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December 14, 2015 20:08
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Пример как писать интерпретатор для байт полученных по usart.
2 команды 'x' и 'p'. После 'p' идёт 2 байта данных. Команды выполняются по \r\n
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void MakeCmdX(); | |
void MakeCmdP(uint16_t code); | |
uint16_t code; | |
char cmd = 0; | |
uint8_t c = 0; | |
/* Команды | |
x - Стоп | |
p - Установить NMR Period, 2 байта данных | |
s - Установить NMR Stop, 2 байта данных | |
e - Установить ЭПР Period, 2 байта данных | |
d - Установить ЭПР Stop, 2 байта данных | |
*/ | |
void MakeSomeCmd() { | |
if (cmd == 'x') { | |
MakeCmdX(); | |
} else { | |
switch (cmd) { | |
case 'p': | |
break; | |
} | |
} | |
} | |
void interpret(char s) { | |
switch (s) { | |
case 'p': | |
case 'x': | |
case 's': | |
case 'e': | |
case 'd': | |
if (cmd == 0) { | |
cmd = s; | |
c = 0; | |
code = 0; | |
} else { | |
cmd = 0; | |
} | |
break; | |
case '0': | |
case '1': | |
case '2': | |
case '3': | |
case '4': | |
case '5': | |
case '6': | |
case '7': | |
case '8': | |
case '9': | |
case 'A': | |
case 'B': | |
case 'C': | |
case 'D': | |
case 'E': | |
case 'F': | |
if ((cmd == 'p' || cmd == 's' || cmd == 'e' || cmd == 'd') && c < 4) { | |
code = code << 4; | |
if ( s <= '9' ) { | |
code |= s - '0'; | |
} else { | |
code |= s - 'A' + 0xA; | |
} | |
c++; | |
} else { | |
cmd = 0; | |
} | |
break; | |
case '\r': | |
case '\n': | |
MakeSomeCmd(); | |
cmd = 0; | |
break; | |
default: | |
cmd = 0; | |
break; | |
} | |
} |
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