Ble stack server receiverlink loss

[balaji]

But in button event handler.

i want data to read from eeprom through i2c bus. and send it

through bluetooth stack for every press of buuton 0.

but in master control panel ,its says bluetooth connection loss ,once i press button 0.

Kindly tell me is it not possible to access i2c in button even handler.

static void button_event_handler(uint8_t pin_no) { switch (pin_no) { case HR_INC_BUTTON_PIN_NO:

//m_cur_heart_rate += HEART_RATE_CHANGE; m_cur_heart_rate = data2; dataW1[0]=dataW1[0]+2; twi_master_transfer(addw, dataW1, 2, 1); twi_master_transfer(addr, data1, 2, 0); data2=(data1[0]<<4)|(data1[1]); break;

case HR_DEC_BUTTON_PIN_NO:

//m_cur_heart_rate -= HEART_RATE_CHANGE; //if (m_cur_heart_rate < MIN_HEART_RATE) // { // m_cur_heart_rate = MAX_HEART_RATE; // Loop back // } break;

default: APP_ERROR_HANDLER(pin_no); } }

[Hung Bui]

Could you let me know if you use hardware twi or software twi ? If you use hardware twi (twi_hw_master.c) you would have to modify the code to avoid directly access PPI when the stack is enabled. Otherwise you will receive a hardfault.

You would need to use sd_ppi_* api call instead of direct access to the NRF_PPI->* registers.

I attached here a modified version of the twi_hw_master (SDK4.4) to use when the softdevice is enabled.

twi_hw_master_SD_4_4.c

[balaji]

Hi Hung Bui,

Thanks for your reply,

I am using twi_hw_master.c .

once i used your code , write operation to eeprom is not working fine.

can you give some more details.

Regards Balaji

[balaji]

Hi Hung Bui,

Actually my device connection to eeprom is broken. so i think it is not writing data . sorry

for wrong reply. but now it is writing data to eeprom and reading fine. (i saw by keeping break point).

but once i flash code ,and press the button 0 ,it is not giving advertisement ,so i cant send the data

over bluetooth stack. can you say why advertisement is not coming when i enable soft device api.

(But i am getting advertisement when i use directly ppi address register)

Regards Balaji

[Hung Bui]

Hi Balaji,

Could you send us your project files ?

It should be noted that, when you use twi_hw_master_SD_4_4.c, the softdevice must be enabled before otherwise the sd_ppi_* calls will have no effect and may cause errors.

[balaji]

Hi Hung Bui,

Once i enable sd_devce api . it is working now.

and can you see my thread and reply me

https://devzone.nordicsemi.com/index.php/pheripheral-accessible-while-bluetooth-stack-s-enabled

Regards Balaji