def read(a):
command([0x03] + addr24(a))
while True:
ids = struct.unpack("BBB", idcode())
print("Got JEDEC ID: %02x %02x %02x" % ids)
if ids[0] not in (0x00, 0xff) and (8 <= ids[2] < 22):
break
size = 1 << ids[2]
print("Flash size is %d bytes" % size)
if '-r' in optdict:
read(0)
chunk = 8 * 1024
with open(optdict['-r'], "wb") as f:
for a in range(0, size, chunk):
f.write(s.read(chunk))
print("%d/%d KBytes" % (a / 1024, size / 1024))
if '-w' in optdict:
write_enable()
command([0xc7])
wait_ready()
with open(optdict['-w'], "rb") as f:
for a in range(0, size, 256):
page_program(a, f.read(256))
print("%d/%d KBytes" % (a / 1024, size / 1024))
s.unsel()
s.seta(1)
s.detach()
def page_program(a, b256):
# print('page_program', a)
write_enable()
command([0x02] + addr24(a))
s.write(b256)
wait_ready()
def erase_sector(a):
# print('erase sector', a)
write_enable()
command([0xd8] + addr24(a))
wait_ready()
ids = struct.unpack("BBB", idcode())
if ids != (0x20, 0xba, 0x16):
print("Unexpected JEDEC ID: %02x %02x %02x" % ids)
sys.exit(1)
bin = open(sys.argv[1], "rb").read()
t0 = time.time()
for a in range(0, len(bin), 256):
if (a & 0xffff) == 0:
erase_sector(a)
page_program(a, bin[a:a + 256])
print("flash load took %.2f s" % (time.time() - t0))
s.unsel()
s.seta(1) # Let the FPGA boot
s.detach() # Release the SPI signals