这是固件库对此函数的注解和代码
/**
* @brief Handles I2Cx communication when starting transfer or during transfer (TC or TCR flag are set).
* @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.
* @param Address: specifies the slave address to be programmed.
* @param Number_Bytes: specifies the number of bytes to be programmed.
* This parameter must be a value between 0 and 255.
* @param ReloadEndMode: new state of the I2C START condition generation.
* This parameter can be one of the following values:
* @arg I2C_Reload_Mode: Enable Reload mode .
* @arg I2C_AutoEnd_Mode: Enable Automatic end mode.
* @arg I2C_SoftEnd_Mode: Enable Software end mode.
* @param StartStopMode: new state of the I2C START condition generation.
* This parameter can be one of the following values:
* @arg I2C_No_StartStop: Don't Generate stop and start condition.
* @arg I2C_Generate_Stop: Generate stop condition (Number_Bytes should be set to 0).
* @arg I2C_Generate_Start_Read: Generate Restart for read request.
* @arg I2C_Generate_Start_Write: Generate Restart for write request.
* @retval None
*/
void I2C_TransferHandling(I2C_TypeDef* I2Cx, uint16_t Address, uint8_t Number_Bytes, uint32_t ReloadEndMode, uint32_t StartStopMode)
{
uint32_t tmpreg = 0;
/* Check the parameters */
assert_param(IS_I2C_ALL_PERIPH(I2Cx));
assert_param(IS_I2C_SLAVE_ADDRESS(Address));
assert_param(IS_RELOAD_END_MODE(ReloadEndMode));
assert_param(IS_START_STOP_MODE(StartStopMode));
/* Get the CR2 register value */
tmpreg = I2Cx->CR2;
/* update tmpreg */
tmpreg |= (uint32_t)(((uint32_t)Address & I2C_CR2_SADD) | (((uint32_t)Number_Bytes CR2 = tmpreg;
}
参数的宏定义
#define I2C_CR2_RELOAD ((uint32_t)0x01000000) /*!< NBYTES reload mode */
#define I2C_CR2_AUTOEND ((uint32_t)0x02000000) /*!< Automatic end mode (master mode) *
#define I2C_Reload_Mode I2C_CR2_RELOAD
#define I2C_AutoEnd_Mode I2C_CR2_AUTOEND
#define I2C_SoftEnd_Mode ((uint32_t)0x00000000)
我参考的是F05x的编程手册（不知道我参考的编程手册是否适合F03x）
Bit 25 AUTOEND : Automatic end mode (master mode)
This bit is set and cleared by software.
0: software end mode: TC flag is set when NBYTES data are transferred, stretching SCL low.
1: Automatic end mode: a STOP condition is automatically sent when NBYTES data are
transferred.
Note: This bit has no effect in slave mode or when the RELOAD bit is set.
Bit 24 RELOAD: NBYTES reload mode
This bit is set and cleared by software.
0: The transfer is completed after the NBYTES data transfer (STOP or RESTART will follow).
1: The transfer is not completed after the NBYTES data transfer (NBYTES will be reloaded).
TCR flag is set when NBYTES data are transferred, stretching SCL low.
从上述的资料显示应该不是说要发送停止位
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回复:STM32F030的I2C发送数据疑惑 求解答 谢谢
I2C_SoftEnd_Mode，说明要发送停止位了。这个只是一个定义，为了方便大家理解这个标志位用来做什么。
这是固件库对此函数的注解和代码
/**
* @brief Handles I2Cx communication when starting transfer or during transfer (TC or TCR flag are set).
* @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.
* @param Address: specifies the slave address to be programmed.
* @param Number_Bytes: specifies the number of bytes to be programmed.
* This parameter must be a value between 0 and 255.
* @param ReloadEndMode: new state of the I2C START condition generation.
* This parameter can be one of the following values:
* @arg I2C_Reload_Mode: Enable Reload mode .
* @arg I2C_AutoEnd_Mode: Enable Automatic end mode.
* @arg I2C_SoftEnd_Mode: Enable Software end mode.
* @param StartStopMode: new state of the I2C START condition generation.
* This parameter can be one of the following values:
* @arg I2C_No_StartStop: Don't Generate stop and start condition.
* @arg I2C_Generate_Stop: Generate stop condition (Number_Bytes should be set to 0).
* @arg I2C_Generate_Start_Read: Generate Restart for read request.
* @arg I2C_Generate_Start_Write: Generate Restart for write request.
* @retval None
*/
void I2C_TransferHandling(I2C_TypeDef* I2Cx, uint16_t Address, uint8_t Number_Bytes, uint32_t ReloadEndMode, uint32_t StartStopMode)
{
uint32_t tmpreg = 0;
/* Check the parameters */
assert_param(IS_I2C_ALL_PERIPH(I2Cx));
assert_param(IS_I2C_SLAVE_ADDRESS(Address));
assert_param(IS_RELOAD_END_MODE(ReloadEndMode));
assert_param(IS_START_STOP_MODE(StartStopMode));
/* Get the CR2 register value */
tmpreg = I2Cx->CR2;
/* clear tmpreg specific bits */
tmpreg &= (uint32_t)~((uint32_t)(I2C_CR2_SADD | I2C_CR2_NBYTES | I2C_CR2_RELOAD | I2C_CR2_AUTOEND | I2C_CR2_RD_WRN | I2C_CR2_START | I2C_CR2_STOP));
/* update tmpreg */
tmpreg |= (uint32_t)(((uint32_t)Address & I2C_CR2_SADD) | (((uint32_t)Number_Bytes CR2 = tmpreg;
}
参数的宏定义
#define I2C_CR2_RELOAD ((uint32_t)0x01000000) /*!< NBYTES reload mode */
#define I2C_CR2_AUTOEND ((uint32_t)0x02000000) /*!< Automatic end mode (master mode) *
#define I2C_Reload_Mode I2C_CR2_RELOAD
#define I2C_AutoEnd_Mode I2C_CR2_AUTOEND
#define I2C_SoftEnd_Mode ((uint32_t)0x00000000)
我参考的是F05x的编程手册（不知道我参考的编程手册是否适合F03x）
Bit 25 AUTOEND : Automatic end mode (master mode)
This bit is set and cleared by software.
0: software end mode: TC flag is set when NBYTES data are transferred, stretching SCL low.
1: Automatic end mode: a STOP condition is automatically sent when NBYTES data are
transferred.
Note: This bit has no effect in slave mode or when the RELOAD bit is set.
Bit 24 RELOAD: NBYTES reload mode
This bit is set and cleared by software.
0: The transfer is completed after the NBYTES data transfer (STOP or RESTART will follow).
1: The transfer is not completed after the NBYTES data transfer (NBYTES will be reloaded).
TCR flag is set when NBYTES data are transferred, stretching SCL low.
从上述的资料显示应该不是说要发送停止位
回复:STM32F030的I2C发送数据疑惑 求解答 谢谢
开始我理解的是发送一个NOACK，用来控制I2C总线停止工作做。通过手册，这里控制的是restart信号，可以参考下图中restart产生的信号位置。
回复:STM32F030的I2C发送数据疑惑 求解答 谢谢
这里的I2C_SoftEnd_Mode 是在地址数据发送以后产生一个restart信号，以表示用来读取E2的数据。而在写模式下，不用产生这个restart信号。
开始我理解的是发送一个NOACK，用来控制I2C总线停止工作做。通过手册，这里控制的是restart信号，可以参考下图中restart产生的信号位置。
对的 在地址之后 写不需要START信号。但是我觉得不产生START信号应该是有这句的I2C_No_StartStop设置的；这样下面的配置就可以理解了，I2C_TransferHandling(I2C1,SlaveAddr,WriteLen,I2C_AutoEnd_Mode,I2C_No_StartStop);
开始那个还是有些不明白，看资料一般是超过255字节 才用I2C_Reload_Mode模式。
楼主，你好，可否指导下跨页写？谢谢！
版主，可否指导下跨页写？谢谢
您好，用的哪款芯片。一般是硬件地址上面+2。
我用的就是stm32f030的，已经按照库里面的代码修改的可以跨页读写数据了，谢谢你了。
不客气，要看I2C器件的硬件手册，上面有写。