Add Bluepill (stm32f103) handwired keyboard (#4126)

* Main folder

Main folder with some changes like the base layout and matrix for uploading in a future to the qmk repositorie

* First Commit

Firsts non previously commited changes:
-Changed to keyboards/handwired
-Basic credit to Xydane
-70% Layout

* Modified file structure for several keyboards

As I don't want to create several folders and overcrowd the main folders I made a few modifications to being able of configure several keyboards as revisions of the main keyboard.
Added a second variant.
Compiling tests went right but I haven't tried it on the controller.

* Starting leds

* Started dual color leds PWM functions and configs

I started to create the PWM functions and configs based on internet examples, it doesn't compile yet

* Backtraced a bit to establish and try debug before continuing the pwm

Just this, algo some doc as a new pinout image, space cadet modification to try if it works and little more

* Deleted unuseful stuff

After trying the reestructure to being compatible with several keyboards and that it worked I deleted the other keyboard.
Added space cadet shift to ISO.
Finally I couldn't debug everything and I'm getting quite frustrated to continue much more than just adding pwm leds

* Changed again Iso fix for Space Cadet

* Renamed keyboard, future pull

I just renamed the keyboard and made some simplifying changes in order to make a pull request sometime soon.

I'm too frustrated, tired and knowledge limited to achive using the PWM for leds, I didn't even get to use the debug mode...

I intend to end basic led color change using layers (if I can), document everything properly and make a pull request so other users can continue/use this project.

* Writed Readme.md file

I also corrected a previous compilation problem and ordered a bit the keymaps

* Corrected readme

* Try to add layer activated light

* Revert "Try to add layer activated light"

This reverts commit 205af820d845dab08988f329b9f062f558060220.

* Progress to fork

Coming back to work, upcoming pull

* Linked image

Corrected readme

* Some cleanning

Added images to readme, som cleaning, burning after commit.

* Almost finished (working)

Finally

* Finished bluepill firmware

Just finished and tried layer dependant led colors. Going for merge

* Deleted innecesary stuff and trailing spaces

Just as commit title said.

* Coding conventions

Just modified some files to respect coding conventions

* Deleted XXXXXX define

Checking some other PR seen this improvement

* Changes suggested on PR

Firs doing the easy changes

* More changes for the PR

-I also deleted one unused function for led toggling on matrix.c (Now it uses layer dependent baklight, algo on of on start)
-Deleted commented function on keymaps.

Right now only needs testing and all pragma replaces.

* Almost every pragma change on PR

That's almost finished, only waiting for reply due to compiling errors

* Revert "Almost every pragma change on PR"

This reverts commit 07f23aa862b370cdf0ae37d6f2130c9e9856f491.

* Revert last commit

I moddified by mistake a file from another keyboard

* Solved last pragma

Compiles fine.
Now I only need to test it, I say you if it works to include it in the main repository.

1 files changed, 60 insertions, 0 deletions

diff --git a/keyboards/handwired/bluepill/readme.md b/keyboards/handwired/bluepill/readme.md
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+++ b/keyboards/handwired/bluepill/readme.md
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+
+# BluePill handwired
+
+Keyboards using a BluePill controller (generic Chinese STM32F103C8T6) and based on the [KC64 of Xydane](https://github.com/Xydane/qmk_firmware).
+
+Keyboard Maintainer: [FPazos](https://github.com/fpazos), but I hope to leave the project in better hands.
+Hardware Supported: Bluepill STM32F103C8T6 
+Hardware Availability: Everywhere
+
+Make example for BluePill70 (after setting up your build environment):
+
+make handwired/bluepill/bluepill70:default
+
+See [build environment setup](https://docs.qmk.fm/#/getting_started_build_tools) then the [make instructions](https://docs.qmk.fm/#/getting_started_make_guide) for more information.
+
+Read everything before using it.
+
+## Introduction
+
+First of all thanks to [Xydane](https://github.com/Xydane) at [GeekHack](https://geekhack.org/) for his advice and his repository, without it you couldn't be reading this.
+
+That's was an attempt to create a firmware using an STM32F103C8T6, and in a "future", also developing a revision for split keyboards. But...
+As I'm mainly a web developer I didn't even get to debug the controller, not to speak about ChibiOS. So I just structured everything, created a working 70% layout and leave the project to someone with more knowledge and patience.
+
+## Resistor fix
+
+If you want to use the Bluepill USB port, it's very likely that you need to solder a 1.8 kΩ between PA12 and 3.3V. That depends on the PC's motherboard but I needed, more info [here](https://wiki.stm32duino.com/index.php?title=Blue_Pill).
+
+## No bootloader
+
+Neither Xydane or I used the bootloader, the code for it is commented and you can use it if you want. I didn't achieve to run it and just used a serial programmer (FTDI, ST-LINK).
+
+## Adding layouts and revisions
+
+If you want to create new layouts just add them to the keymaps folder. If you prefer to develop a more complex revision just copy the bluepill70 folder, rename it and create a new keymap in /keymap.c (I tried to divide the project even more but it didn't worked).
+
+## Pinout
+
+That's the pinout;
+
+        A5  A15   A10   A9  A8  B15  B14  B13   B12  B11  B10  B1   B0      A7      A6      
+    B9  ESC| F1 | F2 | F3 | F4 | F5 | F6 | F7 | F8 | F9 | F10| F11| F12| PSC| PGU| PGD
+    B8  GRA| 1  | 2  | 3  | 4  | 5  | 6  | 7  | 8  | 9  | 0  | '  | ¡  |   BCKS  | DEL
+    B7  TAB| Q  | W  | E  | R  | T  | Y  | U  | I  | O  | P  | `  | +  |         | HOM
+    B6  CAP| A  | S  | D  | F  | G  | H  | J  | K  | L  | Ñ  | ´  | Ç  |   ENTER | END
+    B5  LSI| <  | Z  | X  | C  | V  | B  | N  | M  | ,  | .  | -  |   RSHIF | UP | FNT
+    A4  LCT| WIN| ALT|               ESPACE             | ALG| FN | RCT| LEF| DOW| RIG
+
+And the wiring:
+ISO
+![Wiring](https://i.imgur.com/ZCaxVzs.jpg)
+ANSI
+![Wiring](https://i.imgur.com/dBUJCdD.jpg)
+
+It also uses: 
+PC13: Caps Lock led.
+
+Backlight dual color leds, my version is for common anode that's more common, for leds with common anode just replace the palSetPad with palClearPad and viceversa.
+PA1: Backlight color A.
+PA0: Backlight color B.
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