【AT-START-F403A Review】+A/D Waveform Drawing

jinglixixi

【AT-START-F403A Review】+A/D Waveform Drawing [Copy link]

 

 

With the display capability of the 2.2' TFT screen, the data obtained by A/D conversion can be intuitively displayed in the form of a waveform. Taking the acquisition of the internal temperature sensor as an example, the temperature curve drawn is shown in the figure below, and the temperature fluctuation value is about 1 degree.

Chip internal temperature change curve

The key procedures to achieve this function are as follows:

 POINT_COLOR=RED;
 BACK_COLOR=WHITE;
 i=0;
 LCD_ShowCharh(20,130,'t',0);
 LCD_ShowCharh(20,120,'=',0);
 LCD_ShowCharh(20,80,'C',0);
 while (1)
 {
 Delay_sec(1);
  t=(uint16_t)(( 1.26 -(double)ADCConvertedValue*ADC_VREF/4096)/(-0.00423) +25);
 LCD_ShowNum(20,100,t,2);
      sj=t*2;
 if(i==0) sp=sj;
       LCD_DrawLine(220-sp, 300-4*(i-1), 220-sj, 300-4*(i));
       sp=sj;
 if(i<72) i++;
 else
 {
 LCD_Clear(WHITE);
 LCD_DrawLine(10, 304, 220, 304);
 LCD_DrawLine(60, 10, 60, 304);
 LCD_DrawLine(100, 10, 100, 304);
 LCD_DrawLine(140, 10, 140, 304);
 LCD_DrawLine(180, 10, 180, 304);
 LCD_DrawLine(220, 10, 220, 304);
 LCD_ShowCharh(20,170,'A',0);
      LCD_ShowCharh(20,162,'/',0);
     LCD_ShowCharh(20,154,'D',0);
 LCD_ShowCharh(20,130,'t',0);
      LCD_ShowCharh(20,120,'=',0);
 LCD_ShowCharh(20,80,'C',0);
 i=0;
 }
       Delay_ms(200);
 }

If you switch the acquisition program to other channels, you can observe the changes in the corresponding analog signal. In addition, you can also observe the signals of multiple channels synchronously.

okhxyyo

This is interesting

jinglixixi

okhxyyo posted on 2020-10-22 08:53 This is interesting

Thanks for the encouragement!!!

w494143467

This drawing is pretty good. What is the ADC acquisition frequency?

jinglixixi

w494143467 posted on 2020-10-22 12:45 This drawing is pretty good. What is the ADC acquisition frequency?

Without professional tools such as oscilloscopes, the theoretical values are as follows:

w494143467

0.5us? 200MHz? That ADC has pretty good performance.

jinglixixi

w494143467 posted on 2020-10-22 15:02 0.5us? 200MHz? That ADC has good performance.

Given the information, it probably won't be too different.

jinglixixi

w494143467 posted on 2020-10-22 15:02 0.5us? 200MHz? That ADC has good performance.

About 2MHz

w494143467

jinglixixi posted on 2020-10-22 16:44 About 2MHz

There should be some other calculations, but it is also very good. 2M can meet normal needs

jinglixixi

yes!

freebsder

1° This range is a bit large.

jinglixixi

freebsder posted on 2020-10-23 22:35 1° This range is a bit large.

It can also be understood that after all, in the internal environment, the unevenness of the instantaneous work is ups and downs. I have seen the energy consumption waveform of SLSTK3301A, which is beautiful and as standard as the pulse waveform.

数码小叶

w494143467 posted on 2020-10-22 15:02 0.5us? 200MHz? That ADC has good performance.

200MHz......Your calculation is correct . The program processing logic should not even reach 100K effect when drawing.

数码小叶

Good idea. This is the first time I have seen such a way of playing with the internal temperature sensor . The temperature difference is 1 degree. I think it should be due to the conversion.

w494143467

Digital Leaf published on 2020-10-26 10:27 200MHz......You calculated that, this program processes the logic, and the actual drawing should not reach the effect of 100K

Haha, I am just talking about ADC acquisition. If you add drawing, the frequency will definitely be low.

jinglixixi

This is the internal temperature collected using the serial port