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997a6747ee
arm-dac-work
audio_out
b6_b7_audio
better_chibios_wait
changelog
clockworkpi
develop
edez2
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encoder_matrix
fix/get_report
fix/just_return_false
fix_template_bootmagic
gb_port
gc_switch
gh-pages
hailey_branch
json_audio
json_custom_keycodes
keyboard_overrides
keymap_folders
kle2json_hyper
led_matrix_direct
list_maintainers
make_cli_parsing
master
muon_light
muon_light_dc
olkb_vendor_folder
peasy
peb
pjrc_hid
planck-ez-a5-high
planck_ez_wdg
planck_ez_with_5372
planck_light_rev2
planck_thk
pre-develop-merge-nov20
python_optimizations
qmk_compile_build_keyboard
qmk_compile_improvements
qwiic_hub
qwiic_hud
qwiic_joystiic
refactor_process_record_kb_user
rgb7seg
subatomic
subatomic_encoders
subvendor_ids
titmlb
unorthodox
xap
xmega_support
zvecr-patch-1
0.10.0
0.10.1
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0.6.0
0.6.1
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0.6.20
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0.6.3
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0.7.0
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0.7.19
0.7.2
0.7.20
0.7.21
0.7.22
0.7.23
0.7.24
0.7.25
0.7.26
0.7.27
0.7.28
0.7.29
0.7.3
0.7.30
0.7.31
0.7.32
0.7.33
0.7.34
0.7.35
0.7.36
0.7.37
0.7.38
0.7.39
0.7.4
0.7.40
0.7.41
0.7.42
0.7.43
0.7.44
0.7.45
0.7.46
0.7.47
0.7.48
0.7.49
0.7.5
0.7.50
0.7.51
0.7.52
0.7.53
0.7.54
0.7.55
0.7.56
0.7.57
0.7.58
0.7.59
0.7.6
0.7.60
0.7.61
0.7.62
0.7.63
0.7.64
0.7.65
0.7.66
0.7.67
0.7.68
0.7.69
0.7.7
0.7.70
0.7.71
0.7.72
0.7.73
0.7.74
0.7.75
0.7.76
0.7.77
0.7.78
0.7.79
0.7.8
0.7.80
0.7.81
0.7.82
0.7.83
0.7.84
0.7.85
0.7.86
0.7.87
0.7.88
0.7.89
0.7.9
0.7.90
0.7.91
0.7.92
0.7.93
0.7.94
0.7.95
0.7.96
0.7.97
0.7.98
0.7.99
0.8.0
0.8.1
0.8.10
0.8.100
0.8.101
0.8.102
0.8.103
0.8.104
0.8.105
0.8.106
0.8.107
0.8.108
0.8.109
0.8.11
0.8.110
0.8.111
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0.8.114
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0.8.12
0.8.120
0.8.121
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0.8.13
0.8.130
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0.8.136
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0.8.14
0.8.140
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0.8.15
0.8.150
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0.8.154
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0.8.159
0.8.16
0.8.160
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0.8.165
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0.8.168
0.8.169
0.8.17
0.8.170
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0.8.174
0.8.175
0.8.176
0.8.177
0.8.178
0.8.179
0.8.18
0.8.180
0.8.181
0.8.182
0.8.183
0.8.184
0.8.185
0.8.186
0.8.187
0.8.188
0.8.189
0.8.19
0.8.190
0.8.191
0.8.192
0.8.2
0.8.20
0.8.21
0.8.22
0.8.23
0.8.24
0.8.25
0.8.26
0.8.27
0.8.28
0.8.29
0.8.3
0.8.30
0.8.31
0.8.32
0.8.33
0.8.34
0.8.35
0.8.36
0.8.37
0.8.38
0.8.39
0.8.4
0.8.40
0.8.41
0.8.42
0.8.43
0.8.44
0.8.45
0.8.46
0.8.47
0.8.48
0.8.49
0.8.5
0.8.50
0.8.51
0.8.52
0.8.53
0.8.54
0.8.55
0.8.56
0.8.57
0.8.58
0.8.59
0.8.6
0.8.60
0.8.61
0.8.62
0.8.63
0.8.64
0.8.65
0.8.66
0.8.67
0.8.68
0.8.69
0.8.7
0.8.70
0.8.71
0.8.72
0.8.73
0.8.74
0.8.75
0.8.76
0.8.77
0.8.78
0.8.79
0.8.8
0.8.80
0.8.81
0.8.82
0.8.83
0.8.84
0.8.85
0.8.86
0.8.87
0.8.88
0.8.89
0.8.9
0.8.90
0.8.91
0.8.92
0.8.93
0.8.94
0.8.95
0.8.96
0.8.97
0.8.98
0.8.99
0.9.0
0.9.1
0.9.10
0.9.11
0.9.12
0.9.13
0.9.14
0.9.15
0.9.16
0.9.17
0.9.18
0.9.19
0.9.2
0.9.20
0.9.21
0.9.22
0.9.23
0.9.24
0.9.25
0.9.26
0.9.27
0.9.28
0.9.29
0.9.3
0.9.30
0.9.31
0.9.32
0.9.33
0.9.34
0.9.35
0.9.36
0.9.37
0.9.38
0.9.39
0.9.4
0.9.40
0.9.41
0.9.42
0.9.43
0.9.44
0.9.45
0.9.46
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0.9.48
0.9.49
0.9.5
0.9.50
0.9.51
0.9.52
0.9.53
0.9.54
0.9.55
0.9.56
0.9.57
0.9.58
0.9.59
0.9.6
0.9.7
0.9.8
0.9.9
LUFA-111009
LUFA-130901
LUFA-130901-BETA
LUFA-140302
LUFA-140928
LUFA-151115
LUFA-170418
breakpoint_2019_08_30
breakpoint_2019_11_30
breakpoint_2020_02_29
breakpoint_2021_05_29
breakpoint_2021_08_28
breakpoint_2021_11_27
breakpoint_2022_05_28
drop-1.0.0
ergodox_ez-161205
gh60-0.1
planck-4.0
planck-4.1
planck-4.2
planck-5.0
planck-6.0
planck-6.1
planck-light-1.0
preonic-1.0
preonic-2.0
v4.0
${ noResults }
49 lines
3.6 KiB
49 lines
3.6 KiB
# WeAct Blackpill (STM32F4x1)
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This document applies to the F401- and F411-based Blackpills.
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The WeAct Blackpill is a popular choice for handwired boards, as it offers a powerful micro controller, USB Type C, a good number of pins to use, and a large amount of firmware space. All for a ~$6 USD price tag.
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* [WeAct GitHub for F4x1 Blackpill](https://github.com/WeActStudio/WeActStudio.MiniSTM32F4x1)
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* Unfortunately, due to supply issues official WeAct F411 based blackpills may not be available.
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## Pin Usage Limitations
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While the Blackpill is a great choice to use in your keyboard, there are a number of caveats in regards to using them. The first is that a number of exposed pins cannot be used, or have special considerations/hardware tweaks that are required for proper operation.
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### Unusable pins
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* Pins `A11` and `A12` are not usable because they're used for USB connection, and cannot be shared.
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* In theory, these pins can be used. However, doing so may disable USB connectivity, outright, if used for anything other than a USB port
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* Pin `B2` is used by `BOOT1` and cannot be used, without causing problems.
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* `VBAT` is not a usable pin.
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* `NRST` is not a usable pin.
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### Pins to be avoided
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* Pin `A9` is meant for VBUS Sense and should not be used, if it can be avoided. It has an internal pull-down resistor, which may cause issues with usage. However, a pull-up resistor can work (~5.1k), but should be avoided.
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* Pin `A10` can be used, but should be avoided. Any connection on this pin can prevent the bootloader from entering the proper mode for DFU flashing. A pull-up resistor (~22k) on this pin fixes the bootloader issue.
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### Shared Usage
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* Pin `A0` is shared with the User Key (button) on the controller. It can be used.
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* Pin `C13` is shared with the onboard LED indicator, and is connected to +3.3V. This can be used, but may cause the LED to blink intermittently, depending on activity on the pin.
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* Pins `A4`, `A5`, `A6` and `A7` are used by the SOI8 footprint on the back of the controller, that can be used for either an SPI Flash chip, or an SPI EEPROM chip. `A4` is the Chip Select pin, and cannot be shared. However, `A5`, `A6`, and `A7` are the `SCK`, `MISO`, and `MOSI` pins, respectively, and can be shared with other SPI devices.
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### Limited Usage
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* Pins `C13`, `C14`, and `C15` have limits on output current. They should be used only as input, e.g., they should not be used for row pins in COL2ROW matrix configurations, but can be used as column pins.
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* This is because the column pins (in COL2ROW) are pulled up (the pull-up strength is independent of the current sourcing limitation) and the ROW is driven low and sinks current, then we check the state of the COLs to look for keypresses.
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* Pins `A0` and `B5` are not 5V tolerant, and should only be used with 3.3V compatible functionality.
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## Additional Information
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### Bootloader issues
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Due to the use of a 25MHz crystal, the controller may have issues entering the bootloader. Heating up the controller can help with this issue.
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Also, if pin `A10` is connected to anything at all, it needs to have a pull-up resistor (see [Pins to be avoided](#pins-to-be-avoided), above)
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### Tiny UF2 Support
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There is [tinyuf2 support for the WeAct Blackpill](https://github.com/adafruit/tinyuf2/tree/master/ports/stm32f4/boards/stm32f411ce_blackpill). Instructions on how to compile the bootloader can be found [here](https://github.com/adafruit/tinyuf2#build-and-flash). Setting `BOOTLOADER = tinyuf2` will enable support for this user bootloader, and the correct configuration to prevent it from being overwritten when flashing firmware.
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