[AB32VG1 Development Board Review] RGB_LED Color Change Display

jinglixixi

[AB32VG1 Development Board Review] RGB_LED Color Change Display [Copy link]

 

The AB32VG1 development board has an RGB_LED on board, and its schematic diagram is shown in Figure 1.

Figure 1 RGB_LED circuit connection

According to the principle of color superposition, yellow, bright blue, pink and white can be combined.

The procedure to achieve the color change effect is as follows:

int main(void)
{
 uint32_t cnt = 0;
 uint8_t pin = rt_pin_get("PE.1");
 rt_pin_mode(pin, PIN_MODE_OUTPUT);
 uint8_t pin1 = rt_pin_get("PE.4");
 rt_pin_mode(pin1, PIN_MODE_OUTPUT);
 uint8_t pin2 = rt_pin_get("PA.1");
 rt_pin_mode(pin2, PIN_MODE_OUTPUT);
 rt_pin_write(pin, PIN_HIGH);
 rt_pin_write(pin1, PIN_HIGH);
 rt_pin_write(pin2, PIN_HIGH);
 while (1)
 {
 if(cnt % 8 == 0)
 {
 rt_pin_write(pin, PIN_LOW);
 rt_pin_write(pin1, PIN_HIGH);
 rt_pin_write(pin2, PIN_HIGH);
 }
 if(cnt % 8 == 1)
 {
 rt_pin_write(pin, PIN_HIGH);
 rt_pin_write(pin1, PIN_LOW);
 rt_pin_write(pin2, PIN_HIGH);
 }
 if(cnt % 8 == 2)
 {
 rt_pin_write(pin, PIN_HIGH);
 rt_pin_write(pin1, PIN_HIGH);
 rt_pin_write(pin2, PIN_LOW);
 }
 if(cnt % 8 == 3)
 {
 rt_pin_write(pin, PIN_LOW);
 rt_pin_write(pin1, PIN_LOW);
 rt_pin_write(pin2, PIN_HIGH);
 }
 if(cnt % 8 == 4)
 {
 rt_pin_write(pin, PIN_HIGH);
 rt_pin_write(pin1, PIN_LOW);
 rt_pin_write(pin2, PIN_LOW);
 }
 if(cnt % 8 == 5)
 {
 rt_pin_write(pin, PIN_LOW);
 rt_pin_write(pin1, PIN_HIGH);
 rt_pin_write(pin2, PIN_LOW);
 }
 if(cnt % 8 == 6)
 {
 rt_pin_write(pin, PIN_LOW);
 rt_pin_write(pin1, PIN_LOW);
 rt_pin_write(pin2, PIN_LOW);
 }
 if(cnt % 8 == 7)
 {
 rt_pin_write(pin, PIN_HIGH);
 rt_pin_write(pin1, PIN_HIGH);
 rt_pin_write(pin2, PIN_HIGH);
 }
 cnt++;
 rt_thread_mdelay(1000);
 }
 return 0;
}

Figure 2 Demonstration effect diagram

dcexpert

The effect is good. I feel that the program can be optimized. Instead of writing 8 if statements, the LED status can be set according to each binary bit of cnt, so only 3 if statements are needed.

annysky2012

The effect is good. I feel that the program can be optimized. Instead of writing 8 if statements, the LED state can be set according to each binary bit of cnt, so only 3 if statements are needed.

Makes sense!

jinglixixi

dcexpert posted on 2021-8-12 09:37 The effect is good. I feel that the program can be optimized. Instead of writing 8 if statements, the LED status can be set according to each binary bit of cnt. In this way, only 3 if statements are needed...

Makes sense, I'll try it again.

freebsder

Why don't we put three adjacent pins for better control?

jinglixixi

freebsder posted on 2021-8-12 17:15 Why don't we put three adjacent pins for better control?

It's hard to say. I think it may be related to the design of the Arduino interface. PE1 and PE4 are on the same side of the chip, but they are separated from CLK and SDA. PA1 may be the result of the pin allocation according to the Arduino interface to keep these three pins as PWM pins. My analysis may not be accurate.