address_calculate

588 字

3 分钟

address_calculate

2022-10-21

💻Code

记录一次芯片的地址计算

地址介绍#

前几天刚发了一篇ltc2497的六层板绘制过程,这两天准备写它的驱动,奈何芯片比较小众只能自己写(练习一下)

先看他的地址列表

1
// #define LTC2497_I2C_ADDRESS 0x14    //  Low       Low       Low
2
// #define LTC2497_I2C_ADDRESS 0x16    //  Low       Low       High
3
// #define LTC2497_I2C_ADDRESS 0x15    //  Low       Low       Float
4
// #define LTC2497_I2C_ADDRESS 0x26    //  Low       High      Low
5
// #define LTC2497_I2C_ADDRESS 0x34    //  Low       High      High
6
// #define LTC2497_I2C_ADDRESS 0x27    //  Low       High      Float
7
// #define LTC2497_I2C_ADDRESS 0x17    //  Low       Float     Low
8
// #define LTC2497_I2C_ADDRESS 0x25    //  Low       Float     High
9
// #define LTC2497_I2C_ADDRESS 0x24    //  Low       Float     Float
10
// #define LTC2497_I2C_ADDRESS 0x56    //  High      Low       Low
11
// #define LTC2497_I2C_ADDRESS 0x64    //  High      Low       High
12
// #define LTC2497_I2C_ADDRESS 0x57    //  High      Low       Float
13
// #define LTC2497_I2C_ADDRESS 0x74    //  High      High      Low
14
// #define LTC2497_I2C_ADDRESS 0x76    //  High      High      High
15
// #define LTC2497_I2C_ADDRESS 0x75    //  High      High      Float
16
// #define LTC2497_I2C_ADDRESS 0x65    //  High      Float     Low
17
// #define LTC2497_I2C_ADDRESS 0x67    //  High      Float     High
18
// #define LTC2497_I2C_ADDRESS 0x66    //  High      Float     Float
19
// #define LTC2497_I2C_ADDRESS 0x35    //  Float     Low       Low
20
// #define LTC2497_I2C_ADDRESS 0x37    //  Float     Low       High
21
// #define LTC2497_I2C_ADDRESS 0x36    //  Float     Low       Float
22
// #define LTC2497_I2C_ADDRESS 0x47    //  Float     High      Low
23
// #define LTC2497_I2C_ADDRESS 0x55    //  Float     High      High
24
// #define LTC2497_I2C_ADDRESS 0x54    //  Float     High      Float
25
// #define LTC2497_I2C_ADDRESS 0x44    //  Float     Float     Low
26
// #define LTC2497_I2C_ADDRESS 0x46    //  Float     Float     High
27
// #define LTC2497_I2C_ADDRESS 0x45    //  Float     Float     Float

看起来很复杂,貌似没有规律

地址计算#

刚开始我也没看出来,然后我把它放到万能的excel中排了一下序列,结果如下

(第一排是16进制,缺了 0x 不要介意)

规律如下:

第一排的第一个数字,也就是地址前四位依次为1-7
第二排都为4-7
low < float < high

是不是发现了规律

本质上就是三进制转为8进制+4进制再加一个基地址0x14

程序编写验证#

拿clion新建了个工程试一下

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void set_ltc2497_adress(uint8_t addr2,uint8_t addr1, uint8_t addr0)
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{
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    //auto calculate the address
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    uint8_t num = 0x00;
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    num = addr2*9 + addr1*3 + addr0*1;
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    num = ((num/4) << 4)|(num%4);
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    num = num + 0x14;
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    std::cout << "address: " << "0x" << std::hex << int(num) << std::endl;
9

10

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}
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int main()
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{
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    //输出全部地址
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    for (int i = 0; i < 3; i++)
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    {
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        for (int j = 0; j < 3; j++)
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        {
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            for (int k = 0; k < 3; k++)
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            {
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                set_ltc2497_adress(i, j, k);
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            }
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        }
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    }
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27

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    system("pause");
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    return 0;
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  return 0;
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}

输出结果如下

1
address: 0x14
2
address: 0x15
3
address: 0x16
4
address: 0x17
5
address: 0x24
6
address: 0x25
7
address: 0x26
8
address: 0x27
9
address: 0x34
10
address: 0x35
11
address: 0x36
12
address: 0x37
13
address: 0x44
14
address: 0x45
15
address: 0x46
16
address: 0x47
17
address: 0x54
18
address: 0x55
19
address: 0x56
20
address: 0x57
21
address: 0x64
22
address: 0x65
23
address: 0x66
24
address: 0x67
25
address: 0x74
26
address: 0x75
27
address: 0x76