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#define BTI_MSK(bit)    (1 << (bit))
#define BIT_SET(x,bit)  ((x) |=  BTI_MSK (bit))
#define BIT_CLR(x,bit)  ((x) &= ~BTI_MSK (bit))
#define BIT_TST(x,bit)  ((x) &   BTI_MSK (bit))
 /****************************************/
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{
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