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problem with pin configuration in STM8L-Discovery (broken pin?)

Question asked by inler on Nov 16, 2011
I configured the PC4 and PC7 ports both as inputs:

GPIO_Init(GPIOC, GPIO_Pin_7, GPIO_Mode_In_FL_No_IT);
GPIO_Init(GPIOC, GPIO_Pin_4, GPIO_Mode_In_FL_No_IT);

I would like to use these two pins with the ADC (channel 3 and 4 respectively) showing the voltage value on the on-board LCD. If I setup a program to do this with PC7 all behaves normally. If I do the same for PC4 when I apply a (constant) signal (say 0 V) the LCD goes mad and the program appears to reset.
Checking with a scope PC4 is stuck to 3 V while PC7 is at 0 V, both with the same configuration written before.
Could PC4 pin be somewhat broken or am I doing something wrong?

EDIT
Example:

void main(void)
{
GPIO_Init(GPIOC, GPIO_Pin_4, GPIO_Mode_In_FL_No_IT);;
 //Green light on
GPIO_Init( GPIOE, GPIO_Pin_7, GPIO_Mode_Out_PP_High_Fast);
    
/* Set System Clock divider to 1 */
CLK->CKDIVR = 0x00;
}

This code just turn the on-board green led ON. When I try to apply 0 V to PC4 the led starts blinking... I think it is a hardware failure

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