uint8_t e2prom_read(uint8_t address)
{
unsigned char val;

I2CStart();
I2CSendByte(0xa0);
I2CWaitAck();

I2CSendByte(address);
I2CWaitAck();

I2CStart();
I2CSendByte(0xa1);
I2CWaitAck();
val = I2CReceiveByte();
I2CWaitAck();
I2CStop();

return(val);
}
void e2prom_write(unsigned char address,unsigned char info)
{
I2CStart();
I2CSendByte(0xa0);
I2CWaitAck();

I2CSendByte(address);
I2CWaitAck();
I2CSendByte(info);
I2CWaitAck();
I2CStop();


}

i2c_init();
temp = e2prom_read(0xff);
Delay_Ms(2);
e2prom_write(0xff,++temp);
Delay_Ms(2);
sprintf(str1,"%s%d","ADDR:0xFF,VAL:",temp);
LCD_DisplayStringLine(Line6,str1);

int main(void)
{
/*!< At this stage the microcontroller clock setting is already configured,
this is done through SystemInit() function which is called from startup
file (startup_stm32f10x_xx.s) before to branch to application main.
To reconfigure the default setting of SystemInit() function, refer to
system_stm32f10x.c file
*/

/* System Clocks Configuration */
RCC_Configuration();

/* NVIC Configuration */
NVIC_Configuration();

/* GPIO Configuration */
GPIO_Configuration();

/* ---------------------------------------------------------------
TIM2 Configuration: Output Compare Timing Mode:
TIM2 counter clock at 6 MHz
CC1 update rate = TIM2 counter clock / CCR1_Val = 146.48 Hz
CC2 update rate = TIM2 counter clock / CCR2_Val = 219.7 Hz
CC3 update rate = TIM2 counter clock / CCR3_Val = 439.4 Hz
CC4 update rate = TIM2 counter clock / CCR4_Val = 878.9 Hz
--------------------------------------------------------------- */

/* Compute the prescaler value */
PrescalerValue = (uint16_t) (SystemCoreClock / 12000000) - 1;

/* Time base configuration */
TIM_TimeBaseStructure.TIM_Period = 65535;
TIM_TimeBaseStructure.TIM_Prescaler = 0;
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;

TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);

/* Prescaler configuration */
TIM_PrescalerConfig(TIM2, PrescalerValue, TIM_PSCReloadMode_Immediate);

/* Output Compare Timing Mode configuration: Channel1 */
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_Timing;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = CCR1_Val;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;

TIM_OC1Init(TIM2, &TIM_OCInitStructure);

TIM_OC1PreloadConfig(TIM2, TIM_OCPreload_Disable);

/* Output Compare Timing Mode configuration: Channel2 */
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = CCR2_Val;

TIM_OC2Init(TIM2, &TIM_OCInitStructure);

TIM_OC2PreloadConfig(TIM2, TIM_OCPreload_Disable);

/* Output Compare Timing Mode configuration: Channel3 */
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = CCR3_Val;

TIM_OC3Init(TIM2, &TIM_OCInitStructure);

TIM_OC3PreloadConfig(TIM2, TIM_OCPreload_Disable);

/* Output Compare Timing Mode configuration: Channel4 */
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = CCR4_Val;

TIM_OC4Init(TIM2, &TIM_OCInitStructure);

TIM_OC4PreloadConfig(TIM2, TIM_OCPreload_Disable);

/* TIM IT enable */
TIM_ITConfig(TIM2, TIM_IT_CC1 | TIM_IT_CC2 | TIM_IT_CC3 | TIM_IT_CC4, ENABLE);

/* TIM2 enable counter */
TIM_Cmd(TIM2, ENABLE);

while (1);
}

void time2_init(void)
{

GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
NVIC_InitTypeDef NVIC_InitStructure;

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);


/* Time base configuration */
TIM_TimeBaseStructure.TIM_Period = 65535;
TIM_TimeBaseStructure.TIM_Prescaler = 0;
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);

TIM_ITConfig(TIM2, TIM_IT_Update, ENABLE);
NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn; //TIM3?D??
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1; //?è??ó??è??0??
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3; //′óó??è??3??
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQí¨μà±?ê1?ü
NVIC_Init(&NVIC_InitStructure); //?ù?YNVIC_InitStruct?D???¨μ?2?êy3?ê??ˉíaéèNVIC??′??÷

/* TIM2 enable counter */
TIM_Cmd(TIM2, ENABLE);


}

```cpp
void TIM2_IRQHandler(void)
{
if (TIM_GetITStatus(TIM2, TIM_IT_CC1) != RESET)
{
TIM_ClearITPendingBit(TIM2, TIM_IT_CC1);

/* Pin PC.06 toggling with frequency = 73.24 Hz */
GPIO_WriteBit(GPIOC, GPIO_Pin_6, (BitAction)(1 - GPIO_ReadOutputDataBit(GPIOC, GPIO_Pin_6)));
capture = TIM_GetCapture1(TIM2);
TIM_SetCompare1(TIM2, capture + CCR1_Val);
}
else if (TIM_GetITStatus(TIM2, TIM_IT_CC2) != RESET)
{
TIM_ClearITPendingBit(TIM2, TIM_IT_CC2);

/* Pin PC.07 toggling with frequency = 109.8 Hz */
GPIO_WriteBit(GPIOC, GPIO_Pin_7, (BitAction)(1 - GPIO_ReadOutputDataBit(GPIOC, GPIO_Pin_7)));
capture = TIM_GetCapture2(TIM2);
TIM_SetCompare2(TIM2, capture + CCR2_Val);
}
else if (TIM_GetITStatus(TIM2, TIM_IT_CC3) != RESET)
{
TIM_ClearITPendingBit(TIM2, TIM_IT_CC3);

/* Pin PC.08 toggling with frequency = 219.7 Hz */
GPIO_WriteBit(GPIOC, GPIO_Pin_8, (BitAction)(1 - GPIO_ReadOutputDataBit(GPIOC, GPIO_Pin_8)));
capture = TIM_GetCapture3(TIM2);
TIM_SetCompare3(TIM2, capture + CCR3_Val);
}
else
{
TIM_ClearITPendingBit(TIM2, TIM_IT_CC4);

/* Pin PC.09 toggling with frequency = 439.4 Hz */
GPIO_WriteBit(GPIOC, GPIO_Pin_9, (BitAction)(1 - GPIO_ReadOutputDataBit(GPIOC, GPIO_Pin_9)));
capture = TIM_GetCapture4(TIM2);
TIM_SetCompare4(TIM2, capture + CCR4_Val);
}
}

void TIM2_IRQHandler(void)
{
static u16 key_count=0;
if (TIM_GetITStatus(TIM2, TIM_IT_Update) != RESET)
{
TIM_ClearITPendingBit(TIM2, TIM_IT_Update);
led_count++;
if(led_count==4000)
{
led_count=0;
led_flag=!led_flag;
}
}
}}

if (led_flag)
{
led_control(GPIO_Pin_9,1);
Delay_Ms(1000);
led_all();
}
else
{
led_control(GPIO_Pin_9,0);
Delay_Ms(1000);
led_all();
}