import time,logging,numpy as np,struct
logger = logging.getLogger(__name__)
[docs]class EEP24XX64:
"""
64 Kbit Electrically Erasable PROM
"""
size = (1<<13)
[docs] def __init__(self, itf, addr=0x51):
self.itf = itf
self.addr = addr
[docs] def read(self,reg,length=1):
"""
Read byte(s) out of ROM
.. code-block:: python
read(0) # read a byte out from address 0 of the ROM
read(0x20,16) # read 200 bytes from address 0x20 to 0x2f
"""
if reg < 0 or reg >= self.size or reg + length > self.size:
raise ValueError('Invalid parameter')
regaddrmsb = (reg & 0x1f00) >> 8
regaddrlsb = reg & 0x00ff
return self.itf.read(self.addr,[regaddrmsb,regaddrlsb],length)
[docs] def write(self,reg,data):
"""
Write byte(s) into ROM
.. code-block:: python
write(0,0xff) # write 0xff to address 0x00
write(0x10,range(8192)) # write range(8192) to address from 0x10 to 0x1fff
"""
if reg < 0 or reg >= self.size or reg + len(data) > self.size:
raise ValueError('Invalid parameter')
while reg & 0xffe0 != (reg + len(data) - 1) & 0xffe0:
length = (reg | 0x001f) - reg + 1
regaddrmsb = (reg & 0x1f00) >> 8
regaddrlsb = reg & 0x00ff
self.itf.write(self.addr,[regaddrmsb,regaddrlsb],data[0:length])
data = data[length:]
reg = (reg&0xffe0) + (0b1<<5)
time.sleep(0.01)
if len(data)>0:
regaddrmsb = (reg & 0x1f00) >> 8
regaddrlsb = reg & 0x00ff
self.itf.write(self.addr,[regaddrmsb,regaddrlsb],data)
[docs] def writeString(self,chars):
"""
Write a string into the ROM
Write the input string into the ROM. Only ASCII characters are allowed
A character of '\0' will be appended to the string to indicate the end
of the string.
.. code-block:: python
writeString('Haha')
"""
if len(chars)+1 > self.size:
raise ValueError('Invalid parameter')
byteList=bytearray(chars+'\0')
byteList=[b for b in byteList]
self.write(0,byteList)
[docs] def readString(self):
"""
Read a string out of the ROM
Read byte(s) and intepret as ASCII character(s). Expect a '\0' at the
end of the string
"""
data=[]
for i in range(0,self.size,256):
data += self.read(i,256)
if 0 in data:
data=data[0:data.index(0)]
break
return str(bytearray(data))