def initPWM(pin):
""" Sets a pin to PWM """
pwm = PWM(pin, 0)
pwm.frequency = 1e3
pwm.duty_cycle = 0
pwm.enable()
return pwm
def initPWM(pin):
pwm = PWM(pin, 0)
pwm.frequency = 1e3
pwm.duty_cycle = 0
pwm.enable()
return pwm
print(mode)
# Open PWM channel 0, pin 32
pins = range(0, 41)
"""
for pin in pins:
try:
pwm = PWM(0, pin)
print("** Channel 0 pin {} works!".format(pin))
except:
print("Pin {} does not work".format(pin))
"""
pwm = PWM(0, 2)
pwm = PWM(0, 0)
#Channel 0 pin 2
# Set frequency to 1 kHz
pwm.frequency = 2e3
# Set duty cycle to 75%
pwm.duty_cycle = 0.25
pwm.enable()
# Change duty cycle to 50%
pwm.duty_cycle = 0.25
time.sleep(5 * 60)
pwm.close()
"""periphery库 PWM测试."""
import time
from periphery import PWM
# 打开 PWM 3, channel 0 ,对应开发板上PWM3外设
try:
pwm = PWM(2, 0)
# 设置PWM输出频率为 1 kHz
pwm.frequency = 1e3
# 设置占空比为 50%
pwm.duty_cycle = 0.50
# 开启PWM输出
pwm.enable()
while True:
for i in range(0, 9):
time.sleep(0.1)
pwm.duty_cycle += 0.05
for i in range(0, 9):
time.sleep(0.1)
pwm.duty_cycle -= 0.05
if pwm.duty_cycle == 0.0:
time.sleep(1)
finally:
pwm.close()