GPIO_InitTypeDef GPIO_InitStructure;
/* 使能与 I2C1 有关的时钟 */
RCC_APB2PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1, ENABLE);
GPIO_PinAFConfig(GPIOB, GPIO_PinSource7, GPIO_AF_I2C1);
GPIO_PinAFConfig(GPIOB, GPIO_PinSource6, GPIO_AF_I2C1);
/* PB6-I2C1_SCL、PB7-I2C1_SDA */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_OType = GPIO_OType_OD;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(GPIOB, &GPIO_InitStructure);
I2C_InitTypeDef I2C_InitStructure;
/* I2C 配置 */
I2C_DeInit(I2C1);
I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;
I2C_InitStructure.I2C_OwnAddress1 = I2C1_OWN_ADDRESS7;
I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
I2C_InitStructure.I2C_ClockSpeed = I2C_Speed;
/* 使能 I2C1 */
I2C_Cmd(I2C1, ENABLE);
/* I2C1 初始化 */
I2C_Init(I2C1, &I2C_InitStructure);
I2C_AcknowledgeConfig(I2C1, ENABLE);
如上配置了I2C的初始化,可是,当要操作I2C时,先判断while (I2C_GetFlagStatus(I2C1, I2C_FLAG_BUSY));,结果卡住了,一直停着不动。
这是哪里配置问题呢?
我用的是st官网下的STM32F401-Discovery板子。
麻烦各位指点指点。谢谢 |