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I2C bus reset with info to user

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I2C slave might stil have something to send when ESP826 starts I2C, thus
keeping the bus stuck.
Happens e.g. when power failure/reset during transmission.
Thanks to work of drmpf there is a solution.
Implemented as separate method so as not to interfere with existing.
Usage:

Wire.begin();
if (Wire.status() != I2C_OK) Serial.writeln("Something wrong with I2C
bus that cannot be recovered. Perform power cycle or search for other
masters on bus.";
This commit is contained in:
Dave P
2016-05-26 12:53:48 +02:00
parent 5313c56f24
commit 099f3a4147
4 changed files with 27 additions and 0 deletions
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4
libraries/Wire/Wire.cpp
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@ -77,6 +77,10 @@ void TwoWire::begin(uint8_t address){
begin();
}
uint8_t TwoWire::status(){
return twi_status();
}
void TwoWire::begin(int address){
begin((uint8_t)address);
}

1
libraries/Wire/Wire.h
View File

@ -62,6 +62,7 @@ class TwoWire : public Stream
uint8_t endTransmission(void);
uint8_t endTransmission(uint8_t);
size_t requestFrom(uint8_t address, size_t size, bool sendStop);
uint8_t status();
uint8_t requestFrom(uint8_t, uint8_t);
uint8_t requestFrom(uint8_t, uint8_t, uint8_t);