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#include "wirish.h"
#define LED_PIN 13
#define VGA_R 5 // B6
#define VGA_G 6 // A8
#define VGA_B 7 // A9
#define VGA_V 11 // A6
#define VGA_H 12 // A7
#define VGA_R_HIGH (GPIOB_BASE)->BSRR = BIT(6)
#define VGA_R_LOW (GPIOB_BASE)->BRR = BIT(6)
#define VGA_G_HIGH (GPIOA_BASE)->BSRR = BIT(8)
#define VGA_G_LOW (GPIOA_BASE)->BRR = BIT(8)
#define VGA_B_HIGH (GPIOA_BASE)->BSRR = BIT(9)
#define VGA_B_LOW (GPIOA_BASE)->BRR = BIT(9)
#define VGA_V_HIGH (GPIOA_BASE)->BSRR = BIT(6)
#define VGA_V_LOW (GPIOA_BASE)->BRR = BIT(6)
#define VGA_H_HIGH (GPIOA_BASE)->BSRR = BIT(7)
#define VGA_H_LOW (GPIOA_BASE)->BRR = BIT(7)
void isr_porch(void);
void isr_start(void);
void isr_stop(void);
void isr_update(void);
void setup()
{
pinMode(LED_PIN, OUTPUT);
digitalWrite(LED_PIN, 1);
pinMode(VGA_R, OUTPUT);
pinMode(VGA_G, OUTPUT);
pinMode(VGA_B, OUTPUT);
pinMode(VGA_V, OUTPUT);
pinMode(VGA_H, OUTPUT);
/* Send a message out USART2 */
Serial2.begin(9600);
Serial2.println("Video time...");
digitalWrite(VGA_R, 0);
digitalWrite(VGA_G, 0);
digitalWrite(VGA_B, 0);
digitalWrite(VGA_H,1);
digitalWrite(VGA_V,1);
timer_set_prescaler(4,0);
timer_set_mode(4, 1, TIMER_OUTPUTCOMPARE);
timer_set_mode(4, 2, TIMER_OUTPUTCOMPARE);
timer_set_mode(4, 3, TIMER_OUTPUTCOMPARE);
timer_set_mode(4, 4, TIMER_OUTPUTCOMPARE);
timer_set_reload(4, 2287);
timer_set_compare_value(4,1,200);
timer_set_compare_value(4,2,300);
timer_set_compare_value(4,3,2170); // 2219 max...
timer_set_compare_value(4,4,1);
timer_attach_interrupt(4,1,isr_porch);
timer_attach_interrupt(4,2,isr_start);
timer_attach_interrupt(4,3,isr_stop);
timer_attach_interrupt(4,4,isr_update);
timer_set_count(4,0);
}
void loop() {
// everything happens in the interrupts!
}
int toggle = 0;
uint16 x = 0;
uint16 y = 0;
uint8 v_active = 1;
void isr_porch(void) {
VGA_H_HIGH;
y++;
if(y>=523) {
y=1;
v_active = 1;
return;
}
if(y>=492) {
VGA_V_HIGH;
return;
}
if(y>=490) {
VGA_V_LOW;
return;
}
if(y>=479) { // 479
v_active = 0;
return;
}
}
uint8 logo[18][16] = {
{0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,},
{0,0,0,0,0,0,1,1,1,0,0,0,0,0,0,0,},
{0,0,0,0,0,1,0,0,0,1,0,0,0,0,0,0,},
{0,0,0,0,1,0,0,1,0,0,1,0,0,0,0,0,},
{0,0,0,1,0,0,0,1,0,0,0,1,0,0,0,0,},
{0,0,1,0,0,0,0,1,0,0,0,0,1,0,0,0,},
{0,0,1,0,0,1,0,1,0,1,0,0,1,0,0,0,},
{0,1,0,0,0,0,1,1,1,0,0,0,0,1,0,0,},
{0,1,0,1,0,0,0,1,0,0,0,1,0,1,0,0,},
{1,0,0,0,1,0,0,1,0,0,1,0,0,0,1,0,},
{1,0,0,0,0,1,0,1,0,1,0,0,0,0,1,0,},
{1,0,0,0,0,0,1,1,1,0,0,0,0,0,1,0,},
{0,1,0,0,0,0,0,1,0,0,0,0,0,1,0,0,},
{0,0,1,1,0,0,0,1,0,0,0,1,1,0,0,0,},
{0,0,0,0,1,1,1,0,1,1,1,0,0,0,0,0,},
{0,0,0,0,0,0,1,0,1,0,0,0,0,0,0,0,},
{0,0,0,0,0,0,1,1,1,0,0,0,0,0,0,0,},
{0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,}, };
void isr_start(void) {
if(!v_active) { return; }
VGA_R_LOW;
VGA_R_HIGH;
for(x=0; x<32; x++) {
if(logo[y/28][x/2]) {
VGA_G_HIGH;
VGA_B_HIGH;
} else {
VGA_G_LOW;
VGA_B_LOW;
}
}
}
void isr_stop(void) {
if(!v_active) { return; }
VGA_R_LOW;
VGA_G_LOW;
VGA_B_LOW;
}
void isr_update(void) {
VGA_H_LOW;
}
int main(void) {
init();
setup();
while (1) {
loop();
}
return 0;
}
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