hardware.inc and optimized divisor setup

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This commit is contained in:
Gale Misery Faraday
2024-12-07 06:55:22 -06:00
parent 808f868344
commit 1237cc89eb
1 changed files with 9 additions and 8 deletions
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13
code/boot/src/boot.s
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@@ -13,18 +13,19 @@
ORG ROM_BASE ORG ROM_BASE
RESET RESET
lda #%11000001 ; 8n1 serial, enable DLAB ; 8n1 Serial Enable DLAB
lda #(UARTF_LCR_WLS | UARTF_LCR_DLAB)
sta UART_LCR sta UART_LCR
lda #$00 ; Set divisor to 12 (9600 baud) ; REVIEW: Potential endianness hiccough here
sta UART_DLL ldd #$0C00 ; Set divisor to 12 (9600 baud)
lda #$0C
sta UART_DLM sta UART_DLM
stb UART_DLL
lda #%11000000 ; 8n1 serial, disable DLAB lda #(UARTF_LCR_WLS) ; 8n1 serial, disable DLAB
sta UART_LCR sta UART_LCR
lda #%01000000 ; Enable RTS lda #(UARTF_MCR_RTS) ; Enable Request-to-Send
sta UART_MCR sta UART_MCR
lda 'H ; send 'H' lda 'H ; send 'H'