/**
* \internal
* \brief Test for AC comparison in single shot mode.
*
* This test checks the single shot comparison of the AC.
* 0.5V is applied to the negative input of AC from internal voltage scaler.
* 0V and 1V from DAC is applied to the positive input and the results
* are verified.
*
* \param test Current test case.
*/
static void run_ac_single_shot_test(const struct test_case *test)
{
volatile uint32_t state = AC_CHAN_STATUS_UNKNOWN;
/* Skip test if initialization failed */
test_assert_true(test, ac_init_success,
"Skipping test due to failed AC initialization");
/* Test for positive input < negative input */
dac_chan_write(&dac_inst, DAC_CHANNEL_0, DAC_VAL_ZERO_VOLT);
delay_ms(1);
ac_chan_trigger_single_shot(&ac_inst, AC_CHAN_CHANNEL_0);
while (!ac_chan_is_ready(&ac_inst, AC_CHAN_CHANNEL_0)) {
}
state = ac_chan_get_status(&ac_inst, AC_CHAN_CHANNEL_0);
state = state & AC_CHAN_STATUS_NEG_ABOVE_POS;
test_assert_true(test, state == AC_CHAN_STATUS_NEG_ABOVE_POS,
"AC comparison failed: POS < NEG not detected");
/* Test for negative input < positive input */
state = AC_CHAN_STATUS_UNKNOWN;
dac_chan_write(&dac_inst, DAC_CHANNEL_0, DAC_VAL_ONE_VOLT);
delay_ms(1);
ac_chan_trigger_single_shot(&ac_inst, AC_CHAN_CHANNEL_0);
while (!ac_chan_is_ready(&ac_inst, AC_CHAN_CHANNEL_0)) {
}
state = ac_chan_get_status(&ac_inst, AC_CHAN_CHANNEL_0);
state = state & AC_CHAN_STATUS_POS_ABOVE_NEG;
test_assert_true(test, state == AC_CHAN_STATUS_POS_ABOVE_NEG,
"AC comparison failed: Interrupt not detected");
ac_chan_clear_status(&ac_inst, AC_CHAN_CHANNEL_0);
}
int main(void)
{
//! [setup_init]
system_init();
configure_ac();
configure_ac_channel();
//! [setup_14]
ac_enable(&ac_instance);
//! [setup_14]
//! [setup_init]
//! [main]
//! [main_1]
ac_chan_trigger_single_shot(&ac_instance, AC_COMPARATOR_CHANNEL);
//! [main_1]
//! [main_2]
uint8_t last_comparison = AC_CHAN_STATUS_UNKNOWN;
//! [main_2]
//! [main_3]
while (true) {
//! [main_3]
//! [main_4]
if (ac_chan_is_ready(&ac_instance, AC_COMPARATOR_CHANNEL)) {
//! [main_4]
//! [main_5]
do {
last_comparison = ac_chan_get_status(&ac_instance,
AC_COMPARATOR_CHANNEL);
} while (last_comparison & AC_CHAN_STATUS_UNKNOWN);
//! [main_5]
//! [main_6]
port_pin_set_output_level(LED_0_PIN,
(last_comparison & AC_CHAN_STATUS_NEG_ABOVE_POS));
//! [main_6]
//! [main_7]
ac_chan_trigger_single_shot(&ac_instance, AC_COMPARATOR_CHANNEL);
//! [main_7]
}
}
//! [main]
}