79 lines
1.4 KiB
C
79 lines
1.4 KiB
C
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/*
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* vga.h
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*
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* Created on: Jul 8, 2017
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* Author: spinalvm
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*/
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#ifndef VGA_H_
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#define VGA_H_
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#include <stdint.h>
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typedef struct {
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uint32_t hSyncStart ,hSyncEnd;
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uint32_t hColorStart,hColorEnd;
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uint32_t vSyncStart ,vSyncEnd;
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uint32_t vColorStart,vColorEnd;
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}Vga_Timing;
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static const Vga_Timing vga_h640_v480_r60 = {
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.hSyncStart = 96,
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.hSyncEnd = 800,
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.hColorStart = 96 + 16,
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.hColorEnd = 800 - 48,
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.vSyncStart = 2,
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.vSyncEnd = 525,
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.vColorStart = 2 + 10,
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.vColorEnd = 525 - 33
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};
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static const Vga_Timing vga_simRes = {
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.hSyncStart = 8,
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.hSyncEnd = 70,
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.hColorStart = 16,
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.hColorEnd = 64,
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.vSyncStart = 2,
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.vSyncEnd = 48,
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.vColorStart = 8,
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.vColorEnd = 40
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};
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static const Vga_Timing vga_simRes_h160_v120 = {
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.hSyncStart = 8,
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.hSyncEnd = 24+160,
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.hColorStart = 16,
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.hColorEnd = 16+160,
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.vSyncStart = 2,
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.vSyncEnd = 10+120,
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.vColorStart = 6,
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.vColorEnd = 6+120
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};
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typedef struct
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{
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volatile uint32_t STATUS;
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volatile uint32_t FRAME_SIZE;
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volatile uint32_t FRAME_BASE;
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volatile uint32_t DUMMY0[13];
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volatile Vga_Timing TIMING;
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} Vga_Reg;
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static uint32_t vga_isBusy(Vga_Reg *reg){
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return (reg->STATUS & 2) != 0;
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}
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static void vga_run(Vga_Reg *reg){
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reg->STATUS = 1;
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}
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static void vga_stop(Vga_Reg *reg){
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reg->STATUS = 0;
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while(vga_isBusy(reg));
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}
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#endif /* VGA_H_ */
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