I2CRTOS Driver by Helmut Schmücker. Removed included mbed-rtos library to prevent multiple definition. Make sure to include mbed-rtos library in your program!
Fork of I2cRtosDriver by
Diff: I2CDriver.h
- Revision:
- 6:5b98c902a659
- Parent:
- 5:8a418c89e515
- Child:
- 7:04824382eafb
diff -r 8a418c89e515 -r 5b98c902a659 I2CDriver.h --- a/I2CDriver.h Sat Apr 20 11:56:35 2013 +0000 +++ b/I2CDriver.h Sat Apr 20 20:06:44 2013 +0000 @@ -178,26 +178,18 @@ ///Creates a stop condition on the I2C bus void stopMaster(void); - - /// Wait until the i2c driver becomes available. /// /// Useful if you want to run a sequence of command without interrution by another thread. /// There's no need to call this function for running single request, because all driver functions /// will lock the device for exclusive access automatically. - void lock() { - // One and the same thread can lock twice, but then it needs also to unlock twice. - // exactly what we need here - m_channel->mutex.lock(osWaitForever); - } + void lock(); /// Unlock the driver that has previously been locked by the same thread. - void unlock() { - m_channel->mutex.unlock(); - } + void unlock(); protected: - // commands sent from user to drive thread + // commands sent from user to drive thread enum Command { START, STOP, @@ -210,7 +202,7 @@ WRITE_BYTE, RECEIVE }; - + // data transfer struct for communication between user and driver thread struct Transfer { Command cmd; @@ -228,36 +220,42 @@ osThreadId caller; }; - // structure that holds handles/locks for accessing the I2C channels + // structure that holds handles/locks for accessing the I2C channels struct Channel { - osThreadId driver; + osThreadId driver; rtos::Mutex mutex; volatile Transfer transfer; }; - + // current frequency setting int m_freq; // current slave address setting int m_slaveAdr; - + // prio of current caller thread + osPriority m_callerPrio; + // ID of current caller thread + osThreadId m_callerID; + + // i2c driver prio + static const osPriority c_drvPrio = osPriorityRealtime; // the pin names fo the i2c channels static const PinName c_sdas[2]; static const PinName c_scls[2]; - // static storage for the I2C channel access objects + // static storage for the I2C channel access objects static Channel* s_channels[2]; - + // i2c channel object of this driver interface, in fact just pointer /// to one of the entries in s_channels Channel* m_channel; - - // ISRs + + // ISRs static void channel_0_ISR(); static void channel_1_ISR(); - + // the driver thread function static void threadFun(void const *args); - + int sendNwait(); }; }