Busy flag Set in I2C

[pranathi1091]

Posted on November 29, 2012 at 06:22The original post was too long to process during our migration. Please click on the attachment to read the original post.

[Tesla DeLorean]

Posted on November 29, 2012 at 15:58

Did you fix the pin driver issue?

You can read the GPIO pin state using registers. You can tri-state the pin, and let the external 4K7 resistor pull up the lines. If it is not going high, then and external device on the bus is driving/clamping it low. Probe the circuit figure out which. You can clock confused I2C slave devices by driving the SCL manually, most slaves don't have an async reset, so if they get in odd states you must clock them out.

[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