Hi,
I am trying to make a low-power application using an LPC11U67 in combination with FreeRTOS.
I've implemented the power-down functionality based on the LPCOpen examples_11u6x periph_pmu code. The MCU needs to wake up with a pin interrupt which works with both PININT and GPIOGP interrupts. When FreeRTOS is not implemented, the MCU goes into power-down mode and wakes up on an interrupt, so I know that part is not the issue.
Power-down code:
/* BOD and WDT are not needed */
Chip_SYSCTL_SetDeepSleepPD(SYSCTL_DEEPSLP_BOD_PD | SYSCTL_DEEPSLP_WDTOSC_PD);
Chip_SYSCTL_SetWakeup(~(SYSCTL_SLPWAKE_IRCOUT_PD | SYSCTL_SLPWAKE_IRC_PD | SYSCTL_SLPWAKE_FLASH_PD | SYSCTL_SLPWAKE_SYSOSC_PD | SYSCTL_SLPWAKE_SYSPLL_PD));
Chip_PMU_PowerDownState(LPC_PMU);
PININT:
Chip_GPIO_SetPinDIRInput(LPC_GPIO, 1, 20);
Chip_Clock_EnablePeriphClock(SYSCTL_CLOCK_PINT);
Chip_SYSCTL_SetPinInterrupt(PININT0_INDEX, PININT0_PORT, PININT0_PIN);
Chip_SYSCTL_EnableStartPin(PININT0_INDEX);
Chip_PININT_ClearIntStatus(LPC_PININT, PININTCH0);
Chip_PININT_SetPinModeEdge(LPC_PININT, PININTCH0);
Chip_PININT_EnableIntLow(LPC_PININT, PININTCH0);
NVIC_ClearPendingIRQ(PIN_INT0_IRQn);
NVIC_EnableIRQ(PIN_INT0_IRQn);
With FreeRTOS there is one task that is woken up using a software timer. When the task is not running for a certain amount of time, the idle task is running, the power-down mode should be entered from the vApplicationIdleHook. But when the power-down code is called in the vApplicationIdleHook the MCU goes to power down and won't wake up with the interrupt that had previously worked without FreeRTOS. Furthermore, when trying to put the MCU in sleep mode from the idle hook using the
Chip_PMU_SleepState(LPC_PMU);
command, the program executes the code but does not enter sleep mode. Instead, it just continues as if there was no sleep command.
How would I go about putting the MCU to power-down mode from the idle task i having the system resume on a PININT?
Thanks in advance!
