STM8 low power wait mode HSIRDY never unset we are trying tio put the micro in low power wait mode. But the software stops at : while((CLK->ICKCR & CLK_ICKCR_HSIRDY) == CLK_ICKCR_HSIRDY); see file drv_sleep

[CCHAU.2]

..

[AA1]

I didn't see your code, but it seems you are trying to stop current system clock. If this is the case, you can't.

[CCHAU.2]

here is the code :

/* Put system in low power wait mode until next round of test */

#include "Micro_hw_defs.h" //Micro-specific HW configuration

#include "stm8l15x_clk.h"

#include "stm8l15x_flash.h"

//Sleep until woken up by an event

//Can't call non-RAM functions! Only FLASH_PowerRunModeConfig() is certified for that

IN_RAM(void sleep(void))

{

 //1 - Enter Low Power Run Mode

 //Be in RAM, done by the prototype modifier

#ifdef TEST_WITHOUT_MOTHERBOARD

 //Switch clock to LSI

 CLK->CKDIVR = (uint8_t)CLK_SYSCLKDiv_1;

 CLK->SWR = (uint8_t)CLK_SYSCLKSource_LSI;

 while(CLK->SCSR != CLK_SYSCLKSource_LSI);

#else

 //Switch clock to LSE

 CLK->CKDIVR = (uint8_t)CLK_SYSCLKDiv_1;

 CLK->SWR = (uint8_t)CLK_SYSCLKSource_LSE;

 while(CLK->SCSR != CLK_SYSCLKSource_LSE);

#endif

 //Switch off peripherals

 SPI1->CR1 &= (uint8_t)(~SPI_CR1_SPE); //the other drivers are already off when not used

 CLK->PCKENR1 = 0x00;

 CLK->PCKENR2 = 0x00;

 //Switch off HSI

 CLK->ICKCR &= (uint8_t)(~CLK_ICKCR_HSION);

 while((CLK->ICKCR & CLK_ICKCR_HSIRDY) == CLK_ICKCR_HSIRDY); //don't know why it doesn't fall

 //Mask all interrupts

 disableInterrupts();

 //Switch off flash

 FLASH_PowerRunModeConfig(FLASH_Power_IDDQ);

 while((CLK->REGCSR & CLK_REGCSR_EEREADY) == CLK_REGCSR_EEREADY);

 //Configure regulator ultra-low power mode

 CLK->REGCSR |= CLK_REGCSR_REGOFF;

 while((CLK->REGCSR & CLK_REGCSR_REGREADY) == CLK_REGCSR_REGREADY);

 //2 - Enter (and leave on event) Low Power Wait Mode

 wfe();

 //Clear RTC Wake Up Event

 RTC->ISR2 = 0; //We don't use the other bits

 //3 - Exit Low Power Run Mode

 //Switch on main regulator

 CLK->REGCSR &= (uint8_t)(~CLK_REGCSR_REGOFF);

 while((CLK->REGCSR & CLK_REGCSR_REGREADY) == 0);

 //Switch on flash

 FLASH_PowerRunModeConfig(FLASH_Power_On);

 while((CLK->REGCSR & CLK_REGCSR_EEREADY) == 0);

 //Switch on HSI

 CLK->ICKCR |= CLK_ICKCR_HSION;

 while((CLK->ICKCR & CLK_ICKCR_HSIRDY) == 0);

 //Switch clock to HSI

 CLK->CKDIVR = (uint8_t)CLK_SYSCLKDiv_2;

 CLK->SWR = (uint8_t)CLK_SYSCLKSource_HSI;

 while(CLK->SCSR != CLK_SYSCLKSource_HSI);

 //reset interrupt mask

 enableInterrupts();

 //switch on peripherals

 SPI1->CR1 |= SPI_CR1_SPE;

 CLK->PCKENR1 = CLK_GATING_REG1;

 CLK->PCKENR2 = 0x04; //RTC

}

in the datasheet to enter low power run mode you must disable high speed oscillator

[AA1]

You are not following the instructions to switch clock, see RM0031 pages 93 and 94. CLK_SWCR is not used in you code. It seems current system clock is still HSI.

[CCHAU.2]

SWEN is lset to 1 before this function

SWEN==1

SWR=LSI

check SCSR == LSI

and in the register SCSR == LSI

so we are using the LSI clock