nRF51822

Question

Hi everybody, i am working with a nrf51822 chip and i would like to use it only in slave mode. is it possible? and how can we do it?
Thanks

Lukas_Simma · Accepted Answer

Hello, 
 with slave mode do you meen that the nrf51822 is the sensor and eg. a smartphone connect to the sensor to read/write some data? For that use case the S110 softdevice and the sample code are ready to go. 
 Hint: If you are in test stage only then from LAIRD you get a certified Module with Basic Scripts.... 
 
 
 At first to have an easy startup use a developent kit from NORDIC 
 
 
 The development kit contains the needed jtag debugger device to program and debug the chip 
 
 
 With the product code on the package on the website download the SDK 
 
 
 Download the free version from Keil uVision4 
 
 
 Install Nordic SDK (after installing Keil) 
 
 
 Use nRFgo Studio to flash the S110 Library to the chip 
 
 
 Open with KEIL the sample code from eg. ble\ble_app_hrs 
 
 
 Compile and flash the code with KEIL to the Chip 
 
 
 Download the Nordic App nRF Utility for iPhone or Samsung Galagy S3/S4 (and some else) 
 
 
 Connect from the App to the nordic chip 
 
 
 Now in the code check mail.c and ble__bas.c 
 
 
 in main.c see at
"advertising_init()" this prepare structures to do advertising
"advertising_start()" here the advertising ist started 
 
 
 the file ble_bas.c initializes a BTLE Battery service and the characteristic
check ble_bas_init() here the BTLE service is prepared
check battery_level_char_add() here the BTLE characteristics for the service is prepared
check ble_bas_battery_level_update() here a new value of the characteristic is set (and send with notify) 
 
 
 If you need to write a value from the smartphone to the chip check the code ble\ble_app_hids_mouse where many characteristics are enabled to change the value 
 
 
 Check the File "ble_hids.c" .... service and the characteristics form the HID service¨ 
 
 
 Check code lines where you find a write in it
char_md.char_props.read = 1;
char_md.char_props.write_wo_resp = 1;
char_md.char_props.write = 1;
--> For every characteristic which must be write enabled you have to define that it can be written (with or without a respons back to the smartphone after write operation) 
 
 
 See the lines
attr_md.read_perm = p_rep_ref_attr_md->read_perm;
attr_md.write_perm = p_rep_ref_attr_md->write_perm; 
 
 
 ---> You must also enable the right to write!!!
eg. use following for your first tests:
BLE_GAP_CONN_SEC_MODE_SET_OPEN(&attr_md.read_perm);
BLE_GAP_CONN_SEC_MODE_SET_OPEN(&attr_md.write_perm); 
 Best regards,
Lukas

nRF51822

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