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