I2C Busy Flag problem

sukrubahadirarslan · ‎2013-12-21

Posted on December 21, 2013 at 13:35

hello.

I want to write byte to the sensör with I2C so write this code

void MPU6050_I2C_Init()

{

// RCC Configuration

RCC_HCLKConfig(RCC_SYSCLK_Div2);

RCC_PCLK1Config(RCC_HCLK_Div1);

RCC_PCLK2Config(RCC_HCLK_Div1);

RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1,ENABLE);

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB,ENABLE);

// GPIO Configuration

GPIO_Config_Anahtari.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7;

GPIO_Config_Anahtari.GPIO_Mode = GPIO_Mode_AF_OD;

GPIO_Config_Anahtari.GPIO_Speed = GPIO_Speed_2MHz;

GPIO_Init(GPIOB,&GPIO_Config_Anahtari);

GPIO_PinRemapConfig(GPIO_Remap_I2C1,ENABLE);

// I2C Configuration

I2C_Config_Anahtari.I2C_Mode = I2C_Mode_I2C;

I2C_Config_Anahtari.I2C_ClockSpeed = 400000;

I2C_Config_Anahtari.I2C_DutyCycle = I2C_DutyCycle_2;

I2C_Config_Anahtari.I2C_Ack = ENABLE;

I2C_Config_Anahtari.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;

I2C_Config_Anahtari.I2C_OwnAddress1 = 0x10;

I2C_Init(I2C1,&I2C_Config_Anahtari);

I2C_Cmd(I2C1,ENABLE);

}

void I2C_MonitorAndClear_ADDR()

{

while(I2C_GetFlagStatus(I2C1,I2C_FLAG_ADDR)==RESET);

I2C_ReadRegister(I2C1,I2C_Register_SR1);

I2C_ReadRegister(I2C1,I2C_Register_SR2);

}

void I2C_Clear_SB_Monitor_MSL()

{

I2C_ReadRegister(I2C1,I2C_Register_SR1);

while(I2C_GetFlagStatus(I2C1,I2C_FLAG_MSL)==RESET);

}

void MPU6050_SingleByte_Write(uint8_t register_address,uint8_t data)

{

while(I2C_GetFlagStatus(I2C1,I2C_FLAG_BUSY)==SET);

I2C_GenerateSTART(I2C1,ENABLE);

I2C_Clear_SB_Monitor_MSL();

I2C_Send7bitAddress(I2C1,MPU6050_Default_Address,I2C_Direction_Transmitter);

I2C_MonitorAndClear_ADDR();

while(I2C_GetFlagStatus(I2C1,I2C_FLAG_TRA)==RESET);

I2C_SendData(I2C1,register_address);

while(I2C_GetFlagStatus(I2C1,I2C_FLAG_TXE)==RESET);

I2C_SendData(I2C1,data);

while(I2C_GetFlagStatus(I2C1,I2C_FLAG_BTF)==RESET);

I2C_GenerateSTOP(I2C1,ENABLE);

}

here is my functions . In RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1,ENABLE); line , BUSY flag is set and never reset. So code hangs in here. When I reset the I2C1 periph clock with RCC_APB2PeriphResetCmd command , busy flag is reset but I can't configure the I2C interface after reset cmd. So what is the problem ?

thanks for your answer.

Tesla DeLorean · ‎2013-12-21

Posted on December 21, 2013 at 15:44

The ReMap would require the AFIO clock enabled.

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sukrubahadirarslan · ‎2013-12-21

Posted on December 21, 2013 at 21:23

İt does not work.

I don't change anythink in code or in board , but when I try again , It work . I don't understand why.

Now I have a another problem.

I am using MPU6050 sensor. And when I send the address of sensor , no-acknowledgment bit coming from sensör. I cant find the problem . Can you help me in this issue ?

thanks

Tesla DeLorean · ‎2013-12-21

Posted on December 21, 2013 at 22:27

Can you help me in this issue ?

Not much I suppose.

So, what address are you sending? Can you see the transaction on a scope?

I'd supposed it would use address 0xD0 or 0xD2 depending on the part strapping. Make sure it is strapped for I2C operation, and what address you expect.

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sukrubahadirarslan · ‎2013-12-21

Posted on December 21, 2013 at 23:34

*In sensör datasheet, default sensör address is 0x68 so I send the sensör 0x68 for addressing.

* I dont observe SCL and SDA signal in scope.

Can I use Keil for observe this signal ?

I mean I saw logic analyzer in keil but I dont know how to use it ?

Can I use logic analyzer for analyze SCL and SDA signal ?

Tesla DeLorean · ‎2013-12-21

Posted on December 22, 2013 at 01:57

No, I really think you're misinterpreting the data sheets wrt 7-bit addressing.

0x68 << 1 = 0xD0

The lack of an ACK indicates the part doesn't recognize the presented address.

Try 0xD0

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sukrubahadirarslan · ‎2013-12-22

Posted on December 22, 2013 at 12:05

I try 0xD0 . I dont receive nack bit, but this time ADDR bit is not set.Program hangs in

while(I2C_CheckEvent(I2C1,I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED)==ERROR); . So I dont understand what is the problem. I dont have any solution. Why ADDR bit is not set ?

thanks

sukrubahadirarslan · ‎2013-12-22

Posted on December 22, 2013 at 12:26

Now I try 0xD0 . but in debug mode I change breakout point location .

here is my screen.

When I insert breakout point like this, program not hangs in

while(I2C_CheckEvent(I2C1,I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED)==ERROR); line. But I insert breakout point like this(below picture) , And step one line usin F11 , program hangs in while(I2C_CheckEvent(I2C1,I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED)==ERROR); line.

So can you interpret this situation ?

thanks again

Posted: Sunday, December 22, 2013 12:05 PM

Subject: I2C Busy Flag problem

I try 0xD0 . I dont receive nack bit, but this time ADDR bit is not set.Program hangs in

while(I2C_CheckEvent(I2C1,I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED)==ERROR); . So I dont understand what is the problem. I dont have any solution. Why ADDR bit is not set ?

thanks