ST 编写锁存器、8位寄存器程序

原创已于 2023-09-28 10:42:30 修改 · 259 阅读

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于 2023-09-28 10:39:46 首次发布

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文章详细描述了FUNCTION_BLOCK中的FB_write_bit函数，该函数处理BOOL类型的输入bBitIn和bWrite，以及BYTE类型的nByteIn，通过位操作更新VAR_OUTPUT中的nByteState。同时，还展示了如何使用fb_write_byte函数对字节进行逐位写入。

FUNCTION_BLOCK FB_write_bit
VAR_INPUT
	bBitIn:BOOL;
	bWrite:BOOL;
END_VAR
VAR_OUTPUT
	bBitState:BOOL;
END_VAR
VAR
END_VAR

bBitState:=((bBitIn AND bWrite) OR bBitState) AND (NOT (NOT bBitIn AND bWrite));

FUNCTION_BLOCK FB_write_byte
VAR_INPUT
	nByteIn:BYTE;
	bWrite:BOOL;
END_VAR
VAR_OUTPUT
	nByteState:BYTE;
END_VAR
VAR
	fb_write_bit:ARRAY[0..7] OF FB_write_bit;
END_VAR

THIS^.fb_write_bit[0](bBitIn:=nByteIn.0 , bWrite:=bWrite , bBitState=>nByteState.0 );
THIS^.fb_write_bit[1](bBitIn:=nByteIn.1 , bWrite:=bWrite , bBitState=>nByteState.1 );
THIS^.fb_write_bit[2](bBitIn:=nByteIn.2 , bWrite:=bWrite , bBitState=>nByteState.2 );
THIS^.fb_write_bit[3](bBitIn:=nByteIn.3 , bWrite:=bWrite , bBitState=>nByteState.3 );
THIS^.fb_write_bit[4](bBitIn:=nByteIn.4 , bWrite:=bWrite , bBitState=>nByteState.4 );
THIS^.fb_write_bit[5](bBitIn:=nByteIn.5 , bWrite:=bWrite , bBitState=>nByteState.5 );
THIS^.fb_write_bit[6](bBitIn:=nByteIn.6 , bWrite:=bWrite , bBitState=>nByteState.6 );
THIS^.fb_write_bit[7](bBitIn:=nByteIn.7 , bWrite:=bWrite , bBitState=>nByteState.7 );