void execute(){
/* Obtaing the address of the frame buffer structure */
int fbInfoAddress = InitialiseFrameBuffer(1024, 768, 16);
/* if GPU has accepted our request to create a frame buffer then*/
if( fbInfoAddress != 0 ){
int fbAddr, y=0, x=0, color;
while( 1 ){
/* Obtaing the pointer to the frame buffer from the fram buffer structure */
fbAddr = *((unsigned int*)(fbInfoAddress+32));
y = 768;
while( y != 0 ){
x = 1024;
while( x != 0 ){
/* Drwaing the pixel by putting in the color information at location pointed by frame buffer */
*((unsigned int*)(fbAddr)) = color;
fbAddr = (fbAddr+2);
x = x-1;
}
y = y-1;
/* Changing the color */
color = color+1;
}
}
}
/* If GPU has denied our request to create a fram buffer then */
else{
/* Turn on the ACT LED */
SetGpioFunction(16,1);
SetGpio(16, 0);
while(1);
}
}
int main()
{
volatile uint32_T* systimer_clo = (volatile uint32_T*) SYSTIM_CLO;
volatile uint32_T* systimer_cs = (volatile uint32_T*) SYSTIM_CS;
uint32_T* systimer_c1 = (uint32_T*) SYSTIM_C1;
uint32_T* irq_enable1 = (uint32_T*) IRQ_ENABLE1;
uint32_T* gpiocntrl = (uint32_T*) GPFSEL1;
uint32_T* gpioclear = (uint32_T*) GPCLR0;
FrameBufferInfo_T* fbInfoAddr;
uint32_T* tag_cmdline;
uint32_T ii;
uint8_T output[] = "Test Eins\n\t1 23 45";
// Set gpio 16 to output
*gpiocntrl = 1<<18;
// Activate system timer c1
*systimer_c1 = *systimer_clo + TIME_TICK;
*systimer_cs = 0x2;
// Enable Interrupts for system timer c1
*irq_enable1 = 0x2;
// Initialise Frame Buffer
fbInfoAddr = InitialiseFrameBuffer(XW, YW, 16);
if (fbInfoAddr == NULL)
{
// signal error by lighting ACT and stopping
*gpioclear = 1<<16;
while(1);
}
SetGraphicsAddress(fbInfoAddr);
SetForeColour(0xffff);
DrawLine(0,0,XW-1,0);
DrawLine(0,10,XW-1,10);
clearScreen();
for (ii = 0; ii < 26; ii++)
DrawCharacter(0x41+ii, ii*8, 0);
for (ii = 0; ii < 26; ii++)
DrawCharacter(0x41+ii, 4 + ii*8, 16);
DrawLine(0,50,XW-1,30);
DrawString(output, 17, 20, YW/2);
clearScreen();
// Find cmdline tag
tag_cmdline = FindTag(9);
DrawString((uint8_T*)(tag_cmdline+2), (*tag_cmdline) - 2, 0, 0);
// Enable Interrupts on ARM
ENABLE_IRQ;
// wait until sytick reaches 5 ms
while(systick < 5000000/TIME_TICK);
while(1) {
uint16_T x;
uint16_T y;
uint16_T x_old;
uint16_T y_old;
uint32_T colour;
uint32_T error;
uint32_T message[QUEUE_DIM];
if (readQueue(0, message)) {
x = message[0] % XW; // time in ms: 1ms is 1 px, wrapped around screen width
y = message[1];
if (x > x_old) {
DrawLine(x_old, y_old, x, y);
} else {
clearScreen();
SetForeColour(colour);
colour--;
for (ii = 0; ii < 64; ii++)
DrawCharacter(0x41+ii, ii*8, 0);
}
x_old = x;
y_old = y;
}
};
return 1;
}