good quality vga leaf logo; usb+systick disabled

refactored timers and added interrupt behavior. see notes and
comments...  also includes a crude vga hack that doesn't use timers.

1 files changed, 262 insertions, 0 deletions

diff --git a/examples/vga.cpp b/examples/vga.cpp
new file mode 100644
index 0000000..c2e61ae
--- /dev/null
+++ b/examples/vga.cpp
@@ -0,0 +1,262 @@
+
+#include "wirish.h"
+
+/*
+D5     PB6         -      TIM4_CH1       I2C1_SCL   -           -           Y
+D6     PA8         -      TIM1_CH1       -          USART1_CK   -           Y
+D7     PA9         -      TIM1_CH2       -          USART1_TX   -           Y
+D8     PA10        -      TIM1_CH3       -          USART1_RX   -           Y
+D9     PB7         -      TIM4_CH2       I2C1_SDA   -           -           Y
+*/
+
+//gpio_write_bit(GPIOB_BASE, 6, 1); // VGA_R
+//gpio_write_bit(GPIOB_BASE, 6, 0); 
+
+//(GPIOA_BASE)->BSRR = BIT(8);
+//asm volatile("nop");
+//(GPIOA_BASE)->BRR = BIT(8);
+/*
+    gpio_write_bit(GPIOB_BASE, 6, 1); // VGA_R
+    gpio_write_bit(GPIOB_BASE, 6, 0); 
+    gpio_write_bit(GPIOA_BASE, 8, 1); // VGA_G
+    gpio_write_bit(GPIOA_BASE, 8, 0); 
+    gpio_write_bit(GPIOA_BASE, 9, 1); // VGA_B
+    gpio_write_bit(GPIOA_BASE, 9, 0); 
+    gpio_write_bit(GPIOA_BASE, 10, 1); // VGA_V
+    gpio_write_bit(GPIOA_BASE, 10, 0); 
+    gpio_write_bit(GPIOB_BASE, 7, 1); // VGA_H
+    gpio_write_bit(GPIOB_BASE, 7, 0); 
+*/
+
+#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);
+}
+
+int toggle = 0;
+uint16  x = 0;
+uint16 y = 0;
+uint8 v_active = 1;
+GPIO_Port *portb = GPIOB_BASE;
+
+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_HIGH;
+    //delayMicroseconds(2);
+    //gpio_write_bit(GPIOA_BASE, 8, 1); // VGA_G
+    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;
+}
+
+void loop() {
+    /* 
+    toggle ^= 1;
+    digitalWrite(LED_PIN, toggle);
+    delay(100);
+    Serial2.println("HIHIHI!");
+    */ 
+    //for(y=0; y<480; y++) {
+   /* 
+    for(y=0; y<160; y++) {
+        VGA_R_LOW;
+        VGA_H_LOW;
+        delayMicroseconds(3);
+        VGA_H_HIGH;
+        VGA_R_HIGH;
+        delayMicroseconds(8);
+        VGA_G_HIGH;
+        delayMicroseconds(10);
+        VGA_B_HIGH;
+        delayMicroseconds(10);
+        VGA_R_LOW;
+        VGA_B_LOW;
+        VGA_G_LOW;
+        //VGA_G_HIGH;
+    }
+    for(y=0; y<160; y++) {
+        VGA_R_LOW;
+        VGA_H_LOW;
+        delayMicroseconds(3);
+        VGA_H_HIGH;
+        VGA_G_HIGH;
+        delayMicroseconds(8);
+        VGA_R_HIGH;
+        delayMicroseconds(10);
+        VGA_B_HIGH;
+        delayMicroseconds(10);
+        VGA_R_LOW;
+        VGA_B_LOW;
+        VGA_G_LOW;
+        //VGA_G_HIGH;
+    }
+    for(y=0; y<160; y++) {
+        VGA_R_LOW;
+        VGA_H_LOW;
+        delayMicroseconds(3);
+        VGA_H_HIGH;
+        VGA_B_HIGH;
+        delayMicroseconds(8);
+        VGA_G_HIGH;
+        delayMicroseconds(10);
+        VGA_R_HIGH;
+        delayMicroseconds(10);
+        VGA_R_LOW;
+        VGA_B_LOW;
+        VGA_G_LOW;
+        //VGA_G_HIGH;
+    }
+    for(y=0; y<11; y++) {
+        VGA_R_LOW;
+        VGA_H_LOW;
+        delayMicroseconds(3);
+        VGA_R_LOW;
+        VGA_H_HIGH;
+        delayMicroseconds(28);
+    }
+    VGA_V_LOW;
+    for(y=0; y<2; y++) {
+        VGA_R_LOW;
+        VGA_H_LOW;
+        delayMicroseconds(3);
+        VGA_R_LOW;
+        VGA_H_HIGH;
+        delayMicroseconds(28);
+    }
+    VGA_V_HIGH;
+    for(y=0; y<30; y++) {
+        VGA_R_LOW;
+        VGA_H_LOW;
+        delayMicroseconds(3);
+        VGA_R_LOW;
+        VGA_H_HIGH;
+        delayMicroseconds(28);
+    }
+    */
+
+}
+
+
+int main(void) {
+    init();
+    setup();
+
+    while (1) {
+        loop();
+    }
+    return 0;
+}