| 0,0 → 1,64 |
|---|
| #ifndef __I2C_H |
| #define __I2C_H |
| |
| #include "91x_lib.h" |
| |
| // 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 |
| // I2C Errors |
| #define I2C_ERROR_NONE 0 |
| #define I2C_ERROR_UNKNOWN 1 |
| #define I2C_ERROR_NOACK 2 |
| |
| // 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); |
| |
| |
| typedef struct |
| { |
| u8 State; // bus status |
| u8 Error; // bus error code |
| u32 Timeout; // # time of last transfer |
| u8 *pData; // # data buffer |
| u8 TxBufferSize; // # of bytes to send |
| u8 RxBufferSize; // # of bytes to read |
| u8 Direction; // bus direction |
| u8 SlaveAddr; // slave address |
| u16 VIC_Source; // irq source |
| I2C_pRxHandler_t pRxHandler; // function pointer to call back handler after transfer |
| } __attribute__((packed)) I2C_Bus_t; |
| |
| #define I2C_TIMEOUT 500 // 500 ms |
| #define I2C_BUFFER_LEN 200 // define the size of the rx/tx buffer in bytes |
| |
| // Retourns pointer to data structure of the selected bus |
| volatile I2C_Bus_t* I2CBus(I2C_TypeDef* I2Cx); |
| |
| // initialize the I2C bus |
| void I2CBus_Init(I2C_TypeDef* I2Cx); |
| // deinitialize the I2C bus |
| void I2CBus_Deinit(I2C_TypeDef* I2Cx); |
| // try to allocate the I2C_Buffer within the timeout limit |
| // returns 1 on success |
| u8 I2CBus_LockBuffer(I2C_TypeDef* I2Cx, u32 timeout); |
| // Initiate i2c transmission |
| // A transmission sends first TxBytes from pTxData to slave |
| // and then RxBytes are read from slave to internal 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 in the bus. |
| // returns 1 if a transmission has been started, returns 0 otherwise |
| u8 I2CBus_Transmission(I2C_TypeDef* I2Cx, u8 SlaveAddr, u8* pTxData, u8 TxBytes, I2C_pRxHandler_t pRxHandler, u8 RxBytes); |
| // wait until transmission progess is finished or timeout |
| // returns 1 if no timeout occurs |
| u8 I2CBus_WaitForEndOfTransmission(I2C_TypeDef* I2Cx, u32 timeout); |
| |
| #endif // I2C_H |
| |