STM32F407 IIC问题
各位大虾。小弟最近调试M4，IIC部分一直不能正常工作，谁能给出初始化代码借鉴一下啊。谢了。。
我的初始化代码如下：
VOID I2C_Configuration( VOID )
{
I2C_InitTypeDef I2C_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB1PeriphClockCmd( RCC_APB1Periph_I2C1, ENABLE );
RCC_AHB1PeriphClockCmd( RCC_AHB1Periph_GPIOB , ENABLE );
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);
/*管脚重映射*/
GPIO_PinAFConfig(GPIOB, GPIO_PinSource8, GPIO_AF_I2C1);
GPIO_PinAFConfig(GPIOB, GPIO_PinSource9, GPIO_AF_I2C1);
/* Configure I2C1 pins: PB8->SCL and PB9->SDA */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8|GPIO_Pin_9 ;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_OType_OD;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init( GPIOB, &GPIO_InitStructure );
I2C_DeInit( I2C1 );
I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;
I2C_InitStructure.I2C_OwnAddress1 = 0x30;
I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
I2C_InitStructure.I2C_ClockSpeed = 100000; /* 100K速度 */
I2C_Cmd( I2C1, ENABLE );
I2C_Init( I2C1, &I2C_InitStructure );
}
[解决办法]
我用103，IIC最终用模拟的。呵呵
[解决办法]
可以把GPIO初始化的部分去掉 PB8、PB9外接4.7k上拉电阻
[解决办法]
===================================================================
* How to use this driver
* ===================================================================
* 1. Enable peripheral clock using RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2Cx, ENABLE)
* function for I2C1, I2C2 or I2C3.
*
* 2. Enable SDA, SCL and SMBA (when used) GPIO clocks using
* RCC_AHBPeriphClockCmd() function.
*
* 3. Peripherals alternate function:
* - Connect the pin to the desired peripherals' Alternate
* Function (AF) using GPIO_PinAFConfig() function
* - Configure the desired pin in alternate function by:
* GPIO_InitStruct->GPIO_Mode = GPIO_Mode_AF
* - Select the type, pull-up/pull-down and output speed via
* GPIO_PuPd, GPIO_OType and GPIO_Speed members
* - Call GPIO_Init() function
* Recommended configuration is Push-Pull, Pull-up, Open-Drain.
* Add an external pull up if necessary (typically 4.7 KOhm).
*
* 4. Program the Mode, duty cycle , Own address, Ack, Speed and Acknowledged
* Address using the I2C_Init() function.
*
* 5. Optionally you can enable/configure the following parameters without
* re-initialization (i.e there is no need to call again I2C_Init() function):
* - Enable the acknowledge feature using I2C_AcknowledgeConfig() function
* - Enable the dual addressing mode using I2C_DualAddressCmd() function
* - Enable the general call using the I2C_GeneralCallCmd() function
* - Enable the clock stretching using I2C_StretchClockCmd() function
* - Enable the fast mode duty cycle using the I2C_FastModeDutyCycleConfig()
* function.
* - Configure the NACK position for Master Receiver mode in case of
* 2 bytes reception using the function I2C_NACKPositionConfig().
* - Enable the PEC Calculation using I2C_CalculatePEC() function
* - For SMBus Mode:
* - Enable the Address Resolution Protocol (ARP) using I2C_ARPCmd() function
* - Configure the SMBusAlert pin using I2C_SMBusAlertConfig() function
*
* 6. Enable the NVIC and the corresponding interrupt using the function
* I2C_ITConfig() if you need to use interrupt mode.
*
* 7. When using the DMA mode
* - Configure the DMA using DMA_Init() function
* - Active the needed channel Request using I2C_DMACmd() or
* I2C_DMALastTransferCmd() function.
* @note When using DMA mode, I2C interrupts may be used at the same time to
* control the communication flow (Start/Stop/Ack... events and errors).
*
* 8. Enable the I2C using the I2C_Cmd() function.
*
* 9. Enable the DMA using the DMA_Cmd() function when using DMA mode in the
* transfers.
