class UpdiNvmProgrammer(object):
"""
NVM programming utility for UPDI
"""
def __init__(self, comport, baud, device):
self.application = UpdiApplication(comport, baud, device)
self.device = device
self.progmode = False
self.logger = logging.getLogger("nvm")
def get_device_info(self):
"""
Reads device info
"""
self.logger.info("Reading device info")
return self.application.device_info()
def enter_progmode(self):
"""
Enter programming mode
"""
self.logger.info("Entering NVM programming mode")
if self.application.enter_progmode():
self.progmode = True
def leave_progmode(self):
"""
Leave programming mode
"""
self.logger.info("Leaving NVM programming mode")
self.application.leave_progmode()
self.progmode = False
def unlock_device(self):
"""
Unlock and erase a device
"""
if self.progmode:
self.logger.info("Device already unlocked")
return
# Unlock
self.application.unlock()
# Unlock after using the NVM key results in prog mode.
self.progmode = True
def chip_erase(self):
"""
Erase (unlocked) device
"""
if not self.progmode:
raise Exception("Enter progmode first!")
return self.application.chip_erase()
def read_flash(self, address, size):
"""
Reads from flash
"""
# Must be in prog mode here
if not self.progmode:
raise Exception("Enter progmode first!")
# Find the number of pages
pages = size // self.device.flash_pagesize
if size % self.device.flash_pagesize:
raise Exception("Only full page aligned flash supported.")
data = []
# Read out page-wise for convenience
for _ in range(pages):
self.logger.info("Reading page at 0x{0:04X}".format(address))
data += (self.application.read_data_words(address, self.device.flash_pagesize >> 1))
address += self.device.flash_pagesize
return data
def write_flash(self, address, data):
"""
Writes to flash
"""
# Must be in prog mode
if not self.progmode:
raise Exception("Enter progmode first!")
# Pad to full page
data = self.pad_data(data, self.device.flash_pagesize)
# Divide up into pages
pages = self.page_data(data, self.device.flash_pagesize)
# Program each page
for page in pages:
self.logger.info("Writing page at 0x{0:04X}".format(address))
self.application.write_nvm(address, page)
address += len(page)
def read_fuse(self, fusenum):
"""
Reads one fuse value
"""
# Must be in prog mode
if not self.progmode:
raise Exception("Enter progmode first!")
address = self.device.fuses_address + fusenum
data = self.application.datalink.ld(address)
return data
def write_fuse(self, fusenum, value):
"""
Writes one fuse value
"""
# Must be in prog mode
if not self.progmode:
raise Exception("Enter progmode first!")
if not self.application.wait_flash_ready():
raise Exception("Flash not ready for fuse setting")
fuse_data = [value]
fuse_address = self.device.fuses_address + fusenum
return self.application.write_fuse(fuse_address, fuse_data)
def pad_data(self, data, blocksize, character=0xFF):
"""
Pads data so that there are full pages
"""
self.logger.info("Padding to blocksize {0:d} with 0x{1:X}".format(blocksize, character))
if len(data) % blocksize > 0:
for _ in range(len(data) % blocksize, blocksize):
data.append(0)
return data
def page_data(self, data, size):
"""
Divide data into pages
"""
self.logger.info("Paging into {} byte blocks".format(size))
total_length = len(data)
result = []
while len(result) < total_length / size:
result.append(data[:size].tolist())
data = data[size:]
return result
def load_ihex(self, filename):
"""
Load from intel hex format
"""
self.logger.info("Loading from hexfile '{}'".format(filename))
from intelhex import IntelHex
ih = IntelHex()
ih.loadhex(filename)
data = ih.tobinarray()
start_address = ih.minaddr()
self.logger.info("Loaded {0:d} bytes from ihex starting at address 0x{1:04X}".format(len(data), start_address))
# Size check
if len(data) > self.device.flash_size:
raise Exception("ihex too large for flash")
# Offset to actual flash start
if start_address < self.device.flash_start:
self.logger.info("Adjusting flash offset to address 0x{:04X}".format(self.device.flash_start))
start_address += self.device.flash_start
return data, start_address
def __init__(self, comport, baud, device):
self.application = UpdiApplication(comport, baud, device)
self.device = device
self.progmode = False
self.logger = logging.getLogger("nvm")