Hi All ,
I am using NRF52 , S132 softdevice ............
I need to read a data every 5s (In Timer1 interrupt handler) from I2C slave and sent it via BLE.
But what happen if this I2C read/write is enabled am not able to connect and receive data through BLE. What I think is I2C(has priority high) blocks BLE events. When I try to low the priority to LOW, It is not working with timer (Priority Low), I also tried lowest for I2C but that doesnot work ,,,
What priority I can set for these so that my app work as I expected?? Can I increase the priority for sofdevice events??
Updated 26/4/2016:-
Following is the code I use,
void timer_interrupt(int time_in_sec)
{
NRF_TIMER1->MODE = TIMER_MODE_MODE_Timer;
NRF_TIMER1->TASKS_CLEAR = 1;
NRF_TIMER1->PRESCALER = 9;
NRF_TIMER1->BITMODE = TIMER_BITMODE_BITMODE_32Bit;
NRF_TIMER1->CC[0] = 31250;
NRF_TIMER1->CC[1] = (31250*time_in_sec);
NRF_TIMER1->INTENSET = ((TIMER_INTENSET_COMPARE0_Enabled << TIMER_INTENSET_COMPARE0_Pos)
| (TIMER_INTENSET_COMPARE1_Enabled << TIMER_INTENSET_COMPARE1_Pos)) ;
NRF_TIMER1->SHORTS = (TIMER_SHORTS_COMPARE1_CLEAR_Enabled << TIMER_SHORTS_COMPARE1_CLEAR_Pos);
NVIC_SetPriority(TIMER1_IRQn, APP_IRQ_PRIORITY_LOWEST);
NVIC_EnableIRQ(TIMER1_IRQn);
NRF_TIMER1->TASKS_START = 1;
}
void TIMER1_IRQHandler(void)
{
if ((NRF_TIMER1->EVENTS_COMPARE[1] != 0))
{
NRF_TIMER1->EVENTS_COMPARE[1] = 0; //Clear compare register 0 event
int err_code=0;
err_code=read_motion_sensor(); // This do I2C read
if(err_code != NRF_SUCCESS){
printf("Reading the data failed \r\n");
}
}
}
main() {
ret_code_t err_code;
const nrf_drv_twi_config_t i2c_config = {
.scl = I2C_SCL_PIN,
.sda = I2C_SDA_PIN,
.frequency = NRF_TWI_FREQ_100K,
.interrupt_priority = APP_IRQ_PRIORITY_HIGH
};
err_code = nrf_drv_twi_init(&i2c_instance, &i2c_config,NULL, NULL);
APP_ERROR_CHECK(err_code);
/************** BLE Initialisation *****************/
timer_interrupt(5);------------------------------------------------>interrupt every 5s,
/***************** Start Advertisement **************/
/*************** WFE ****************************/
}
Updated 27/4/2016
uint32_t ble_send_data(uint8_t *data,uint8_t length,uint8_t msgtype)
{
uint32_t err_code;
static uint8_t msg_buff[BLE_NUS_MAX_DATA_LEN];
memset(msg_buff,'\0',BLE_NUS_MAX_DATA_LEN);
msg_buff[HEADER_FIELD]= HEADER;
msg_buff[SEQUENCE_NUMBER_FIELD] = sequence_number;
msg_buff[TYPE_FIELD] = msgtype;
msg_buff[PACKET_SIZE_FIELD]=length;
msg_buff[NUM_PACKET_FIELD]=1;
memcpy(&msg_buff[VALUABLE_INFO_FIELD],data,length);
msg_buff[CRC_FIELD]=CRC8(data,length,7);
err_code=ble_nus_string_send(&m_nus, msg_buff,BLE_NUS_MAX_DATA_LEN);
#if ENABLE_BLE_DEBUG
print_string("Err_Code");
print_hex(err_code,4);
print_string("\r\n");
#endif
sequence_number++; //TODO need to Keep this outside this function
return err_code;
}
Thanks a lot in Advance!!
Thangaraj.
