STM32硬件I2C调试

调试情况1

现象：主I2C发送数据而没有收到应答，则下一次不能正常发送数据

背景：主I2C每次应该都能正常发送数据

硬件：野火STM32-MINI，1主0从，SCL和SDA直接上拉

软件：按键触发中断，主I2C发送一次数据，中断优先级，按键最低，I2C最高，且主I2C中有TIMEOUT计时

void PB_K2_IRQ_HANDLER(void)
{
    if(EXTI_GetITStatus(PB_K2_EXTILINE) != RESET)
    {
        EXTI_ClearITPendingBit(PB_K2_EXTILINE);
        
        mini_i2c_write(0x22, 0x47);
        LED_D5_TOGGLE;
//        printf("Push button K2 clicked!\r\n");
    }
}

#define PB_PREPRIO                        3
#define PB_SUBPRIO                        3

#define SLAVER_I2C_PRIPRIO                0
#define SLAVER_I2C_SUBPRIO                0

优先级分组均为2

void mini_uart_config(void)
{
    // structure define
    USART_InitTypeDef usart_struct;
    GPIO_InitTypeDef gpio_struct;
    NVIC_InitTypeDef nvic_struct;
    
    // clock enable
    DEBUG_UART_RCC_CMD(DEBUG_UART_RCC, ENABLE);
    GPIO_RCC_CMD(DEBUG_UART_GPIO_RCC, ENABLE);
    
    // GPIO initialization
    gpio_struct.GPIO_Mode = GPIO_Mode_AF_PP;
    gpio_struct.GPIO_Speed = GPIO_Speed_50MHz;
    gpio_struct.GPIO_Pin = DEBUG_UART_TX;
    GPIO_Init(DEBUG_UART_GPIO, &gpio_struct);
    
    gpio_struct.GPIO_Mode = GPIO_Mode_IN_FLOATING;
    gpio_struct.GPIO_Pin = DEBUG_UART_RX;
    GPIO_Init(DEBUG_UART_GPIO, &gpio_struct);
    
    // NVIC    initialization
    NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
    nvic_struct.NVIC_IRQChannel = DEBUG_UART_IRQ;
    nvic_struct.NVIC_IRQChannelPreemptionPriority = DEBUG_UART_PRIPRIO;
    nvic_struct.NVIC_IRQChannelSubPriority = DEBUG_UART_SUBPRIO;
    nvic_struct.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&nvic_struct);
    
    // USART initialization
    usart_struct.USART_Mode = USART_Mode_Tx | USART_Mode_Rx;
    usart_struct.USART_Parity = USART_Parity_No;
    usart_struct.USART_StopBits = USART_StopBits_1;
    usart_struct.USART_WordLength = USART_WordLength_8b;
    usart_struct.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
    usart_struct.USART_BaudRate = DEBUG_UART_BAUDRATE;
    USART_Init(DEBUG_UART, &usart_struct);
    
    USART_Cmd(DEBUG_UART, ENABLE);
    
    USART_ITConfig(DEBUG_UART, USART_IT_RXNE, ENABLE);
}

void mini_i2c_write(uint8_t reg_addr, uint8_t wdata)
{
    uint32_t timeout;
    
    I2C_GenerateSTART(MASTER_I2C, ENABLE);
    timeout = I2C_TIMEOUT;
    while(I2C_CheckEvent(MASTER_I2C, I2C_EVENT_MASTER_MODE_SELECT) == RESET)
    {
        if(timeout-- == 0)
        {
            I2C_GenerateSTOP(MASTER_I2C, ENABLE);
            break;
        }
    }
    
    // device address
    I2C_Send7bitAddress(MASTER_I2C, SLAVER_I2C_OWN_ADDR, I2C_Direction_Transmitter);
    timeout = I2C_TIMEOUT;
    while(I2C_CheckEvent(MASTER_I2C, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED) == RESET)
    {
        if(timeout-- == 0)
        {
            I2C_GenerateSTOP(MASTER_I2C, ENABLE);
            break;
        }
    }
    
    I2C_SendData(MASTER_I2C, reg_addr);
    timeout = I2C_TIMEOUT;
    while(I2C_CheckEvent(MASTER_I2C, I2C_EVENT_MASTER_BYTE_TRANSMITTED) == RESET)
    {
        if(timeout-- == 0)
        {
            I2C_GenerateSTOP(MASTER_I2C, ENABLE);
            break;
        }
    }
    
    I2C_SendData(MASTER_I2C, wdata);
    timeout = I2C_TIMEOUT;
    while(I2C_CheckEvent(MASTER_I2C, I2C_EVENT_MASTER_BYTE_TRANSMITTED) == RESET)
    {
        if(timeout-- == 0)
        {
            I2C_GenerateSTOP(MASTER_I2C, ENABLE);
            break;
        }
    }
    
    I2C_GenerateSTOP(MASTER_I2C, ENABLE);
}

问题所在及解决方案：仍未解决

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