eeprom_AT24C256_I2C驱动

最新推荐文章于 2023-07-18 16:54:49 发布

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最新推荐文章于 2023-07-18 16:54:49 发布 · 706 阅读

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#c #module #system #cache #null

这篇博客介绍了如何通过I2C总线对256Kbit的eeprom AT24C256进行读写操作。详细展示了驱动初始化、写入和读取数据的函数实现，包括使用I2C接口进行数据传输的步骤和错误处理。

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AT24C256 是256Kbit大小的eeprom，掉电仍可保留数据。本驱动实现了通过I2C总线对AT24C256的读写操作。

#include <asm/io.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/delay.h>
MODULE_LICENSE("Dual BSD/GPL");

#include "sti7105.h"
#include "stsys.h"
#include "stddefs.h"
#include "sti2c.h"
#include "stsys.h"
#define I2C1 0x01
//extern U32 at24c256_i2c1_cfg(void);
ST_DeviceName_t PIO_DeviceName[] = {"PIO0","PIO1","PIO2","PIO3","PIO4","PIO5","PIO6","PIO7","PIO8","PIO9","PIO10","PIO11","PIO12","PIO13","PIO14","PIO15","PIO16","PIO17","PIO18","PIO19","PIO20","PIO21","PIO22","PIO23","PIO24","PIO25","PIO26"};
static STI2C_Handle_t I2c_handle;
static U8 init_data[] =
{
 1, 0x00,
 2, 0xc0,
 3, 0x0a,
 4, 0xab,
 5, 0x08,
 6, 0x88,
 7, 0x00,
 8, 0xcd,
 9, 0x0f,
 10, 0xf0,
 11, 0x7f,
};
U32 static ee_i2c_write(U16 sub_addr,U8 *data,U16 data_size)
{
 
 STI2C_Params_t I2C_Params;
 U32 ErrCode;
 U32 nread ,nwrite;
 U8 buf_write[64];
// U8 buf_read[6