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how to solve this error pwm.c(76): error: #137: expression must be a modifiable lvalue
17 #define left1 IOPIN0 = (1 << 11)
18 #define right1 IOPIN0 = (1 << 8) . . . 74 if(center)
75 return 0;
76 else if(left1 | right1 ) {... ..