我正在使用STM32F373微控制器,并写了一个简单的函数来读取总线i2c 1(PB7 PB6)上MPU6050陀螺仪+加速器的数据。 问题是,当我尝试读取传感器寄存器数据时 - 标志I2C_ISR_TXIS总是等于RESET(未设置)。 为什么会发生这种情况?STM32F3 I2C读取数据
这里是问题的源代码。
void i2c1_init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
I2C_InitTypeDef I2C_InitStructure;
RCC_I2CCLKConfig(RCC_I2C1CLK_SYSCLK);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1, ENABLE);
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOB, ENABLE);
GPIO_PinAFConfig(GPIOB, GPIO_PinSource6, GPIO_AF_4);
GPIO_PinAFConfig(GPIOB, GPIO_PinSource7, GPIO_AF_4);
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_OType = GPIO_OType_OD;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
GPIO_Init(GPIOB, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7;
GPIO_Init(GPIOB, &GPIO_InitStructure);
I2C_DeInit(I2C1);
I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
I2C_InitStructure.I2C_AnalogFilter = I2C_AnalogFilter_Enable;
I2C_InitStructure.I2C_DigitalFilter = 0x00;
I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
I2C_InitStructure.I2C_Timing = 0xC062121F;
I2C_Init(I2C1, &I2C_InitStructure);
I2C_Cmd(I2C1, ENABLE);
}
uint8_t i2c_read(uint8_t DeviceAddr, uint8_t RegAddr, uint8_t* pBuffer, uint16_t len)
{
/* Test on BUSY Flag */
uint32_t timeout = I2C_TIMEOUT;
while(I2C_GetFlagStatus(I2C1, I2C_ISR_BUSY) != RESET)
{
if((timeout--) == 0) return 0;
}
I2C_TransferHandling(I2C1, DeviceAddr, 1, I2C_SoftEnd_Mode, I2C_Generate_Start_Write);
/* !!! Wait until TXIS flag is set !!! */
timeout = I2C_TIMEOUT;
while(I2C_GetFlagStatus(I2C1, I2C_ISR_TXIS) == RESET) // PROBLEM HERE!!!!!!!!!!!!!!!
{
if((timeout--) == 0) return 0;
}
....
....
}
也许向我们展示'I2C_GetFlagStatus'的来源? –
I2C_TransferHandling是外设库的一部分吗?从STM32F2xx版本开始,这一定是一个新的增加。 – rjp