Busy flag Set in I2C

[pranathi1091]

Posted on November 29, 2012 at 06:22

The original post was too long to process during our migration. Please click on the attachment to read the original post.

[pranathi1091]

Posted on November 30, 2012 at 06:35

YEs i have changed the GPIO configurations

If i probe he SCL line its always high

I have no clue whats happening

void RCC_Configuration(void).

Here is my clock and GPIO code

Pls let me know where am i wrong

{

 RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);

  RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1, ENABLE);

}

void I2C_Config(void)

{

GPIO_InitTypeDef GPIO_InitStruct;

I2C_InitTypeDef  I2C_InitStruct;

GPIO_InitStruct.GPIO_OType = GPIO_OType_OD;

GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_UP;

GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF;

GPIO_InitStruct.GPIO_Pin =TEMP_I2c_SDA;

GPIO_InitStruct.GPIO_Speed = GPIO_Speed_100MHz;           

GPIO_Init(GPIOB, &GPIO_InitStruct);

GPIO_PinAFConfig(GPIOB,GPIO_PinSource7,GPIO_AF_I2C1);

GPIO_InitStruct.GPIO_OType = GPIO_OType_OD;

GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_UP;

GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF;

GPIO_InitStruct.GPIO_Pin =TEMP_I2C_SCL;

GPIO_InitStruct.GPIO_Speed = GPIO_Speed_100MHz;            

GPIO_Init(GPIOB, &GPIO_InitStruct);

GPIO_PinAFConfig(GPIOB,GPIO_PinSource6,GPIO_AF_I2C1);

I2C_InitStruct.I2C_ClockSpeed=2000000;

I2C_InitStruct.I2C_Mode=I2C_Mode_I2C;

I2C_InitStruct.I2C_DutyCycle=I2C_DutyCycle_2;

I2C_InitStruct.I2C_OwnAddress1=0x00;

I2C_InitStruct.I2C_Ack=I2C_Ack_Enable;

I2C_InitStruct.I2C_AcknowledgedAddress=I2C_AcknowledgedAddress_7bit;

I2C_Init(I2C1,&I2C_InitStruct);

I2C_Cmd(I2C1,ENABLE);

}

[Tesla DeLorean]

Posted on November 30, 2012 at 11:50

GPIO_InitStruct.GPIO_Pin =TEMP_I2c_SDA; // Check definition, you explicitly call out the AF pin

..

GPIO_InitStruct.GPIO_Pin =TEMP_I2C_SCL;

..

I2C_InitStruct.I2C_ClockSpeed=2000000; // 2 MHz ???

Otherwise initialization looks reasonable.

[pranathi1091]

Posted on November 30, 2012 at 11:59

Thanks Clive.

You mean to say i have to use GPIO_AF_I2C1. Currently I have defined SCL as GPIO_Pin_6 and GPIO_Pin_7 as SDA.i

I have changed the frequency to 100kHz(standard mode)

And these are the values i could see when i debug in I2C registers

CR1->0x00000401(PE bit is set, ACK bit is set)

CR2->0x0000001E(Freq is set with this value)

OAR1->0x00004000(ADD is 0x00)

OAR2->0x0000000(ADD2 is 0x00)

DAR will be written with the data i send

SR1 is 0

SR2->0x00000002 Busy bit is set

CCR->0x00000096

TRISE->0x0000001F

[Tesla DeLorean]

Posted on November 30, 2012 at 12:30

Try enabling before initializing.

I2C_Cmd(I2C1,ENABLE);

I2C_Init(I2C1,&I2C_InitStruct);

[pranathi1091]

Posted on November 30, 2012 at 12:49

No change

I get this Flag always busy  I2C_FLAG_BUSY

[pranathi1091]

Posted on November 30, 2012 at 12:50

No change

I get this Flag always busy  I2C_FLAG_BUSY

[Nickname12657_O]

Posted on December 07, 2012 at 11:32

Hi,

Try to reset the I2C after enabling its clock:

 /* Reset I2C1 IP */

  RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C1, ENABLE);

 /* Release reset signal of I2C1 IP */

  RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C1, DISABLE);

Let me know the result.

Cheers,

STOne-32

 

[shivasankarg]

Posted on November 25, 2015 at 22:23

Hi,

I am facing the same problem. i'm betting an ACK failure after sending the slave address. So I am not sure what the problem is. I have attached a screenshot of the data being transmitted when viewed on a logic analyzer. Please help.

[Gutierrez.Guillermo]

Posted on February 29, 2016 at 20:50

Hi, maybe it is a little old thread but i was having the same problems with the start getting stuck. What i did to fix was to enable the i2c clock AFTER i  call GPIO_PinAFConfig() because seems to be there is a glitch that makes the i2C module to stay with the BUSY bit on when you enable first the clocks.

Hopefully it helps somebody struggling as i was