From 706dbe56e1955922b0b39836997ef541169ca75d Mon Sep 17 00:00:00 2001 From: Daniele Verducci su MatissePenguin Date: Sun, 14 Feb 2021 19:08:45 +0100 Subject: [PATCH] Extended image to 368x256 --- .../software/avr-assembly/video_generator.asm | 14 +++++++------- 1 file changed, 7 insertions(+), 7 deletions(-) diff --git a/pat80-io-devices/composite-pal-adapter/software/avr-assembly/video_generator.asm b/pat80-io-devices/composite-pal-adapter/software/avr-assembly/video_generator.asm index d6e2dbf..ec87cbf 100644 --- a/pat80-io-devices/composite-pal-adapter/software/avr-assembly/video_generator.asm +++ b/pat80-io-devices/composite-pal-adapter/software/avr-assembly/video_generator.asm @@ -8,7 +8,7 @@ ; This also displays byte's MSB pixel "for free", as the video pin is PD7 (last bit of PORTA). ; This module generates a Composite PAL monochrome signal with a resolution -; of 416x304 pixels of which only 376x232 pizels are visible (= 46x29 characters). +; of 416x304 pixels of which only 368x256 pizels are visible (= 46x29 characters). ; The signal is generated using 16-bit Timer1 and interrupts. @@ -43,8 +43,8 @@ on_tim1_ovf: sbi PORTD, BUSY_PIN ; called by timer 1 two times per line (every 32 uS) during hsync, unless drawing picture. inc STATUS - ; if STATUS >= 176 then STATUS=0 - cpi STATUS, 178 ; TODO: Added a seventh sync pulse at end of screen because at the first short sync after the image, the timer doesn't tick at the right time + ; if STATUS >= 152 then STATUS=0 + cpi STATUS, 152 ; TODO: Added a seventh sync pulse at end of screen because at the first short sync after the image, the timer doesn't tick at the right time brlo switch_status clr STATUS ; check status and decide what to do @@ -56,9 +56,9 @@ on_tim1_ovf: cpi STATUS, 92 brlo empty_line ; 20-91: empty lines breq start_draw_picture ; 92: draw picture - cpi STATUS, 164 - brlo empty_line ; 93-165 = draw empty lines - jmp short_sync ; 166-177 = short sync + cpi STATUS, 140 + brlo empty_line ; 93-139 = draw empty lines + jmp short_sync ; 140-151 = short sync ; reti is at end of all previous jumps start_draw_picture: @@ -159,7 +159,7 @@ draw_picture: ldi r26, 0xFF ; start 304 picture lines - ldi LINE_COUNTER, 232 ; line counter + ldi LINE_COUNTER, 256 ; line counter h_picture_loop: ; ***************** DRAW FIRST LINE *********************