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--Digilines Memory Example
--Connect an EEPROM or SRAM chip on channel "memory"
--Enter "help" in the terminal for a command list
local function runcmd(command)
if command ~= "" then
print(" "..command,true)
print()
end
if string.sub(command,1,4) == "read" then
local address = string.sub(command,6,7)
if string.sub(address,2,2) == " " then address = string.sub(address,1,1) end
address = tonumber(address)
if (not address) or address > 31 or address < 0 or math.floor(address) ~= address then
print("Invalid address - address must be an integer from 0 to 31")
else
digiline_send(mem.channel,{command = "read",address = address})
mem.readsuccess = false
interrupt(1,"readtimeout")
return --Suppress printing a new prompt
end
elseif string.sub(command,1,5) == "write" then
local address = string.sub(command,7,8)
local data = string.sub(command,10,-1)
if string.sub(address,2,2) == " " then
address = string.sub(command,7,7)
data = string.sub(command,9,-1)
end
address = tonumber(address)
if (not address) or address > 31 or address <0 or math.floor(address) ~= address then
print("Invalid address - address must be an integer from 0 to 31")
elseif data == "" then
print("No data specified")
else
print(string.format("Wrote to address %d",address))
digiline_send(mem.channel,{command = "write",address = address,data = data})
end
elseif string.sub(command,1,7) == "channel" then
local channel = string.sub(command,9,-1)
if channel and channel ~= "" then
mem.channel = channel
print("Channel changed")
else
print("No channel specified")
end
elseif command == "clear" then
clearterm()
print(">")
return --Suppress printing a new prompt - it was done already to omit the blank line
elseif command == "help" then
print("Available commands:")
print("channel <channel>: Changes the digilines channel the memory device is attached to, default is \"memory\"")
print("clear: Clears the screen")
print("read <address>: Reads from the specified address and displays the received data")
print("write <address> <data>: Writes the specified data to the specified address")
print("help: Shows this help message")
elseif command == "" then
--Do nothing
else
print("Unknown command - use \"help\" to see a list of valid commands.")
end
print()
print(">")
end
if event.type == "program" then
mem.channel = "memory"
runcmd("clear")
elseif event.iid == "readtimeout" and not mem.readsuccess then
print("No response received. Is there a memory device connected on the channel \""..mem.channel.."\"?")
print()
print(">")
elseif event.channel == mem.channel then
mem.readsuccess = true
print(event.msg)
print()
print(">")
elseif event.type == "terminal" then
runcmd(event.text)
end
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