本帖最后由 swortering 于 2017-8-28 22:12 编辑
源代码为野火开发板提供的
uint32_t I2C_EE_BufferRead(u8* pBuffer, u8 ReadAddr, u16 NumByteToRead)
{
I2CTimeout = I2CT_LONG_TIMEOUT;
//*((u8 *)0x4001080c) |=0x80;
while(I2C_GetFlagStatus(EEPROM_I2Cx, I2C_FLAG_BUSY))
{
if((I2CTimeout--) == 0) return I2C_TIMEOUT_UserCallback(9);
}
/* Send START condition */
I2C_GenerateSTART(EEPROM_I2Cx, ENABLE);
//*((u8 *)0x4001080c) &=~0x80;
I2CTimeout = I2CT_FLAG_TIMEOUT;
/* Test on EV5 and clear it */
while(!I2C_CheckEvent(EEPROM_I2Cx, I2C_EVENT_MASTER_MODE_SELECT))
{
if((I2CTimeout--) == 0) return I2C_TIMEOUT_UserCallback(10);
}
/* Send EEPROM address for write */
I2C_Send7bitAddress(EEPROM_I2Cx, EEPROM_ADDRESS, I2C_Direction_Transmitter);
I2CTimeout = I2CT_FLAG_TIMEOUT;
/* Test on EV6 and clear it */
while(!I2C_CheckEvent(EEPROM_I2Cx, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED))
{
if((I2CTimeout--) == 0) return I2C_TIMEOUT_UserCallback(11);
}
/* Clear EV6 by setting again the PE bit */
I2C_Cmd(EEPROM_I2Cx, ENABLE); /* 为什么需要重新使能一下模块 */
/* Send the EEPROM's internal address to write to */
I2C_SendData(EEPROM_I2Cx, ReadAddr);
I2CTimeout = I2CT_FLAG_TIMEOUT;
/* Test on EV8 and clear it */
while(!I2C_CheckEvent(EEPROM_I2Cx, I2C_EVENT_MASTER_BYTE_TRANSMITTED))
{
if((I2CTimeout--) == 0) return I2C_TIMEOUT_UserCallback(12);
}
/* Send STRAT condition a second time */
I2C_GenerateSTART(EEPROM_I2Cx, ENABLE);
I2CTimeout = I2CT_FLAG_TIMEOUT;
/* Test on EV5 and clear it */
while(!I2C_CheckEvent(EEPROM_I2Cx, I2C_EVENT_MASTER_MODE_SELECT))
{
if((I2CTimeout--) == 0) return I2C_TIMEOUT_UserCallback(13);
}
/* Send EEPROM address for read */
I2C_Send7bitAddress(EEPROM_I2Cx, EEPROM_ADDRESS, I2C_Direction_Receiver);
I2CTimeout = I2CT_FLAG_TIMEOUT;
/* Test on EV6 and clear it */
while(!I2C_CheckEvent(EEPROM_I2Cx, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED))
{
if((I2CTimeout--) == 0) return I2C_TIMEOUT_UserCallback(14);
}
/* While there is data to be read */
while(NumByteToRead)
{
if(NumByteToRead == 1)
{
/* Disable Acknowledgement */
I2C_AcknowledgeConfig(EEPROM_I2Cx, DISABLE);
/* Send STOP Condition */
I2C_GenerateSTOP(EEPROM_I2Cx, ENABLE);
}
/* Test on EV7 and clear it */
I2CTimeout = I2CT_LONG_TIMEOUT;
while(I2C_CheckEvent(EEPROM_I2Cx, I2C_EVENT_MASTER_BYTE_RECEIVED)==0)
{
if((I2CTimeout--) == 0) return I2C_TIMEOUT_UserCallback(3);
}
{
/* Read a byte from the EEPROM */
*pBuffer = I2C_ReceiveData(EEPROM_I2Cx);
/* Point to the next location where the byte read will be saved */
pBuffer++;
/* Decrement the read bytes counter */
NumByteToRead--;
}
}
/* Enable Acknowledgement to be ready for another reception */
I2C_AcknowledgeConfig(EEPROM_I2Cx, ENABLE);
return 1;
}
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采用设置PE的方式来,清除EV6
因为有些寄存器是写1清零,所以这里要使能一次
你不能指望每个人都学过英语,有些人能区分abc就很不错了
2R+1G=橙 {MOD}
楼主说这是红 {MOD},说明他识别不了绿 {MOD}
所以楼主是绿 {MOD} {MOD}盲,鉴定完毕
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