Implementing Low power modes

[Imlerih]

I'm trying to implement standby and stop modes on this core for STM32F103 mcu. I had no isues with standby mode, it wirks properly wit power consumption about of 46 uA. Here it's sources:

void lp_init() { //enable power clock RCC_BASE->APB1ENR |= RCC_APB1ENR_PWREN; delay(10);

/* Enable access to RTC and backup registers */
PWR_BASE->CR |= PWR_CR_DBP;

///* Check if the system was resumed from StandBy mode */
if (PWR_BASE->CSR & SCB_SCR_SLEEPONEXIT)
{
    PWR_BASE->CSR &= ~SCB_SCR_SLEEPONEXIT;
}

//Clear wakeup flag
PWR_BASE->CR |= PWR_CR_CWUF;

}

void standby() { stop(); return; lp_init(); nvic_globalirq_disable();

SCB_BASE->SCR |= SCB_SCR_SLEEPDEEP;
//Power down deepsleep
PWR_BASE->CR |= PWR_CR_PDDS;
//Enable wakeup pin 
PWR_BASE->CSR |= PWR_CSR_EWUP;
asm volatile("WFI":::"memory");

}

But there are difficuelties with stop mode. It consumes 18 mA when entered, must be mutch less. Here the sources:

void stop() { lp_init();

for (int i = PA0; i <= PC15; i++)
{
    pinMode(i, INPUT);
    digitalWrite(i, 0);
}

systick_disable();

bitClear(PWR_BASE->CR, PWR_CR_PDDS);
//Low-power deepsleep
bitSet(PWR_BASE->CR, PWR_CR_LPDS);

bitSet(SCB_BASE->SCR, SCB_SCR_SLEEPDEEP);

asm volatile("WFI":::"memory");

bitClear(SCB_BASE->SCR, SCB_SCR_SLEEPDEEP);

//setup clock back to HSE after exiting stop mode
setup_clocks();
systick_enable();

}

[rogerclarkmelbourne]

Try posting to www.stm32duino.com or STM's community forum