MatthiasQuintern/6502-OS
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matthias@rpi 2023-10-30 22:14:33 +01:00
parent bb88981d80
commit 83009b11b4
1 changed files with 40 additions and 7 deletions
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47
system/spi.s65
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@ -5,19 +5,19 @@
; @depends IO-W65C22N ; @depends IO-W65C22N
;******************************************************************************** ;********************************************************************************
.include "system/system.h65" .include "system/system.h65"
.ifndef INCLUDE_SPI .ifndef INCLUDE_SPI
INCLUDE_SPI = 1 INCLUDE_SPI = 1
.segment "CODE" .segment "CODE"
.struct SPI_Pins
.struct SPI_P_Pins
; VIA addresses ; VIA addresses
DDR_a .word ; address of the data direction register DDR_a .word ; address of the data direction register
R_a .word ; address of the register R_a .word ; address of the register
; pin mask ; pin mask
SLK_p .byte ; Serial Clock SCLK_p .byte ; Serial Clock
POCI_p .byte ; Peripheral Out / Controller In POCI_p .byte ; Peripheral Out / Controller In
PICO_p .byte ; Peripheral In / Controller Out PICO_p .byte ; Peripheral In / Controller Out
CSB_p .byte ; Chip Select CSB_p .byte ; Chip Select
@ -25,14 +25,47 @@ INCLUDE_SPI = 1
CPOL .byte ; Clock Polarity CPOL .byte ; Clock Polarity
CPHA .byte ; Clock Phase CPHA .byte ; Clock Phase
.endstruct .endstruct
;********************************************************************************
; @function Initialize the IO Adapter for SPI
; @param ARG0-1 Address of the SPI_Pins struct
;********************************************************************************
.proc spi_p_init
; todo USE MASKS
; set Shift register to shift in under external clock on CB1
lda #%00001100
sta SPI_IO + IO_ACR
; enable SR interrupts
lda #%10000100
sta SPI_IO + IO_IER
rts
.endproc
.proc spi_p_read
; print received byte
lda SPI_IO + IO_SR
jsr _lcd_char
rts
.endproc
;********************************************************************************
; @function Read bytes
; @param X Number of bytes to send
; @param ARG0-1 Address of the SPI_Pins struct
; @param ARG2-3 Address of the first byte
;********************************************************************************
.proc recv_data
.endproc
;******************************************************************************** ;********************************************************************************
; @function Send bytes ; @function Send bytes
; @param X Number of bytes to send ; @param X Number of bytes to send
; @param ARG0-1 Address of the first byte ; @param ARG0-1 Address of the SPI_Pins struct
; @param ARG2-3 Address of the SPI_Pins struct ; @param ARG2-3 Address of the first byte
;******************************************************************************** ;********************************************************************************
send_data: .proc send_data
.endproc