int main(void)
{
// Configure pin 7 on EXT1 as output
ioport_configure_pin(EXT1_PIN_7,IOPORT_DIR_OUTPUT);
sysclk_init();
board_init();
// Start TC and configure pin to get PWM output to LED on IO1 Xplained Pro extension board
tc_init();
while (1) {
struct pll_config pcfg;
/*
* Initial state: Running from RC32M prescalers with 16x
* prescaling of CLKsys, 2x prescaling for CLKper2 and 2x
* prescaling for CLKper.
*/
wait_for_btn_press();
/*
* Prescale CLKsys by 128x, prescale all peripheral clocks by 1.
*/
sysclk_set_prescalers(SYSCLK_PSADIV_128, SYSCLK_PSBCDIV_1_1);
wait_for_btn_press();
/*
* Switch to RC2M with 4x prescaling of CLKsys, 4x prescaling
* for CLKper2 and 1x prescaling for CLKper.
*/
osc_enable(OSC_ID_RC2MHZ);
do {} while (!osc_is_ready(OSC_ID_RC2MHZ));
sysclk_set_source(SYSCLK_SRC_RC2MHZ);
sysclk_set_prescalers(SYSCLK_PSADIV_4, SYSCLK_PSBCDIV_4_1);
osc_disable(OSC_ID_RC32MHZ);
wait_for_btn_press();
/*
* Switch to PLL with RC2M as reference and 4x multiplier.
* Prescale CLKsys by 128x, and all peripheral clocks by 1x.
*/
pll_config_init(&pcfg, PLL_SRC_RC2MHZ, 1, 4);
pll_enable(&pcfg, 0);
do {} while (!pll_is_locked(0));
sysclk_set_prescalers(SYSCLK_PSADIV_128, SYSCLK_PSBCDIV_1_1);
sysclk_set_source(SYSCLK_SRC_PLL);
wait_for_btn_press();
/*
* Go back to the initial state and start over.
*/
osc_enable(OSC_ID_RC32MHZ);
do {} while(!osc_is_ready(OSC_ID_RC32MHZ));
sysclk_set_source(SYSCLK_SRC_RC32MHZ);
sysclk_set_prescalers(SYSCLK_PSADIV_16, SYSCLK_PSBCDIV_2_2);
pll_disable(0);
osc_disable(OSC_ID_RC2MHZ);
}
}
/**
* \brief cleanup pll/dfll test
*
* \param test Current test case.
*/
static void cleanup_pll_dfll_test(const struct test_case *test)
{
#ifdef CONFIG_PLL0_SOURCE
pll_disable(PLL0);
#endif
#ifdef CONFIG_PLL1_SOURCE
pll_disable(PLL1);
#endif
#ifdef CONFIG_DFLL0_SOURCE
dfll_disable_closed_loop(0);
osc_disable(OSC_ID_RCSYS);
#endif
}
/**
* \brief Disable the USB clock.
*
* \note This implementation does not switch off the PLL, it just turns off the
* USB clock.
*/
void sysclk_disable_usb(void)
{
if (CONFIG_SYSCLK_SOURCE != SYSCLK_SRC_UPLLCK) {
pll_disable(1);
}
}
/**
* \brief Disable full speed USB clock.
*
* \note This implementation does not switch off the PLL, it just turns off the USB clock.
*/
void sysclk_disable_usb(void)
{
pll_disable(1);
}