int main(void)
{
rcc_clock_setup_in_hse_16mhz_out_72mhz();
gpio_setup();
nvic_setup();
gpio_clear(GPIOB, GPIO7); /* LED1 on */
gpio_set(GPIOB, GPIO6); /* LED2 off */
rcc_peripheral_enable_clock(&RCC_APB1ENR, RCC_APB1ENR_TIM2EN);
/* the goal is to let the LED2 glow for a second and then be off for a second */
/* Set timer start value */
TIM_CNT(TIM2) = 1;
/* Set timer prescaler. 72MHz/1440 => 50000 counts per second */
TIM_PSC(TIM2) = 1440;
/* End timer value. If this value is reached an interrupt is generated */
TIM_ARR(TIM2) = 50000;
/* Update interrupt enable */
TIM_DIER(TIM2) |= TIM_DIER_UIE;
/* Start timer */
TIM_CR1(TIM2) |= TIM_CR1_CEN;
while(1); /* Halt. */
return 0;
}
int main ( void ) {
#if 1 // go for 120MHz, built into libopencm3
// requires: external 8MHz crystal on pin5/6 with associated caps to ground
rcc_clock_setup_hse_3v3 ( &hse_8mhz_3v3 [ CLOCK_3V3_120MHZ ] );
#endif
#if 1 // fill framebuffer with offset squares
//unsigned char i;
unsigned int x, y;
unsigned char v;
for ( y = 0; y < FBHEIGHT; y++ ) {
//i = 0;
i = ( y / 10 ) % 5;
for ( x = 0; x < FBWIDTH; x++ ) {
if ( x % 10 == 0 ) {
i++;
}
if ( i == 0 ) {
v = (unsigned char) GPIO0;
} else if ( i == 1 ) {
v = (unsigned char) GPIO1;
} else if ( i == 2 ) {
v = (unsigned char) GPIO2;
} else if ( i == 3 ) {
v = (unsigned char) GPIO3;
} else if ( i == 4 ) {
v = (unsigned char) GPIO4;
} else if ( i == 5 ) {
v = (unsigned char) GPIO5;
} else {
i = 0;
v = (unsigned char) GPIO0;
}
*( framebuffer + ( y * FBWIDTH ) + x ) = v;
//*( framebuffer + ( y * FBWIDTH ) + x ) = (unsigned char) 0;
//*( framebuffer + ( y * FBWIDTH ) + x ) = (unsigned char)( GPIO3 );
//*( framebuffer + ( y * FBWIDTH ) + x ) = (unsigned char)( GPIO5 );
//*( framebuffer + ( y * FBWIDTH ) + x ) = (unsigned char)( GPIO1 | GPIO3 );
//*( framebuffer + ( y * FBWIDTH ) + x ) = (unsigned char)( GPIO1 | GPIO0 );
//*( framebuffer + ( y * FBWIDTH ) + x ) = (unsigned char)( GPIO0 | GPIO1 );
//*( framebuffer + ( y * FBWIDTH ) + x ) = (unsigned char)( GPIO0 | GPIO1 | GPIO2 | GPIO3 );
//*( framebuffer + ( y * FBWIDTH ) + x ) = (unsigned char)( GPIO2 | GPIO3 );
//*( framebuffer + ( y * FBWIDTH ) + x ) = (unsigned char)( GPIO4 | GPIO5 );
} // x
} // y
#endif
#if 0 // fill framebuffer with vertical stripes of all colours (1px per colour)
//unsigned char i;
unsigned int x, y;
unsigned char v;
for ( y = 0; y < FBHEIGHT; y++ ) {
i = 0;
for ( x = 0; x < FBWIDTH; x++ ) {
*( framebuffer + ( y * FBWIDTH ) + x ) = i / 6;
//*( framebuffer + ( y * FBWIDTH ) + x ) = (unsigned char)( GPIO0 | GPIO1 );
i++;
} // x
} // y
#endif
#if 0 // vertical strip every 10 pixels
//unsigned char i;
unsigned int x, y;
for ( y = 0; y < FBHEIGHT; y++ ) {
i = 0;
for ( x = 0; x < FBWIDTH; x++ ) {
if ( i >= 9 ) {
*( framebuffer + ( y * FBWIDTH ) + x ) = GPIO0;
}
if ( i == 12 ) {
i = 0;
}
i++;
} // x
} // y
#endif
gpio_setup();
/* Enable TIM2 clock. */
rcc_peripheral_enable_clock(&RCC_APB1ENR, RCC_APB1ENR_TIM2EN);
//__enable_irq();
//cm_enable_interrupts();
nvic_setup();
timer2_setup();
dma_setup();
gpio_set ( GPIOB, GPIO12 );
TIM_SR(TIM2) &= ~TIM_SR_UIF; /* Clear interrrupt flag. */
while ( 1 ) {
__asm__("nop");
} // while forever
return 0;
}
