Uart for 20190610 micropython #258

import sys
import time
import socket
import machine

UART_BAUD = 115200

# defaule use SIM800L_IP5306_VERSION_20190610
MODEM_POWER_PIN 	= 23
MODEM_RST 			= 5
MODEM_PWRKEY_PIN 	= 4
MODEM_TX 			= 27
MODEM_RX 			= 26
LED_PIN 			= 13

# Power on the GSM module
GSM_POWER = machine.Pin(MODEM_POWER_PIN, machine.Pin.OUT)
GSM_POWER.value(1)

LED = machine.Pin(LED_PIN, machine.Pin.OUT)
LED.value(1)


GSM_PWR = machine.Pin(MODEM_PWRKEY_PIN, machine.Pin.OUT)
GSM_PWR.value(1)
time.sleep_ms(200)
GSM_PWR.value(0)
time.sleep_ms(1000)
GSM_PWR.value(1)

modem  = machine.UART(1, 115200, tx=MODEM_RX, rx=MODEM_TX)


def send_at(command):
        """
        Send an AT command to the modem
        :param command: str: the at command to send
        :return:
        """
        command = command + '\r'
        modem.write(bytes(command, 'utf-8'))
  

def reader():
    while True:
        if modem.any():
            try:
                line = modem.readline()
            except Exception as e:
                log("Error reading uart {}".format(str(e)))
                continue

            log(f'"{line}"')
            break
        
        
if __name__ == "__main__":
    send_at('ati')
    reader()