JTAG

[marmeladapk]

JTAG mode does not work with stlink. Check if swapping TDI with TDO works.

[marmeladapk]

Switching TDO with TDI did not help. Logs:

TDI and TDO not swapped, first try after power cycle:

probe-rs run --protocol jtag --chip STM32H743ZITx --speed 300 target/thumbv7em-none-eabihf/debug/dual-iir
 WARN probe_rs::probe::jlink: More than one TAP detected, defaulting to tap0
ERROR probe_rs::probe::arm_debug_interface: Unexpected DAP response: 7
ERROR probe_rs::probe::arm_debug_interface: Unexpected DAP response: 7
ERROR probe_rs::probe::arm_debug_interface: Unexpected DAP response: 7
(...)
WARN probe_rs::session: Could not clear all hardware breakpoints: An ARM specific error occurred.

Caused by:
    0: Error using access port
    1: Failed to write register CSW at address 0x00000000
    2: An error occurred in the communication with an access port or debug port.
    3: Target device did not respond to request.                                                                     
ERROR probe_rs::probe::arm_debug_interface: Unexpected DAP response: 7                                               
ERROR probe_rs::probe::arm_debug_interface: Unexpected DAP response: 7
(...)                                               
WARN probe_rs::session: Failed to deconfigure device during shutdown: An ARM specific error occurred.

Caused by:
    0: Error using access port
    1: Failed to write register CSW at address 0x00000000
    2: An error occurred in the communication with an access port or debug port.
    3: Target device did not respond to request.                                                                     Error: The flashing procedure failed for 'target/thumbv7em-none-eabihf/debug/dual-iir'.

Caused by:
    0: Something during the interaction with the core went wrong
    1: An ARM specific error occurred.
    2: Error using access port
    3: Failed to write register DRW at address 0x0000000c
    4: An error occurred in the communication with an access port or debug port.
    5: Target device did not respond to request.

Subsequent tries:

probe-rs run --protocol jtag --chip STM32H743ZITx --speed 300 target/thumbv7em-none-eabihf/debug/dual-iir
Error: Connecting to the chip was unsuccessful.

Caused by:
    0: An error with the usage of the probe occurred
    1: Invalid data length

TDO swapped with TDI, all tries:

probe-rs run --protocol jtag --chip STM32H743ZITx --speed 300 target/thumbv7em-none-eabihf/debug/dual-iir
Error: Connecting to the chip was unsuccessful.

Caused by:
    0: An error with the usage of the probe occurred
    1: Invalid data length

--connect-under-reset did not help either.

[marmeladapk]

SWD works either way, so this is not a high priority.

[marmeladapk]

I checked all JTAG signal with an oscilloscope and there's simply nothing on TDO.