Flash Firmware using c/JTAG
Please Note: . If you have accidentally disabled BSL on your stick by flashing it with an incompatible firmware, or if you are a firmware developer needing proper debugging facilities and/or want to get access to the RF tools in TI SmartRF Studio, follow along.
cJTAG vs JTAG
TI's newer generation chips use cJTAG as the default debug interface. While it may look like it (reduced pin count on the debug header), cJTAG is not SWD. cJTAG (IEEE 1149.7) is an extension to the JTAG standard (IEEE 1149.1), that reduces the number of required pins by multiplexing the TMS, TDI and TDO signals on a single bi-directional pin, providing all the normal JTAG debug and test functionality (ref).
The debug header on zzh only exposes TMS/TCK and as such a cJTAG compatible debug adapter is needed. On zzhp and zzhp-lite (Rev B3 onwards), all pins are brought out to the debug header so you can use a JTAG compatible debug adapter.
Flashing using CC-DEVPACK-DEBUG (or TI XDS110)
The cheapest option for an officially supported debugger is the CC-DEVPACK-DEBUG, available from most common electronics distributors. Here'a handy pinout reference for CC-DEVPACK-DEBUG:
Due to space constraints, the debug header on zzh is (sadly) non-standard:
To convert the zzh 5-pin debug header to a standard 10-pin Cortex Debug Connector, a small adapter PCB is needed (unless you hack and solder an IDC cable to the board directly). Design files for this adapter can be found in the repo.
With this adapter board plugged in to zzh, you can connect any debugger you wish to get access to the c/JTAG port. This little adapter board kit (some soldering required) is available as an optional add-on to zzh on Electrolama Tindie Store.
(The Debug Sandwich: CC-DEVPACK-DEBUG on top of the zzh-debug-adapter on top of zzh.)
zzhp and zzhp-lite do not require this adapter as there is enough space on the board for the standard 10-pin c/JTAG header.
Flashing using J-Link
Make sure power is provided to your stick (i.e: plug it in) and use "J-Link Commander" to erase and flash your stick:
J-Link>connect ? Please specify device / core. <Default>: ARM7 Type '?' for selection dialog Device>? Please specify target interface: J) JTAG (Default) S) SWD T) cJTAG TIF>T Device position in JTAG chain (IRPre,DRPre) <Default>: -1,-1 => Auto-detect JTAGConf> Specify target interface speed [kHz]. <Default>: 4000 kHz Speed> Device "CC2652R1F" selected. Connecting to target via cJTAG InitTarget: Found ICE-Pick with ID: 0x3BB4102F InitTarget: Found CPU TAP 0x4BA00477 DPv0 detected Scanning AP map to find all available APs AP: Stopped AP scan as end of AP map has been reached AP: AHB-AP (IDR: 0x24770011) Iterating through AP map to find AHB-AP to use AP: Core found AP: 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 @ E00FF000 ROMTbl: E000E000, CID: B105E00D, PID: 000BB00C SCS-M7 ROMTbl: E0001000, CID: B105E00D, PID: 003BB002 DWT ROMTbl: E0002000, CID: B105E00D, PID: 002BB003 FPB ROMTbl: E0000000, CID: B105E00D, PID: 003BB001 ITM ROMTbl: E0040000, CID: B105900D, PID: 000BB9A1 TPIU Cortex-M4 identified. J-Link>erase Without any give address range, Erase Chip will be executed Erasing device... J-Link: Flash download: Total time needed: 0.505s (Prepare: 0.072s, Compare: 0.000s, Erase: 0.415s, Program: 0.000s, Verify: 0.000s, Restore: 0.017s) Erasing done. J-Link>loadfile D:\blink.bin No address passed for .bin file. Assuming address: 0x0 Downloading file [D:\blink.bin]... J-Link: Flash download: Bank 0 @ 0x00000000: 2 ranges affected (40960 bytes) J-Link: Flash download: Total: 0.903s (Prepare: 0.166s, Compare: 0.145s, Erase: 0.021s, Program & Verify: 0.449s, Restore: 0.119s) J-Link: Flash download: Program & Verify speed: 89 KB/s O.K.
Error: "Selected interface (cJTAG) is not supported by the connected probe."
It appears that some J-Link pods do not support cJTAG and this error message is displayed when performing the steps above. If this is the case, select JTAG as the target interface:
J-Link>connect ? Please specify device / core. <Default>: ARM7 Type '?' for selection dialog Device>? Please specify target interface: J) JTAG (Default) S) SWD T) cJTAG TIF>J ...
This won't work on zzh, as the extra pins needed for full JTAG are not brought out on the 5-pin debug header.