int main ( )
{
/* Create a HWA context to collect the hardware configuration
* Preload this context with RESET values
*/
hwa( begin_from_reset );
/* Have the CPU enter idle mode when the 'sleep' instruction is executed.
*/
hwa( configure, core0,
sleep, enabled,
sleep_mode, idle );
/* Configure LED pin
*/
hwa( configure, PIN_LED,
mode, digital_output );
/* Configure analog input pin in analog mode (disable digital input buffer)
* and enable the internal pull-up resistor
*/
hwa( configure, PIN_ANALOG_INPUT,
mode, analog_input_pullup );
/* Check that the counter can handle the top value. This must be done
* here since the C preprocessor does not allow floats in expressions.
*/
if ( COUNT_TOP > ((1UL<<HW_BITS(COUNTER))-1) )
HWA_ERR("PWM_COUNTER can not afford PWM_PERIOD.") ;
/* Configure the counter prescaler
*/
hwa( configure, (COUNTER,prescaler),
clock, ioclk );
/* Configure the counter to overflow periodically and trigger an interrupt
* The counter overflow ISR manages the compare IRQ
*/
hwa( configure, COUNTER,
clock, ioclk / COUNTER_CLK_DIV,
direction, up_loop,
bottom, 0,
top, TOP_OBJ,
// overflow, after_top,
);
hwa( write, (COUNTER, TOP_OBJ), COUNT_TOP );
hwa( turn, irq(COUNTER,overflow), on );
/* Configure the ADC to make a single conversion and trigger an
* IRQ. The ISR will start a new conversion after its hard job is done.
*/
hwa( configure, adc0,
clock, ioclk / ADC_CLK_DIV,
trigger, manual,
vref, vcc,
align, right,
input, PIN_ANALOG_INPUT );
hwa( turn, irq(adc0), on );
hwa( trigger, adc0 );
/* Write this configuration into the hardware
*/
hwa( commit );
hw( enable_interrupts );
for(;;)
hw( sleep_until_irq );
return 0 ;
}
int main ( )
{
/* Create a HWA context to collect the hardware configuration
* Preload this context with RESET values
*/
hwa_begin_from_reset();
/* Have the CPU enter idle mode when the 'sleep' instruction is executed.
*/
hwa( configure, core0,
sleep, enabled,
sleep_mode, idle );
/* Configure LED pin
*/
hwa( configure, PIN_LED, direction, output );
/* If REFERENCE is a pin, configure it in analog mode (disable its digital
* input buffer)
*/
#if HW_ID(REFERENCE)
hwa( configure, REFERENCE,
mode, analog,
direction, input );
#endif
/* Configure INPUT_NEG pin in analog mode (disable digital input buffer)
*/
hwa( configure, PIN_ANALOG_INPUT,
mode, analog,
direction, input );
/* Check that the counter can handle the ON_TIME value. This must be done
* here since the C preprocessor does not allow floats in expressions.
*/
if ( ON_TIME_COUNT > ((1UL<<HW_BITS(COUNTER))-1) )
HWA_ERR("COUNTER can not afford ON_TIME.") ;
/* Configure the counter to count from 0 to max
*/
hwa( configure, COUNTER,
clock, prescaler_output(COUNTER_CLK_DIV),
countmode, up_loop );
/* Prepare the compare value for the PIN_LED pulse
*/
hwa( write, HW_RELATIVE(COUNTER,COMPARE), ON_TIME_COUNT );
/* Configure the analog comparator
*/
hwa( configure, acmp0,
edge, EDGE,
positive_input, REFERENCE,
negative_input, PIN_ANALOG_INPUT );
hwa( turn, HW_IRQ(acmp0), on );
/* Write this configuration into the hardware
*/
hwa_commit();
hw_enable_interrupts();
for(;;)
hw_sleep();
return 0 ;
}
