[GD32E231 DIY Contest] 2. Light up a digit of the digital tube

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[GD32E231 DIY Contest] 2. Light up a digit of the digital tube [Copy link]

My project is a digital clock, I want to build one first. I have some time these two days, I went to the electronic parts store and bought four red 1-inch LEDs, with a common cathode. My design is like this, use 8050 to connect the cathode, 8050 base with 1K, and the other end is connected to the single-chip microcomputer. The 8-bit digital tube is connected in series with an 82-ohm resistor, and the other end is connected to the single-chip microcomputer. In order to verify whether it works well, I only used two pins PB3 and PB4, PB3 drives the transistor, and PB4 drives the 8-bit pin. At the beginning, I ran it for a while and it didn't light up. I checked with a multimeter and it was only about 1.25 volts. What's going on? I checked the manual and found that the output can be pulled up. So I changed them all to pull-up output, tried it, and one of the digital tubes lit up The program is as follows:

1. #include "gd32e23x.h" #include "gd32e231c_start.h" #include "systick.h" #include<stdio.h>
3. /*!
4.     \brief      main function
5.     \param[in]  none
6.     \param[out] none
7.     \retval     none
8. */
9. int main(void)
10. {
11.     systick_config();
12.    
13.     /* enable the LED1 GPIO clock */
14.     rcu_periph_clock_enable(RCU_GPIOB);
15.     /* configure LED1 GPIO port */
16.     gpio_mode_set(GPIOB, GPIO_MODE_OUTPUT, GPIO_PUPD_PULLUP, GPIO_PIN_3);
17.     gpio_output_options_set(GPIOB, GPIO_OTYPE_PP, GPIO_OSPEED_50MHZ, GPIO_PIN_3);
18.            gpio_mode_set(GPIOB, GPIO_MODE_OUTPUT, GPIO_PUPD_PULLUP, GPIO_PIN_4);
19.     gpio_output_options_set(GPIOB, GPIO_OTYPE_PP, GPIO_OSPEED_50MHZ, GPIO_PIN_4);
20.     /* reset LED1 GPIO pin */
21.     gpio_bit_set(GPIOB,GPIO_PIN_3);
23.     while(1){
24.         /* turn on LED1 */
25.         gpio_bit_set(GPIOB,GPIO_PIN_4);
26.         delay_1ms(1000);
27.         /* turn off LED1 */
28.         gpio_bit_reset(GPIOB,GPIO_PIN_4);
29.         delay_1ms(1000);
30.     }
31. }

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连线有点麻烦，正考虑打个板来这。

月下良缘

Thanks for sharing!