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31
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.nolist
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.include "m168def.inc" ; Same family as 328P
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.list
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4 |
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5 |
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;; Interrupt Vector
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.org 0x00
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rjmp init
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33
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10 |
.org OC1Aaddr
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11 |
; Timer/Counter1 Compare Output A
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rjmp Timer_OC1A
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.org OC0Aaddr
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15 |
; Timer/Counter0 Compare Output A
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rjmp Timer_OC0A
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.org SPIaddr
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rjmp SPI_Interrupt
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20 |
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21 |
.org 0x40
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22 |
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31
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23 |
;; Syntax
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.include "macros.inc"
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25 |
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;; SPI
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.include "spi.inc"
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33
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;; Matrix
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.include "matrix.inc"
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;; Timer
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.set TIMER0_CB_A = Matrix_ScanCol
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.include "timer.inc"
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31
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;; Utils
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.include "delay.inc"
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;; Scan through each pixel
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33
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Main_ScanRaw:
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31
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; init
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ldi r18, 1
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ldi r19, 1
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scan_loop:
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; write out to SPI
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sts spi_outbuf + 0, r18 ; rows
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sts spi_outbuf + 1, r19 ; columns
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50 |
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rcall SPI_SendRecv
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52 |
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; delay
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ldi r20, 5 ; ~4M cycles
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rcall VarDelay
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33
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; cols
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lsl r19 ; next col
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brcc scan_loop ; refresh if we didn't overflow
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rol r19 ; shift back from C into r21.0
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31
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; rows
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lsl r18 ; next row
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brcc scan_loop ; refresh if we didn't overflow
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rol r18 ; shift back from C into r20.0
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; one scan completed
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ret
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33
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;; Scan with test pattern
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Main_ScanTest:
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; Generate pattern
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; end of buffer
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ldi r17, MATRIX_COLS
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ldi XL, low(matrix_rowbuf + MATRIX_COLS)
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ldi XH, high(matrix_rowbuf + MATRIX_COLS)
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; bit pattern
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ldi r16, 0b11
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st_loop:
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; put
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st -X, r16
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; flip
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rol r16
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; loop until zero
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dec r17
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brne st_loop
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st_scan:
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; Scan repeatedly
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;rcall Matrix_ScanCol
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rjmp st_scan
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31
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Main:
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init:
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; Stack
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ldi r16, high(RAMEND)
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ldi r17, low(RAMEND)
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out SPH, r16
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out SPL, r17
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; Enable interrupts
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sei
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33
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; DEBUG
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sbi DDRD, PORTD7
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cbi PORTD, PORTD7
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; Timer
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rcall Timer_Init
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; SPI
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rcall SPI_Init
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119 |
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; Matrix
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rcall Matrix_Init
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; Run
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; rcall Main_ScanRaw
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125 |
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rcall Main_ScanTest
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127 |
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end:
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rjmp end
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