i2C1 pin remapping

rahul · ‎2008-11-06

Posted on November 07, 2008 at 02:30

i2C1 pin remapping

rahul · ‎2011-05-17

Posted on May 17, 2011 at 12:51

i was trying to remap the i2c1 pins but its not working .

any suggestions ?????????

i have checked in hardware debugging through jtag that afio register does gets modified with i21_remap bit getting set but the communication does not takes place .

However my i2c module starts working fine when i use normal pins without remapping .

rahul · ‎2011-05-17

Posted on May 17, 2011 at 12:51

Here is the code that i am trying out .

void gpio_init ()

{

GPIO_InitTypeDef gpio_initstruct ;

// Remapping of I2C1

RCC_APB2PeriphClockCmd ( RCC_APB2Periph_AFIO , ENABLE ) ;

msdelay ( 5 ) ;

GPIO_PinRemapConfig(GPIO_Remap_I2C1, ENABLE) ;

gpio_initstruct.GPIO_Pin = 0xFC79 ;

gpio_initstruct.GPIO_Speed = GPIO_Speed_50MHz ;

gpio_initstruct.GPIO_Mode = GPIO_Mode_Out_PP ;

GPIO_Init ( GPIOB , &gpio_initstruct ) ;

// I2C pins initialised to alternate function open drain mode

gpio_initstruct.GPIO_Pin = GPIO_Pin_8 | GPIO_Pin_9 ;

// gpio_initstruct.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7 ;

gpio_initstruct.GPIO_Speed = GPIO_Speed_10MHz;

gpio_initstruct.GPIO_Mode = GPIO_Mode_AF_OD;

GPIO_Init (GPIOB, &gpio_initstruct ) ;

gpio_initstruct.GPIO_Pin = 0x0F5F ;

gpio_initstruct.GPIO_Speed = GPIO_Speed_50MHz ;

gpio_initstruct.GPIO_Mode = GPIO_Mode_Out_PP ;

GPIO_Init ( GPIOD , &gpio_initstruct ) ;

}

In the above code if i comment remapping part and initialise pins 6 and 7 instead of pin 8 and 9 for i2c1 then my i2c works fine but on remapping it doesn't .

I am using STM103FRB controller ( 64-pin package) .

rahul · ‎2011-05-17

Posted on May 17, 2011 at 12:51

i wonder if anybody out here has succcessfully used pin remapping .

if yes , then plz do share the things that must be taken care of for this.