【Vision Board 創客營】Vision Board上的DAC實踐

1、概述

感謝官方舉辦【Vision Board 創客營】活動，使得我有機會試用Vision Board開發板，體驗嵌入式AI的快樂。在此，再次感謝官方以及導師們的熱情幫助。在本次活動中，本人選擇的是DAC功能的測試。

2、環境配置

配置

? 系統：Win11

? 開發板：RA8-M85-vision-board

? 開發IDE：RTThread Studio 版本: 2.2.6

環境配置

• 下載[開發所需軟件資料]
• 根據官方提供的[文檔]( [Vision Board 環境搭建 (qq.com)])搭建開發環境

3、新建工程以及編寫測試例程

1. 新建工程
   • 打開RTThread Studio IDE ，選擇文件 --> 新建 --> RT-Thread 項目
   • 輸入工程信息，可參考下圖：

• 使能DAC驅動框架，可參考下圖：

• 打開RA Smart Configurator （記得選擇sc_v2023-10_fsp_v5.1.0 文件夾），進行DAC硬件功能配置，具體可參考下圖：

2. 測試程序
   • 在工程src目錄中，右鍵新建 test_dac.c 文件，文件內容如下：

     /**
      功能說明：通過DAC生成一個正弦波，其中每一個dac的輸出值，是通過py程序自動生成，可在附錄中自取
     */
     /*
      * Copyright (c) 2006-2021, RT-Thread Development Team
      *
      * SPDX-License-Identifier: Apache-2.0
      *
      * Change Logs:
      * Date           Author       Notes
      * 2024-04-20     MagicKingC       the first version
      */
     #include < rtthread.h >
     #include < rtdevice.h >
     
     #define DAC_DEV_NAME    "dac0"
     #define DAC_DEV_CHANNEL 0
     
     static rt_uint32_t sin_wave_vaule[]={
             2048,2073,2098,2123,2149,2174,2199,2224,2249,2274,
             2299,2324,2349,2374,2399,2423,2448,2473,2497,2522,
             2546,2571,2595,2619,2643,2667,2691,2715,2739,2763,
             2786,2810,2833,2856,2879,2902,2925,2947,2970,2992,
             3015,3037,3059,3081,3102,3124,3145,3166,3187,3208,
             3229,3249,3269,3290,3309,3329,3349,3368,3387,3406,
             3425,3443,3462,3480,3498,3515,3533,3550,3567,3584,
             3600,3617,3633,3648,3664,3679,3694,3709,3724,3738,
             3752,3766,3780,3793,3806,3819,3831,3843,3855,3867,
             3878,3890,3900,3911,3921,3931,3941,3950,3960,3968,
             3977,3985,3993,4001,4008,4015,4022,4029,4035,4041,
             4046,4052,4057,4061,4066,4070,4074,4077,4080,4083,
             4086,4088,4090,4092,4093,4094,4095,4095,4095,4095,
             4094,4093,4092,4091,4089,4087,4084,4082,4079,4075,
             4072,4068,4064,4059,4054,4049,4044,4038,4032,4026,
             4019,4012,4005,3997,3989,3981,3973,3964,3955,3946,
             3936,3926,3916,3906,3895,3884,3873,3861,3849,3837,
             3825,3812,3799,3786,3773,3759,3745,3731,3717,3702,
             3687,3672,3656,3641,3625,3608,3592,3575,3559,3541,
             3524,3507,3489,3471,3453,3434,3416,3397,3378,3358,
             3339,3319,3300,3280,3259,3239,3218,3198,3177,3156,
             3134,3113,3091,3070,3048,3026,3004,2981,2959,2936,
             2913,2891,2868,2844,2821,2798,2774,2751,2727,2703,
             2679,2655,2631,2607,2583,2559,2534,2510,2485,2460,
             2436,2411,2386,2361,2336,2312,2287,2262,2237,2211,
             2186,2161,2136,2111,2086,2061,2035,2010,1985,1960,
             1935,1910,1885,1859,1834,1809,1784,1760,1735,1710,
             1685,1660,1636,1611,1586,1562,1537,1513,1489,1465,
             1441,1417,1393,1369,1345,1322,1298,1275,1252,1228,
             1205,1183,1160,1137,1115,1092,1070,1048,1026,1005,
             983,962,940,919,898,878,857,837,816,796,
             777,757,738,718,699,680,662,643,625,607,
             589,572,555,537,521,504,488,471,455,440,
             424,409,394,379,365,351,337,323,310,297,
             284,271,259,247,235,223,212,201,190,180,
             170,160,150,141,132,123,115,107,99,91,
             84,77,70,64,58,52,47,42,37,32,
             28,24,21,17,14,12,9,7,5,4,
             3,2,1,1,1,1,2,3,4,6,
             8,10,13,16,19,22,26,30,35,39,
             44,50,55,61,67,74,81,88,95,103,
             111,119,128,136,146,155,165,175,185,196,
             206,218,229,241,253,265,277,290,303,316,
             330,344,358,372,387,402,417,432,448,463,
             479,496,512,529,546,563,581,598,616,634,
             653,671,690,709,728,747,767,787,806,827,
             847,867,888,909,930,951,972,994,1015,1037,
             1059,1081,1104,1126,1149,1171,1194,1217,1240,1263,
             1286,1310,1333,1357,1381,1405,1429,1453,1477,1501,
             1525,1550,1574,1599,1623,1648,1673,1697,1722,1747,
             1772,1797,1822,1847,1872,1897,1922,1947,1973,1998,
             2023,2048
     };
     
     /**
      * 通過dac生成sin波形
      * @param agrc
      * @param agrv
      * @return
      */
     static int sin_dac_sample(int agrc, char **agrv){
         rt_dac_device_t dac_dev;
     
         //打開硬件外設
         dac_dev = (rt_dac_device_t)rt_device_find(DAC_DEV_NAME);
         if (dac_dev == RT_NULL) {
             rt_kprintf("can't find %s devicern",DAC_DEV_NAME);
             return -RT_ERROR;
         }
     
         rt_dac_enable(dac_dev, DAC_DEV_CHANNEL);
     
         rt_kprintf("begin echo sin wavern");
     
         for (int i = 0; i < 300; ++i)
         {
             for (int j = 0; j < sizeof(sin_wave_vaule)/sizeof(rt_uint32_t); ++j) {
                 rt_dac_write(dac_dev, DAC_DEV_CHANNEL, sin_wave_vaule[j]);
                 rt_thread_mdelay(1);
             }
         }
     
         rt_kprintf("end echo sin wavern");
     
         return 0;
     }
     
     MSH_CMD_EXPORT(sin_dac_sample,dac out sin wave sample)
     

   • 進行程序編譯，然后燒錄到開發板

4、測試

1. 打開串口工具輸入 ，在finsh 命令行中輸入 sin_dac_sample ，然后回車，現象可看下圖：

到此測試完畢

5、總結

到此 DAC 測試已經完畢，感覺在本次測試下來的很順利，開發速度非常塊，需要簡單的幾個配置，就可以將DAC使用起來。

附錄

sin.py

import numpy as np
import matplotlib.pyplot as plt

t = np.linspace(0,1,512)
y = (np.sin(2*np.pi*t) * 2047) + 2048

count = 0
for num in np.round(y):
    print("%d" % num, end=',')
    count = count +1
    if count % 10 == 0:
        print()


plt.scatter(t,y)
plt.show()

審核編輯 黃宇