IAR environment definition bit variable flag bit STM8 MSP430 Universal

First create a common point H file, add the common code as follows

typedef union{    struct    {        unsigned char b0:1;        unsigned char b1:1;        unsigned char b2:1;        unsigned char b3:1;        unsigned char b4:1;        unsigned char b5:1;        unsigned char b6:1;        unsigned char b7:1;    } Bits;} Uint8_val;

General definition when the union is written, to define a flag bit that occupies only a byte, simply define the Uchar byte and then refer to one of its members.

For example, define a consortium in C file, add code

Uint8_val  BitFlag1 = {0x00};//Each bit is initialized to 0 if 1 is available for a location BITX

Well, define a BITFLAG1 union, if you want to reference one of the bit flags in another point C file, just declare it outside the point H file, as shown in the following code

--------------------bit variable declaration--------------------------extern uint8_val  BitFlag1; #define t1msflagbitflag1.bits.b0//Task 1

The Union BITFLAG1 is declared externally, and the macro defines one of the bits t1msflag as the lowest byte in the union, and in other C files It is possible to perform Boolean read and write operations directly on the T1msflag.

IAR environment definition bit variable flag bit STM8 MSP430 Universal