STM32f030C8 I2C EEPROM - keine Daten empfangen, wenn nach einem Schreibvorgang gelesen wird

Ich entwickle eine Bibliothek für I2C eeprom at24c04 mit stm32f030c8 . Meine Lese- und Schreibfunktionen funktionieren, aber wenn ich versuche, unmittelbar nach einem Schreibvorgang in das Eeprom zu lesen, gibt das Eeprom keine Daten zurück. aber ich könnte sofort hintereinander schreiben. Das Problem tritt nur auf, wenn ich nach einer Schreibanweisung lese. Ich habe versucht, das I2C-Aktivierungsbit zu aktivieren und zu deaktivieren, aber das Problem besteht weiterhin. Kann mir jemand sagen, was das Problem ist.

void main()
{
   Configure_GPIO_I2C2();
   Configure_I2C2_Master(0xA0,1);

    I2C_WriteByte(5,'k');
    charr= I2C_ReadByte(5);//the program get stuck here because no byte is 
                            //received from eeprom
    UART_Send_String(1,&charr);

}

void I2C_WriteByte(uint8_t addr,uint8_t bytetowrite)
            {
                I2C2->ISR=0x01;
                I2C2_StartWrite(2);//start

                I2C2->TXDR = addr;//write addr
                while(!(I2C2->ISR & I2C_ISR_TXE));

                //I2C2_StartWrite(1);

                I2C2->TXDR = bytetowrite;
                while(!(I2C2->ISR & I2C_ISR_TXE));

                I2C2->CR2 |= I2C_CR2_STOP;//stop
                while(I2C2->CR2 & I2C_CR2_STOP);

            }

            uint8_t I2C_ReadByte(uint8_t byteToRead)
            {
                I2C2->ISR=0x01;
                I2C2_StartWrite(1);

                I2C2->TXDR = byteToRead;
                while(!(I2C2->ISR & I2C_ISR_TXE));

                I2C2_StartRead(1);  
                while(!(I2C2->ISR & I2C_ISR_RXNE));
                UART_Send_String(1,"r strt");
                uint8_t recv_data=I2C2->RXDR;   


                I2C2->CR2 |= I2C_CR2_STOP;
                while(I2C2->CR2 & I2C_CR2_STOP);

                return recv_data;

            }


            /////////////////////////////////////////////////////////
            /////////////////////////////////////////////////////////
            void Configure_GPIO_I2C2(void)
            {

                RCC->AHBENR |= RCC_AHBENR_GPIOFEN;  
                GPIOF->MODER |= (2<<12) | (2<<14);  
                GPIOF->OTYPER |= GPIO_OTYPER_OT_6 | GPIO_OTYPER_OT_7; 

                GPIOF->OSPEEDR &=  ~(1<<12);
                GPIOF->OSPEEDR &=  ~(1<<14);

                GPIOF->PUPDR &= ~(1<<12);
                GPIOF->PUPDR &= ~(1<<12);
            }

        void Configure_I2C2_Master(uint8_t slave_addr,uint8_t no_of_bytes)
            {

                RCC->APB1ENR |= RCC_APB1ENR_I2C2EN;

                /* (1) Timing register value is computed with the AN4235 xls file,
                 fast Mode @400kHz with I2CCLK = 48MHz, rise time = 140ns, fall time = 40ns */  
                I2C2->CR1 &= ~I2C_CR1_PE;
                I2C2->TIMINGR |= (uint32_t)0x00B01A4B; /* (1) */
                I2C2->CR2 |= (uint8_t)slave_addr;
                I2C2->CR2 |= no_of_bytes<<16;   
                I2C2->CR1 |= I2C_CR1_PE;
                //NVIC_SetPriority(I2C2_IRQn, 0); /* (7) */
                //NVIC_EnableIRQ(I2C2_IRQn); /* (8) */
            }

    void I2C2_StartWrite(int bytesToWrite)
            {

                I2C2->CR2 &= ~I2C_CR2_RD_WRN;

                I2C2->CR2 |= bytesToWrite<<16;

                I2C2->CR2 |= I2C_CR2_START;
                while(I2C2->CR2 & I2C_CR2_START);
            }



            void I2C2_StartRead(int bytesToRead)
            {
            I2C2->CR2 |= I2C_CR2_RD_WRN;

                I2C2->CR2 |= bytesToRead<<16;

                I2C2->CR2 |= I2C_CR2_START;
                while(I2C2->CR2 & I2C_CR2_START);
            }