各位大神求帮助啊！！！！！stm32f0 的i2c问题
可不可以直接用i2c向外面按照协议格式一直发数据，需要有什么方面的配置。为什么我的配置之后只能发送地址信息，然后就结束了。。。。。小白求帮助。/* Includes ------------------------------------------------------------------*/
#include "main.h"
/** @addtogroup Template_Project
* @{
*/
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
static __IO uint32_t TimingDelay;
RCC_ClocksTypeDef RCC_Clocks;
__IO uint16_tsEEAddress = 0x44;
//__IO uint32_tsEETimeout = sEE_LONG_TIMEOUT;
__IO uint16_tsEEDataNum;
__IO uint32_t sEETimeout;
__IO uint32_t sEETrials = 0;
#define sEE_WRITE_ADDRESS1 0x00
#define sEE_READ_ADDRESS1 0x00
#define BUFFER_SIZE1 256
#define BUFFER_SIZE2 256
#define sEE_WRITE_ADDRESS2 (sEE_WRITE_ADDRESS1 + BUFFER_SIZE1)
#define sEE_READ_ADDRESS2 (sEE_READ_ADDRESS1 + BUFFER_SIZE1)
//状态变量
typedef enum {FAILED = 0, PASSED = !FAILED} TestStatus;
/* Private functions ---------------------------------------------------------*/
/**
* @briefMain program.
* @paramNone
* @retval None
*/
void main(void)
{
uint8_t senddata=0xa0;
GPIO_InitTypeDef GPIO_InitStructure;
I2C_InitTypeDef I2C_InitStruct;
// 配置I2C始终资源
RCC_I2CCLKConfig(RCC_I2C1CLK_HSI);
//GPIO使能
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOB, ENABLE);
//IIC使能
RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1, ENABLE);
//GPIO管脚配置
GPIO_PinAFConfig(GPIOB, GPIO_PinSource5, GPIO_AF_1);
GPIO_PinAFConfig(GPIOB, GPIO_PinSource6, GPIO_AF_1);
GPIO_PinAFConfig(GPIOB, GPIO_PinSource7, GPIO_AF_1);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_Level_1;
GPIO_InitStructure.GPIO_OType = GPIO_OType_OD;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(GPIOB,&GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin =GPIO_Pin_7;
GPIO_Init(GPIOB,&GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin =GPIO_Pin_5;
GPIO_Init(GPIOB,&GPIO_InitStructure);
/* I2C configuration */
I2C_InitStruct.I2C_Mode = I2C_Mode_I2C;
I2C_InitStruct.I2C_AnalogFilter = I2C_AnalogFilter_Enable;
I2C_InitStruct.I2C_DigitalFilter = 0x00;
I2C_InitStruct.I2C_OwnAddress1 =0x00;
//I2C_InitStruct.I2C_Ack = I2C_Ack_Enable;
I2C_InitStruct.I2C_Ack = I2C_Ack_Disable;
I2C_InitStruct.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
I2C_InitStruct.I2C_Timing =0x00210507;//100Kbits
I2C_Init(I2C1, &I2C_InitStruct);
//I2C_SMBusAlertCmd(I2C1,ENABLE);
I2C_Cmd(I2C1, ENABLE);
while(1)
{
I2C_TransferHandling(I2C1, sEEAddress, 2, I2C_Reload_Mode, I2C_Generate_Start_Write);
I2C_SendData(I2C1,senddata)；
}
}
/**
* @briefInserts a delay time.
* @paramnTime: specifies the delay time length, in 10 ms.
* @retval None
*/
void Delay(__IO uint32_t nTime)
{
TimingDelay = nTime;
while(TimingDelay != 0);
}
/**
* @briefDecrements the TimingDelay variable.
* @paramNone
* @retval None
*/
void TimingDelay_Decrement(void)
{
if (TimingDelay != 0x00)
{
TimingDelay--;
}
}
/**
* @}
*/
/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
没有指明发送数据的数量 stary666 发表于 2015-4-16 11:10
没有指明发送数据的数量
能不能更加详细一点，谢谢了大哥 我看了库函数就头晕，给你发个我的代码 void
I2C_Master_Transmit(uint8_t DevAddress,
uint8_t eerom_start_address,
const uint8_t * pData,
uint16_t Size
)
{
uint32_t sizetmp;
if ((pData == NULL) || (Size == 0))
{
return;
}
while (__HAL_I2C_GET_FLAG(I2C_ISR_BUSY))
{
}
/* Send Slave Address */
/* Set NBYTES to write and reload if size > I2C_MAX_BYTES and generate RESTART */
/* Size > I2C_MAX_BYTES, need to set RELOAD bit */
if (Size > I2C_MAX_BYTES)
{
I2C_TransferConfig(DevAddress, I2C_MAX_BYTES, I2C_CR2_RELOAD, I2C_GENERATE_START_WRITE);
sizetmp = I2C_MAX_BYTES;
}
else
{
I2C_TransferConfig(DevAddress, Size, I2C_CR2_AUTOEND, I2C_GENERATE_START_WRITE);
sizetmp = Size;
}
while (!__HAL_I2C_GET_FLAG(I2C_ISR_TXIS))
{
}
I2C_CHANNEL->TXDR = eerom_start_address;
while ((Size - 1) > 0)
{
/* Wait until TXIS flag is set */
while (!__HAL_I2C_GET_FLAG(I2C_ISR_TXIS))
{
}
/* Write data to TXDR */
I2C_CHANNEL->TXDR = (uint32_t)*pData;
pData++;
sizetmp--;
Size--;
if ((sizetmp == 0) && (Size != 0))
{
/* Wait until TXE flag is set */
while (!__HAL_I2C_GET_FLAG(I2C_ISR_TCR))
{
}
if (Size > I2C_MAX_BYTES)
{
I2C_TransferConfig(DevAddress, I2C_MAX_BYTES, I2C_CR2_RELOAD, I2C_NO_STARTSTOP);
sizetmp = I2C_MAX_BYTES;
}
else
{
I2C_TransferConfig(DevAddress, Size, I2C_CR2_AUTOEND, I2C_NO_STARTSTOP);
sizetmp = Size;
}
}
}
/* No need to Check TC flag, with AUTOEND mode the stop is automatically generated */
/* Wait until STOPF flag is set */
while (!__HAL_I2C_GET_FLAG(I2C_ISR_STOPF))
{
}
/* Clear STOP Flag */
__HAL_I2C_CLEAR_FLAG(I2C_ISR_STOPF);
/* Clear Configuration Register 2 */
__HAL_I2C_RESET_CR2();
} void
I2C_TransferConfig(uint8_tDevAddress,
uint16_t Size,
uint32_t Mode,
uint32_t Request
)
{
/* clear tmpreg specific bits */
I2C_CHANNEL->CR2 &= (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 */
#if I2C_ADDRESSINGMODE_7BIT
I2C_CHANNEL->CR2 |= (uint32_t)(((uint32_t)(DevAddress << 1) & I2C_CR2_SADD) \
| (((uint32_t)Size << 16) & I2C_CR2_NBYTES) \
| (uint32_t)Mode | (uint32_t)Request);
#else
I2C_CHANNEL->CR2 |= (uint32_t)(((uint32_t)DevAddress & I2C_CR2_SADD) \
| (((uint32_t)Size << 16) & I2C_CR2_NBYTES) \
| (uint32_t)Mode | (uint32_t)Request);
#endif
} 你参考看看 stary666 发表于 2015-4-16 11:26
void
I2C_Master_Transmit(uint8_t DevAddress,
uint8_t eerom_start ...
谢谢了，我研究研究 stary666 发表于 2015-4-16 11:26
void
I2C_Master_Transmit(uint8_t DevAddress,
uint8_t eerom_start ...
大神，我还想请教你个问题，就是如果我只将stm板子，作为主机，不给其链接从设备，那样就没有反馈的ack信号，那么在地址信息发出之后主机没有得到ack那么他就不会再向从设备发送数据信息，如何通过软件的形式给主机提供反馈的ack信号？大神在帮帮忙 你的I2C定义那里把应答关掉了，没了应答，怎么连续发数据？