Unable to Connect to BlueNRG-332AC via SWD
Hi ,
I'm currently working with a BlueNRG-332AC and am unable to establish an SWD connection for programming/debugging.
Hardware Checks
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Verified the SWD header continuity – all connections are OK.
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Tried swapping SWDIO and SWCLK to rule out wiring issues, but it made no difference.
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The target board is powered.
Voltage Measurements on SWD Header
| Pin | Measured Voltage |
|---|---|
| Pin 1 (VCC) | 3.3 V |
| Pin 2 | 3.3 V |
| Pin 3 (SWDIO) | 3.3 V |
| Pin 4 (SWCLK) | 0 V |
| GND | 0 v |
Software Tried
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BlueNRG ST-Link Utility
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RF Flasher Utility
BlueNRG ST-Link Utility Log
18:29:21 : Can not connect to target!
If you're trying to connect to a low frequency application, please select a lower SWD Frequency mode from Target->Settings menu.
18:29:22 : No target connected
18:29:32 : Can not connect to target!
Please select "Connect with Pre-Reset" mode from Target->Settings menu and try again.
If you're trying to connect to a low frequency application, please select a lower SWD Frequency mode from Target->Settings menu.
18:29:33 : No target connected
RF Flasher Log
****** FLASH READ OPERATION ******
Read of n.1 device connected by SWD (ST-Link, CMSIS-DAP, J-Link)
18:30:09.263: Waiting device to read (device connected by ST-Link) -> FAILED.
(It's not possible to connect to the device)
What I've Already Tried
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Verified SWD wiring and continuity.
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Checked target power supply.
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Swapped SWDIO and SWCLK connections.
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Tried connecting using both Normal and Connect Under Reset (Pre-Reset) modes.
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Reduced the SWD frequency.
Has anyone encountered a similar issue with the BlueNRG-332AC? Is there anything else I should verify, such as boot configuration, reset circuitry, SWD pin configuration, or device security state?
NOTE: Since i have only swd header to connect since UART connection also not possible
Any suggestions would be greatly appreciated. Thanks!
