fix spi init
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system/spi.s65
212
system/spi.s65
@ -10,30 +10,148 @@
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.ifndef INCLUDE_SPI
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INCLUDE_SPI = 1
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.scope spi_p
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.zeropage
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code_page: .res 2 ; SPI_CODE_START + pages_written * 256
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.bss
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SPI_PAGES_WRITTEN: .res 1
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SPI_BYTES_WRITTEN: .res 1
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bytes_written: .res 1
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pages_written: .res 1
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.include "util/math.s65"
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; spi-transferred code will be placed here
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.segment "SPI"
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SPI_CODE_START: ; .res $1000
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lda $1000
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sta $1000
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lda $1000
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sta $1000
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lda $1000
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sta $1000
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SPI_CODE_START:
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lda '$'
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jsr lcd_char
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lda #<TEST_FMT
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sta ARG0
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lda #>TEST_FMT
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sta ARG1
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lda #<TEST_OUT
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sta ARG2
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lda #>TEST_OUT
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sta ARG3
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lda #$a9
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sta ARG4
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lda #$3c
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sta ARG5
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lda #$10
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sta ARG6
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jsr strf
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Print TEST_OUT
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@spiloop:
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lda IO1 + IO::RA
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lda IO1 + IO::RA
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bra SPI_CODE_START
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; jsr lcd_clear
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; PrintSlow msg,20
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; jmp home
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; msg:
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; .asciiz "YO DAS WAR SPI"
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lda IO2 + IO::RA
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nop
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bra @spiloop
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jmp home
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; TODO allocate zp memory
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fmt_idx = $30
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out_idx = $31
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;********************************************************************************
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; @function Format a string
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; @details
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; If there is no value to be read, the Pz will be set
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; Formats:
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; - u: unsigned decimal integer (1 byte)
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; - U: unsigned decimal integer (2 bytes)
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; @param ARG0-1: Format string address
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; @param ARG2-3: Output string address
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; @param ARG4+: Additional parameters
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; @returns
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; @modifies: A, Y
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;********************************************************************************
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.proc strf
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stz out_idx
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stz fmt_idx
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ldy #0 ; position in string
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ldx #0 ; index of format args
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@loop:
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ldy fmt_idx
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lda (ARG0),y
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beq @null
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cmp #'%'
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beq @percent
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@normal_char: ; store A in output string
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ldy out_idx
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sta (ARG2),y
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inc fmt_idx
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inc out_idx
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beq @out_overflow
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bra @loop
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@percent: ; check for format in next position
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iny
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sty fmt_idx
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lda (ARG0),y
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beq @null
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; formats
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cmp #'x'
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beq @format_hex1
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bra @normal_char
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@format_hex1: ; 1 byte hex -> 2 chars
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lda ARG4,x
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phx
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jsr int8_to_hex_str
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ldy out_idx
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sta (ARG2),y ; most sig digit
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iny
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beq @out_overflow
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txa
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sta (ARG2),y ; least sig digit
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iny
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beq @out_overflow
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sty out_idx
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plx
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inx ; 1 byte of args handeled
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; bra @format_return
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@format_return: ; increment fmt_idx to swallow the formating char
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inc fmt_idx
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bra @loop
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@out_overflow: ; store 0 in last position
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ldy #$ff
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sty out_idx
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@store_null:
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lda #0
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@null: ; store and return
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ldy out_idx
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sta (ARG2),y
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@rts:
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rts
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.endproc
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;********************************************************************************
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; @function Convert a 1 byte number into two hex characters
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; @param A: Number to convert
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; @returns A: Most significant digit
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; @returns X: Least significant digit
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; @modifies X,Y,A
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;********************************************************************************
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.proc int8_to_hex_str
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pha
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and #%00001111
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tay
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ldx HEX_CHARS,y
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pla
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div A,16
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and #%00001111
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tay
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lda HEX_CHARS,y
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rts
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.endproc
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HEX_CHARS: .byte "0123456789ABCDEF"
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TEST_FMT: .asciiz "%x -> %x -> %x:)"
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TEST_OUT: .asciiz "TESTOUT"
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; SPI_P = as peripheral
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.code
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.struct SPI_P_Pins
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; VIA addresses
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@ -50,12 +168,20 @@ SPI_CODE_START: ; .res $1000
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.endstruct
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;********************************************************************************
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; @function Initialize the IO Adapter for SPI
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; @param ARG0-1 Address of the SPI_Pins struct
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; @function Begin listening for SPI transfers
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; @details
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; - initialize variables
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; - configure shift register to shift in under external clock
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; - enable shift register interrupts
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;********************************************************************************
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.proc spi_p_init
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stz SPI_PAGES_WRITTEN
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stz SPI_BYTES_WRITTEN
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.proc begin
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stz pages_written
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stz bytes_written
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; store address in zp
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lda #<SPI_CODE_START
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sta code_page
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lda #>SPI_CODE_START
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sta code_page + 1
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; todo USE MASKS
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; set Shift register to shift in under external clock on CB1
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lda #IO::ACR::SR_SIN_PHIE
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@ -64,21 +190,49 @@ SPI_CODE_START: ; .res $1000
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; enable SR interrupts
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lda #(IO::IRQ::IRQ | IO::IRQ::SR)
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sta SPI_IO + IO::IER
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DEBUG_LED_ON 1
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; load SR to reset
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lda SPI_IO + IO::SR
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rts
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.endproc
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.proc spi_p_read
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DEBUG_LED_ON 0
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; print received byte
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;********************************************************************************
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; @function Stop listening for SPI transfers
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; @details
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; Disables shift register interrupts
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;********************************************************************************
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.proc end
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; disable SR interrupts
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lda #IO::IRQ::SR
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sta SPI_IO + IO::IER
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rts
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.endproc
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;********************************************************************************
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; @function Read a byte from SPI
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; @details
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; Reads a byte from the shift register and stores it in the SPI code buffer
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;********************************************************************************
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.proc read
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ldx bytes_written
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lda SPI_IO + IO::SR
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sta SPI_CODE_START,x
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inc SPI_BYTES_WRITTEN
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jsr lcd_char
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inc bytes_written
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beq @new_page
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rts
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@new_page:
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inc pages_written
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inc code_page + 1
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rts
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.endproc
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;********************************************************************************
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; @function Initialize the IO Adapter for SPI
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; @param ARG0-1 Address of the SPI_Pins struct
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;********************************************************************************
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;********************************************************************************
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; @function Read bytes
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; @param X Number of bytes to send
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@ -96,8 +250,8 @@ SPI_CODE_START: ; .res $1000
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.proc send_data
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.endproc
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.endscope
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_send_byte:
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.endif
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