Add blue pill to promini extender

BluePillExtender/.gitignore

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+.pio
+.vscode/.browse.c_cpp.db*
+.vscode/c_cpp_properties.json
+.vscode/launch.json
+.vscode/ipch
+extensions.json

BluePillExtender/extra_script.py

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+Import("env")
+
+env.Append(
+    # Use the semihosted version of the syscalls
+    LINKFLAGS=[
+        "--specs=rdimon.specs"
+    ],
+    LIBS=[
+        "rdimon",
+    ],
+)

BluePillExtender/include/README

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+
+This directory is intended for project header files.
+
+A header file is a file containing C declarations and macro definitions
+to be shared between several project source files. You request the use of a
+header file in your project source file (C, C++, etc) located in `src` folder
+by including it, with the C preprocessing directive `#include'.
+
+```src/main.c
+
+#include "header.h"
+
+int main (void)
+{
+ ...
+}
+```
+
+Including a header file produces the same results as copying the header file
+into each source file that needs it. Such copying would be time-consuming
+and error-prone. With a header file, the related declarations appear
+in only one place. If they need to be changed, they can be changed in one
+place, and programs that include the header file will automatically use the
+new version when next recompiled. The header file eliminates the labor of
+finding and changing all the copies as well as the risk that a failure to
+find one copy will result in inconsistencies within a program.
+
+In C, the convention is to give header files names that end with `.h'.
+
+Read more about using header files in official GCC documentation:
+
+* Include Syntax
+* Include Operation
+* Once-Only Headers
+* Computed Includes
+
+https://gcc.gnu.org/onlinedocs/cpp/Header-Files.html

BluePillExtender/lib/README

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+
+This directory is intended for project specific (private) libraries.
+PlatformIO will compile them to static libraries and link into the executable file.
+
+The source code of each library should be placed in a separate directory
+("lib/your_library_name/[Code]").
+
+For example, see the structure of the following example libraries `Foo` and `Bar`:
+
+|--lib
+|  |
+|  |--Bar
+|  |  |--docs
+|  |  |--examples
+|  |  |--src
+|  |     |- Bar.c
+|  |     |- Bar.h
+|  |  |- library.json (optional. for custom build options, etc) https://docs.platformio.org/page/librarymanager/config.html
+|  |
+|  |--Foo
+|  |  |- Foo.c
+|  |  |- Foo.h
+|  |
+|  |- README --> THIS FILE
+|
+|- platformio.ini
+|--src
+   |- main.c
+
+Example contents of `src/main.c` using Foo and Bar:
+```
+#include <Foo.h>
+#include <Bar.h>
+
+int main (void)
+{
+  ...
+}
+
+```
+
+The PlatformIO Library Dependency Finder will find automatically dependent
+libraries by scanning project source files.
+
+More information about PlatformIO Library Dependency Finder
+- https://docs.platformio.org/page/librarymanager/ldf.html

BluePillExtender/platformio.ini

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+; PlatformIO Project Configuration File
+;
+;   Build options: build flags, source filter
+;   Upload options: custom upload port, speed and extra flags
+;   Library options: dependencies, extra library storages
+;   Advanced options: extra scripting
+;
+; Please visit documentation for the other options and examples
+; https://docs.platformio.org/page/projectconf.html
+
+[env:bluepill_f103c8]
+platform = ststm32
+board = bluepill_f103c8
+framework = arduino
+upload_protocol = stlink
+
+; Add The following lines of code to your project's platformio.ini file.
+upload_flags = -c set CPUTAPID 0            ; Allow Original and Clone STM32 to be detected by OpenOCD debugger.
+debug_build_flags = -O0 -ggdb3              ; Apply no optimization to the code written.
+;debug_init_break = tbreak Reset_Handler    ; Uncomment to activate: Adds a break point in the reset handler.
+
+
+; ============ Enable Arm Semihosting in debugger to show logs =============
+
+; Add The following code lines to enable semihosting feature.
+; To disable semihosting please comment all of the following code lines by adding semicolon ";" before each one:
+
+build_unflags =
+    --specs=nosys.specs 
+    -lnosys
+
+extra_scripts = extra_script.py              ; The "extra_script.py" file must be located in the main project folder
+
+debug_extra_cmds =
+    monitor arm semihosting enable
+    monitor arm semihosting_fileio enable
+
+test_testing_command =
+    ${platformio.packages_dir}/tool-openocd/bin/openocd
+    -s
+    ${platformio.packages_dir}/tool-openocd
+    -f
+    openocd/scripts/board/stlink.cfg
+    -c
+    init
+    -c
+    arm semihosting enable
+    -c
+    reset run
+
+; debug_tool = custom
+; debug_port = :3333
+; ===========================================================================

BluePillExtender/src/main.cpp

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+#include <Arduino.h>
+
+// This file is to be loaded onto an STM32F103C8 as a simple IO extender to the ESP module.
+// Communication between ESP and STM32 is using the I2C bus, so only two wires needed.
+// BluePill 
+// - I2C1: SDA – PB7 or PB9 | SCL – PB6 or PB8
+// - I2C2: SDA – PB11 | SCL – PB10. 
+// Configure it before upload it. 
+// ESP I2C can be configured but they are on GPIO-4 and GPIO-5 by default.
+
+#include <Wire.h>
+
+#define I2C_ADDRESS        0x7f
+#define I2C_INTERFACE      1
+
+#if I2C_INTERFACE == 1
+  #define I2C_SCL_PIN       PB6 // PB8  
+  #define I2C_SDA_PIN       PB7 // PB9
+#else
+  #define I2C_SCL_PIN       PB10
+  #define I2C_SDA_PIN       PB11
+#endif
+
+
+#define I2C_MSG_IN_SIZE    4
+#define I2C_MSG_OUT_SIZE   4
+
+#define CMD_DIGITAL_WRITE  1
+#define CMD_DIGITAL_READ   2
+#define CMD_ANALOG_WRITE   3
+#define CMD_ANALOG_READ    4
+// #define CMD_CONFIG_PIN     5
+// #define CFG_PIN_DIGITALIN  1
+// #define CFG_PIN_DIGITALOUT 2
+// #define CFG_PIN_ANALOGIN   3 
+
+// Tabela de mapeamento: Índice (Byte recebido) -> Pino Físico STM32
+// Você pode alterar a ordem ou os pinos conforme sua necessidade física.
+const uint32_t pinMap[] = {
+  // --- GROUP 1: PURE DIGITAL (GPIO) ---
+  // digitalRead() and digitalWrite() only.
+  // Most are 5V tolerant (FT).
+  PA8,  // ID 0
+  PA9,  // ID 1  (Default TX1)
+  PA10, // ID 2  (Default RX1)
+  PB5,  // ID 3
+  // PB6,  // ID 4  (I2C1 SCL / TIM4_CH1)
+  // PB7,  // ID 5  (I2C1 SDA / TIM4_CH2)
+  PB8,  // ID 6  (I2C1 SCL / TIM4_CH3 / CAN RX)
+  PB9,  // ID 7  (I2C1 SDA / TIM4_CH4 / CAN TX)
+  PB10, // ID 8  (I2C2 SCL / UART3 TX)
+  PB11, // ID 9  (I2C2 SDA / UART3 RX)
+  PB12, // ID 10  (SPI2 NSS)
+  PB13, // ID 11  (SPI2 SCK)
+  PB14, // ID 12  (SPI2 MISO)
+  PB15, // ID 13  (SPI2 MOSI)
+
+  // --- GROUP 2: SPECIAL PINS (Use with caution) ---
+  PA15, // ID 14  (JTAG - OK if JTAG is disabled/remapped)
+  PB3,  // ID 15  (JTAG - OK if JTAG is disabled/remapped)
+  PB4,  // ID 16  (JTAG - OK if JTAG is disabled/remapped)
+  PC13, // ID 17  (Onboard LED - Inverted Logic)
+  // PC14, // ID 18  (32k Oscillator - Use with caution)
+  // PC15,  // ID 19  (32k Oscillator - Use with caution)
+
+  // --- GROUP 3: ANALOG INPUTS (ADC1) ---
+  // These pins accept analogRead() as well as digitalRead()/digitalWrite()
+  PA0,  // ID 20
+  PA1,  // ID 21
+  PA2,  // ID 22
+  PA3,  // ID 23
+  PA4,  // ID 24
+  PA5,  // ID 25
+  PA6,  // ID 26
+  PA7,  // ID 27
+  PB0,  // ID 28
+  PB1,  // ID 29
+};
+
+volatile uint8_t sendBuffer[I2C_MSG_OUT_SIZE];
+
+void receiveEvent(int);
+void clearSendBuffer();
+void requestEvent();
+
+// Semihosting
+// extern "C" void initialise_monitor_handles(void);
+
+void setup()
+{
+  // Semihosting
+  // initialise_monitor_handles();   /* This Function MUST come before the first printf() */
+  for (int i = 0; i < 30; i++){
+    if (i >=20)
+      pinMode(pinMap[i], INPUT_ANALOG);
+    else
+      pinMode(pinMap[i], INPUT_PULLUP);
+  }
+
+  Wire.setSCL(I2C_SCL_PIN);
+  Wire.setSDA(I2C_SDA_PIN);
+  Wire.begin(I2C_ADDRESS);
+  Wire.onReceive(receiveEvent);
+  Wire.onRequest(requestEvent);
+}
+
+void loop() {}
+
+void receiveEvent(int count)
+{
+  if (count == I2C_MSG_IN_SIZE)
+  {
+    byte cmd = Wire.read();
+    byte portIndex = Wire.read();
+    int value = Wire.read();
+    value += Wire.read()*256; 
+
+    if (portIndex >= 29) return;
+    uint32_t port = pinMap[portIndex];
+
+    switch(cmd)
+      {
+
+        case CMD_DIGITAL_WRITE:
+          pinMode(port, OUTPUT);
+          digitalWrite(port,value);
+          break;
+
+        case CMD_DIGITAL_READ:
+          pinMode(port, INPUT_PULLUP);
+          clearSendBuffer();
+          sendBuffer[0] = digitalRead(port);
+          break;
+
+        case CMD_ANALOG_WRITE:
+          pinMode(port, OUTPUT);
+          analogWrite(port,value);
+          break;
+
+        case CMD_ANALOG_READ:
+          if (portIndex < 20) return;
+          clearSendBuffer();
+          int valueRead = analogRead(port);
+          sendBuffer[0] = valueRead & 0xff;
+          sendBuffer[1] = valueRead >> 8;
+          break;
+      }
+  }
+}
+
+void clearSendBuffer()
+{
+  for(byte x=0; x < sizeof(sendBuffer); x++)
+    sendBuffer[x]=0;
+}
+
+void requestEvent()
+{
+  Wire.write((const uint8_t*)sendBuffer,sizeof(sendBuffer));
+}

BluePillExtender/test/README

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+
+This directory is intended for PlatformIO Test Runner and project tests.
+
+Unit Testing is a software testing method by which individual units of
+source code, sets of one or more MCU program modules together with associated
+control data, usage procedures, and operating procedures, are tested to
+determine whether they are fit for use. Unit testing finds problems early
+in the development cycle.
+
+More information about PlatformIO Unit Testing:
+- https://docs.platformio.org/en/latest/advanced/unit-testing/index.html

README.md

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 # ESPEasySlaves
-Arduino (AVR/ATTiny) based slave projects for ESP Easy
+
+Arduino (AVR/ATTiny/STM32) based slave projects for ESP Easy
+
+## STM32 - Bluepill - STM32F103c8
+
+This firmware turns the Bluepill into an I/O extender via I2C.
+
+### I2C Configuration
+*   **Address:** `0x7f`
+*   **Pins:** SCL=`PB6`, SDA=`PB7`
+
+### Pin Mapping
+
+| Index | STM32 Pin | Type | Notes |
+| :---: | :--- | :--- | :--- |
+| 0 | PA8 | Digital | |
+| 1 | PA9 | Digital | |
+| 2 | PA10 | Digital | |
+| 3 | PB5 | Digital | |
+| 4 | PB8 | Digital | |
+| 5 | PB9 | Digital | |
+| 6 | PB10 | Digital | |
+| 7 | PB11 | Digital | |
+| 8 | PB12 | Digital | |
+| 9 | PB13 | Digital | |
+| 10 | PB14 | Digital | |
+| 11 | PB15 | Digital | |
+| 12 | PA15 | Digital | JTAG |
+| 13 | PB3 | Digital | JTAG |
+| 14 | PB4 | Digital | JTAG |
+| 15 | PC13 | Digital | LED Onboard |
+| 16 | PA0 | Digital | *Restricted to Digital (see note)* |
+| 17 | PA1 | Digital | *Restricted to Digital (see note)* |
+| 18 | PA2 | Digital | *Restricted to Digital (see note)* |
+| 19 | PA3 | Digital | *Restricted to Digital (see note)* |
+| 20 | PA4 | Analog/Digital | |
+| 21 | PA5 | Analog/Digital | |
+| 22 | PA6 | Analog/Digital | |
+| 23 | PA7 | Analog/Digital | |
+| 24 | PB0 | Analog/Digital | |
+| 25 | PB1 | Analog/Digital | |
+
+> **Note:** Due to the current firmware logic, the `CMD_ANALOG_READ` command is only processed for indices >= 20. Therefore, PA0-PA3 work only as Digital I/O in this mapping.