dac0832与单片机联接图
dac0832与单片机联接图
DAC0832:DAC0832是8位全MOS中速D/A 改换器,选用R—2RT 形电阻解码网络,改换效果为一对差动电流输出,改换时刻大约为1us。运用单电源+5V―+15V 供电。参看电压为-10V-+10V。在此咱们直接挑选+5V 作为参看电压。DAC0832 有三种作业办法:直通办法,单缓冲办法,双缓冲办法;在此咱们挑选直通的作业办法,将XFER WR2 CS 管脚悉数接数字地。管脚8 接参看电压,在此咱们接的参看电压是+5V。咱们在操控P0口输出数据有规矩的改动将能够发作三角波,锯齿波,梯型波等波形了。
DAC0832与单片机实验板的联接电路图:
源代码:
01.#include <reg51.H>
02.//读取通过DAC0832将数字量改换成仿照量, 并驱动二极管D12由亮骤成为背地里循环改动
03.//而数码管闪现其时改换的数值
04.sbit wela = P2^7; //数码管位选
05.sbit dula = P2^6; //数码管段选
06.sbit dawr = P3^6; //DA写
07.sbit dacs = P3^2; //DA片选
08.
09.unsigned char j, k;
10.//延时函数, 例i=10,则大约延时10ms.
11.void delay(unsigned char i)
12.{
13. for(j = i; j > 0; j--)
14. {
15. for(k = 125; k > 0; k--);
16. }
17.}
18.
19.unsigned char code table[]={0x3f,0x06,0x5b,0x4f,0x66,
20. 0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};//0-F数码管的编码(共阴极)
21.
22.unsigned char count;
23.unsigned char datas[] = {0, 0, 0};
24.void display(unsigned char value)
25.{
26. datas[0] = value / 100;
27. datas[1] = value % 100 / 10;
28. datas[2] = value % 10;
29. for(count = 0; count < 3; count++)
30. {
31. //片选
32. wela = 0;
33. P0 = ((0xfe << count) | (0xfe >> (8 - count))); //挑选第(count + 1) 个数码管
34. wela = 1; //翻开锁存, 给它一个降低沿量
35. wela = 0;
36. //段选
37. dula = 0;
38. P0 = table[datas[count]]; //闪现数字
39. dula = 1; //翻开锁存, 给它一个降低沿量
40. dula = 0;
41. delay(5); //延时5ms, 即亮5ms
42. //铲除段先, 让数码管灭, 去掉对下一位的影响, 去掉高位对低位重影
43. //若想知道影响效果怎样, 可自行去掉此段代码
44. //由于数码管是共阴极的, 悉数灭的代码为: 00H
45. dula = 0;
46. P0 = 0x00; //闪现数字
47. dula = 1; //翻开锁存, 给它一个降低沿量
48. dula = 0;
49. }
50.}
51.
52.unsigned char v, icount;
53.void main()
54.{
55. wela = 0; //封闭数码管
56. dula = 0;
57. dacs = 0; //翻开DA片选
58. v = 255;
59. while(1)
60. {
61. dawr = 0; //向DA写数据
62. P0 = v;
63. dawr = 1; //封闭DA写
64. for(icount = 0; icount < 10; icount++)
65. {
66. display(v);
67. }
68. v--;
69. }
70.}