ESP32 I2C Write.read just read 0

[arnold-b]

Hello Together,

#define _sda 21 //16
#define _scl 22 // 17

Wire.setClock(400000);
Wire.begin(_sda, _scl,400000);
Wire.beginTransmission(0x5D);

uint8_t w1 = Wire.write(0x81);
uint8_t w2 = Wire.write(0x40);
int error = Wire.endTransmission(false);

Wire.requestFrom(0x5D, 11);

uint8_t data = 0;
while (Wire.available()) {
data = Wire.read();
Serial.println(data );
}
Wire.endTransmission(true);

Result is jus a a lot 0. In logic analyser i get the right values.

Is there anyone who succeed

[stickbreaker]

Known problem in Release 1.0.0.

Either install the dev version from this repo, or just replace the 4 i2c files.

See #1962

Chuck.

[arnold-b]

Thanks i will try. I searched a few hours and didn’t find any solution. And I didn’t think that’s a problem. Because in eclipse it work Von: chuck todd <notifications@github.com> Gesendet: Sonntag, 18. November 2018 16:00 An: espressif/arduino-esp32 <arduino-esp32@noreply.github.com> Cc: arnold-b <arnold.braun@gmx.de>; Author <author@noreply.github.com> Betreff: Re: [espressif/arduino-esp32] ESP32 I2C Write.read just read 0 (#2069) Known problem in Release 1.0.0. Either install the dev version from this repo, or just replace the 4 i2c files. See #1962 <#1962> Chuck. — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#2069 (comment)> , or mute the thread <https://github.com/notifications/unsubscribe-auth/AfTd2cIwhx2eH_T5ckkPs_mUTq0yDe9Aks5uwXXrgaJpZM4Yn3IA> . <https://github.com/notifications/beacon/AfTd2UsPzfPhGtXXMpTGiNJFJ0Ylk9Oaks5uwXXrgaJpZM4Yn3IA.gif>

[stickbreaker]

@arnold-b if you installed using the Arduino Board Manager, it installed the faulty release. The dev repo version is correct and working.

Chuck.

[arnold-b]

Hey, do you mean arduino-esp32-1.0-rc4 ? because I tried this one and it still not working Von: chuck todd <notifications@github.com> Gesendet: Sonntag, 18. November 2018 17:05 An: espressif/arduino-esp32 <arduino-esp32@noreply.github.com> Cc: arnold-b <arnold.braun@gmx.de>; Mention <mention@noreply.github.com> Betreff: Re: [espressif/arduino-esp32] ESP32 I2C Write.read just read 0 (#2069) @arnold-b <https://github.com/arnold-b> if you installed using the Arduino Board Manager, it installed the faulty release. The dev repo version is correct and working. Chuck. — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#2069 (comment)> , or mute the thread <https://github.com/notifications/unsubscribe-auth/AfTd2UbxkdAaR6UXiYtX9v9RHEzfSTzPks5uwYUbgaJpZM4Yn3IA> . <https://github.com/notifications/beacon/AfTd2YTQ3bjaZVamRWuvKiJUDDDsh3owks5uwYUbgaJpZM4Yn3IA.gif>

[stickbreaker]

@arnold-b the best working files are in this repo. Between RC1 and Release 1.0.0 there were multiple changes to I2C, Between RC4 and Release 1.0.0 I resolved a problem with interrupt saturation. During this major rewrite, I made a mistake. It manifested when using a Write ReSTART operation. (Wire.endTransmission(false);) as you noticed, the subsequent Read operation does not return any data.

just follow the instruction in #1962, copy the four files from this repo. replace the four same your Arduino installation with those file.

• \cores\esp32\esp32-hal-i2c.h
• \cores\esp32\esp32-hal-i2c.c
• \libraries\Wire\src\Wire.h
• \libraries\Wire\src\Wire.cpp

You have a couple of problems with your code:

#define _sda 21 //16
#define _scl 22 // 17

//Wire.setClock(400000);  //Wire.begin() needs to be first
Wire.begin(_sda, _scl,400000);
Wire.beginTransmission(0x5D);

uint8_t w1 = Wire.write(0x81); // w1 will be 0 if there is no room in the output buffer (128 max), or 1 as success
uint8_t w2 = Wire.write(0x40); // same as w1
int error = Wire.endTransmission(false); // will return error code

if(error != I2C_ERROR_CONTINUE){ // because of ReSTART operation, Normally I2C_ERROR_OK
   Serial.printf(" I2C write terminated with error: %d(%s)\n",Wire.lastError(),Wire.getErrorText(Wire.lastError()));
}

uint8_t count =Wire.requestFrom(0x5D, 11);

if(Wire.lastError() != I2C_ERROR_OK){ 
   Serial.printf(" I2C Read returned %d characters, terminated with error: %d(%s)\n", count, Wire.lastError(), Wire.getErrorText(Wire.lastError()));
}

uint8_t data = 0;
while (Wire.available()) {
  data = Wire.read();
  Serial.println(data );
  }
//Wire.endTransmission(true); // must be paired with Wire.beginTransmission()

Chuck.

[arnold-b]

Hey , thanks Just now i try to install the whole repo and I have different problem. Collect2.exe error with uart C:\Users\Braun\AppData\Local\Arduino15\packages\esp32\hardware\esp32\1.0.0/tools/sdk/lib\libdriver.a(uart.o): In function `uart_flush_input': /Users/ficeto/Desktop/ESP32/ESP32/esp-idf-public/components/driver/uart.c:1246: undefined reference to `vRingbufferReturnItem' It looks like there is some fixed user path Von: chuck todd <notifications@github.com> Gesendet: Sonntag, 18. November 2018 18:11 An: espressif/arduino-esp32 <arduino-esp32@noreply.github.com> Cc: arnold-b <arnold.braun@gmx.de>; Mention <mention@noreply.github.com> Betreff: Re: [espressif/arduino-esp32] ESP32 I2C Write.read just read 0 (#2069) @arnold-b <https://github.com/arnold-b> the best working files are in this repo. Between RC1 and Release 1.0.0 there were multiple changes to I2C, Between RC4 and Release 1.0.0 I resolved a problem with interrupt saturation. During this major rewrite, I made a mistake. It manifested when using a Write ReSTART operation. (Wire.endTransmission(false);) as you noticed, the subsequent Read operation does not return any data. just follow the instruction in #1962 <#1962> , copy the four files from this repo. replace the four same your Arduino installation with those file. * \cores\esp32\esp32-hal-i2c.h * \cores\esp32\esp32-hal-i2c.c * \libraries\Wire\src\Wire.h * \libraries\Wire\src\Wire.cpp You have a couple of problems with your code: #define _sda 21 //16 #define _scl 22 // 17 //Wire.setClock(400000); //Wire.begin() needs to be first Wire.begin(_sda, _scl,400000); Wire.beginTransmission(0x5D); uint8_t w1 = Wire.write(0x81); // w1 will be 0 if there is no room in the output buffer (128 max), or 1 as success uint8_t w2 = Wire.write(0x40); // same as w1 int error = Wire.endTransmission(false); // will return error code if(error != I2C_ERROR_CONTINUE){ // because of ReSTART operation, Normally I2C_ERROR_OK Serial.printf(" I2C write terminated with error: %d(%s)\n",Wire.lastError(),Wire.getErrorText(Wire.lastError())); } uint8_t count =Wire.requestFrom(0x5D, 11); if(Wire.lastError() != I2C_ERROR_OK){ Serial.printf(" I2C Read returned %d characters, terminated with error: %d(%s)\n", count, Wire.lastError(), Wire.getErrorText(Wire.lastError())); } uint8_t data = 0; while (Wire.available()) { data = Wire.read(); Serial.println(data ); } //Wire.endTransmission(true); // must be paired with Wire.beginTransmission() Chuck. — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#2069 (comment)> , or mute the thread <https://github.com/notifications/unsubscribe-auth/AfTd2bVsh2vpwOBSKxqKBntK4equWjq5ks5uwZSVgaJpZM4Yn3IA> . <https://github.com/notifications/beacon/AfTd2QkKJ9wxhfqXNU0SIxv93HEl1gX9ks5uwZSVgaJpZM4Yn3IA.gif>

[stickbreaker]

@arnold-b

Wait for git to pull any changes and close Git GUI
Step 4 Open [ARDUINO_SKETCHBOOK_DIR]/hardware/espressif/esp32/tools and double-click get.exe

Did you follow all the instructions?

Make sure you run the get.exe from the tools directory.

Shutdown and restart the Arduino IDE,

You will have to reselect your board inside the Arduino IDE to tell it to use this newly installed core.

Adding the entire dev Repo adds a second set of boards to the boards list. Scroll completely down the boards list, you will notice a second ESP32 Arduino list of boards. too ease confusion I change the title text in my platform.txt files. The first line

name=EPS32 Arduino

to:

name=ESP32 Github Version

Under Windows 7:

• Board Manager version (release 1.0.0) is located in:
  C:\Users\{your user name}\AppData\Local\Arduino15\packages\esp32\hardware\esp32\1.0.0\
• GitHub Dev version:
  C:\Users\{your user name}\Documents\Arduino\hardware\espressif\esp32

Chuck.

[arnold-b]

Sorry, i didnt. I just copied the Master .zip then I changed the SDK to my old one. I2C works now. But I will change again and follow your instruction. Thanks Again Von: chuck todd <notifications@github.com> Gesendet: Sonntag, 18. November 2018 18:33 An: espressif/arduino-esp32 <arduino-esp32@noreply.github.com> Cc: arnold-b <arnold.braun@gmx.de>; Mention <mention@noreply.github.com> Betreff: Re: [espressif/arduino-esp32] ESP32 I2C Write.read just read 0 (#2069) @arnold-b <https://github.com/arnold-b> Wait for git to pull any changes and close Git GUI Step 4 Open [ARDUINO_SKETCHBOOK_DIR]/hardware/espressif/esp32/tools and double-click get.exe Did you follow all the instructions? Make sure you run the get.exe from the tools directory. Shutdown and restart the Arduino IDE, You will have to reselect your board inside the Arduino IDE to tell it to use this newly installed core. Adding the entire dev Repo adds a second set of boards to the boards list. Scroll completely down the boards list, you will notice a second ESP32 Arduino list of boards. too ease confusion I change the title text in my platform.txt files. The first line name=EPS32 Arduino to: name=ESP32 Github Version Under Windows 7: * Board Manager version (release 1.0.0) is located in: C:\Users\{your user name}\AppData\Local\Arduino15\packages\esp32\hardware\esp32\1.0.0\ * GitHub Dev version: C:\Users\{your user name}\Documents\Arduino\hardware\espressif\esp32 Chuck. — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#2069 (comment)> , or mute the thread <https://github.com/notifications/unsubscribe-auth/AfTd2RR_aRlAhNlxidtgY9VZhP1jBfllks5uwZm9gaJpZM4Yn3IA> . <https://github.com/notifications/beacon/AfTd2eJD0nx8FXmI6irhAPGncbtQoK21ks5uwZm9gaJpZM4Yn3IA.gif>

[arnold-b]

Problem solved with #1962

Thanks for your help