变化的连接间隔

Hi support,

我的程序大概的逻辑是外挂ADC每4ms采一次数据，采集完毕后通过中断告诉MCU 14580，MCU开辟一个环形缓冲区来存储ADC result，当有5个result时启动数据发送（notify），数据大小20bytes，即每20ms有一包packet要发送，发送前先检查GATTC_CMP_EVT的到来，connection interval设置为10-20ms，实际测试发现，当连接后不发数据的时候，connection interval为规律的18ms(大概)，当启动notify时，connection interval有时为18ms，有时为36ms，有时为54ms，每个connection interval发送的packet也不同，有时1包，有时2包，有时3、4包，这很不科学，connection interval应该是不受任何因素影响的，为什么示波器抓出来的波型显示是这个结果？

下面是部分代码：

1.
enum arch_main_loop_callback_ret user_app_on_ble_powered(void)
{
if(ptr_in != ptr_out) //if there is data left in the ring data buffer and then wake up the BLE to notify
{
return KEEP_POWERED;
}

return GOTO_SLEEP;
}
2.
enum arch_main_loop_callback_ret user_app_on_sytem_powered(void)
{
uint8_t tempdata[2];
int qrsdata_in;

if(adc_int_is_set) //adc sample is complete
{
ads1115_get_adc_result(tempdata);

DATA_FIFO[ptr_in][ADC_VALUE_SIZE * (1+cycle_num)] = tempdata[0]; //store adc sample result in the ring data buffer
DATA_FIFO[ptr_in][ADC_VALUE_SIZE * (1+cycle_num)+ 1 ] = tempdata[1]; //store adc sample result in the ring data buffer

cycle_num++;
if(cycle_num == CYCLE_NUM) //CYCLE_NUM = 5
{
DATA_FIFO[ptr_in][0] = (uint8_t)(counter/256); //high byte
DATA_FIFO[ptr_in][1] = (uint8_t)(counter%256); //low byte
if(counter == 0xFFFF)
{
counter = 0;
flag = true;
}
计数器+ +;
if(flag) {counter = 0; flag = false;}

cycle_num=0;

ptr_in++;
if(ptr_in >= PACKET_NUMBER) ptr_in = 0;

adc_int_is_set = false;
return KEEP_POWERED; //need to notify data
}
adc_int_is_set = false;
}
return GOTO_SLEEP; //no need to notify data
}
3.
static const struct arch_main_loop_callbacks user_app_main_loop_callbacks = {
.app_on_init = user_app_init,
.app_on_ble_powered = user_app_on_ble_powered,
.app_on_sytem_powered = user_app_on_sytem_powered,
.app_before_sleep = NULL,
.app_validate_sleep = NULL,
.app_going_to_sleep = NULL,
.app_resume_from_sleep = NULL,
};
4.数据发送函数，先检查TX_IS_COMPLETED标志
uint8_t data_send_process(void)
{
if(!TX_IS_COMPLETED) return 0; //the former notification is complete

data_to_notify(DATA_FIFO[ptr_out],PACKET_SIZE); //data transmitting

ptr_out++;

if(ptr_out >= PACKET_NUMBER) ptr_out = 0;

TX_IS_COMPLETED = false; //clear the TX_COMPLETE flag

return 0;
}
5.data_send_process()在BLE on的时候调用
static inline void schedule_while_ble_on(void)
{
// BLE clock is enabled
while (ble_is_powered()) {

// BLE event end is set. conditional RF calibration can run.
uint8_t ble_evt_end_set = ke_event_get(KE_EVENT_BLE_EVT_END);

//execute messages and events
rwip_schedule();

//
if (ble_evt_end_set)
{
uint32_t sleep_duration = 0;
rcx20_read_freq ();

/ /如果你有足够的时间跑calibr温度ation of the radio
if (lld_sleep_check(&sleep_duration, 4)) //6 slots -> 3.750 ms
// check time and temperature to run radio calibrations.
conditionally_run_radio_cals();
}

//grant control to the application, try to go to sleep
//if the applciation returns GOTO_SLEEP
if (!app_asynch_trm())
break;

//SDKIMPROVEMENTS Needs testing!! We can add the following condition and move
// it out of the loop
// we may consider putting it in before the app_asynch_trm
//if (GetBits16(CLK_CTRL_REG, RUNNING_AT_XTAL16M))

// execute the printf process
arch_printf_process();
data_send_process();
}
}
6.TX_IS_COMPLETED 置位，当上一包数据发送完毕的时候
void user_catch_rest_hndl(ke_msg_id_t const msgid,
void const *param,
ke_task_id_t const dest_id,
ke_task_id_t const src_id)
{
switch(msgid)
{

case CUSTS1_VAL_NTF_CFM:
{
struct custs1_val_ntf_cfm const *msg_param = (struct custs1_val_ntf_cfm const *)(param);

switch (msg_param->handle)
{
case ECG_IDX_DATA_VAL:

TX_IS_COMPLETED = true; //set if the former packet is transmitted completely

break;

default:
break;
}
} break;

default:
break;
}
}
环境：
SDK5.0.3
测试手机：iphone6及samsung s6

BR,

Young