STM32f030C8 I2C EEPROM - 写入后读取时不接收数据

1万 · 2024-2-26 15:29

我正在使用STM32f030c8在24c04开发用于I2C eeprom的库。我的读写功能有效，但是当我在写入eeprom后立即尝试读取时，eeprom doest会返回任何数据。但是我可以马上连续写一下。只有在写入语句后才能读取问题。我尝试启用和禁用I2C使能位，但问题仍然存在。有人可以告诉我这是什么问题吗

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);
         }
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