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FPGA学习笔记-I2C协议之Verilog编写解析+EEPROM读写测试+Vivado工程

  • 2026-03-15 02:24:38
FPGA学习笔记-I2C协议之Verilog编写解析+EEPROM读写测试+Vivado工程

整体功能

通过I2C

1、E2PROM存储器地址0~255依次写入数据0~255

2、E2PROM存储器地址0~255依次读出数据;

3、如果读出的值全部正确,则LED灯常亮,否则 LED 灯闪烁。

该代码已在Vivado工程上编译通过,且下载到板卡上验证正确,想要获取整个工程或者技术交流,可以关注公众号,然后发送消息私聊哈。

顶层模块

2.1接口定义

2.2公共参数定义

这里可以设置器件地址、I2C速率、读写的字节个数等;

2.3产生100MHz时钟

2.4模块例化:e2prom读写测试模块

2.5模块例化:i2c驱动模块

这是I2C协议的具体部分:

2.6模块例化:led指示模块

子模块详解

3.1 e2prom读写测试模块

3.1.1接口定义

3.1.2读写测试逻辑

1、先进行复位初始化,此时写入地址、数据、触发执行信号都是0

2、在用case语句进行条件选择控制;

1)首先在2'd0条件:通过计数器(wait_cnt)等待一个时间间隔,计数器(flow_cnt)才能计数,且触发执行信号变成1,此时i2c驱动模块会执行写入操作(写入0);

2)然后转入2'd1条件:等待i2c驱动模块给到i2c_done信号后,将计数器写入地址、数据都+1,同时(flow_cnt)变成0,又进入2'd0条件;如此往复执行256次后,即完成向存储器地址0~255分别写入数据0~255

3)然后地址清零,执行读操作,并转入2'd2条件:触发执行信号变成1,此时i2c驱动模块会执行读操作(地址为0),计数器(flow_cnt+1

4)然后转入2'd3条件:等待i2c驱动模块给到i2c_done信号后,执行数值比较逻辑,如果读取错误或者应答失败,执行rw_done <= 1'b1;rw_result <= 1'b0;此时一直处于2'd3条件,但由于i2c驱动模块给到i2c_done信号不再有效,所以会一直处在2'd3条件,不再执行任何操作;如果读取正确,则将地址、数据都+1,又进入2'd2条件;如此往复执行256次后,即完成读取存储器地址0~255中的数据,然后执行rw_done<= 1'b1;rw_result <= 1'b1; 此时一直处于2'd3条件,但由于i2c驱动模块给到i2c_done信号不再有效,所以会一直处在2'd3条件,不再执行任何操作;

3.2 i2c驱动模块

3.2.1接口定义

3.2.2产生SCL四倍频率驱动时钟

3.2.3三段式状态机

3.2.3.1 同步时序描述状态转移

采用的是SCL四倍频率驱动时钟

3.2.3.2 组合逻辑判断状态转移条件

1、复位初始化后:进入空闲状态(st_idle);

2、触发执行信号到来后:进入发送器件地址状态(st_sladdr);

3、从机应答后:进入发送位字地址(8st_addr816st_addr16)状态;

4、从机应答后:如果是写操作,进入写状态(st_data_wr);如果是读操作,进入读状态(st_addr_rd);

5、如果在写状态(st_data_wr):从机应答后,进入结束I2C操作状态(st_stop);

6、如果在读状态(st_addr_rd,需要先发送一个器件地址):从机应答后,进入读数据状态(st_data_rd);

7、如果在读数据状态(st_data_rd):从机应答后,进入结束I2C操作状态(st_stop);

8、如果在结束I2C操作状态(st_stop):从机应答后,进入空闲状态(st_idle);

3.2.3.3 时序电路描述状态输出

采用的是SCL四倍频率驱动时钟;

1、先进行复位初始化,此时总线为高(sclsda_out),主机发送(sda_dir=1),其余诸信号都为0

2、然后进入case条件选择状态:

1)首先在st_idle状态:在给到触发执行信号后,准备好写入的字地址、字数据;同时跳转到st_sladdr状态(组合逻辑控制跳转的);

2)st_sladdr状态:通过计数器(cnt),依次送出器件地址(高位在前),同时给出应答信号(i2c_ack),进入st_addr16/st_addr8状态(由bit_ctrl控制);

3)st_addr8状态为例:通过计数器(cnt),依次送出字地址(高位在前),同时给出应答信号(i2c_ack),如果是写进入st_data_wr状态,如果是读进入st_addr_rd状态;

4)st_data_wr状态:通过计数器(cnt),依次送出字数据(高位在前),同时给出应答信号(i2c_ack),进入st_stop状态;

5)st_addr_rd状态:通过计数器(cnt),依次送出器件地址(高位在前),同时给出应答信号(i2c_ack),进入st_data_rd状态;

6)st_data_rd状态:通过计数器(cnt),依次读出字数据(高位在前),同时给出非应答信号,进入st_stop状态;

7)st_stop状态:通过计数器(cnt),主机发送停止信号,进入st_idle状态;

4 写在最后
以上为整理总结笔记,供交流学习;
部分截图来源于网络,如若侵权,请联系删除。
欢迎各位朋友关注,进行技术交流;

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  1. CONNECT:[ UseTime:0.000814s ] mysql:host=127.0.0.1;port=3306;dbname=no_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001686s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000791s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000674s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001461s ]
  6. SELECT * FROM `set` [ RunTime:0.000676s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001666s ]
  8. SELECT * FROM `article` WHERE `id` = 474335 LIMIT 1 [ RunTime:0.008796s ]
  9. UPDATE `article` SET `lasttime` = 1773523758 WHERE `id` = 474335 [ RunTime:0.036436s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000708s ]
  11. SELECT * FROM `article` WHERE `id` < 474335 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001894s ]
  12. SELECT * FROM `article` WHERE `id` > 474335 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.002277s ]
  13. SELECT * FROM `article` WHERE `id` < 474335 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.006428s ]
  14. SELECT * FROM `article` WHERE `id` < 474335 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.011757s ]
  15. SELECT * FROM `article` WHERE `id` < 474335 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.031044s ]
0.180302s