基于MindSDK测试MM32F5270开发板IIC

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();

}

}

}