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Problem reading DS1307

hamed ad

Hi,

I am using the DS1307 library for STM32L152. The original library for STM32F429 is at here:
stm32f4-discovery.com/.../

It seems a complete library however after few modification to STM32L I cant read/write DS1307.
what ever is received is 1.

int main(void)
{
        TM_DS1307_Time_t tim;
        SystemCoreClockSetHSI();
        GPIO_RCC_configuration();
        GPIO_configuration();
        Init_SPI();
        uart1_configuration();
        I2C2_init();
        TIM4_configuration();

        TM_DS1307_SetDateTime(&tim);
        while(1)
        {

                tim.seconds=TM_DS1307_GetSeconds();
                sprintf(str," \r\ns=%u",tim.seconds);
                uart_out_str(str);
                delay_ms(1000);
        }
}


result is

s=1
s=1
s=1
s=1
s=1
s=1


I see signals in scope and there is a delay about 200ms when reading from DS1307 (reading timeout). when I debug, DR changes between 0xD0 and 0xD1. How can I find where the problem is?

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