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用STM32F051的I2C從模式做某模塊的控制接口，通過主機讀狀態(tài)和寫控制命令。 Eclips 環(huán)境，gcc編譯器，相關(guān)源碼如下： #ifdef DEBUG_I2C_EN #define DEBUG_I2C(...) printf(__VA_ARGS__) #else #define DEBUG_I2C(...) #endif void I2C_Config(void) { GPIO_InitTypeDef GPIO_InitStructure; I2C_InitTypeDef I2C_InitStructure; NVIC_InitTypeDef NVIC_InitStructure; RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOB, ENABLE); RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1, ENABLE); // I2C port GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz; GPIO_InitStructure.GPIO_OType = GPIO_OType_OD; GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL; GPIO_Init(GPIOB, &GPIO_InitStructure); GPIO_PinAFConfig(GPIOB, GPIO_PinSource6, GPIO_AF_1); GPIO_PinAFConfig(GPIOB, GPIO_PinSource7, GPIO_AF_1); // I2C config I2C_InitStructure.I2C_Timing = 0x00731012; I2C_InitStructure.I2C_AnalogFilter = I2C_AnalogFilter_Enable; I2C_InitStructure.I2C_DigitalFilter = 0x00; I2C_InitStructure.I2C_Mode = I2C_Mode_I2C; I2C_InitStructure.I2C_OwnAddress1 = DEV_SLAVE_ADDR; I2C_InitStructure.I2C_Ack = I2C_Ack_Enable; I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit; I2C_Init(I2C1, &I2C_InitStructure); I2C_Cmd(I2C1, ENABLE); I2C_StretchClockCmd(I2C1, DISABLE); NVIC_InitStructure.NVIC_IRQChannel = I2C1_IRQn; NVIC_InitStructure.NVIC_IRQChannelPriority = 2; // Low Medium Hight VeryHigh: 0 - 3 NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; NVIC_Init(&NVIC_InitStructure); uint32_t temp = I2C_IT_STOPI | I2C_IT_ADDRI | I2C_IT_RXI | I2C_IT_TXI; I2C_ITConfig(I2C1, temp, ENABLE); } static uint8_t Instruct = 0; static uint8_t Offset = 0; static uint8_t MaxBytes = 0; uint8_t *TxBuff; uint8_t RxBuff[40]; void I2C1_IRQHandler(void) { uint8_t temp; uint32_t status = I2C1->ISR; DEBUG_I2C("I2C1->ISR: %08X\n\r", status); if(status & I2C_ISR_ADDR) { // I2C1 Address match event occurs I2C_ClearITPendingBit(I2C1, I2C_ISR_ADDR); if(status & I2C_ISR_DIR) { // I2C1: slave enters transmitter mode. ; } else { // I2C1: slave enters receiver mode. Instruct = 1; } Offset = 0; } else if(status & I2C_ISR_RXNE) { I2C1->ISR |= I2C_ISR_TXE; temp = I2C_ReceiveData(I2C1); if(Instruct) { // Host Instruct switch(temp) { case 0x00: // Get DevInfo TxBuff = (uint8_t *)&DevInfo; // 24 bytes MaxBytes = sizeof(DevInfo); break; case 0x18: // Get DevStatus TxBuff = (uint8_t *)&DevStatus; // 8 bytes MaxBytes = sizeof(DevStatus); break; default: break; } Instruct = 0; } RxBuff[Offset++] = temp; } else if(status & I2C_ISR_TXIS) { I2C1->ISR |= I2C_ISR_TXE; if(Offset < MaxBytes) { I2C_SendData(I2C1, TxBuff[Offset++]); } else { I2C_SendData(I2C1, 0xFF); } } else if(status & I2C_ISR_STOPF) { I2C_ClearITPendingBit(I2C1, I2C_ISR_STOPF); DEBUG_I2C("I2C1 Host stop, Bytes: %d\n\r", Offset); ; // 指令解析 ; } else { I2C_ClearITPendingBit(I2C1, 0x00003F38); printf("I2C1 Unknown event occurs!\n\r"); } } ———————————————— 版權(quán)聲明：本文為CSDN博主「Nerror」的原創(chuàng)文章，遵循 CC 4.0 BY-SA 版權(quán)協(xié)議，轉(zhuǎn)載請附上原文出處鏈接及本聲明。 原文鏈接：https://blog.csdn.net/u010333613/article/details/78262056
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