atm90e26_esp32.py

gistfile1.txt

import machine
import time

SysStatus = 0x01 #System Status

sck = machine.Pin(5,machine.Pin.OUT)
mosi = machine.Pin(18,machine.Pin.OUT)
miso = machine.Pin(19,machine.Pin.IN)
cs1 = machine.Pin(15,machine.Pin.OUT)
cs2 = machine.Pin(33,machine.Pin.OUT)

spi = machine.SPI(1,baudrate=200000,bits=8,polarity=1,phase=1,firstbit=machine.SPI.MSB,sck=sck,mosi=mosi,miso=miso)

while True:
	cs1.value(0)
	spi.write(bytearray([0x81]))
	time.sleep_us(4)
	val = spi.read(2)
	print(val)
	cs1.value(1)
	time.sleep_ms(100)
	

while True:
	val = commatm90(True,SysStatus,0x0000,cs2)
	print(val)
	time.sleep_ms(100)

def commatm90(bool rw,int address,int val,machine.Pin cs):
    #switch MSB and LSB of value
	buf = bytearray(2)
	#use struct ?
	buf[0] = val>>8
	buf[1] = val<<8
    
    #Set read write flag
    address|=RW<<7
	address=address.to_bytes(1,'big')
    cs.value(0)
    time.sleep_us(10)
    spi.write(bytearray([address]))
    ''' Must wait 4 us for data to become valid '''
    time.sleep_us(4)

    #Read data
    #Do for each byte in transfer
    if(RW):
		buf = spi.read(2)
    else:
	    spi.write(buf)             # write all the bytes
    
    cs.value(1)
        
    output=(buf[1]>>8)|(buf[0]<<8) #reverse MSB and LSB
    return output