Raspberry Pi picoでSPI接続のADT7310をMicroPythonで使う

from machine import Pin
from machine import SPI
import utime

MISO = Pin(16)   # GPIO16 (21番ピン)
CS   = Pin(17)   # GPIO17 (22番ピン)
SCK  = Pin(18)   # GPIO18 (24番ピン)
MOSI = Pin(19)   # GPIO19 (25番ピン)

class test_ADT7310:

    def __init__(self):
        self.ss=CS
        # クロック125kHz SPI_MODE3 MSBFIRST
        self.spi01=SPI(0,baudrate=125000,polarity=1,phase=1,bits=8,firstbit=SPI.MSB,mosi=MOSI,miso=MISO,sck=SCK)

    def spi_cs_on(self):
        self.ss.value(0)

    def spi_cs_off(self):
        self.ss.value(1)

    def start(self):

        self.spi_cs_off()
        buff=bytearray([0xff,0xff,0xff,0xff])
        self.spi_cs_on()
        self.spi01.write(buff)
        self.spi_cs_off()
        utime.sleep(0.1)

        while (1):

            # 16bit 1-shot
            buff=bytearray([0x08,0xa0])

            # 13bit 1-shot
            #buff=bytearray([0x08,0x20])

            self.spi_cs_on()
            self.spi01.write(buff)
            self.spi_cs_off()

            read_wait_time = utime.ticks_ms()
            read_wait = 23
            utime.sleep(0.01*read_wait)

            count001 = 0;
            while True:
                # ステータスレジスタの読み込み
                utime.sleep(0.01)
                buff=bytearray([0x40])
                self.spi_cs_on()
                self.spi01.write(buff)
                status_reg = bytearray(self.spi01.read(1,0x00))
                self.spi_cs_off()
                count001 += 1
                if count001 >= 500:
                    break
                if ((status_reg[0] >> 7) & 1) == 0:
                    break

            status_str = "status=0x{0:02x}, count001={1:d}, {2:d} ms".format(status_reg[0], count001, (utime.ticks_ms()-read_wait_time))
            #print(status_str)

            buff=bytearray([0x50])
            self.spi_cs_on()
            self.spi01.write(buff)
            temp_raw = bytearray(self.spi01.read(2,0x00))
            self.spi_cs_off()

            # 16bitの計算
            temp = (temp_raw[0]*256+temp_raw[1])
            if temp >= 32768:
                temp - 65536
            temp = temp / 128
            print("temp : {0:.4f} degC".format(temp))

            # 13bitの計算
            #temp = (temp_raw[0]*256+temp_raw[1])/8
            #if temp >= 4096:
            #    temp - 8192
            #temp = temp / 16
            #print("temp : {0:.4f} degC".format(temp))

            utime.sleep(5.0)

if __name__=="__main__":
    test_adt7310_03 = test_ADT7310()
    test_adt7310_03.start()