CANoe 通过USBTMC控制程控电源代码

下面是一个使用CANoe通过USBTMC控制程控电源的示例代码：

#include <windows.h>
#include <stdio.h>
#include <conio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include <tchar.h>
#include <visa.h>

ViSession defaultRM;
ViSession instr;

void main()
{
    ViStatus status;
    ViUInt32 retCnt;
    char instrDescriptor[VI_FIND_BUFLEN];
    ViFindList findList;
    ViUInt32 numInstrs;
    ViChar instrModel[128];
    ViChar instrSerial[128];
    ViChar instrFirmware[128];
    ViChar instrOptions[128];
    ViBoolean idQuery;
    ViBoolean resetInstr;
    ViUInt32 timeout = 2000;

    char cmd[256];
    char resp[256];

    // Initialize VISA
    status = viOpenDefaultRM(&defaultRM);
    if (status < VI_SUCCESS) {
        printf("Could not open a session to the VISA Resource Manager!\n");
        return;
    }

    // Find the instrument
    status = viFindRsrc(defaultRM, "USB[0-9]*::0xXXXX::0xXXXX::XXXXXXXX::INSTR", &findList, &numInstrs, instrDescriptor);
    if (status < VI_SUCCESS) {
        printf("Could not find the instrument!\n");
        viClose(defaultRM);
        return;
    }

    // Open the instrument session
    status = viOpen(defaultRM, instrDescriptor, VI_NULL, VI_NULL, &instr);
    if (status < VI_SUCCESS) {
        printf("Could not open a session to the instrument!\n");
        viClose(defaultRM);
        return;
    }

    // Initialize the instrument
    idQuery = VI_TRUE;
    resetInstr = VI_TRUE;
    status = viSetAttribute(instr, VI_ATTR_TMO_VALUE, timeout);
    if (status < VI_SUCCESS) {
        printf("Could not set timeout attribute!\n");
        viClose(instr);
        viClose(defaultRM);
        return;
    }

    status = viSetAttribute(instr, VI_ATTR_TERMCHAR_EN, VI_FALSE);
    if (status < VI_SUCCESS) {
        printf("Could not set termchar attribute!\n");
        viClose(instr);
        viClose(defaultRM);
        return;
    }

    status = viSetAttribute(instr, VI_ATTR_SEND_END_EN, VI_TRUE);
    if (status < VI_SUCCESS) {
        printf("Could not set send end attribute!\n");
        viClose(instr);
        viClose(defaultRM);
        return;
    }

    status = viSetAttribute(instr, VI_ATTR_TERMCHAR, '\n');
    if (status < VI_SUCCESS) {
        printf("Could not set termchar attribute!\n");
        viClose(instr);
        viClose(defaultRM);
        return;
    }

    status = viSetAttribute(instr, VI_ATTR_TERMCHAR_EN, VI_TRUE);
    if (status < VI_SUCCESS) {
        printf("Could not set termchar attribute!\n");
        viClose(instr);
        viClose(defaultRM);
        return;
    }

    status = viSetAttribute(instr, VI_ATTR_TMO_VALUE, timeout);
    if (status < VI_SUCCESS) {
        printf("Could not set timeout attribute!\n");
        viClose(instr);
        viClose(defaultRM);
        return;
    }

    status = viGetAttribute(instr, VI_ATTR_MODEL_NAME, instrModel);
    if (status < VI_SUCCESS) {
        printf("Could not get instrument model name!\n");
        viClose(instr);
        viClose(defaultRM);
        return;
    }

    status = viGetAttribute(instr, VI_ATTR_SERIAL_NUM, instrSerial);
    if (status < VI_SUCCESS) {
        printf("Could not get instrument serial number!\n");
        viClose(instr);
        viClose(defaultRM);
        return;
    }

    status = viGetAttribute(instr, VI_ATTR_SW_VERSION, instrFirmware);
    if (status < VI_SUCCESS) {
        printf("Could not get instrument firmware version!\n");
        viClose(instr);
        viClose(defaultRM);
        return;
    }

    status = viGetAttribute(instr, VI_ATTR_OPTIONS, instrOptions);
    if (status < VI_SUCCESS) {
        printf("Could not get instrument options!\n");
        viClose(instr);
        viClose(defaultRM);
        return;
    }

    printf("Instrument found:\n");
    printf("Model: %s\n", instrModel);
    printf("Serial: %s\n", instrSerial);
    printf("Firmware: %s\n", instrFirmware);
    printf("Options: %s\n", instrOptions);

    // Send commands to the instrument
    sprintf(cmd, "OUTPut ON");
    status = viWrite(instr, (ViBuf)cmd, (ViUInt32)strlen(cmd), &retCnt);
    if (status < VI_SUCCESS) {
        printf("Could not send command to the instrument!\n");
        viClose(instr);
        viClose(defaultRM);
        return;
    }

    sprintf(cmd, "VOLTage 5.0");
    status = viWrite(instr, (ViBuf)cmd, (ViUInt32)strlen(cmd), &retCnt);
    if (status < VI_SUCCESS) {
        printf("Could not send command to the instrument!\n");
        viClose(instr);
        viClose(defaultRM);
        return;
    }

    sprintf(cmd, "CURRent 1.0");
    status = viWrite(instr, (ViBuf)cmd, (ViUInt32)strlen(cmd), &retCnt);
    if (status < VI_SUCCESS) {
        printf("Could not send command to the instrument!\n");
        viClose(instr);
        viClose(defaultRM);
        return;
    }

    // Query the instrument
    sprintf(cmd, "MEASure:VOLTage?");
    status = viWrite(instr, (ViBuf)cmd, (ViUInt32)strlen(cmd), &retCnt);
    if (status < VI_SUCCESS) {
        printf("Could not send command to the instrument!\n");
        viClose(instr);
        viClose(defaultRM);
        return;
    }

    status = viRead(instr, (ViBuf)resp, 256, &retCnt);
    if (status < VI_SUCCESS) {
        printf("Could not read response from the instrument!\n");
        viClose(instr);
        viClose(defaultRM);
        return;
    }

    printf("Voltage: %s\n", resp);

    sprintf(cmd, "MEASure:CURRent?");
    status = viWrite(instr, (ViBuf)cmd, (ViUInt32)strlen(cmd), &retCnt);
    if (status < VI_SUCCESS) {
        printf("Could not send command to the instrument!\n");
        viClose(instr);
        viClose(defaultRM);
        return;
    }

    status = viRead(instr, (ViBuf)resp, 256, &retCnt);
    if (status < VI_SUCCESS) {
        printf("Could not read response from the instrument!\n");
        viClose(instr);
        viClose(defaultRM);
        return;
    }

    printf("Current: %s\n", resp);

    // Close the instrument session
    viClose(instr);

    // Close the default resource manager session
    viClose(defaultRM);
}

在代码中，我们使用了VISA库（Virtual Instrument Software Architecture），通过USB连接程控电源，控制电源的输出电压和电流，并查询电源的输出电压和电流。你需要将代码中的"USB[0-9]*::0xXXXX::0xXXXX::XXXXXXXX::INSTR"替换成你的程控电源的VISA资源描述符。