I2C1 卡死在 RXNE 旗標（0x40）

paul_chu 提问时间：2013-3-5 14:36 /

我們目前正開發 STM32的應用
觸控元件為 STMPE610
PB5_I2C1_nINT0 連接 STMPE610 的INT接腳
PB6_I2C1_SCL 連接 STMPE610 的SCLK接腳
PB7_I2C1_SDA 連接 STMPE610 的 SDAT接腳

<div style="margin: 0px; padding: 0px; border: 0px; vertical-align: baseline; color: rgb(34, 34, 34); font-family: Arial, Helvetica, sans-serif; font-size: 13px;">初始化後，我們嘗試透過 I2C 去讀 STMPE610的暫存器，竟然卡住：
>

I2C_AcknowledgeConfig(I2C1, ENABLE);

while (I2C_GetFlagStatus(I2C1,I2C_FLAG_BUSY));

I2C_GenerateSTART(I2C1, ENABLE);
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT)); SR1 = 0x40 (I2C_FLAG_RXNE), I2C1->SR2 = 0

我們查到在stackOverflow也有人遇到類似的問題，但不知如何解：
http://stackoverflow.com/questions/2556794/stm32-i2c1-start-bit-not-set-on-sr1-register

初始化的程式碼：

RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);

GPIO_InitTypeDef GPIO_InitStructure;

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz; //
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
GPIO_Init(GPIOB, &GPIO_InitStructure);

NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);

NVIC_InitStructure.NVIC_IRQChannel = EXTI9_5_IRQn; //EXTI9_5_IRQn; // EXTI Line[9:5] Interrupts
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);

EXTI_InitSturcture.EXTI_Line = EXTI_Line5 ;
EXTI_InitSturcture.EXTI_Mode = EXTI_Mode_Interrupt ;
EXTI_InitSturcture.EXTI_Trigger = EXTI_Trigger_Falling;
EXTI_InitSturcture.EXTI_LineCmd = ENABLE;
EXTI_Init(&EXTI_InitSturcture);

// Select PB5 as EXTI Line 5
GPIO_EXTILineConfig(GPIO_PortSourceGPIOB, GPIO_PinSource5);

GPIO_InitTypeDef GPIO_InitStructure;

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_OD;
GPIO_Init(GPIOB, &GPIO_InitStructure);

I2C_InitTypeDef I2C_InitStructure;

I2C_DeInit(I2C1);
I2C_SoftwareResetCmd(I2C1, ENABLE);
I2C_SoftwareResetCmd(I2C1, DISABLE);

I2C_Cmd(I2C1, ENABLE);

I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;
I2C_InitStructure.I2C_OwnAddress1 = 0x00;
I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit ;
I2C_InitStructure.I2C_ClockSpeed = 50000;
I2C_Init(I2C1, &I2C_InitStructure);

I2C_ITConfig(I2C1, I2C_IT_BUF | I2C_IT_EVT, ENABLE);

請各位大大提供建議，謝謝！！