Hello.

In reference manual it's written that it can be done, however I had no success in doing so.

In my project I want BGM13P22 module to go to sleep after Temu >= 80 dg C and wake-up through reset when Temu <= 60 dg C.

This is the init function:

#define TEMP_EMU_LOW       60
#define TEMP_EMU_HIGH      80

typedef
  union {
    uint32_t l;
    uint16_t w[2];
    uint8_t  b[4];
  } ulong;

struct EmuTemp {
  uint8_t  devInfoCalTemp;
  uint8_t  devInfoEmuTemp;
  uint16_t val;
} emuTemp;

void initEmuTemp()
{
  ulong aux;

  emuTemp.devInfoCalTemp = DEVINFO->CAL >> 16;
  emuTemp.devInfoEmuTemp = DEVINFO->EMUTEMP & 0xFF;


  // TEMPLOW (0.278 for EM01)
  aux.b[0] = (uint8_t) (emuTemp.devInfoEmuTemp - 1.0f * (TEMP_EMU_HIGH - emuTemp.devInfoCalTemp) /
      (0.278f + emuTemp.devInfoEmuTemp * 0.01f) + 0.5f);

  // TEMPHIGH (0.268 for EM234)
  aux.b[1] = (uint8_t) (emuTemp.devInfoEmuTemp - 1.0f * (TEMP_EMU_LOW - emuTemp.devInfoCalTemp) /
      (0.268f + emuTemp.devInfoEmuTemp * 0.01f) + 0.5f);

  // EM4WUEN = 1: Allow device to wake-up from low or high temperature from EM4H
  aux.b[2] = 0x01;

  EMU->TEMPLIMITS = aux.l;


  // Interrupts
  EMU->IFC = (EMU_IFC_TEMPLOW | EMU_IFC_TEMPHIGH);

  // Allow only one of the EMU_TEMP interrupts at a time, depending on temperature
  emuTemp.val = getEmuTemp();
  if (emuTemp.val < TEMP_EMU_HIGH) {
    EMU->IEN |= EMU_IEN_TEMPLOW;
    EMU->IEN &= ~EMU_IEN_TEMPHIGH;
  } else {
    EMU->IEN |= EMU_IEN_TEMPHIGH;
    EMU->IEN &= ~EMU_IEN_TEMPLOW;
  }

  NVIC_ClearPendingIRQ(EMU_IRQn);
  NVIC_SetPriority(EMU_IRQn, 3);
  NVIC_EnableIRQ(EMU_IRQn);
}

This is the IRQ Handler:

void EMU_IRQHandler(void)
{
  if (EMU->IF & EMU_IF_TEMPLOW) {
    EMU->IFC = EMU_IFC_TEMPLOW;

    EMU->IEN &= ~EMU_IEN_TEMPLOW;
    
    // Enable interrupt from falling below the low temperature
    EMU->IFC = EMU_IFC_TEMPHIGH;
    EMU->IEN |= EMU_IEN_TEMPHIGH;

    SLEEP_ForceSleepInEM4();

  } else if (EMU->IF & EMU_IF_TEMPHIGH) {
    EMU->IFC = (EMU_IFC_TEMPLOW | EMU_IFC_TEMPHIGH);

    EMU->IEN &= ~EMU_IEN_TEMPHIGH;
    EMU->IEN |= EMU_IEN_TEMPLOW;

  }
}

The MCU successfully goes to sleep after approx 80 dg C, but never wakes up when temperature falls below 60. By never wakes  up I mean it doesn't even go to reset (I have a test pin configured at the start of the code and program doesn't reach it).

Is there any example of using EMU temperature sensor to wake-up from EM4H?

Thanks.

I think you need to unlatch CMU registers before you can use LFXO or LFRCO after EM4H reset. Try this:

  if (RMU_ResetCauseGet() & RMU_RSTCAUSE_EM4RST) {
    EMU->CMD = EMU_CMD_EM4UNLATCH;
  }

Put it right after CMU_LFXOInit(..), but before selecting or using it for any of clocks.

In reference manual it's written that it can be done, however I had no success in doing so.

In my project I want BGM13P22 module to go to sleep after Temu >= 80 dg C and wake-up through reset when Temu <= 60 dg C.

This is the init function:

#define TEMP_EMU_LOW       60
#define TEMP_EMU_HIGH      80

typedef
  union {
    uint32_t l;
    uint16_t w[2];
    uint8_t  b[4];
  } ulong;

struct EmuTemp {
  uint8_t  devInfoCalTemp;
  uint8_t  devInfoEmuTemp;
  uint16_t val;
} emuTemp;

void initEmuTemp()
{
  ulong aux;

  emuTemp.devInfoCalTemp = DEVINFO->CAL >> 16;
  emuTemp.devInfoEmuTemp = DEVINFO->EMUTEMP & 0xFF;


  // TEMPLOW (0.278 for EM01)
  aux.b[0] = (uint8_t) (emuTemp.devInfoEmuTemp - 1.0f * (TEMP_EMU_HIGH - emuTemp.devInfoCalTemp) /
      (0.278f + emuTemp.devInfoEmuTemp * 0.01f) + 0.5f);

  // TEMPHIGH (0.268 for EM234)
  aux.b[1] = (uint8_t) (emuTemp.devInfoEmuTemp - 1.0f * (TEMP_EMU_LOW - emuTemp.devInfoCalTemp) /
      (0.268f + emuTemp.devInfoEmuTemp * 0.01f) + 0.5f);

  // EM4WUEN = 1: Allow device to wake-up from low or high temperature from EM4H
  aux.b[2] = 0x01;

  EMU->TEMPLIMITS = aux.l;


  // Interrupts
  EMU->IFC = (EMU_IFC_TEMPLOW | EMU_IFC_TEMPHIGH);

  // Allow only one of the EMU_TEMP interrupts at a time, depending on temperature
  emuTemp.val = getEmuTemp();
  if (emuTemp.val < TEMP_EMU_HIGH) {
    EMU->IEN |= EMU_IEN_TEMPLOW;
    EMU->IEN &= ~EMU_IEN_TEMPHIGH;
  } else {
    EMU->IEN |= EMU_IEN_TEMPHIGH;
    EMU->IEN &= ~EMU_IEN_TEMPLOW;
  }

  NVIC_ClearPendingIRQ(EMU_IRQn);
  NVIC_SetPriority(EMU_IRQn, 3);
  NVIC_EnableIRQ(EMU_IRQn);
}

This is the IRQ Handler:

void EMU_IRQHandler(void)
{
  if (EMU->IF & EMU_IF_TEMPLOW) {
    EMU->IFC = EMU_IFC_TEMPLOW;

    EMU->IEN &= ~EMU_IEN_TEMPLOW;
    
    // Enable interrupt from falling below the low temperature
    EMU->IFC = EMU_IFC_TEMPHIGH;
    EMU->IEN |= EMU_IEN_TEMPHIGH;

    SLEEP_ForceSleepInEM4();

  } else if (EMU->IF & EMU_IF_TEMPHIGH) {
    EMU->IFC = (EMU_IFC_TEMPLOW | EMU_IFC_TEMPHIGH);

    EMU->IEN &= ~EMU_IEN_TEMPHIGH;
    EMU->IEN |= EMU_IEN_TEMPLOW;

  }
}

The MCU successfully goes to sleep after approx 80 dg C, but never wakes up when temperature falls below 60. By never wakes  up I mean it doesn't even go to reset (I have a test pin configured at the start of the code and program doesn't reach it).

Is there any example of using EMU temperature sensor to wake-up from EM4H?

Thanks.

In reference manual it's written that it can be done, however I had no success in doing so.

In my project I want BGM13P22 module to go to sleep after Temu >= 80 dg C and wake-up through reset when Temu <= 60 dg C.

This is the init function:

#define TEMP_EMU_LOW       60
#define TEMP_EMU_HIGH      80

typedef
  union {
    uint32_t l;
    uint16_t w[2];
    uint8_t  b[4];
  } ulong;

struct EmuTemp {
  uint8_t  devInfoCalTemp;
  uint8_t  devInfoEmuTemp;
  uint16_t val;
} emuTemp;

void initEmuTemp()
{
  ulong aux;

  emuTemp.devInfoCalTemp = DEVINFO->CAL >> 16;
  emuTemp.devInfoEmuTemp = DEVINFO->EMUTEMP & 0xFF;


  // TEMPLOW (0.278 for EM01)
  aux.b[0] = (uint8_t) (emuTemp.devInfoEmuTemp - 1.0f * (TEMP_EMU_HIGH - emuTemp.devInfoCalTemp) /
      (0.278f + emuTemp.devInfoEmuTemp * 0.01f) + 0.5f);

  // TEMPHIGH (0.268 for EM234)
  aux.b[1] = (uint8_t) (emuTemp.devInfoEmuTemp - 1.0f * (TEMP_EMU_LOW - emuTemp.devInfoCalTemp) /
      (0.268f + emuTemp.devInfoEmuTemp * 0.01f) + 0.5f);

  // EM4WUEN = 1: Allow device to wake-up from low or high temperature from EM4H
  aux.b[2] = 0x01;

  EMU->TEMPLIMITS = aux.l;


  // Interrupts
  EMU->IFC = (EMU_IFC_TEMPLOW | EMU_IFC_TEMPHIGH);

  // Allow only one of the EMU_TEMP interrupts at a time, depending on temperature
  emuTemp.val = getEmuTemp();
  if (emuTemp.val < TEMP_EMU_HIGH) {
    EMU->IEN |= EMU_IEN_TEMPLOW;
    EMU->IEN &= ~EMU_IEN_TEMPHIGH;
  } else {
    EMU->IEN |= EMU_IEN_TEMPHIGH;
    EMU->IEN &= ~EMU_IEN_TEMPLOW;
  }

  NVIC_ClearPendingIRQ(EMU_IRQn);
  NVIC_SetPriority(EMU_IRQn, 3);
  NVIC_EnableIRQ(EMU_IRQn);
}

This is the IRQ Handler:

void EMU_IRQHandler(void)
{
  if (EMU->IF & EMU_IF_TEMPLOW) {
    EMU->IFC = EMU_IFC_TEMPLOW;

    EMU->IEN &= ~EMU_IEN_TEMPLOW;
    
    // Enable interrupt from falling below the low temperature
    EMU->IFC = EMU_IFC_TEMPHIGH;
    EMU->IEN |= EMU_IEN_TEMPHIGH;

    SLEEP_ForceSleepInEM4();

  } else if (EMU->IF & EMU_IF_TEMPHIGH) {
    EMU->IFC = (EMU_IFC_TEMPLOW | EMU_IFC_TEMPHIGH);

    EMU->IEN &= ~EMU_IEN_TEMPHIGH;
    EMU->IEN |= EMU_IEN_TEMPLOW;

  }
}

The MCU successfully goes to sleep after approx 80 dg C, but never wakes up when temperature falls below 60.

Is there any example of using EMU temperature sensor to wake-up from EM4H?

Thanks.

I think you need to unlatch CMU registers before you can use them again after EM4H reset. Try this:

  if (RMU_ResetCauseGet() & RMU_RSTCAUSE_EM4RST) {
    EMU->CMD = EMU_CMD_EM4UNLATCH;
  }

Put it right after CMU_LFXOInit(..), but before selecting or using it for any of clocks.

The stack makes a copy of the data, so if you need to update the data you can't just go and change your original data buffer which belongs to the application.

I unserstand this. I'm just saying it would be more convenient (from the user pov) if stack didn't copy data, but used the passed array's reference and its length from the user application.

I don't remember having this issue with SDK 2.11.x.x.

Also it would have been better if you hadn't needed to update the advertiser data buffer everytime with gecko_cmd_le_gap_bt5_set_adv_data() function. It already has all the information with reference to a buffer and data length.