Resolved! After LL_I2C_TransmitData8 the TXE flag keeps 0
I'm using STM32F103RBT6 to connetc to a OLED with I2C1.The init code is as below.static void MX_I2C1_Init(void) { /* USER CODE BEGIN I2C1_Init 0 */ /* USER CODE END I2C1_Init 0 */ LL_I2C_InitTypeDef I2C_InitStruct = {0}; LL_GPIO_Init...