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Added checksum calculator option for microcontroller. #1

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Added checksum calculator option for microcontroller. #1

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39 changes: 36 additions & 3 deletions lpc17prl.lua
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Original file line number Diff line number Diff line change
Expand Up @@ -11,7 +11,7 @@ local usage_str = string.format([=[
Usage:
%s
[-vqi] [-O[no-]<option>[=<value>]] [-l <lua-file>]
[-W|-R|-V <file-name>] [-P|-T|-E|-B|-I|-h]
[-W|-R|-V|-X|-XW <file-name>] [-P|-T|-E|-B|-I|-h]
]=], arg[0])

local help_str = [=[
Expand All @@ -26,6 +26,8 @@ Modes:
-W Write flash (default)
-R Read flash
-V Verify
-X Calculate and write checksum
-XW Calculate checksum and write flash
without <file-name>:
-P Probe for chip ID (default without -i)
-T Terminal (default for -i)
Expand Down Expand Up @@ -77,6 +79,7 @@ local opts = {
baudrate = 115200,
serial = "",
product = "SEPACK-NXP",
write_after = false,
}

function parsekeyopt(s)
Expand All @@ -99,20 +102,23 @@ function parsekeyopt(s)
end

do
for o, a in os.getopt(arg, 'qvcihl:WRVPTEBIO:') do
for o, a in os.getopt(arg, 'qvcihl:WRVPTEBIXO:') do
if o == 'q' then opts.verbose = opts.verbose - 1
elseif o == 'v' then opts.verbose = opts.verbose + 1
elseif o == 'i' then opts.interactive = true
elseif o == 'c' then opts.clean = true
elseif o == 'l' then opts.customcode = a
elseif o == 'W' then opts.mode = 'write'
elseif o == 'W' then
if opts.mode == 'calculate' then opts.write_after = true end
opts.mode = 'write'
elseif o == 'R' then opts.mode = 'read'
elseif o == 'V' then opts.mode = 'verify'
elseif o == 'P' then opts.mode = 'probe'
elseif o == 'T' then opts.mode = 'terminal'
elseif o == 'E' then opts.fullerase = true
elseif o == 'B' then opts.mode = 'blank-check'
elseif o == 'I' then opts.mode = 'isp'
elseif o == 'X' then opts.mode = 'calculate'
elseif o == 'h' then help()
elseif o == 'O' then
local a, v = parsekeyopt(a)
Expand Down Expand Up @@ -150,6 +156,33 @@ if opts.verbose > 3 then
D.blue'opts:'(opts)
end

if opts.mode == 'calculate' or opts.write_after then
if not opts.fname then D.abort(2, "Binary file not provided") end

local f, err = io.open(opts.fname, "r+b")
if not f then D.abort(2, "Cannot open input file: "..opts.fname..": "..err) end

local sum = 0

for byteno=1,7 do
local bytes = f:read(4)
local int32 = B.dec32LE(bytes)
sum = sum + int32
end

sum = -sum

f:seek("set", 28) -- ensure that we are writing checksum in correct place
f:write(B.enc32LE(sum))
D.green'Checksum stored'()
f:close()

if opts.write_after then opts.mode = 'write'
else os.exit()
end

end

if opts.mode == 'write' or opts.mode == 'verify' then
if not opts.fname then
D.abort(1, "error: no file name given")
Expand Down