2、I2C 硬件驱动
（a）、 根据官方提供源码修改，并且将其封装在 HAL_i2c 库文件内；
（b）、 该OLED 仅需要 写操作;
（c）、 在发送 STOP 停止信号前需延时 5us 才能正常显示（后续再找原因）。
/**
* @brief Writes buffer of data to the I2C EEPROM.
* @param pxIO ：typedef struct { GPIO_TypeDef* xPort; uint16_t usScl; uint16_t usSda; }I2C_GPIO_t;
* @param pBuffer : pointer to the buffer containing the data to be written
* to the EEPROM.
* @param WriteAddr : EEPROM's internal address to write to.
* @param NumByteToWrite : number of bytes to write to the EEPROM.
* @retval None
*/
ErrorStatus I2C_WriteBuffer( const I2C_GPIO_t* pxIO, I2C_TypeDef* I2Cx, uint8_t DeviceAddr, uint8_t WriteAddr, uint16_t NumByteToWrite, uint8_t* pBuffer)
{
uint32_t I2C_Timeout;
uint16_t write_Num;
GPIO_InitTypeDef xGPIO_InitStruct;
xGPIO_InitStruct.GPIO_Pin = pxIO->usScl | pxIO->usSda;
xGPIO_InitStruct.GPIO_Speed = GPIO_Speed_10MHz;
xGPIO_InitStruct.GPIO_Mode = GPIO_Mode_IPU;
GPIO_Init( pxIO->xPort, &xGPIO_InitStruct );
I2C_Cmd(I2Cx, DISABLE);
I2C_Send7bitAddress( I2Cx, DeviceAddr, I2C_Direction_Transmitter );
I2C_Cmd(I2Cx, ENABLE);
xGPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF_OD;
GPIO_Init( pxIO->xPort, &xGPIO_InitStruct );
I2C_SendData( I2Cx, WriteAddr );
I2C_Timeout = 0x1000;
while ( ( I2C_GetFlagStatus( I2Cx, I2C_STATUS_FLAG_TFE ) ) == RESET ) {
if ( ( I2C_Timeout-- ) == 0 ) {
return ERROR;
}
}
for ( write_Num=0; write_Num<NumByteToWrite; write_Num++ ) {
I2C_Timeout = 0x1000;
while ( ( I2C_GetFlagStatus( I2Cx, I2C_STATUS_FLAG_TFE ) ) == RESET ) {
if ( ( I2C_Timeout-- ) == 0 ) {
return ERROR;
}
}
I2C_SendData( I2Cx, *( pBuffer + write_Num ) );
}
/* 96MHz 工作频率下，延时5us. */
for ( uint16_t i=480; i>0; i-- );
I2C_GenerateSTOP( I2Cx, ENABLE );
I2C_Timeout = 0x1000;
while ( ( I2C_GetITStatus( I2Cx, I2C_IT_STOP_DET ) ) == RESET ) {
if ( ( I2C_Timeout-- ) == 0 ) {
return ERROR;
}
}
/* If all operations OK, return sEE_OK (0) */
return SUCCESS;
}
3、OLED 程序模块
仅提供 Cmd & Data 部分，大部分和网络上的大同小异，可参考（正点原子、中景园电子、etc）。这篇**主要是 MM32 的 I2C，完整驱动代码下载链接在文末。
/**
* @brief Write commands to the screen.
* @param ucCmd Write command to be written.
* @retval None.
*/
static void Screen_WriteCmd( uint8_t ucCmd )
{
I2C_WriteBuffer( &xConfig, I2C_DEVICE, I2C_ADDR, 0x00, 1, &ucCmd );
}
/**
* @brief Write data to the screen.
* @param ucCmd Write data to be written.
* @retval None.
*/
static void Screen_WriteDat( uint8_t ucDat )
{
I2C_WriteBuffer( &xConfig, I2C_DEVICE, I2C_ADDR, 0x40, 1, &ucDat );
}
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