Feature: blackpill-f4 better control of pin mode #2044
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dragonmux
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Jan 7, 2025
dragonmux
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Enhancement
* Pulling up TRST is required to scan Raspberry Pi 3B (BCM2837) and other JTAG targets * jtagtap.c will gpio_clear() it if available
* Prevent drive fight with G030J6 * Allow multiple debuggers on same target without detaching this one * Directional buffers will need an extra pin
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dragonmux
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Jan 8, 2025
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Detailed description
platform_target_clk_output_enable()which switches SWCLK/SWDIO to inputs or outputs.This should allow keeping multiple BMPs wired up to a single target for cross-testing etc. and should prevent drive fight with low pin count chips like STM32G030J6 (I don't have one) or which remap their PA13/14 to output mode otherwise. No known shields/carriers/mainboards exist for it which have directional buffers and TCK_OEn aka TCK_DIR_PIN -- it would need similar treatment.
TRST pin high is required to even scan Raspberry Pi 3B (BCM2837), otherwise its TAP is disabled (default weak pull-down).
Pending testing on
blackpill-f411ce.Your checklist for this pull request
Closing issues
Fixes #1868 point 3 for this board.