Agilent Technologies E2094S Guia do Utilizador descarregar pdf (Página 114)

114 Agilent VISA User’s Guide

4 Programming via GPIB and VXI

Sample: Determining Window Mapping

ViAddr address;

Vi UInt16 access;

ViUInt16 value;

viMapAddress(vi, VI_A16_SPACE, 0x00, 0x04,

VI_FALSE,

VI_NULL, &address);

viGetAttribute(vi, VI_ATTR_WIN_ACCESS, &access);

If(access==VI_USE_OPERS) {

viPeek16(vi, (ViAddr)(((ViUInt16 *)address) +

4/sizeof(ViUInt16)), &value)

}else if (access==VI_DEREF_ADDR){

value=*((ViUInt16

*)address+4/sizeof(ViUInt16));

}else if (access==VI_NMAPPED){

return error;

}

Setting the VXI Trigger Line

The VI_ATTR_TRIG_ID attribute is used to set the VXI trigger line.

This attribute is listed under generic attributes and defaults to

VI_TRIG_SW (software trigger). To set one of the VXI trigger lines, set

the VI_ATTR_TRIG_ID attribute as follows:

viSetAttribute(vi, VI_ATTR_TRIG_ID,

VI_TRIG_TTL0);

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Agilent Technologies E2094S Guia do Utilizador Página 114