Linux下使用pci 1720 DAQ板卡

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简述

PCI-1720U 是一款 PCI总线的4路12位隔离数字量到模拟量的输出卡

官方给出的板卡驱动是在win7下面安装的，这不符合我们Ubuntu电脑的需求

然后我上网搜了下Ubuntu/Linux环境下装这个板卡驱动可以用comedi

comedi

comedi是 Linux 下用于数据采集卡的驱动程序和工具链的源代码。它支持数百种不同的数据采集设备，PCI-1720U 正在其支持的设备列表中

官网：https://comedi.org/index.html

支持设备列表：

hardware

所以就给我们的Ubuntu装 comedi驱动和comedi库就行了

comedi驱动和库安装

我很惊喜的发现这个Ubuntu系统已经内置了comedi驱动了，不过就算没有也不要紧，可以从官网git clone然后安装

root@ddaq-System-Product-Name:/home/ddaq/da# modinfo comedi
filename:       /lib/modules/5.15.0-1084-realtime/kernel/drivers/comedi/comedi.ko
license:        GPL
description:    Comedi core module
author:         https://www.comedi.org
srcversion:     03206620A6FFD857542A37B
depends:
retpoline:      Y
intree:         Y
name:           comedi
vermagic:       5.15.0-1084-realtime SMP preempt_rt mod_unload modversions
sig_id:         PKCS#7
signer:         Build time autogenerated kernel key
sig_key:        0A:DC:8D:48:3A:26:BC:9F:17:DA:2B:60:0B:2C:32:B4:51:04:40:5C
sig_hashalgo:   sha512
signature:      1B:8D:20:8E:DB:E0:10:EA:C1:52:79:AC:2E:AD:F4:B3:C7:09:31:C3:
                62:56:28:14:09:8A:F2:D6:FC:22:A1:EC:A0:0C:06:F6:9E:C2:65:9D:
                1D:81:EC:CD:D7:52:87:6F:C7:A8:BC:59:FF:0F:5F:8C:BB:91:60:37:
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                CB:73:06:37:62:A3:59:80:4E:4D:19:68:1A:E0:39:BB:08:16:59:A6:
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                C4:0A:60:24:B8:EF:42:2F:0A:D4:25:B7:17:8D:BB:8E:97:F5:42:52:
                17:40:F3:E2:4B:DF:66:30:35:C1:1D:59:9F:8E:96:F5:97:1B:C3:D2:
                84:3B:45:ED:D3:5E:93:34:9C:A8:B3:6B:FF:93:24:2C:3B:01:C0:20:
                80:B7:E6:96:35:09:B4:8A:66:3C:83:96:A4:D8:A3:6B:CF:6A:0B:16:
                69:A0:39:BE:2C:D2:28:93:FD:55:1D:C0:2A:BC:CF:4B:80:3B:81:CC:
                A7:91:8A:A7:A1:B5:DD:2A:45:E4:8B:54:75:05:47:11:96:70:4D:49:
                E1:10:CE:F6:92:F9:81:40:9B:9A:69:F6:E5:BE:7C:ED:DF:BC:82:51:
                DC:AB:26:90:9F:B5:C6:89:FD:D6:21:9B
parm:           comedi_num_legacy_minors:number of comedi minor devices to reserve for non-                                                                                     auto-configured devices (default 0) (ushort)
parm:           comedi_default_buf_size_kb:default asynchronous buffer size in KiB (default                                                                                      2048) (uint)
parm:           comedi_default_buf_maxsize_kb:default maximum size of asynchronous buffer i                                                                                     n KiB (default 20480) (uint)

然后库comedilib也可以从官网git clone

不过我这里Ubuntu系统支持，直接用包管理器更方便

sudo apt install comedilib-dev

这时板卡插入电脑主板插槽，可以用这个指令来看装好没有

sudo comedi_board_info /dev/comedi0

命令显示

sudo comedi_board_info /dev/comedi0
overall info:
  version code: 0x00074c
  driver name: adv_pci1720
  board name: adv_pci1720
  number of subdevices: 2
subdevice 0:
  type: 2 (analog output)
  flags: 0x00020000
  number of channels: 4
  max data value: 4095
  ranges:
    all chans: [0 V,5 V] [0 V,10 V] [-5 V,5 V] [-10 V,10 V]
  command:
    not supported
subdevice 1:
  type: 3 (digital input)
  flags: 0x00010000
  number of channels: 4
  max data value: 1
  ranges:
    all chans: [0 V,5 V]
  command:
    not supported

看设备是否存在

ls /dev/comedi*

写一个驱动PCI 1720DAQ输出的简单程序

// pci1720_verify.c - 基础功能验证
#include <stdio.h>
#include <comedilib.h>
#include <unistd.h>

int main() {
    comedi_t *dev;
    int ret;
    
    // 打开设备
    dev = comedi_open("/dev/comedi0");
    if (!dev) {
        printf("错误：无法打开设备 /dev/comedi0\n");
        return 1;
    }
    printf("✓ PCI-1720U设备打开成功\n");
    
    // 验证模拟输出通道
    unsigned int subdevice = 0;  // 模拟输出子设备
    unsigned int channel, range = 0;  // 使用默认范围[0V,5V]
    unsigned int aref = AREF_GROUND;
    lsampl_t data;
    
    printf("测试4个模拟输出通道...\n");
    
    // 测试每个通道
    for (channel = 0; channel < 4; channel++) {
        // 设置到中间电压（2.5V）
        data = 2048;  // 4095对应5V，2048对应2.5V
        ret = comedi_data_write(dev, subdevice, channel, range, aref, data);
        
        if (ret < 0) {
            printf("✗ 通道 %d 写入失败\n", channel);
        } else {
            printf("✓ 通道 %d 设置为 2.5V (数据值: %d)\n", channel, data);
        }
        
        usleep(500000);  // 等待0.5秒
    }
    
    printf("等待3秒...\n");
    sleep(3);
    
    // 清零所有通道
    printf("清零所有通道...\n");
    for (channel = 0; channel < 4; channel++) {
        comedi_data_write(dev, subdevice, channel, range, aref, 0);
        printf("✓ 通道 %d 已清零\n", channel);
    }
    
    comedi_close(dev);
    printf("✓ 测试完成！\n");
    return 0;
}

编译和运行

gcc -o pci1720_verify pci1720_verify.c -lcomedi
sudo ./pci1720_verify

测试

首先知道引脚

pin

可以和转接板对应

board

然后示波器引出的那个线，接地的接到引脚里的AGND

探头就指向Vout1-4，示波器需要自己调一下频率和幅度

这四个Vout的输出是完全由程序决定的，程序怎么输出就是怎样

运行一个正弦波程序，看效果 sine

运行一个方波程序，看效果 sq

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