National Instruments PCI E Series - Page 111

Chapter 4 Programming
PCI E Series RLPM 4-48
© National Instruments Corporation
G0_Load_A_Registers (24 bits)
G0_Load_A=0x0000; //initial counter value
G0_Command_Register
G0_Load=1;
G0_Input_Select_Register
G0_Source_Select=0; (G_In_TimeBase)
G0_Source_Polarity=0; (rising edges)
G0_Gate_Select=5; (PFI4)
G0_OR_Gate=0;
G0_Output_Polarity=0; (active high)
G0_Gate_Select_Load_Source=0;
G0_Mode_register
G0_Output_Mode=1; (one clock cycle output)
G0_Gate_Polarity = 1; (enable inversion)
G0_Loading_On_Gate = 1;
G0_Loading_On_TC = 0;
GO_Gating_Mode = 1;
G0_Gate_On_Both_Edges = 0;
GO_Trigger_Mode_For_Edge_Gate = 3;
G0_Stop_Mode = 0;
G0_Counting_Once = 0;
G0_Command_Register
G0_Up_Down = 1; (up counting)
G0_Bank_Switch_Enable = 0;
G0_Bank_Switch_Mode = 0;
Interrupt_A_Enable_Register
G0_TC_Interrupt_Enable = 0;
G0_Gate_Interrupt_Enable = 1;
3. Call
G0_Arm() to begin the operation.
G0_Command_Register
G0_Arm=1;
4.
Pulse_Width_Measurement_ISR() performs the reading from
HW_Save Register.
save_1=G0_HW_Registers (24 bits);
if (G0_Stale_Data_St==1) then
save_1=0;