int main ( )
{
hwa_begin_from_reset();
hwa( power, HW_RELATIVE(LED1,port), on );
hwa( configure, LED1,
mode, digital,
direction, output,
frequency, 50MHz );
hwa_commit();
for(;;) {
hwa( write, LED1, 1 );
hwa_commit();
hw_waste_cycles( PERIOD/2 * HW_DEVICE_HSIHZ );
hwa( write, LED1, 0 );
hwa_commit();
hw_waste_cycles( PERIOD/2 * HW_DEVICE_HSIHZ );
}
}
int main ( )
{
hwa_begin_from_reset();
/* Start the high-speed external oscillator.
*/
hwa( power, hse, on );
/* Configure the PLL source and multiplier (must be done before it is enabled).
*/
hwa( configure, pll,
source, hse/2,
multiplier, SYSHZ/HW_DEVICE_HSEHZ );
/* Prepare the connection of the sysclk to the pll. The hardware will wait for
* the PLL to be locked before actually switching.
*/
hwa( connect, sysclk, pll );
hwa_commit();
/* Turn the PLL on.
*/
hwa( turn, pll, on );
hwa_commit();
/* Wait for the PLL to be locked.
*/
while ( ! hw(stat,pll).ready ) {}
/* Now that the SYSCLK is driven by the PLL, the HSI can be stopped.
*/
hwa( power, hsi, off );
/* Configure the AHB
*/
hwa( configure, ahb,
clock, sysclk,
prescaler, SYSHZ/COREHZ );
hwa_commit();
/* Configure the GPIO pin
*/
hwa( power, HW_RELATIVE(LED1,port), on );
hwa_commit();
hwa( configure, LED1,
mode, digital,
direction, output,
frequency, 50MHz );
hwa_commit();
/* Wait for the HSI to actually stop.
*/
while ( hw(stat,hsi).ready ) {}
for(;;) {
hw( toggle, LED1 );
hw_waste_cycles( PERIOD*COREHZ/2 );
}
}
int main ( )
{
hwa( begin_from_reset );
/* After RESET, the core is clocked at 8 MHz by the HSI RC oscillator.
*
* * Start the high-speed external oscillator.
* * Configure the PLL source and multiplier (must be done before it is
* enabled).
* * Prepare the connection of the sysclk to the pll. The hardware waits for
* the clocks to be stable before switching.
*
* Alternately, we could check ourselves the clocks:
* while ( !hw(stat,hse).ready ) {} : waits for the HSE to be stable.
* while ( !hw(stat,pll).ready ) {} : waits for the PLL to be locked.
*/
hwa( power, hse, on );
hwa( connect, pll, hse );
hwa( write, pll, (SYSHZ / HW_DEVICE_HSEHZ) );
hwa( connect, sysclk, pll );
hwa( commit );
/* Now turn the PLL on and the hardware will use it as sysclk when the PLL is
* locked.
*/
hwa( turn, pll, on );
hwa( commit );
/* Power the GPIO port
*/
hwa( power, (LED1,port), on );
/* Configure the GPIO pin
*/
hwa( configure, LED1,
mode, digital_output,
frequency, lowest );
hwa( commit );
for(;;) {
hw( toggle, LED1 );
hw_waste_cycles( PERIOD/2 * SYSHZ );
}
}
