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標題: 使用單片機+ADC芯片TLC5615時輸出正弦波的頻率提高不上去 [打印本頁]

作者: zqz1345444061 時間: 2021-8-31 15:11
標題: 使用單片機+ADC芯片TLC5615時輸出正弦波的頻率提高不上去
求大佬指點為什么我程序這樣寫最終得到的正弦波頻率只有幾百赫茲

單片機源程序如下:
#include <stc8.h>       //基準電壓是2.515V
#define uint8 unsigned char
#define uint16 unsigned int

sbit CS = P2^4;    //片選
sbit SCLK = P2^2;    //時鐘
sbit DIN = P2^0;    //數據入口

uint16 code tosin[256]={
0x1FF,0x20C,0x218,0x225,0x231,0x23E,0x24A,0x256,0x263,0x26F,0x27B,0x287,0x293,0x29F,0x2AB,0x2B7
,0x2C3,0x2CE,0x2DA,0x2E5,0x2F0,0x2FB,0x306,0x311,0x31B,0x326,0x330,0x33A,0x343,0x34D,0x357,0x360
,0x369,0x371,0x37A,0x382,0x38A,0x392,0x39A,0x3A1,0x3A8,0x3AF,0x3B6,0x3BC,0x3C2,0x3C8,0x3CD,0x3D3
,0x3D8,0x3DC,0x3E1,0x3E5,0x3E8,0x3EC,0x3EF,0x3F2,0x3F5,0x3F7,0x3F9,0x3FB,0x3FC,0x3FD,0x3FE,0x3FE

,0x3FE,0x3FE,0x3FE,0x3FD,0x3FC,0x3FB,0x3F9,0x3F7,0x3F5,0x3F2,0x3EF,0x3EC,0x3E8,0x3E5,0x3E1,0x3DC
,0x3D8,0x3D3,0x3CD,0x3C8,0x3C2,0x3BC,0x3B6,0x3AF,0x3A8,0x3A1,0x39A,0x392,0x38A,0x382,0x37A,0x371
,0x369,0x360,0x357,0x34D,0x343,0x33A,0x330,0x326,0x31B,0x311,0x306,0x2FB,0x2F0,0x2E5,0x2DA,0x2CE
,0x2C3,0x2B7,0x2AB,0x29F,0x293,0x287,0x27B,0x26F,0x263,0x256,0x24A,0x23E,0x231,0x225,0x218,0x20C

,0x1FF,0x1F2,0x1E6,0x1D9,0x1CD,0x1C0,0x1B4,0x1A8,0x19B,0x18F,0x183,0x177,0x16B,0x15F,0x153,0x147
,0x13B,0x130,0x124,0x119,0x10E,0x103,0x0F8,0x0ED,0x0E3,0x0D8,0x0CE,0x0C4,0x0BB,0x0B1,0x0A7,0x09E
,0x095,0x08D,0x084,0x07C,0x074,0x06C,0x064,0x05D,0x056,0x04F,0x048,0x042,0x03C,0x036,0x031,0x02B
,0x026,0x022,0x01D,0x019,0x016,0x012,0x00F,0x00C,0x009,0x007,0x005,0x003,0x002,0x001,0x000,0x000

,0x000,0x000,0x000,0x001,0x002,0x003,0x005,0x007,0x009,0x00C,0x00F,0x012,0x016,0x019,0x01D,0x022
,0x026,0x02B,0x031,0x036,0x03C,0x042,0x048,0x04F,0x056,0x05D,0x064,0x06C,0x074,0x07C,0x084,0x08D
,0x095,0x09E,0x0A8,0x0B1,0x0BB,0x0C4,0x0CE,0x0D8,0x0E3,0x0ED,0x0F8,0x103,0x10E,0x119,0x124,0x130
,0x13B,0x147,0x153,0x15F,0x16B,0x177,0x183,0x18F,0x19B,0x1A8,0x1B4,0x1C0,0x1CD,0x1D9,0x1E6,0x1F2 };

void DA_Conver(uint16 DA_Value) //進行DA轉換，輸入十位DA值，十六位數據，高四位無效，認為0000                                                                                                                      //低二位為00
{
      uint8 i;
      DA_Value <<= 6;
      CS =0;                //片選DA芯片,低電平有效
      SCLK = 0;             //片選低電平，時鐘為上升沿時開始傳送數據
      for(i=0;i<12;i++)       //從高位到地位依次發送
      {
            DIN = (bit)(DA_Value & 0x8000);
            SCLK = 1;
            DA_Value <<= 1;  // 一位一位的進行傳輸
            SCLK = 0;
      }
      CS = 1;    // 關閉芯片，CS的上升沿和下降沿只有在clk為低的時候才有效
      SCLK = 0;
}

void main()
{
      uint16 j;

      P2M0=0x00;
      P2M1=0x00;

      while(1)
      {
            for(j=0;j<255;j++)
            {
                     DA_Conver(tosin[j]); //輸出正弦波
            }
      }
}

作者: lkc8210 時間: 2021-8-31 17:07
你在一個周期內要處里比較/位移/IO輸出等動作 256x12 = 3072次
假設你是用主頻12Mhz 1T的單片機
每次動作耗時1us
一個周期耗時3.072ms => 269Hz
很正常啊~

作者: zqz1345444061 時間: 2021-10-17 19:52

lkc8210 發表于 2021-8-31 17:07
你在一個周期內要處里比較/位移/IO輸出等動作 256x12 = 3072次
假設你是用主頻12Mhz 1T的單片機
每次動作 ...

那有什么方法能夠把頻率提上去嗎

作者: Y_G_G 時間: 2021-10-18 09:28
幾個月了哥們,還在折騰這個?
TLC5615本身的刷新頻率就只有1.21MHZ,你分成256次,最高的頻率也就是4.72KHZ,加上這還是串行通訊,輸出的頻率也就只能是這么高了
想要提高就要用DAC900E這樣的并口DAC

作者: zqz1345444061 時間: 2021-10-19 21:18

Y_G_G 發表于 2021-10-18 09:28
幾個月了哥們,還在折騰這個?
TLC5615本身的刷新頻率就只有1.21MHZ,你分成256次,最高的頻率也就是4.72KHZ, ...

好吧，之前這個問題一直擱置了，這幾天找資料記起來了

歡迎光臨 (http://m.raoushi.com/bbs/)

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