JTAG error while trying to run Programmer Shield

Troubleshooting
1

When trying to run openocd with this command:

 openocd -f /Users/macbook/Documents/.../openocd-0.9.0/tcl/interface/ftdi/particle-ftdi.cfg -f /Users/{username}/Documents/.../openocd-0.9.0/tcl/target/stm32f2x.cfg -c "gdb_port 3333" -c "\$_TARGETNAME configure -rtos FreeRTOS"

I get the following error:

Open On-Chip Debugger 0.9.0 (2015-05-28-12:05)
Licensed under GNU GPL v2
For bug reports, read
	http://openocd.org/doc/doxygen/bugs.html
Info : auto-selecting first available session transport "jtag". To override use 'transport select <transport>'.
adapter speed: 1000 kHz
adapter_nsrst_delay: 100
jtag_ntrst_delay: 100
none separate
cortex_m reset_config sysresetreq
Info : clock speed 1000 kHz
Error: JTAG scan chain interrogation failed: all ones
Error: Check JTAG interface, timings, target power, etc.
Error: Trying to use configured scan chain anyway...
Error: stm32f2x.cpu: IR capture error; saw 0x0f not 0x01
Warn : Bypassing JTAG setup events due to errors
Warn : Invalid ACK 0x7 in JTAG-DP transaction
Warn : Invalid ACK 0x7 in JTAG-DP transaction
Warn : Invalid ACK 0x7 in JTAG-DP transaction
Warn : Invalid ACK 0x7 in JTAG-DP transaction
Warn : Invalid ACK 0x7 in JTAG-DP transaction
Warn : Invalid ACK 0x7 in JTAG-DP transaction
Warn : Invalid ACK 0x7 in JTAG-DP transaction
Warn : Invalid ACK 0x7 in JTAG-DP transaction
Warn : Invalid ACK 0x7 in JTAG-DP transaction
Warn : Invalid ACK 0x7 in JTAG-DP transaction

I have no idea what is going on or how to fix it. Any help appreciated. Thanks in advance!

2

Make sure you are not using the D3, D4, D5, D6, D7 pins in your code. Those pins are used for JTAG communication.

Also try to connect the debugger with the Photon in DFU mode (flashing yellow). In this mode, JTAG should be enabled.

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