- /**
- * [url=home.php?mod=space&uid=247401]@brief[/url] Configures I2C Device port.
- * @param ulSpeed I2C baudrate.
- * @retval None
- */
- static void Config_I2cDevice ( uint32_t ulSpeed )
- {
- GPIO_InitTypeDef xGPIO_InitStruct;
- I2C_InitTypeDef xI2C_InitStruct;
-
- /* Enable clock. */
- RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOB, ENABLE );
- RCC_APB1PeriphClockCmd( RCC_APB1Periph_I2C1, ENABLE );
-
- /* Configure scl & sda GPIO parameters. */
- xGPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF_OD;
- xGPIO_InitStruct.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7;
- xGPIO_InitStruct.GPIO_Speed = GPIO_Speed_10MHz;
- GPIO_Init( GPIOB, &xGPIO_InitStruct );
-
- /* Configure I2C parameters. */
- xI2C_InitStruct.I2C_ClockSpeed = ulSpeed;
- xI2C_InitStruct.I2C_Mode = I2C_Mode_MASTER;
- xI2C_InitStruct.I2C_OwnAddress = 0x0;
- if ( ulSpeed <= 100000 ) { /* Configure speed in standard mode */
- xI2C_InitStruct.I2C_Speed = I2C_Speed_STANDARD;
- } else { /* Configure speed in fast mode */
- xI2C_InitStruct.I2C_Speed = I2C_Speed_FAST;
- }
- I2C_Init( I2C1, &xI2C_InitStruct );
-
- /* Enable i2c1 port. */
- I2C_Cmd( I2C1, ENABLE );
- }
（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;
- }
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 - /**
- * @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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