Arduino 反向工程松下红外代码校验和

我正在研制一台松下空调，它由红外遥控器控制。遥控器发送

12个字节

前5个字节始终相同。下面的

6个字节

对应于空调温度、风扇、功能和其他选项，我可以自己计算出来

最后一个

字节

是从第一个

11字节

（或从字节

6

到

11

）获得的校验和

因为我在运行时重新创建IR代码，所以我需要能够计算这些数据包的校验和。我尝试了许多标准的校验和算法，但没有一个给出有意义的结果

你能帮我找出这个设备使用的校验和函数吗

---

下面是一个数据包列表，由标题+数据的

11字节

和校验和的

1字节

组成，我可以从设备中捕获：

40 00 14 81 25 00 A0 65 00 00 26
40 00 14 81 25 00 A0 68 00 00 07 30
40 00 14 81 25 04 28 65 00 00 2A
40 00 14 81 25 04 28 68 00 00 2D
40 00 14 81 25 04 28 68 00 00 02 2F
40 00 14 81 25 04 28 68 00 00 03 30
40 00 14 81 25 04 28 68 00 00 04 31
40 00 14 81 25 04 28 68 00 00 05 32
40 00 14 81 25 04 28 68 00 00 07 34
40 00 14 81 25 04 28 69 00 00 01 2F
40 00 14 81 25 04 A0 68 00 00 07 34
40 00 14 81 25 08 9A 68 00 00 07 41
40 00 14 81 25 08 9C 68 00 00 07 43
40 00 14 81 25 08 9E 68 00 00 07 45
40 00 14 81 25 08 A0 68 00 31
40 00 14 81 25 08 A0 68 00 00 01 32
40 00 14 81 25 08 A0 68 00 00 02 33
40 00 14 81 25 08 A0 68 00 00 03 34
40 00 14 81 25 08 A0 68 00 00 07 38
40 00 14 81 25 08 A2 68 00 00 07 3A
40 00 14 81 25 08 A4 68 00 00 07 3C
40 00 14 81 25 08 A6 68 00 00 07 3E
40 00 14 81 25 08 A8 68 00 00 07 40
40 00 14 81 25 08 AA 68 00 00 07 42
40 00 14 81 25 08 AC 68 00 00 07 44
40 00 14 81 25 08 AE 68 00 00 07 46
40 00 14 81 25 09 A0 68 00 00 07 39
40 00 14 81 25 0A A0 68 00 00 07 3A
40 00 14 81 25 0C A0 68 00 00 07 3C
40 00 14 81 25 40 18 65 00 00 00 29
40 00 14 81 25 40 1A 65 00 00 2B
40 00 14 81 25 40 1C 65 00 00 2D
40 00 14 81 25 40 1E 65 00 00 2F
40 00 14 81 25 40 20 65 00 00 00 22
40 00 14 81 25 40 22 65 00 00 00 24
40 00 14 81 25 40 24 65 00 00 00 26
40 00 14 81 25 40 26 65 00 00 00 28
40 00 14 81 25 40 28 65 00 00 2A
40 00 14 81 25 40 2A 65 00 00 2C
40 00 14 81 25 40 2C 65 00 00 2E
40 00 14 81 25 40 2E 65 00 00 30
40 00 14 81 25 40 30 65 00 00 00 23
40 00 14 81 25 40 32 65 00 00 00 25
40 00 14 81 25 40 34 65 00 00 00 27
40 00 14 81 25 40 34 68 00 04 2E
40 00 14 81 25 80 1C 68 00 00 34
40 00 14 81 25 80 20 65 00 00 00 26
40 00 14 81 25 C0 20 65 00 00 2A
40 00 14 81 25 C0 28 68 00 00 02 37

我找到了一个匹配所有数据的候选校验和函数，但我认为需要进一步调整，因为我怀疑我使用的幻数取决于我没有正确考虑的其他因素

---

这就是我能够进行逆向工程的功能：

uint8\u t获取校验和（const uint8\u t data[]，const size\u t size）
{
断言（数据）；
uint8\u t校验和=0；
对于（大小i=0；i>4）+（数据[i]&0x0f）；
}
校验和-=8；/*幻数*/
返回校验和；
};

替代版本：

uint8\u t获取校验和（const uint8\u t data[]，const size\u t size）
{
断言（数据）；
uint8\u t校验和=0xF8；/*幻数*/
对于（大小i=0；i>4）+（数据[i]&0x0f）；
}
返回校验和；
};

---

示例：

#包括
#包括
#包括
uint8获取校验和（常数uint8数据[]，常数大小）
{
断言（数据）；
uint8\u t校验和=0xF8；/*幻数*/
对于（大小i=0；i>4）+（数据[i]&0x0f）；
}
返回校验和；
};
int main（）
{
常数大小=49；
常数大小=12；
uint8_tV[49][12]={
{0x40,0x00,0x14,0x81,0x25,0x00,0xA0,0x65,0x00,0x00,0x00,0x26}，
{0x40,0x00,0x14,0x81,0x25,0x00,0xA0,0x68,0x00,0x00,0x07,0x30}，
{0x40,0x00,0x14,0x81,0x25,0x04,0x28,0x65,0x00,0x00,0x00,0x2A}，
{0x40,0x00,0x14,0x81,0x25,0x04,0x28,0x68,0x00,0x00,0x00,0x2D}，
{0x40,0x00,0x14,0x81,0x25,0x04,0x28,0x68,0x00,0x00,0x02,0x2F}，
{0x40,0x00,0x14,0x81,0x25,0x04,0x28,0x68,0x00,0x00,0x03,0x30}，
{0x40,0x00,0x14,0x81,0x25,0x04,0x28,0x68,0x00,0x00,0x04,0x31}，
{0x40,0x00,0x14,0x81,0x25,0x04,0x28,0x68,0x00,0x00,0x05,0x32}，
{0x40,0x00,0x14,0x81,0x25,0x04,0x28,0x68,0x00,0x00,0x07,0x34}，
{0x40,0x00,0x14,0x81,0x25,0x04,0x28,0x69,0x00,0x00,0x01,0x2F}，
{0x40,0x00,0x14,0x81,0x25,0x04,0xA0,0x68,0x00,0x00,0x07,0x34}，
{0x40,0x00,0x14,0x81,0x25,0x08,0x9A，0x68,0x00,0x00,0x07,0x41}，
{0x40,0x00,0x14,0x81,0x25,0x08,0x9C，0x68,0x00,0x00,0x07,0x43}，
{0x40,0x00,0x14,0x81,0x25,0x08,0x9E，0x68,0x00,0x00,0x07,0x45}，
{0x40,0x00,0x14,0x81,0x25,0x08,0xA0,0x68,0x00,0x00,0x00,0x31}，
{0x40,0x00,0x14,0x81,0x25,0x08,0xA0,0x68,0x00,0x00,0x01,0x32}，
{0x40,0x00,0x14,0x81,0x25,0x08,0xA0,0x68,0x00,0x00,0x02,0x33}，
{0x40,0x00,0x14,0x81,0x25,0x08,0xA0,0x68,0x00,0x00,0x03,0x34}，
{0x40,0x00,0x14,0x81,0x25,0x08,0xA0,0x68,0x00,0x00,0x07,0x38}，
{0x40,0x00,0x14,0x81,0x25,0x08,0xA2,0x68,0x00,0x00,0x07,0x3A}，
{0x40,0x00,0x14,0x81,0x25,0x08,0xA4,0x68,0x00,0x00,0x07,0x3C}，
{0x40,0x00,0x14,0x81,0x25,0x08,0xA6,0x68,0x00,0x00,0x07,0x3E}，
{0x40,0x00,0x14,0x81,0x25,0x08,0xA8,0x68,0x00,0x00,0x07,0x40}，
{0x40,0x00,0x14,0x81,0x25,0x08,0xAA，0x68,0x00,0x00,0x07,0x42}，
{0x40,0x00,0x14,0x81,0x25,0x08,0xAC，0x68,0x00,0x00,0x07,0x44}，
{0x40,0x00,0x14,0x81,0x25,0x08,0xAE，0x68,0x00,0x00,0x07,0x46}，
{0x40,0x00,0x14,0x81,0x25,0