硬件电路
开发板上I2C硬件电路
使用PC6和PC7端口的I2C1接口
* 程序部分
引脚配置
void BOARD_InitPins(void)
{
/* PB6 - UART1_TX. */
GPIO_Init_Type gpio_init;
gpio_init.Pins = GPIO_PIN_6;
gpio_init.PinMode = GPIO_PinMode_AF_PushPull;
gpio_init.Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &gpio_init);
GPIO_PinAFConf(GPIOB, gpio_init.Pins, GPIO_AF_7);
/* PB7 - UART1_RX. */
gpio_init.Pins = GPIO_PIN_7;
gpio_init.PinMode = GPIO_PinMode_In_Floating;
gpio_init.Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &gpio_init);
GPIO_PinAFConf(GPIOB, gpio_init.Pins, GPIO_AF_7);
/* PC6 - I2C1_SCL. */
gpio_init.Pins = GPIO_PIN_6;
gpio_init.PinMode = GPIO_PinMode_AF_OpenDrain;
gpio_init.Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOC, &gpio_init);
GPIO_PinAFConf(GPIOC, gpio_init.Pins, GPIO_AF_4);
/* PC7 - I2C1_SDA. */
gpio_init.Pins = GPIO_PIN_7;
gpio_init.PinMode = GPIO_PinMode_AF_OpenDrain;
gpio_init.Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOC, &gpio_init);
GPIO_PinAFConf(GPIOC, gpio_init.Pins, GPIO_AF_4);
}
main.c
int main(void)
{
uint32_t i;
uint8_t i2c_txdat[8];
uint8_t i2c_rxdat[8];
BOARD_Init();
app_i2c_init();
printf("\r\ni2c_master_basic example\r\n");
/* Initialize I2C. */
i2c_txdat[0] = 0x00;
i2c_txdat[1] = 0x01;
i2c_txdat[2] = 0x55;
i2c_txdat[3] = 0xaa;
i2c_txdat[4] = 0xff;
i2c_txdat[5] = 0x5f;
i2c_txdat[6] = 0xf5;
i2c_txdat[7] = 0xaa;
if( false == app_i2c_write(8, i2c_txdat) )
{
printf("I2C write failed.\r\n");
}
else
{
printf("write data: ");
for (i = 0u; i < 8; i++)
{
printf("0x%02X, ", i2c_txdat);
}
printf("\r\n");
}
if ( false == app_i2c_read(7, i2c_rxdat) ) /* Received data successfully. */
{
printf("I2C read failed.\r\n");
}
else
{
printf("read data: ");
for (i = 0u; i < 7; i++)
{
printf("0x%02X, ", i2c_rxdat);
}
printf("\r\n");
}
while(1);
}
初始化和收发代码
/* Initialize I2C */
void app_i2c_init(void)
{
/* Setup I2C initialization values. */
I2C_Master_Init_Type i2c_init;
i2c_init.ClockFreqHz = BOARD_I2C_FREQ;
i2c_init.BaudRate = I2C_BaudRate_100K;
/* Initialize I2C master. */
I2C_InitMaster(BOARD_I2C_PORT, &i2c_init);
/* The target device address needs to be configured before enabling. */
I2C_SetTargetAddr(BOARD_I2C_PORT, APP_I2C_TARGET_ADDR);
/* Enable I2C. */
I2C_Enable(BOARD_I2C_PORT, true);
}
/* Write data to target device, true to writing succeed, false to writing failed. */
bool app_i2c_write(uint8_t txlen, uint8_t *txbuf)
{
app_i2c_xfer.WaitTimes = APP_I2C_TIMEOUT_TIME;
app_i2c_xfer.TxBuf = txbuf;
app_i2c_xfer.TxLen = txlen;
I2C_Enable(BOARD_I2C_PORT, true); /* Disable I2C to clear tx fifo, and enabled I2C to perform the write operation again. */
if ( false == I2C_MasterWriteBlocking(BOARD_I2C_PORT, &app_i2c_xfer) )
{
return false;
}
else
{
return true;
}
}
/* Read data to target device, true to reading succeed, false to reading failed. */
bool app_i2c_read(uint8_t rxlen, uint8_t *rxbuf)
{
app_i2c_xfer.WaitTimes = APP_I2C_TIMEOUT_TIME;
app_i2c_xfer.RxBuf = rxbuf;
app_i2c_xfer.RxLen = rxlen;
I2C_Enable(BOARD_I2C_PORT, true); /* Disable I2C to clear tx fifo, and enabled I2C to perform the read operation again. */
if ( false == I2C_MasterReadBlocking(BOARD_I2C_PORT, &app_i2c_xfer) )
{
return false;
}
else
{
return true;
}
}
* 运行结果
开发板上电，先向地址0x00开始写8个字节的数据，在从地址0x00读出8个字节的数据。
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版权声明：本文为CSDN博主「极术社区」的原创文章，遵循CC 4.0 BY-SA版权协议，转载请附上原文出处链接及本声明。
原文链接：https://blog.csdn.net/weixin_47569031/article/details/127427055
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