- static I2C_MasterXfer_Type app_i2c_xfer;
- volatile static bool app_i2c_xfer_done; /* Xfer done flag. */
- static uint8_t app_i2c_rx_buf[APP_I2C_BUF_LEN]; /* I2C rx buffer. */
- static uint8_t app_i2c_tx_buf[APP_I2C_BUF_LEN]; /* I2C tx buffer. */
- /*
- * Declerations.
- */
- void app_i2c_init(void);
- void app_i2c_detect(void);
- void app_i2c_rx_abort_callback(void *param);
- void app_i2c_rx_done_callback(void *param);
- void app_swdelay(uint32_t ms);
- /*
- * Functions.
- */
- int main(void)
- {
- BOARD_Init();
- printf("i2c_master_detect example.\r\n");
- /* Initialize I2C. */
- app_i2c_init();
- while (1)
- {
- printf("press any key to detect I2C.\r\n");
- getchar();
- app_i2c_detect(); /* Detect operation. */
- }
- }
- /* Detect the operation of write and read. */
- void app_i2c_detect()
- {
- for (uint16_t i = 0x00u; i <= 0xFEu; i += 2u) /* 7bit address is (device address >> 1) ,so judge next address need add 2 in address now. */
- {
- printf("target: 0x%02X, ", i);
- app_i2c_xfer.TargetAddr = i >> 1u; /* Setup target deveice address. */
- app_i2c_xfer.Direction = I2C_Direction_Rx; /* Setup the xfer direction. */
- app_i2c_xfer.TxBuf = app_i2c_tx_buf; /* Setup xfer buffer. */
- app_i2c_xfer.RxBuf = app_i2c_rx_buf; /* Setup rx buffer. */
- app_i2c_xfer.TxLen = APP_I2C_TX_LEN; /* Setup xfer buffer data length. */
- app_i2c_xfer.RxLen = APP_I2C_RX_LEN; /* Setup xfer buffer data length. */
- app_i2c_xfer.AbortCallback = app_i2c_rx_abort_callback; /* Receive abort callback. */
- app_i2c_xfer.DoneCallback = app_i2c_rx_done_callback; /* Receive done callback. */
- app_i2c_xfer_done = false; /* Setup xfer done flag to xfer not done. */
- /* The target device address needs to be configured before enable. */
- I2C_Enable(BOARD_I2C_PORT, false);
- I2C_SetTargetAddr(BOARD_I2C_PORT, app_i2c_xfer.TargetAddr); /* Set target device address. */
- I2C_Enable(BOARD_I2C_PORT, true);
- I2C_MasterXfer(BOARD_I2C_PORT, &app_i2c_xfer);
- while (false == app_i2c_xfer_done) /* Waiting for xfer done. */
- {
- }
- app_swdelay(10u);
- }
- }
- /* Initialize I2C. */
- void app_i2c_init(void)
- {
- RCC_EnableAPB1Periphs(RCC_APB1_PERIPH_I2C1, true);/* Enable I2C1 clock of APB1 peripheral. */
- I2C_Master_Init_Type i2c_initmaster;
- /* Configure I2C initialization. */
- i2c_initmaster.ClockFreqHz = BOARD_I2C_FREQ;
- i2c_initmaster.BaudRate = I2C_BaudRate_100K;
- /* Initialize I2C master. */
- I2C_InitMaster(BOARD_I2C_PORT, &i2c_initmaster);
- /* Enable I2C. */
- I2C_Enable(BOARD_I2C_PORT, true);
- /* Enable NVIC. */
- NVIC_EnableIRQ(BOARD_I2C_IRQn);
- }
- /* I2C interrupt handler. */
- void BOARD_I2C_IRQHandler(void)
- {
- uint32_t flag = I2C_GetInterruptStatus(BOARD_I2C_PORT); /* Get current interrupt status. */
- I2C_ClearInterruptStatus(BOARD_I2C_PORT, flag); /* Clear all software clear the interrupt. */
- I2C_MasterXferHandler(BOARD_I2C_PORT, &app_i2c_xfer, flag); /* I2C master xfer interrupt handler. */
- }
- /* When I2C received done, use app_i2c_rx_done_callback. */
- void app_i2c_rx_done_callback(void *param)
- {
- printf("device exists.\r\n");
- app_i2c_xfer_done = true;
- }
- /* When I2C received abort, use app_i2c_rx_abort_callback. */
- void app_i2c_rx_abort_callback(void *param)
- {
- printf("device not exists.\r\n");
- app_i2c_xfer_done = true;
- }
- /* Software delay millisecond. */
- void app_swdelay(uint32_t ms)
- {
- for (uint32_t i = 0u; i < ms; i++)
- {
- for (uint32_t j = 0u; j < (CLOCK_SYS_FREQ / 1000u); j++)
- {
- __NOP();
- }
- }
- }
| 
楼主
