• How to compare ACPI states (Sx, Cx) with ARM Cortex-A processor states (Standby, Retention, Power Down, Dormant Mode, Hotplug, Stop, Deep Sleep) ?
    Hello, I'm a student and I'm interested in how to compare ACPI Sleep States (Sx) and processor power states (Cx) with ARM Cortex-A states e.g. Standby, Retention, Power Down, Dormant Mode, Hotplug, Stop...
  • How to properly measure sleep time with DWT?
    Hello everyone, I need to measure sleep time of my Cortex-M4 processor (STM32F4xx). I looked at DWT where I also use normal tick counter and I enabled SLEEPCNT counter. However, I noticed that it is 8...
  • A53 core does not enter sleep state with WFE
    I am trying to use WFE on Linux user space. I have the following code, while(1) { if (condition==TRUE) break; __asm__ __volatile__ ("wfe" : : : "memory"); ... } It seems the core never...
  • I would like to run linux on cortex-M MCU in Stm32mp157-EV but i don't know what's wrong?
    dear engineers, i can run linux on stm32f429 mcu without any problem, but it failed on Cortex-M MCU in stm32mp157 board. After many hours i realize: error happens in below function void __meminit...
  • Timer not working in stm32f401re
    i want to setup timer in STM32F401RE and i already have this code: int main(void) { TIM1_init(); while (1) {} } /// initialize TIM1 /// timer TIM1 channel 2 is configed to generate PWM at 1kHz. the...