B4R Tutorial How to Implement STM32 into B4R

Erel said:

I've ordered it. I will test it when it arrives.

Click to expand...

Starchild said:

It would now be possible to include the altered "Pin::setMode" code into B4R distribution so no additional patch would be required.

Click to expand...

Starchild said:

I have changed the "How to Implement STM32" document.
Available from top post.

Note:
Improved B4R integration using the existing STM32 library define
_VARIANT_ARDUINO_STM32_
instead of my own define
USING_STM32

No need to add or remove a define from the B4R defines template when changing board types.

Wish:
It would now be possible to include the altered "Pin::setMode" code into B4R distribution so no additional patch would be required.

B4X:

    //*******************************************
    void Pin::setMode(Byte arduino_Mode) {
#ifdef _VARIANT_ARDUINO_STM32_
    WiringPinMode stm32_Mode;
    switch (arduino_Mode) {
        case INPUT:
        stm32_Mode = INPUT;
        break;
        case OUTPUT:
        stm32_Mode = OUTPUT;
        break;
        case INPUT_PULLUP:
        stm32_Mode = INPUT_PULLUP;
        break;
    }
    pinMode(PinNumber, stm32_Mode);
#else
    pinMode(PinNumber, arduino_Mode);
#endif
    if (arduino_Mode == INPUT_PULLUP)
        CurrentValue = true;
     }
     //******************************************

Click to expand...

whcir said:

Starchild


Would it be possible to do the same thing with the Serial class and LOG display in board.cpp so when switching between AVR and STM32 I don't have to edit this file every time.

#else
//DEFINE_HWSERIAL(Serial, 3);// Use HW Serial 2 as "Serial"
DEFINE_HWSERIAL(Serial, 2); // changed for B4R
//DEFINE_HWSERIAL(Serial1, 2);
DEFINE_HWSERIAL(Serial1, 3); // changed for B4R
DEFINE_HWSERIAL(Serial2, 1);
#endif

Click to expand...

whcir said:

Could someone wrap the files for the internal RTC for the STM32? Its looks pretty simple but I don't have the experience.

Thanks

Click to expand...

Starchild said:

I can see this stm32 implementation is going to be an on going challenge.

I have had a flick through the Arduino_STM32 libraries and I believe that the I2C implementation that has been used is a software emulation of I2C. It does not use the imbedded hardware I2C support of the STM32 chip. As such the rwire library of B4R is not supported. In fact I believe the software emulation of I2C is only for MASTER and not SLAVE mode as there is no provision for a callback.

I have investigated this further and I have had a go of wrapping the Wire class within the Arduino_STM32 library to create a STM32 compatible rwire library for B4R. It only supports MASTER mode. SCL=PB6 and SDA=PB7.

The big unknown is that I don't have any I2C devices to test. Hope it works.

You will need to unpack the ZIP file "stm32_rwire.zip" and copy the contents to your "Additional Libraries" folder. You should have already set this up under B4R menu Tools/Configuration-Paths. Then re-run B4R for this new library to be presented in the Library Manager.

Click to expand...

Starchild said:

I can see this stm32 implementation is going to be an on going challenge.

I have had a flick through the Arduino_STM32 libraries and I believe that the I2C implementation that has been used is a software emulation of I2C. It does not use the imbedded hardware I2C support of the STM32 chip. As such the rwire library of B4R is not supported. In fact I believe the software emulation of I2C is only for MASTER and not SLAVE mode as there is no provision for a callback.

I have investigated this further and I have had a go of wrapping the Wire class within the Arduino_STM32 library to create a STM32 compatible rwire library for B4R. It only supports MASTER mode. SCL=PB6 and SDA=PB7.

The big unknown is that I don't have any I2C devices to test. Hope it works.

You will need to unpack the ZIP file "stm32_rwire.zip" and copy the contents to your "Additional Libraries" folder. You should have already set this up under B4R menu Tools/Configuration-Paths. Then re-run B4R for this new library to be presented in the Library Manager.

Click to expand...

Byte STM32_WireMaster::WriteTo2(Byte Address, bool SendStop, ArrayByte* Data) {
        Wire.beginTransmission(Address);
        byte b = Data->length;
        Wire.write((Byte*)Data->data, Data->length);
    //    if (SendStop) {
    //        Wire.i2c_stop();
    //    }
    //    Wire.endTransmission();
        Wire.endTransmission(SendStop);
        return b;
}

derez said:

Using the stm32_rwire library I got error with STM32F103C8T6. I have modified Starchild's library (stm32_rWire.cpp) like this:

B4X:

Byte STM32_WireMaster::WriteTo2(Byte Address, bool SendStop, ArrayByte* Data) {
        Wire.beginTransmission(Address);
        byte b = Data->length;
        Wire.write((Byte*)Data->data, Data->length);
    //    if (SendStop) {
    //        Wire.i2c_stop();
    //    }
    //    Wire.endTransmission();
        Wire.endTransmission(SendStop);
        return b;
}

Now it works without errors and I have connected HMC5883L magnetometer successfuly (connecting SCL to PB6 and SDA to PB7), and MPU6050 IMU as well.
The programs are the same as this https://www.b4x.com/android/forum/t...nts-mpu-6050-and-magnetometer-hmc5883l.65917/

Click to expand...