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# -*- coding: utf-8 -*-
#********************************************************************************
#Copyright © 2020 Wcq
#File Name: eeprom_rw.py
#Author: Wcq
#Email: wcq-062821@163.com
#Created: 2020-05-28 19:42:47
#Last Update: 2022-09-27 18:37:32
# By: Wcq
#Description:
#********************************************************************************
import os, sys
from mpsse import *
from time import sleep
from myprint import *
import sys
import argparse
devINFO = {
# Name : [AddrSize, pageSIZE],
'24C01' : [7, 16],
'24C02' : [8, 16],
'24C04' : [9, 16],
'24C08' : [10, 16],
'24C16' : [11, 16],
'24C32' : [12, 32],
'24C64' : [13, 32],
'24C128' : [14, 64],
'24C256' : [15, 64],
'24C512' : [16, 128],
'24C1024': [17, 256],
}
class I2CRW:
RCMD = None # Read command
WCMD = None
RAddressList = [0xA1]
testRCMD = None # Read command
reTryCnt = 0
i2c = None
byteSIZE = 0
pageSIZE = 0
addrBYTES = 0
def __init__(self, customAddr=False):
testAddrList = []
if customAddr:
testAddrList.append(customAddr)
else:
testAddrList.extend(self.RAddressList)
try:
self.i2c = MPSSE(I2C, FOUR_HUNDRED_KHZ)
print ("%s initialized at %dHz (I2C)" % (self.i2c.GetDescription(), self.i2c.GetClock()))
self.i2c.PinLow(GPIOL3) #3V3 ON
except OSError as e:
raise TypeError("MPSSE failure")
for testADDR in testAddrList:
for i in range(5):
self.testRCMD = testADDR # Read command
data = self.i2cRead(25)
if len(data):
# hexPrint('data: ', data, 1)
break
if self.RCMD is not None:
break
else:
raise Warning('device no responses!')
sleep(0.3)
def tryI2cRead(self, lens):
self.i2c.Start()
if self.RCMD:
self.i2c.Write(bytes([self.RCMD]))
else:
self.i2c.Write(bytes([self.testRCMD]))
if self.i2c.GetAck() == ACK:
self.i2c.SendAcks()
data = list(self.i2c.Read(lens-1))
self.i2c.SendNacks()
data.extend(list(self.i2c.Read(1)))
self.i2c.Stop()
self.reTryCnt = 0
return bytes(data)
else:
self.i2c.Stop()
return False
def i2cRead(self, lens):
while True:
readData = self.tryI2cRead(lens)
if readData:
#read success, set WCMD and RCMD if they are None
if self.RCMD is None:
self.RCMD = self.testRCMD
print('self.RCMD : 0x%X'%self.RCMD)
if self.WCMD is None:
self.WCMD = self.RCMD - 1
print('self.WCMD : 0x%X'%self.WCMD)
return readData
else:
self.reTryCnt += 1
if self.reTryCnt > 20 and (self.RCMD is None):
self.reTryCnt = 0
print('test I2C Address 0x%X'%self.testRCMD)
return []
def i2cWrite(self, wbuf):
self.i2c.Start()
self.i2c.Write(wbuf)
if self.i2c.GetAck() == ACK:
self.i2c.Stop()
return 0
else:
raise Exception("In Write Received write command NACK!")
def i2cWriteNoStop(self, wbuf):
self.i2c.Start()
self.i2c.Write(wbuf)
if self.i2c.GetAck() == ACK:
return 0
else:
raise Exception("In Write Received write command NACK!")
def i2cWriteAndRead(self, wbuf, readCnt, label, sleepTime):
self.i2cWriteNoStop(wbuf)
# hexPrint('%s Sent : '%label, wbuf, 1)
sleep(sleepTime)
recv_buf = self.i2cRead(readCnt)
# hexPrint('received %s data : 0x%X '%(label, self.RCMD), recv_buf, 1)
return recv_buf
def i2cClose(self):
self.i2c.close()
def eepromRead(self, addr, num_bytes):
wbuf = []
wbuf.append(self.WCMD)
wbuf.extend(addr.to_bytes(self.addrBYTES, "big"))
return self.i2cWriteAndRead(bytes(wbuf), num_bytes, 'Read addr : 0x%08X : '%addr, 0)
def eepromWrite(self, addr, write_buf):
chunked_list = [write_buf[i:i+self.pageSIZE] for i in range(0, len(write_buf), self.pageSIZE)]
write_add = addr
for wb in chunked_list:
wbuf = []
wbuf.append(self.WCMD)
wbuf.extend(write_add.to_bytes(self.addrBYTES, "big"))
wbuf.extend(wb)
self.i2cWrite(bytes(wbuf))
write_add += len(wb)
sleep(0.01)
# hexPrint('wbuf: ', wbuf, 1)
# print('write addr : 0x%08X finished'%addr)
if __name__ == '__main__':
parser = argparse.ArgumentParser(description="read write eeprom 24c04")
parser.add_argument('-r', help='read eeprom and save file', default = None)
parser.add_argument('-w', help='write file to eeprom', default = None)
parser.add_argument('-d', help='device type e.g. 24c04', default = '24c04')
args = parser.parse_args()
if (len(sys.argv) < 2):
print('python %s -h :to get useage'%sys.argv[0])
read_file = args.r
write_file = args.w
device_type = args.d
try:
device_size = devINFO[device_type.upper()]
except:
print('device_type error please select device from below table')
print('********************************************************************************')
for dev in devINFO.keys():
print('device : %08s '%(dev))
print('********************************************************************************')
exit(-1)
print('********************************************************************************')
print('device_type : ', device_type.upper())
print('********************************************************************************')
i2cRW = I2CRW()
i2cRW.byteSIZE = 2**devINFO[device_type.upper()][0]
i2cRW.pageSIZE = devINFO[device_type.upper()][1]
i2cRW.addrBYTES = (devINFO[device_type.upper()][0] + 7) // 8
if read_file:
recvBuf = i2cRW.eepromRead(0, i2cRW.byteSIZE- 128)
with open(read_file, 'wb') as fpw:
fpw.write(bytes(recvBuf))
elif write_file:
with open(write_file, 'rb') as fpr:
buf = list(fpr.read())
i2cRW.eepromWrite(0, buf)
sleep(0.01)
recvBuf = i2cRW.eepromRead(0, len(buf))
sleep(0.01)
if (bytes(buf) != recvBuf):
print('write error')
hexPrint('write_buf : ', buf, 1)
hexPrint('recvBuf : ', recvBuf, 1)
exit(0)
# print('\rwriting addr 0x%08X %d%%'%(i, i*100//device_size), end='')
# print('\rwriting addr 0x%08X %d%%'%(device_size, 100))
else:
print('error')
print('All Done')
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