https://devzone.nordicsemi.com/f/nordic-q-a/48590/i-want-to-control-the-timing-of-writing-to-the-sd-card-by-ble-communicationHello I currently use SDK 15.0.0 and write a program in SES. and use nrf52832(BLENano2). I&#39;m trying to merge BLE and fatfs examples. After writing to the SD card in the main function, if you start advertising BLE, it works without any problems.en-USTelligent Community 13Mon, 17 Jun 2019 08:02:01 GMThttps://devzone.nordicsemi.com/thread/193081?ContentTypeID=1Mon, 17 Jun 2019 08:02:01 GMT137ad170-7792-4731-bb38-c0d22fbe4515:6ec32bdc-0b74-43ea-8a50-44489ac88e78y001<p><span style="background-attachment:scroll;background-color:transparent;background-image:none;background-repeat:repeat;background-size:auto;color:rgba(0, 0, 0, 0.87);font-style:normal;font-weight:400;letter-spacing:normal;text-align:left;text-decoration:none;text-indent:0px;text-transform:none;white-space:pre-wrap;" title="">Set flag = true when 0x01 is received, and in the main function</span></p> <p></p> <p><br style="background-attachment:scroll;background-color:transparent;background-image:none;background-repeat:repeat;background-size:auto;color:rgba(0, 0, 0, 0.87);font-style:normal;font-weight:400;letter-spacing:normal;text-align:left;text-decoration:none;text-indent:0px;text-transform:none;white-space:pre-wrap;" /><span style="background-attachment:scroll;background-color:transparent;background-image:none;background-repeat:repeat;background-size:auto;color:rgba(0, 0, 0, 0.87);font-style:normal;font-weight:400;letter-spacing:normal;text-align:left;text-decoration:none;text-indent:0px;text-transform:none;white-space:pre-wrap;" title="">if (flag == true)</span><br style="background-attachment:scroll;background-color:transparent;background-image:none;background-repeat:repeat;background-size:auto;color:rgba(0, 0, 0, 0.87);font-style:normal;font-weight:400;letter-spacing:normal;text-align:left;text-decoration:none;text-indent:0px;text-transform:none;white-space:pre-wrap;" /><span style="background-attachment:scroll;background-color:transparent;background-image:none;background-repeat:repeat;background-size:auto;color:rgba(0, 0, 0, 0.87);font-style:normal;font-weight:400;letter-spacing:normal;text-align:left;text-decoration:none;text-indent:0px;text-transform:none;white-space:pre-wrap;" title="">{</span><br style="background-attachment:scroll;background-color:transparent;background-image:none;background-repeat:repeat;background-size:auto;color:rgba(0, 0, 0, 0.87);font-style:normal;font-weight:400;letter-spacing:normal;text-align:left;text-decoration:none;text-indent:0px;text-transform:none;white-space:pre-wrap;" /><span style="background-attachment:scroll;background-color:transparent;background-image:none;background-repeat:repeat;background-size:auto;color:rgba(0, 0, 0, 0.87);font-style:normal;font-weight:400;letter-spacing:normal;text-align:left;text-decoration:none;text-indent:0px;text-transform:none;white-space:pre-wrap;" title=""> If (flag2 == true) {</span><br style="background-attachment:scroll;background-color:transparent;background-image:none;background-repeat:repeat;background-size:auto;color:rgba(0, 0, 0, 0.87);font-style:normal;font-weight:400;letter-spacing:normal;text-align:left;text-decoration:none;text-indent:0px;text-transform:none;white-space:pre-wrap;" /><span style="background-attachment:scroll;background-color:transparent;background-image:none;background-repeat:repeat;background-size:auto;color:rgba(0, 0, 0, 0.87);font-style:normal;font-weight:400;letter-spacing:normal;text-align:left;text-decoration:none;text-indent:0px;text-transform:none;white-space:pre-wrap;" title=""> flag2 = false;</span><br style="background-attachment:scroll;background-color:transparent;background-image:none;background-repeat:repeat;background-size:auto;color:rgba(0, 0, 0, 0.87);font-style:normal;font-weight:400;letter-spacing:normal;text-align:left;text-decoration:none;text-indent:0px;text-transform:none;white-space:pre-wrap;" /><span style="background-attachment:scroll;background-color:transparent;background-image:none;background-repeat:repeat;background-size:auto;color:rgba(0, 0, 0, 0.87);font-style:normal;font-weight:400;letter-spacing:normal;text-align:left;text-decoration:none;text-indent:0px;text-transform:none;white-space:pre-wrap;" title=""> // SD card initialization process</span><br style="background-attachment:scroll;background-color:transparent;background-image:none;background-repeat:repeat;background-size:auto;color:rgba(0, 0, 0, 0.87);font-style:normal;font-weight:400;letter-spacing:normal;text-align:left;text-decoration:none;text-indent:0px;text-transform:none;white-space:pre-wrap;" /><span style="background-color:transparent;color:rgba(0, 0, 0, 0.87);float:none;font-family:&#39;Roboto&#39;,arial,sans-serif;font-size:18px;font-style:normal;font-weight:400;letter-spacing:normal;line-height:28px;text-align:left;text-decoration:none;text-indent:0px;text-transform:none;white-space:pre-wrap;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="background-color:transparent;color:rgba(0, 0, 0, 0.87);float:none;font-family:&#39;Roboto&#39;,arial,sans-serif;font-size:18px;font-style:normal;font-weight:400;letter-spacing:normal;line-height:28px;text-align:left;text-decoration:none;text-indent:0px;text-transform:none;white-space:pre-wrap;"> </span><span style="background-attachment:scroll;background-color:transparent;background-image:none;background-repeat:repeat;background-size:auto;color:rgba(0, 0, 0, 0.87);font-style:normal;font-weight:400;letter-spacing:normal;text-align:left;text-decoration:none;text-indent:0px;text-transform:none;white-space:pre-wrap;" title="">}</span><br style="background-attachment:scroll;background-color:transparent;background-image:none;background-repeat:repeat;background-size:auto;color:rgba(0, 0, 0, 0.87);font-style:normal;font-weight:400;letter-spacing:normal;text-align:left;text-decoration:none;text-indent:0px;text-transform:none;white-space:pre-wrap;" /><span style="background-color:transparent;color:rgba(0, 0, 0, 0.87);float:none;font-family:&#39;Roboto&#39;,arial,sans-serif;font-size:18px;font-style:normal;font-weight:400;letter-spacing:normal;line-height:28px;text-align:left;text-decoration:none;text-indent:0px;text-transform:none;white-space:pre-wrap;">&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="background-color:transparent;color:rgba(0, 0, 0, 0.87);float:none;font-family:&#39;Roboto&#39;,arial,sans-serif;font-size:18px;font-style:normal;font-weight:400;letter-spacing:normal;line-height:28px;text-align:left;text-decoration:none;text-indent:0px;text-transform:none;white-space:pre-wrap;"> </span><span style="background-attachment:scroll;background-color:transparent;background-image:none;background-repeat:repeat;background-size:auto;color:rgba(0, 0, 0, 0.87);font-style:normal;font-weight:400;letter-spacing:normal;text-align:left;text-decoration:none;text-indent:0px;text-transform:none;white-space:pre-wrap;" title="">// SD card processing</span><br style="background-attachment:scroll;background-color:transparent;background-image:none;background-repeat:repeat;background-size:auto;color:rgba(0, 0, 0, 0.87);font-style:normal;font-weight:400;letter-spacing:normal;text-align:left;text-decoration:none;text-indent:0px;text-transform:none;white-space:pre-wrap;" /><span style="background-attachment:scroll;background-color:transparent;background-image:none;background-repeat:repeat;background-size:auto;color:rgba(0, 0, 0, 0.87);font-style:normal;font-weight:400;letter-spacing:normal;text-align:left;text-decoration:none;text-indent:0px;text-transform:none;white-space:pre-wrap;" title="">}</span></p> <p></p> <p><br style="background-attachment:scroll;background-color:transparent;background-image:none;background-repeat:repeat;background-size:auto;color:rgba(0, 0, 0, 0.87);font-style:normal;font-weight:400;letter-spacing:normal;text-align:left;text-decoration:none;text-indent:0px;text-transform:none;white-space:pre-wrap;" /><span style="background-attachment:scroll;background-color:transparent;background-image:none;background-repeat:repeat;background-size:auto;color:rgba(0, 0, 0, 0.87);font-style:normal;font-weight:400;letter-spacing:normal;text-align:left;text-decoration:none;text-indent:0px;text-transform:none;white-space:pre-wrap;" title="">It was solved by making and.</span></p><div style="clear:both;"></div>