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Added functions for chip status and chip reset. #22

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Added functions for chip status and chip reset. #22

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41 changes: 39 additions & 2 deletions src/examples/spiflash.py
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Original file line number Diff line number Diff line change
Expand Up @@ -10,11 +10,15 @@ class SPIFlash(object):
WECMD = "\x06" # Standard SPI flash write enable command (0x06)
CECMD = "\xc7" # Standard SPI flash chip erase command (0xC7)
IDCMD = "\x9f" # Standard SPI flash chip ID command (0x9F)
STCMD = "\x05" # winbond w25q256 status register
RSTENCMD = "\x66" # winbond w25q256 reset enable command
RSTCMD = "\x99" # winbond w25q256 reset command

ID_LENGTH = 3 # Normal SPI chip ID length, in bytes
ST_LENGTH = 2 # status register-1 length, in bytes
ADDRESS_LENGTH = 3 # Normal SPI flash address length (24 bits, aka, 3 bytes)
BLOCK_SIZE = 256 # SPI block size, writes must be done in multiples of this size
PP_PERIOD = .025 # Page program time, in seconds
PP_PERIOD = .003 # Page program time, in seconds

def __init__(self, speed=FIFTEEN_MHZ):

Expand Down Expand Up @@ -83,6 +87,22 @@ def ChipID(self):
self.flash.Stop()
return chipid

def Status(self):
self.flash.Start()
self.flash.Write(self.STCMD)
chipstatus = self.flash.Read(self.ST_LENGTH)
self.flash.Stop()
return chipstatus

def Reset(self):
print "Sending reset."
self.flash.Start()
self.flash.Write(self.RSTENCMD)
self.flash.Stop()
self.flash.Start()
self.flash.Write(self.RSTCMD)
self.flash.Stop()

def Close(self):
self.flash.Close()

Expand Down Expand Up @@ -123,6 +143,8 @@ def usage():
print "\t-v, --verify Verify data that has been read/written"
print "\t-e, --erase Erase the entire chip"
print "\t-p, --pin-mappings Display a table of SPI flash to FTDI pin mappings"
print "\t-b, Status (busy)"
print "\t-x, Reset"
print "\t-h, --help Show help"
print ""

Expand All @@ -138,7 +160,7 @@ def main():
data = ""

try:
opts, args = GetOpt(sys.argv[1:], "f:s:a:r:w:eipvh", ["frequency=", "size=", "address=", "read=", "write=", "id", "erase", "verify", "pin-mappings", "help"])
opts, args = GetOpt(sys.argv[1:], "f:s:a:r:w:eipvhbx", ["frequency=", "size=", "address=", "read=", "write=", "id", "erase", "verify", "pin-mappings", "help", "status", "reset"])
except GetoptError, e:
print e
usage()
Expand All @@ -158,6 +180,10 @@ def main():
fname = arg
elif opt in ('-i', '--id'):
action = "id"
elif opt in ('-b', '--status'):
action = "status"
elif opt in ('-x', '--reset'):
action = "reset"
elif opt in ('-e', '--erase'):
action = "erase"
elif opt in ('-v', '--verify'):
Expand Down Expand Up @@ -205,6 +231,17 @@ def main():
print ("%.2X" % ord(byte)),
print ""

elif action == "status":

for byte in spi.Status():
print ("%.2X" % ord(byte)),
print ""

elif action == "reset":

spi.Reset()
print "Sent reset."

elif action == "erase":

data = "\xFF" * size
Expand Down