MCP3201 ADC Learning Notes - Part 1 (Memory Refreshing Notes)

MCP3201 ADC Learning Notes - Part 1 (Memory Refreshing Notes)

# spi_test05 tlfong01 2019apr07hkt2043 ***

# Computer = Rpi3B+

# Linux    = $ hostnamectl = raspberrypi Raspbian GNU/Linux 9 (stretch) Linux 4.14.34-v7+ arm 

# Python   = >>> sys.version = 3.5.3 Jan 19 2017

# Test 1   - repeatSendByte() - SPI port repeatedly send out single bytes.  

# Function - Repeat many times sending a byte, pause after each byte.

# Test 2   - loopBackTest()   - SPI port send and receive one byte.

# Function - Send one byte to MSOI and read it back from MISO. 

# Setup    - Connet MOSI pin to MISO pin to form a loop.

from   time import sleep

import spidev

spiPort0 = spidev.SpiDev()

spiPort0.open(0,0)

spiPort0.max_speed_hz = 100000

def spiSendRecvOneByte(spiPort, sendByte):

    sendByteArray = [sendByte]

    recvByteArray = spiPort.xfer(sendByteArray)    

    return recvByteArray

def repeatSendOneByte(spiPort, sendByte, pauseTimeBetweenBytes, repeatCount):

    print('\nBegin repeatSendByte(),....')

    for i in range(repeatCount):

        spiSendRecvOneByte(spiPort, sendByte)

        sleep(pauseTimeBetweenBytes)

    print('End   repeatSendByte().')

    return

def loopBackOneByte(spiPort, sendByte):

    recvByteArray     = spiSendRecvOneByte(spiPort, sendByte)

    recvByte          = recvByteArray[0]

    print('\nBegin testLoopbackOneByte(),....')

    #print('')

    print('      sendByte  = ', hex(sendByte))

    print('      recvByte  = ', hex(recvByte))

    #print('')

    print('End   testLoopbackOneByte(),....')

    return

def testRepeatSendOneByte():

    repeatSendOneByte(spiPort0, 0x5b, 0.0001, 20000000)

    return

def testLoopbackOneByte():

    loopBackOneByte(spiPort0, 0x5b)

    return

testRepeatSendOneByte()

#testLoopbackOneByte()

''' Smple output tlfong 01 2019apr07hkt2047

Begin testLoopbackOneByte(),....

      sendByte  =  0x5b

      recvByte  =  0x5b

End   testLoopbackOneByte(),....

'''

# *** End ***

.END

jj