V831

Preface

Learn before 831 When ,io There is always something wrong with your mouth , Later, a new image was updated , It should be the official bug Repair the

One 、GPIO

GPIO, Full name General-Purpose Input/Output（ General input output ）, It is a general pin that can be configured and controlled dynamically during software running . be-all GPIO The initial state after power on is input mode , It can control the output of the level and obtain the level change of the peripheral .

Two 、 Buzzer

Over control GPIO Output high and low levels , Before using, you need to load the corresponding board GPIO To configure . By viewing the pin definition diagram of the development board , Determine what you are using IO Pin number , For example, the following is MaixII-Dock Of GPIO PH6 Pin , You need to use gpio.gpio(6, “H”, 1), Define , The complete code is as follows ：

import time
from maix import gpio
beep = gpio.gpio(6, "H", 1)
while True:
    beep.set_value(0)
    print(beep.get_value())
    time.sleep(0.5)
    beep.set_value(1)
    print(beep.get_value())
    time.sleep(0.5)
beep.release()

Then you can hear the buzzer ring , The same code as before , But it just doesn't ring .

3、 ... and 、 Key

take GPIO Set to input mode , To get the level change of the board . Need to be in GPIO Add one more parameter when instantiating , To set up GPIO The pattern of .

key = gpio.gpio(6, "H", 1, line_mode = 2)#2  Set to input mode , This parameter defaults to  1, Output mode 

GPIO It needs to be released after use , Otherwise, it will be occupied , adopt gpio.release() Release GPIO Or use a class to encapsulate , The complete code is as follows ：

import time
class BUTTON:
    def __init__(self, line, bank, chip=1, mode=2):
        from maix import gpio
        self.button = gpio.gpio(line, bank, chip, mode)
    def is_pressed(self):
        if self.button.get_value() != 1:
            return True
    def __del__(self):
        self.button.release()

global key
key = BUTTON(6, "H")
print(key.button.source)

Check whether the key is pressed

while True:
    if key.is_pressed():
        print("pressed!!")