| 0,0 → 1,57 |
|---|
| #ifndef __I2C_H |
| #define __I2C_H |
| |
| extern volatile u32 I2C1_Timeout; |
| |
| // I2C states |
| #define I2C_STATE_UNDEF 0 |
| #define I2C_STATE_IDLE 1 |
| #define I2C_STATE_BUFFBUSY 2 |
| #define I2C_STATE_TX_PENDING 3 |
| #define I2C_STATE_TX_PROGRESS 4 |
| #define I2C_STATE_RX_PENDING 5 |
| #define I2C_STATE_RX_PROGRESS 6 |
| #define I2C_STATE_OFF 7 |
| |
| #define I2C_ERROR_NONE 0 |
| #define I2C_ERROR_UNKNOWN 1 |
| #define I2C_ERROR_NOACK 2 |
| |
| // current I2C state |
| extern volatile u8 I2C_State; |
| // the last I2C error |
| extern volatile u8 I2C_Error; |
| |
| #define I2C1_TIMEOUT 500 // 500 ms |
| |
| // define the size of the rx/tx buffer |
| #define I2C_BUFFER_LEN 100 |
| // transfer buffer should be filled after a successful |
| // I2C_LockBuffer(...) and before a start of transmission |
| // initiated by I2C_Transmission(...). |
| extern volatile u8 I2C_Buffer[]; |
| |
| void I2C1_Init(void); |
| |
| void I2C1_Deinit(void); |
| |
| // the pointer to the rxbuffer handler function |
| // called by the IRQ routine after all bytes are recieved from slave |
| typedef void (*I2C_pRxHandler_t) (u8* pRxBuffer, u8 RxBufferSize); |
| // Initiate i2c transmission |
| // A transmission sends first TxBytes from I2C_Buffer to slave |
| // and then RxBytes are read from slave to I2C_Buffer |
| // replacing the byte that have been sent. |
| // Then the RxHandler function is called to handle the result. |
| // This function returns imediatly after a start condition. |
| // returns 1 if a transmission has been started, otherwise 0 |
| u8 I2C_Transmission(u8 SlaveAddr, u8 TxBytes, I2C_pRxHandler_t pRxHandler, u8 RxBytes); |
| // try to allocate the I2C_Buffer within the timeout limit |
| // returns 1 on success |
| u8 I2C_LockBuffer(u32 timeout); |
| // wait until transmission progess is finished or timeout |
| // returns 1 if no timeout occurs |
| u8 I2C_WaitForEndOfTransmission(u32 timeout); |
| |
| #endif // I2C_H |
| |