136 lines
2.9 KiB
C
136 lines
2.9 KiB
C
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#include "drv_at24cxx.h"
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#include "stdio.h"
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#include "string.h"
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static I2C_t *prv_i2c = NULL;//私有i2c指针
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I2C_t* AT24C_Init(I2C_HandleTypeDef *hi2c)
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{
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I2C_t* i2c;
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i2c = (I2C_t *)malloc(sizeof(I2C_t));
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i2c->hi2c = hi2c;
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i2c->address = DEV_ADDR;
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i2c->page_num = PAGE_NUM;
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i2c->page_size = PAGE_SIZE;
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i2c->capacity = CAPACITY_SIZE;
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i2c->addr_num = ADDR_BYTE_NUM;
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i2c->delay = 2;
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/**
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* 给全局变量赋值
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*/
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prv_i2c = i2c;
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return i2c;
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}
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unsigned char AT24C_Write(uint16_t addr,uint8_t* buff,uint16_t len)
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{
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if(!prv_i2c)
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{
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return HAL_ERROR;
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}
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HAL_StatusTypeDef rst;
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uint16_t i = 0;
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uint16_t cnt = 0; //写入字节计数
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uint16_t head;
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uint16_t left;
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uint16_t tail;
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if((len + addr - 1)/prv_i2c->page_size == addr/prv_i2c->page_size) //如果在同一页
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{
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rst = HAL_I2C_Mem_Write(prv_i2c->hi2c, prv_i2c->address | 0x00, addr, prv_i2c->addr_num, buff, len, 0xFFFF);
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HAL_Delay(prv_i2c->delay * len);
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}
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else
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{
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head = (addr / prv_i2c->page_size+1) * prv_i2c->page_size - addr; //开始页剩余待写入字节数
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left = len - head; //除去开始页剩下字节数
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tail=left-left/prv_i2c->page_size*prv_i2c->page_size; //末页待写入字节数
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rst = HAL_I2C_Mem_Write(prv_i2c->hi2c, prv_i2c->address | 0x00, addr, prv_i2c->addr_num, buff, head, 0xffff);
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HAL_Delay(prv_i2c->delay * head);
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for(i=0; i<left/prv_i2c->page_size; i++)
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{
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rst = HAL_I2C_Mem_Write(prv_i2c->hi2c, prv_i2c->address | 0x00, addr + head + i * prv_i2c->page_size, prv_i2c->addr_num, buff + head + i * prv_i2c->page_size , prv_i2c->page_size, 0xFFFF);
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HAL_Delay(prv_i2c->delay*prv_i2c->page_size);
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if(rst != HAL_OK)
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{
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return (unsigned char)rst;
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}
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}
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rst = HAL_I2C_Mem_Write(&hi2c1, prv_i2c->address | 0x00, addr + head + i * prv_i2c->page_size, prv_i2c->addr_num, buff + head+ i * prv_i2c->page_size, tail, 0xffff);
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HAL_Delay(prv_i2c->delay * tail);
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}
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return (unsigned char)rst;
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}
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unsigned char AT24C_Read(uint16_t addr,uint8_t* buff,uint16_t len)
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{
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if(!prv_i2c)
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{
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return HAL_ERROR;
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}
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HAL_StatusTypeDef rst;
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if(addr + len < 0x8000)
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{
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rst = HAL_I2C_Mem_Read(prv_i2c->hi2c, prv_i2c->address | 0x01, addr, prv_i2c->addr_num, buff, len, 0xffff);
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}
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return (unsigned char)rst;
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}
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uint8_t AT24C_Check(void)
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{
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uint8_t temp;
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uint8_t data = 0XAB;
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AT24C_Read(0x00,&temp,1);//避免每次开机都写AT24CXX
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if(temp != 0XAB)
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{
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return 1;
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}
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else//排除第一次初始化的情况
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{
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AT24C_Write(0x00,&data,1);
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AT24C_Read(0x00,&temp,1);
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if(temp != 0XAB)
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{
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return 1;
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}
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}
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return 0;
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}
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void AT24C_Fill(uint8_t fill)
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{
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uint8_t erase[512];//这个缓存太大
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memset(erase,fill,512);
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for(uint16_t i=0;i<64;i++)
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{
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AT24C_Write(i*512,erase,512);
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}
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}
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