MatthiasQuintern/6502-OS
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

add read

Browse Source
This commit is contained in:
matthias@rpi 2023-10-30 22:14:33 +01:00
parent bb88981d80
commit 83009b11b4
1 changed files with 40 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

45
system/spi.s65
View File

@ -9,15 +9,15 @@
.ifndef INCLUDE_SPI
INCLUDE_SPI = 1
.segment "CODE"
.struct SPI_Pins
.struct SPI_P_Pins
; VIA addresses
DDR_a .word ; address of the data direction register
R_a .word ; address of the register
; pin mask
SLK_p .byte ; Serial Clock
SCLK_p .byte ; Serial Clock
POCI_p .byte ; Peripheral Out / Controller In
PICO_p .byte ; Peripheral In / Controller Out
CSB_p .byte ; Chip Select
@ -26,13 +26,46 @@ INCLUDE_SPI = 1
CPHA .byte ; Clock Phase
.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
; @param X Number of bytes to send
; @param ARG0-1 Address of the first byte
; @param ARG2-3 Address of the SPI_Pins struct
; @param ARG0-1 Address of the SPI_Pins struct
; @param ARG2-3 Address of the first byte
;********************************************************************************
send_data:
.proc send_data
.endproc