def initPWM(pin):
""" Sets a pin to PWM """
pwm = PWM(pin, 0)
pwm.frequency = 1e3
pwm.duty_cycle = 0
pwm.enable()
return pwm
def __init__(self, pin):
# Check if the pin is valid
super(HPWMPeriphery, self).__init__(pin)
if PWM is None:
raise ImportError("Failed to import PWM from periphery.")
self._pwm = PWM(self._chip, self._SELECTED_COMB.index(pin))
def prepare(self) -> None:
logger = get_logger(0)
for (pin, initial) in self.__channels.items():
try:
logger.info("Probing pwm chip %d channel %d ...", self.__chip,
pin)
pwm = PWM(self.__chip, pin)
self.__pwms[pin] = pwm
pwm.period_ns = self.__period
pwm.duty_cycle_ns = self.__get_duty_cycle(bool(initial))
pwm.enable()
except Exception as err:
logger.error("Can't get PWM chip %d channel %d: %s",
self.__chip, pin, tools.efmt(err))
def __init__(self, pin, freq=None, range=None, threshold=0.01, debug=False):
"""
親クラスのコンストラクタ処理後、指定のピンに対しPWM出力ピンとして設定を行う。
初期値としてPWMサイクル値をゼロに指定する。
引数：
pin int PWM番号、必須(1～3)
freq int PWM Frequency値（Hz）
range int PWMサイクル値の範囲(25から40,000までの整数)
threshold float 入力値を0として認識するしきい値(-threshold < value< threshold => 0)
"""
super().__init__(pin, mode=OUT, debug=debug)
self.freq = freq or DEFAULT_FREQ
self.threshold = threshold
if self.pin == 1:
self.chip_number = 0
self.channel_number = 0
elif self.pin == 2:
self.chip_number = 1
self.channel_number = 0
elif self.pin == 3:
self.chip_number = 2
self.channel_number = 0
else:
raise ValueError('[PERIPHERY_PWM] pwm:{} is out of range(1.. 3)'.format(str(self.pin)))
try:
from periphery import PWM
except ImportError:
exit('[PERIPHERY_PWM] This code requires periphery package')
self.gpio = PWM(self.chip_number, self.channel_number)
self.gpio.frequency = self.freq
self.gpio.duty_cycle = 0
self.gpio.enable()
self.run(0)
if self.debug:
print('[PERIPHERY_PWM] pwm:{} set freq:{}/dutycycle:{}, enabled and set value 0'.format(
str(self.pin), str(self.freq), str(self.gpio.duty_cycle)))
def initPWM(pin):
pwm = PWM(pin, 0)
pwm.frequency = 1e3
pwm.duty_cycle = 0
pwm.enable()
return pwm
# set GPIO mode to BOARD
GPIO.setmode(GPIO.BOARD)
mode = GPIO.getmode()
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)
"""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()
GPIO.setmode(GPIO.BOARD)
mode = GPIO.getmode()
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)
#Channel 0 pin 2
# Set frequency to 1 kHz
pwm.frequency = 1e3
# Set duty cycle to 75%
pwm.duty_cycle = 0.5
pwm.enable()
# Change duty cycle to 50%
pwm.duty_cycle = 0.50
time.sleep(5 * 60)
