单片机GD32F303RCT6 (Macos环境)开发 （十六）—— Eeprom AT24C08的读取

2023-10-13 20:10
文章标签 读取 开发 环境 单片机 macos 十六 eeprom gd32f303rct6 at24c08

本文主要是介绍单片机GD32F303RCT6 (Macos环境)开发 （十六）—— Eeprom AT24C08的读取，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

1、AT24C04 、AT24C08、AT24C016应该都适应这份代码，他们每一页的大小都是16字节。如果是AT24C02的话，每一页的大小为8个字节，修改一下#define I2C_PAGE_SIZE 8 应该也可以正常换页读取。
2、关于代码的宏定义配置
Application目录的Makefile中 ENABLE_I2C_TEST = yes才会编译I2C1的相关代码。
同时修改i2c.h文件，定义I2C1_MODE为I2C1_MODE_POLL，at24c08 .c 相关代码才会编译进去。
3、At24C08.c 核心就是一个换页写入的操作，因为eeprom连续写入时不支持自动换页，但是连续读取时，是可以自动换页的。

#include "gd32f30x.h"
#include "systick.h"
#include "at24c08.h"
#include "i2c.h"#if I2C1_MODE == I2C1_MODE_POLL #define I2C1_SPEED                          100000
#define EE_ADDR   							0xA0 
#define I2C_PAGE_SIZE                       16/*!\brief      write one byte to the I2C EEPROM\param[in]  p_buffer: pointer to the buffer containing the data to be written to the EEPROM\param[in]  write_address: EEPROM's internal address to write to\param[out] none\retval     none
*/
void eeprom_byte_write(uint8_t Data, uint8_t write_address)
{/* wait until I2C bus is idle */while(i2c_flag_get(I2C1, I2C_FLAG_I2CBSY));/* send a start condition to I2C bus */i2c_start_on_bus(I2C1);/* wait until SBSEND bit is set */while(!i2c_flag_get(I2C1, I2C_FLAG_SBSEND));/* send slave address to I2C bus */i2c_master_addressing(I2C1, EE_ADDR, I2C_TRANSMITTER);/* wait until ADDSEND bit is set */while(!i2c_flag_get(I2C1, I2C_FLAG_ADDSEND));/* clear the ADDSEND bit */i2c_flag_clear(I2C1,I2C_FLAG_ADDSEND);/* wait until the transmit data buffer is empty */while(SET != i2c_flag_get(I2C1, I2C_FLAG_TBE));/* send the EEPROM's internal address to write to : only one byte address */i2c_data_transmit(I2C1, write_address);/* wait until BTC bit is set */while(!i2c_flag_get(I2C1, I2C_FLAG_BTC));/* send the byte to be written */i2c_data_transmit(I2C1, Data); /* wait until BTC bit is set */while(!i2c_flag_get(I2C1, I2C_FLAG_BTC));/* send a stop condition to I2C bus */i2c_stop_on_bus(I2C1);/* wait until the stop condition is finished */while(I2C_CTL0(I2C1)&0x0200);
}/*!\brief      write more than one byte to the EEPROM with a single write cycle\param[in]  p_buffer: pointer to the buffer containing the data to be written to the EEPROM\param[in]  write_address: EEPROM's internal address to write to\param[in]  number_of_byte: number of bytes to write to the EEPROM\param[out] none\retval     none
*/
void eeprom_page_write(uint8_t* p_buffer, uint8_t write_address, uint8_t number_of_byte)
{/* wait until I2C bus is idle */while(i2c_flag_get(I2C1, I2C_FLAG_I2CBSY));/* send a start condition to I2C bus */i2c_start_on_bus(I2C1);/* wait until SBSEND bit is set */while(!i2c_flag_get(I2C1, I2C_FLAG_SBSEND));/* send slave address to I2C bus */i2c_master_addressing(I2C1, EE_ADDR, I2C_TRANSMITTER);/* wait until ADDSEND bit is set */while(!i2c_flag_get(I2C1, I2C_FLAG_ADDSEND));/* clear the ADDSEND bit */i2c_flag_clear(I2C1,I2C_FLAG_ADDSEND);/* wait until the transmit data buffer is empty */while( SET != i2c_flag_get(I2C1, I2C_FLAG_TBE));/* send the EEPROM's internal address to write to : only one byte address */i2c_data_transmit(I2C1, write_address);/* wait until BTC bit is set */while(!i2c_flag_get(I2C1, I2C_FLAG_BTC));/* while there is data to be written */while(number_of_byte--){  i2c_data_transmit(I2C1, *p_buffer);/* point to the next byte to be written */p_buffer++; /* wait until BTC bit is set */while(!i2c_flag_get(I2C1, I2C_FLAG_BTC));}/* send a stop condition to I2C bus */i2c_stop_on_bus(I2C1);/* wait until the stop condition is finished */while(I2C_CTL0(I2C1)&0x0200);
}/*!\brief      read data from the EEPROM\param[in]  p_buffer: pointer to the buffer that receives the data read from the EEPROM\param[in]  read_address: EEPROM's internal address to start reading from\param[in]  number_of_byte: number of bytes to reads from the EEPROM\param[out] none\retval     none
*/
void eeprom_buffer_read(uint8_t* p_buffer, uint8_t read_address, uint16_t number_of_byte)
{  /* wait until I2C bus is idle */while(i2c_flag_get(I2C1, I2C_FLAG_I2CBSY));if(2 == number_of_byte){i2c_ackpos_config(I2C1,I2C_ACKPOS_NEXT);}/* send a start condition to I2C bus */i2c_start_on_bus(I2C1);/* wait until SBSEND bit is set */while(!i2c_flag_get(I2C1, I2C_FLAG_SBSEND));/* send slave address to I2C bus */i2c_master_addressing(I2C1, EE_ADDR, I2C_TRANSMITTER);/* wait until ADDSEND bit is set */while(!i2c_flag_get(I2C1, I2C_FLAG_ADDSEND));/* clear the ADDSEND bit */i2c_flag_clear(I2C1,I2C_FLAG_ADDSEND);/* wait until the transmit data buffer is empty */while(SET != i2c_flag_get( I2C1 , I2C_FLAG_TBE));/* enable I2C1*/i2c_enable(I2C1);/* send the EEPROM's internal address to write to */i2c_data_transmit(I2C1, read_address);  /* wait until BTC bit is set */while(!i2c_flag_get(I2C1, I2C_FLAG_BTC));/* send a start condition to I2C bus */i2c_start_on_bus(I2C1);/* wait until SBSEND bit is set */while(!i2c_flag_get(I2C1, I2C_FLAG_SBSEND));/* send slave address to I2C bus */i2c_master_addressing(I2C1, EE_ADDR, I2C_RECEIVER);if(number_of_byte < 3){/* disable acknowledge */i2c_ack_config(I2C1,I2C_ACK_DISABLE);}/* wait until ADDSEND bit is set */while(!i2c_flag_get(I2C1, I2C_FLAG_ADDSEND));/* clear the ADDSEND bit */i2c_flag_clear(I2C1,I2C_FLAG_ADDSEND);if(1 == number_of_byte){/* send a stop condition to I2C bus */i2c_stop_on_bus(I2C1);}/* while there is data to be read */while(number_of_byte){if(3 == number_of_byte){/* wait until BTC bit is set */while(!i2c_flag_get(I2C1, I2C_FLAG_BTC));/* disable acknowledge */i2c_ack_config(I2C1,I2C_ACK_DISABLE);}if(2 == number_of_byte){/* wait until BTC bit is set */while(!i2c_flag_get(I2C1, I2C_FLAG_BTC));/* send a stop condition to I2C bus */i2c_stop_on_bus(I2C1);}/* wait until the RBNE bit is set and clear it */if(i2c_flag_get(I2C1, I2C_FLAG_RBNE)){/* read a byte from the EEPROM */*p_buffer = i2c_data_receive(I2C1);/* point to the next location where the byte read will be saved */p_buffer++; /* decrement the read bytes counter */number_of_byte--;} }/* wait until the stop condition is finished */while(I2C_CTL0(I2C1)&0x0200);/* enable acknowledge */i2c_ack_config(I2C1,I2C_ACK_ENABLE);i2c_ackpos_config(I2C1,I2C_ACKPOS_CURRENT);
}/*!\brief      wait for EEPROM standby state\param[in]  none\param[out] none\retval     none
*/
void eeprom_wait_standby_state(void)
{__IO uint32_t val = 0;while(1){/* wait until I2C bus is idle */while(i2c_flag_get(I2C1, I2C_FLAG_I2CBSY));/* send a start condition to I2C bus */i2c_start_on_bus(I2C1);/* wait until SBSEND bit is set */while(!i2c_flag_get(I2C1, I2C_FLAG_SBSEND));/* send slave address to I2C bus */i2c_master_addressing(I2C1, EE_ADDR, I2C_TRANSMITTER);/* keep looping till the Address is acknowledged or the AE flag is set (address not acknowledged at time) */do{/* get the current value of the I2C_STAT0 register */val = I2C_STAT0(I2C1);}while(0 == (val & (I2C_STAT0_ADDSEND | I2C_STAT0_AERR)));/* check if the ADDSEND flag has been set */if(val & I2C_STAT0_ADDSEND){/* clear ADDSEND flag */i2c_flag_clear(I2C1,I2C_FLAG_ADDSEND);/* send a stop condition to I2C bus */i2c_stop_on_bus(I2C1);/* exit the function */return ;}else{/* clear the bit of AE */i2c_flag_clear(I2C1,I2C_FLAG_AERR);}/* send a stop condition to I2C bus */i2c_stop_on_bus(I2C1);/* wait until the stop condition is finished */while(I2C_CTL0(I2C1)&0x0200);}
}/*!\brief      write buffer of data to the I2C EEPROM\param[in]  p_buffer: pointer to the buffer  containing the data to be written to the EEPROM\param[in]  write_address: EEPROM's internal address to write to\param[in]  number_of_byte: number of bytes to write to the EEPROM\param[out] none\retval     none
*/
void eeprom_buffer_write(uint8_t* p_buffer, uint8_t write_address, uint16_t number_of_byte)
{uint8_t number_of_page = 0, number_of_single = 0, address = 0, count = 0;address = write_address % I2C_PAGE_SIZE;count = I2C_PAGE_SIZE - address;number_of_page =  number_of_byte / I2C_PAGE_SIZE;number_of_single = number_of_byte % I2C_PAGE_SIZE;/* if write_address is I2C_PAGE_SIZE aligned  */if(0 == address){while(number_of_page--){eeprom_page_write(p_buffer, write_address, I2C_PAGE_SIZE); eeprom_wait_standby_state();write_address +=  I2C_PAGE_SIZE;p_buffer += I2C_PAGE_SIZE;}if(0 != number_of_single){eeprom_page_write(p_buffer, write_address, number_of_single);eeprom_wait_standby_state();}      }else{/* if write_address is not I2C_PAGE_SIZE aligned */if(number_of_byte < count){ eeprom_page_write(p_buffer, write_address, number_of_byte);eeprom_wait_standby_state();}else{number_of_byte -= count;number_of_page =  number_of_byte / I2C_PAGE_SIZE;number_of_single = number_of_byte % I2C_PAGE_SIZE;if(0 != count){eeprom_page_write(p_buffer, write_address, count);eeprom_wait_standby_state();write_address += count;p_buffer += count;} /* write page */while(number_of_page--){eeprom_page_write(p_buffer, write_address, I2C_PAGE_SIZE);eeprom_wait_standby_state();write_address +=  I2C_PAGE_SIZE;p_buffer += I2C_PAGE_SIZE;}/* write single */if(0 != number_of_single){eeprom_page_write(p_buffer, write_address, number_of_single); eeprom_wait_standby_state();}}}  
}#endif //#if I2C1_MODE == I2C1_MODE_POLL

at24c08.h

/*
**------------------------------------------------------------------------------------------------------
** Modified by:			
** Modified date:	
** Version:
** Descriptions:		
********************************************************************************************************/
#ifndef __24C08_H
#define __24C08_H
#include "i2c.h"#if I2C1_MODE == I2C1_MODE_POLL
/* Private function prototypes -----------------------------------------------*/
void eeprom_buffer_read(uint8_t* p_buffer, uint8_t read_address, uint16_t number_of_byte);
void eeprom_buffer_write(uint8_t* p_buffer, uint8_t write_address, uint16_t number_of_byte);
#endif  //#if I2C1_MODE == I2C1_MODE_POLL
#endif //__24C08_H
/*********************************************************************************************************END FILE
*********************************************************************************************************/

i2c1de 初始化在 i2c1.c中

/*** PB10 PB11 config I2C1
*/
void i2c1_config(void)
{/* enable GPIOB clock */rcu_periph_clock_enable(RCU_GPIOB);/* enable I2C1 clock */rcu_periph_clock_enable(RCU_I2C1);/* connect PB10 to I2C1_SCL *//* connect PB11 to I2C2_SDA */gpio_init(GPIOB, GPIO_MODE_AF_OD, GPIO_OSPEED_50MHZ, GPIO_PIN_10 | GPIO_PIN_11);//配置PB10,PB11为复用功能/* configure I2C clock */i2c_clock_config(I2C1, I2C1_SPEED, I2C_DTCY_2);/* configure I2C address */i2c_mode_addr_config(I2C1, I2C_I2CMODE_ENABLE, I2C_ADDFORMAT_7BITS, I2C1_SLAVE_ADDR);/* enable I2C1 */i2c_enable(I2C1);/* enable acknowledge */i2c_ack_config(I2C1, I2C_ACK_ENABLE);
}

4、主函数调用，我们连续写入一个字符串，超过16个字节，然后读取，看是否一致

    char r_buff[48] = {0};  char *buff = "hello world,GD32F330RCT6!";eeprom_buffer_write(r_buff,0,sizeof(r_buff)); //清零delay_1ms(200);eeprom_buffer_write(buff,0,strlen(buff));delay_1ms(200);eeprom_buffer_read(r_buff,0,48);printf("read data form eeprom = %s\r\n",r_buff);

5、开机打印信息如下：
在这里插入图片描述
6 、代码路径：https://gitee.com/xiaoguo-tec_0/gd32-iap-code.git

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