I2C 的装备
staTIc void IniTI2C()
{
I2C_InitTypeDef I2C_InitStructure;
GPIO_InitTypeDef GPIO_InitA;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1,ENABLE);//使能I2C1,I2C2的时钟
RCC_I2CCLKConfig(RCC_I2C1CLK_SYSCLK);//时钟源设定
GPIO_PinAFConfig(GPIOB, GPIO_PinSource8, GPIO_AF_1); //装备PB8 成第二功用引脚 I2C1_SCL
GPIO_PinAFConfig(GPIOB, GPIO_PinSource9, GPIO_AF_1); //装备PB9 成第二功用引脚 I2C1_SDA
GPIO_InitA.GPIO_Pin = GPIO_Pin_8 | GPIO_Pin_9;
GPIO_InitA.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitA.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitA.GPIO_OType = GPIO_OType_PP;
GPIO_InitA.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_Init(GPIOB, &GPIO_InitA);
I2C_InitStructure.I2C_Mode = I2C_Mode_SMBusHost;
I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
I2C_InitStructure.I2C_AnalogFilter = I2C_AnalogFilter_Enable;
I2C_InitStructure.I2C_DigitalFilter = 0x01;
I2C_InitStructure.I2C_OwnAddress1 = 0x00;
I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
I2C_InitStructure.I2C_TIming = 0x0090174F;
I2C_Init(I2C1, &I2C_InitStructure);
I2C_Cmd(I2C1, ENABLE);
}
相同的装备计划,I2C_TIming的意思请移步本博客GY30那篇文章。
I2C引脚为PB8 与PB9(运用的C8T6,f4p6可以用PA的)
#define AT24C16_Base_Address 0xA0
void AT24C16_WriteByte(uint8_t Page,uint8_t WordAddress,uint8_t Data);
uint8_t AT24C16_ReadByte(uint8_t Page,uint8_t WordAddress);
void AT24C16_PageWrite(uint8_t Page,uint8_t WordAddress,uint8_t Length,uint8_t* Data);
void AT24C16_SequentialRead(uint8_t Page,uint8_t WordAddress, uint8_t length , uint8_t* p);
下面是相关函数:
void AT24C16_WriteByte(uint8_t Page,uint8_t WordAddress,uint8_t Data)
{
if(WordAddress > 0x10)
{
return;
}
WordAddress |= ( Page & 0x0F ) << 4;
while(I2C_GetFlagStatus(I2C1, I2C_FLAG_BUSY) != RESET);//IF BUSY
I2C_TransferHandling(I2C1,AT24C16_Base_Address | ( ( Page & 0xF0 ) >> 3 ),2,I2C_AutoEnd_Mode,I2C_Generate_Start_Write);
while(I2C_GetFlagStatus(I2C1, I2C_FLAG_TXIS) == RESET);//If Write OK
I2C_SendData(I2C1,WordAddress);
while(I2C_GetFlagStatus(I2C1, I2C_FLAG_TXIS) == RESET);//If Write OK
I2C_SendData(I2C1,Data);
while(I2C_GetFlagStatus(I2C1, I2C_FLAG_STOPF) == RESET);
}
uint8_t AT24C16_ReadByte(uint8_t Page,uint8_t WordAddress)
{
uint8_t Recev = 0x00;
if(WordAddress > 0x10)
{
return 0;
}
WordAddress |= ( Page & 0x0F ) << 4;
while(I2C_GetFlagStatus(I2C1, I2C_FLAG_BUSY) != RESET);//IF BUSY
I2C_TransferHandling(I2C1,AT24C16_Base_Address | ( ( Page & 0xF0 ) >> 3 ),1,I2C_SoftEnd_Mode,I2C_Generate_Start_Write);
while(I2C_GetFlagStatus(I2C1, I2C_FLAG_TXIS) == RESET);//If Write OK
I2C_SendData(I2C1,WordAddress);
while(I2C_GetFlagStatus(I2C1, I2C_FLAG_TC) == RESET);
I2C_TransferHandling(I2C1,AT24C16_Base_Address | ( ( Page & 0xF0 ) >> 3 ),1,I2C_AutoEnd_Mode,I2C_Generate_Start_Read);
while(I2C_GetFlagStatus(I2C1, I2C_FLAG_RXNE) == RESET);
Recev = I2C_ReceiveData(I2C1);
while(I2C_GetFlagStatus(I2C1, I2C_FLAG_STOPF) == RESET);
return Recev;
}
下面是页读取,页写入:
void AT24C16_PageWrite(uint8_t Page,uint8_t WordAddress,uint8_t Length,uint8_t* Data)
{
uint8_t i = 0;
if(WordAddress > 0x10)
{
return;
}
WordAddress |= ( Page & 0x0F ) << 4;
while(I2C_GetFlagStatus(I2C1, I2C_FLAG_BUSY) != RESET);//IF BUSY
I2C_TransferHandling(I2C1,AT24C16_Base_Address | ( ( Page & 0xF0 ) >> 3 ),Length + 1,I2C_AutoEnd_Mode,I2C_Generate_Start_Write);
while(I2C_GetFlagStatus(I2C1, I2C_FLAG_TXIS) == RESET);//If Write OK
I2C_SendData(I2C1,WordAddress);
for(i = 0;i < Length; i++)
{
while(I2C_GetFlagStatus(I2C1, I2C_FLAG_TXIS) == RESET);//If Write OK
I2C_SendData(I2C1,Data[i]);
}
while(I2C_GetFlagStatus(I2C1, I2C_FLAG_STOPF) == RESET);
}
void AT24C16_SequentialRead(uint8_t Page,uint8_t WordAddress, uint8_t length , uint8_t* p)
{
uint8_t i;
if(WordAddress > 0x10)
{
return;
}
WordAddress |= ( Page & 0x0F ) << 4;
while(I2C_GetFlagStatus(I2C1, I2C_FLAG_BUSY) != RESET);//IF BUSY
I2C_TransferHandling(I2C1,AT24C16_Base_Address | ( ( Page & 0xF0 ) >> 3 ),1,I2C_SoftEnd_Mode,I2C_Generate_Start_Write);
while(I2C_GetFlagStatus(I2C1, I2C_FLAG_TXIS) == RESET);//If Write OK
I2C_SendData(I2C1,WordAddress);
while(I2C_GetFlagStatus(I2C1, I2C_FLAG_TC) == RESET);
I2C_TransferHandling(I2C1,AT24C16_Base_Address | ( ( Page & 0xF0 ) >> 3 ),length,I2C_AutoEnd_Mode,I2C_Generate_Start_Read);
for(i = 0;i < length;i++)
{
while(I2C_GetFlagStatus(I2C1, I2C_FLAG_RXNE) == RESET);
p[i] = I2C_ReceiveData(I2C1);
}
while(I2C_GetFlagStatus(I2C1, I2C_FLAG_STOPF) == RESET);
}
感觉没什么说的,GY30那篇文章根本都说完了,添点小知识点吧。
I2C_AutoEnd_Mode,望文生义,操作length字节后主动增加STOP。
I2C_SoftEnd_Mode ,相同望文生义,操作length字节后需求手动增加STOP。( I2C_GenerateSTOP() )
这个形式比主动多了一步,需求 I2C_GetFlagStatus(I2C1, I2C_FLAG_TC) ,Translate Completed,是否传输完结,主动形式下拜访这个会得到Reset值,但是手动形式下需求拜访他,然后生成Stop。
然后……差不多了吧?举个 上面网址的比如吧,我觉得很多人不会看……
所以在编写程序对AT24C16第100页的第3个字节进行写数据的时分,过程如下:
1)发送起始信号;
2)发送器材地址0XA6(1010 0110,1010是固定地址,011是页地址的高三位,0表明写操作);
3)发送操作地址0X43(0100 0011,0100是页地址的低四位,0011是页地址偏移量,即第100页内的第三个字节,
4)发送要写的数据,
5)发送停止信号。
我信任各位最起码都看了AT24C16的地址了,0xA0。(再次引证畅学电子网的图片)
P0P1P2为页地址高三位,发送的字地址(WordAddress)高四位为页地址的第四位,低四位为字地址。
AT24C16有128页,每页16bytes。所以正好匹配上。
写的距离至少为5ms,否则用循环等候的话I2C会卡死。
以上。