NRF52840 Development
Open three terminals in the /opt/SEGGER/JLink_V622g directory.
1. start remote server
$ ./JLinkRemoteServer UseTunnel
2. start RTT client
$ ./JLinkRTTClien
3. start JLinkExe
connect NRF52840_XXAA <Enter> S
$ ./JLinkExe SEGGER J-Link Commander V6.22g (Compiled Jan 17 2018 16:40:37) DLL version V6.22g, compiled Jan 17 2018 16:40:32 Connecting to J-Link via USB...O.K. Firmware: J-Link OB-SAM3U128-V2-NordicSemi compiled Jan 12 2018 16:05:20 Hardware version: V1.00 S/N: 683525645 VTref = 3.300V Type "connect" to establish a target connection, '?' for help J-Link>connect Please specify device / core. <Default>: NRF52832_XXAA Type '?' for selection dialog Device>NRF52840_XXAA Please specify target interface: J) JTAG (Default) S) SWD TIF>S Specify target interface speed [kHz]. <Default>: 4000 kHz Speed> Device "NRF52840_XXAA" selected. Connecting to target via SWD Found SW-DP with ID 0x2BA01477 Found SW-DP with ID 0x2BA01477 Scanning AP map to find all available APs AP[2]: Stopped AP scan as end of AP map has been reached AP[0]: AHB-AP (IDR: 0x24770011) AP[1]: JTAG-AP (IDR: 0x02880000) Iterating through AP map to find AHB-AP to use AP[0]: Core found AP[0]: AHB-AP ROM base: 0xE00FF000 CPUID register: 0x410FC241. Implementer code: 0x41 (ARM) Found Cortex-M4 r0p1, Little endian. FPUnit: 6 code (BP) slots and 2 literal slots CoreSight components: ROMTbl[0] @ E00FF000 ROMTbl[0][0]: E000E000, CID: B105E00D, PID: 000BB00C SCS-M7 ROMTbl[0][1]: E0001000, CID: B105E00D, PID: 003BB002 DWT ROMTbl[0][2]: E0002000, CID: B105E00D, PID: 002BB003 FPB ROMTbl[0][3]: E0000000, CID: B105E00D, PID: 003BB001 ITM ROMTbl[0][4]: E0040000, CID: B105900D, PID: 000BB9A1 TPIU ROMTbl[0][5]: E0041000, CID: B105900D, PID: 000BB925 ETM Cortex-M4 identified. J-Link>
To compile, flash and reset:
~/Projects/nRF5_SDK_14.2.0_17b948a/examples/peripheral/spi/pca10056/blank/armgcc $ make $ nrfjprog -f NRF52 --program _build/nrf52840_xxaa.hex --sectorerase $ nrfjprog -f NRF52 --reset
