diff options
| author | Cristian Maglie <c.maglie@bug.st> | 2014-07-02 15:37:30 +0200 |
|---|---|---|
| committer | Cristian Maglie <c.maglie@bug.st> | 2014-07-02 15:37:30 +0200 |
| commit | cb4ae51b425568c7d404798ec4010660c46a5638 (patch) | |
| tree | 52db08fc0ff40d0d9eb90f1d0c5d957cfbc9ec65 | |
| parent | e7c3527a99e44416e97fe22534875df1ca5df9c0 (diff) | |
| parent | 5216e551a5b90f8744a4a7e18e531da16d1261ad (diff) | |
Merge pull request #1912 from Lauszus/issues440
Enable user to change the I2C clock frequency by calling setClock in the Wire library
| -rw-r--r-- | libraries/Wire/Wire.cpp | 5 | ||||
| -rw-r--r-- | libraries/Wire/Wire.h | 5 | ||||
| -rw-r--r-- | libraries/Wire/keywords.txt | 1 |
3 files changed, 9 insertions, 2 deletions
diff --git a/libraries/Wire/Wire.cpp b/libraries/Wire/Wire.cpp index 4e7a17c..553add7 100644 --- a/libraries/Wire/Wire.cpp +++ b/libraries/Wire/Wire.cpp @@ -75,6 +75,11 @@ void TwoWire::begin(int address) begin((uint8_t)address); } +void TwoWire::setClock(uint32_t frequency) +{ + TWBR = ((F_CPU / frequency) - 16) / 2; +} + uint8_t TwoWire::requestFrom(uint8_t address, uint8_t quantity, uint8_t sendStop) { // clamp to buffer length diff --git a/libraries/Wire/Wire.h b/libraries/Wire/Wire.h index a93d0f5..732bdc3 100644 --- a/libraries/Wire/Wire.h +++ b/libraries/Wire/Wire.h @@ -49,6 +49,7 @@ class TwoWire : public Stream void begin(); void begin(uint8_t); void begin(int); + void setClock(uint32_t); void beginTransmission(uint8_t); void beginTransmission(int); uint8_t endTransmission(void); @@ -62,10 +63,10 @@ class TwoWire : public Stream virtual int available(void); virtual int read(void); virtual int peek(void); - virtual void flush(void); + virtual void flush(void); void onReceive( void (*)(int) ); void onRequest( void (*)(void) ); - + inline size_t write(unsigned long n) { return write((uint8_t)n); } inline size_t write(long n) { return write((uint8_t)n); } inline size_t write(unsigned int n) { return write((uint8_t)n); } diff --git a/libraries/Wire/keywords.txt b/libraries/Wire/keywords.txt index 12f129b..ff31475 100644 --- a/libraries/Wire/keywords.txt +++ b/libraries/Wire/keywords.txt @@ -11,6 +11,7 @@ ####################################### begin KEYWORD2 +setClock KEYWORD2 beginTransmission KEYWORD2 endTransmission KEYWORD2 requestFrom KEYWORD2 |