I2C配置![]()
将PB6、PB7设置为SCL和SDA引脚（硬件I2C）
OLED.c
void OLED_I2C_SendByte(uint8_t Byte) { HAL_I2C_Master_Transmit(&hi2c1, 0x78, &Byte, 1, HAL_MAX_DELAY); } void OLED_WriteCommand(uint8_t Command) { uint8_t buf[]={0x00, Command}; HAL_I2C_Master_Transmit(&hi2c1, 0x78, buf, 2, HAL_MAX_DELAY); } void OLED_WriteData(uint8_t Data) { uint8_t buf[]={0x40, Data}; HAL_I2C_Master_Transmit(&hi2c1, 0x78, buf, 2, HAL_MAX_DELAY); }将原有的这三个函数替换为上面这些
void OLED_Init(void) { uint32_t i, j; for (i = 0; i < 1000; i++) //上电延时 { for (j = 0; j < 1000; j++); } OLED_WriteCommand(0xAE); //关闭显示 OLED_WriteCommand(0xD5); //设置显示时钟分频比/振荡器频率 OLED_WriteCommand(0x80); OLED_WriteCommand(0xA8); //设置多路复用率 OLED_WriteCommand(0x3F); OLED_WriteCommand(0xD3); //设置显示偏移 OLED_WriteCommand(0x00); OLED_WriteCommand(0x40); //设置显示开始行 OLED_WriteCommand(0xA1); //设置左右方向，0xA1正常 0xA0左右反置 OLED_WriteCommand(0xC8); //设置上下方向，0xC8正常 0xC0上下反置 OLED_WriteCommand(0xDA); //设置COM引脚硬件配置 OLED_WriteCommand(0x12); OLED_WriteCommand(0x81); //设置对比度控制 OLED_WriteCommand(0xCF); OLED_WriteCommand(0xD9); //设置预充电周期 OLED_WriteCommand(0xF1); OLED_WriteCommand(0xDB); //设置VCOMH取消选择级别 OLED_WriteCommand(0x30); OLED_WriteCommand(0xA4); //设置整个显示打开/关闭 OLED_WriteCommand(0xA6); //设置正常/倒转显示 OLED_WriteCommand(0x8D); //设置充电泵 OLED_WriteCommand(0x14); OLED_WriteCommand(0xAF); //开启显示 OLED_Clear(); //OLED清屏 }删除OLED_Init中的I2C初始化代码，I2C和GPIO的初始化已经在cubemx完成。
然后在main.c的MX_I2C1_Init()后面添加OLED_Init()，后续即可正常使用代码中显示数字字符等的函数。
完整的测试main如下（有一些不相关的代码，不用管）
int main(void) { /* USER CODE BEGIN 1 */ int16_t duty=999; uint8_t commands[] = {0x00, 0x8d, 0x14, 0xaf, 0xa5}; /* USER CODE END 1 */ /* MCU Configuration--------------------------------------------------------*/ /* Reset of all peripherals, Initializes the Flash interface and the Systick. */ HAL_Init(); /* USER CODE BEGIN Init */ OLED_Init(); /* USER CODE END Init */ /* Configure the system clock */ SystemClock_Config(); /* USER CODE BEGIN SysInit */ /* USER CODE END SysInit */ /* Initialize all configured peripherals */ MX_GPIO_Init(); //MX_TIM3_Init(); MX_I2C1_Init(); /* USER CODE BEGIN 2 */ OLED_Init(); //HAL_TIM_PWM_Start(&htim3, TIM_CHANNEL_2); //HAL_I2C_Master_Transmit(&hi2c1, 0x78, commands, sizeof(commands)/sizeof(commands[0]), HAL_MAX_DELAY); /* USER CODE END 2 */ /* Infinite loop */ /* USER CODE BEGIN WHILE */ while (1) { /* USER CODE END WHILE */ /* USER CODE BEGIN 3 */ if(duty<0)duty=999; duty-=100; OLED_ShowNum(1,1,duty, 8); //__HAL_TIM_SetCompare(&htim3, TIM_CHANNEL_2, duty); HAL_Delay(500); } /* USER CODE END 3 */ }显示效果如下