Compiler error: 'HardWire' does not name a type

[kozuch]

Hi there, the project will not compile for me. I get following error on STM32F103C8T6 (blue pill):

Arduino: 1.8.5 (Windows 7), Vývojová deska: "Generic STM32F103C series, STM32F103C8 (20k RAM. 64k Flash), Serial, 72Mhz (Normal), Smallest (default)"

C:\Users\Jack\Documents\Arduino\libraries\LiveOV7670_STM32\CameraOV7670Registers.cpp:9:1: error: 'HardWire' does not name a type

 HardWire mWire(2);

 ^

C:\Users\Jack\Documents\Arduino\libraries\LiveOV7670_STM32\CameraOV7670Registers.cpp: In member function 'void CameraOV7670Registers::init()':

C:\Users\Jack\Documents\Arduino\libraries\LiveOV7670_STM32\CameraOV7670Registers.cpp:14:3: error: 'mWire' was not declared in this scope

   mWire.begin();

   ^

C:\Users\Jack\Documents\Arduino\libraries\LiveOV7670_STM32\CameraOV7670Registers.cpp: In member function 'bool CameraOV7670Registers::setRegister(uint8_t, uint8_t)':

C:\Users\Jack\Documents\Arduino\libraries\LiveOV7670_STM32\CameraOV7670Registers.cpp:47:3: error: 'mWire' was not declared in this scope

   mWire.beginTransmission(i2cAddress);

   ^

C:\Users\Jack\Documents\Arduino\libraries\LiveOV7670_STM32\CameraOV7670Registers.cpp: In member function 'uint8_t CameraOV7670Registers::readRegister(uint8_t)':

C:\Users\Jack\Documents\Arduino\libraries\LiveOV7670_STM32\CameraOV7670Registers.cpp:66:3: error: 'mWire' was not declared in this scope

   mWire.beginTransmission(i2cAddress);

   ^

Byly nalezené násobné knihovny "Wire.h"
 Used: C:\Users\Jack\AppData\Local\Arduino15\packages\stm32duino\hardware\STM32F1\2018.7.2\libraries\Wire
 Unused: C:\Users\Jack\AppData\Local\Arduino15\packages\stm32duino\hardware\STM32F1\2018.7.2\libraries\WireSlave
exit status 1
Nastala chyba při kompilaci u desky Generic STM32F103C series.

Can you help me please? I tried downloading and including some a HardWire library but then had an unmet dependency which I did not pursue yet.

Tried to use this: http://downloads.arduino.cc/libraries/github.com/thexeno/HardWire-1.0.2.zip

[kozuch]

Fixed by changing HardWire mWire(2); to TwoWire mWire(2);

Now I get error 4 (other error) at mWire.endTransmission() in setRegister function. mWire.write reports 1 byte written for both addr and val.

[stevstrong]

Please post the complete error messages.

[kozuch]

It now compiles without error, I get the error 4 value at runtime by printing it to serial - I put logging in CameraOV7670Registers.cpp in bool CameraOV7670Registers::setRegister(uint8_t addr, uint8_t val) function. mWire.endTransmission() simply returns 4 instead of 0. I guess this is an I2C problem. I am not sure if my camera is not dead, but I have 2 of them and both giving the same error. I think I connected everything correctly, additionally tried on camera the RESET pin to 3.3V and PWDN to ground, did not help.

I have a little different camera module than is usual - my camera is similar to the image on the left here, while the camera from the various videos is usually the one on the right: https://forum.arduino.cc/index.php?topic=535819.0

Exact photos of my camera:
https://photos.app.goo.gl/vUySrQZJQJDwMZvx5

[stevstrong]

I will check this soon.

[kozuch]

Thanks, but you don't have to any more. The problem was you used i2c bus #2 in code but your pin wiring uses bus #1. This code change fixes it:

TwoWire mWire(1);

Now the camera inits already.

[stevstrong]

9829eaf should fix it.