From 32641893e75f11903489a38a201bd661c8f99b50 Mon Sep 17 00:00:00 2001
From: cheapie <no-email-for-you@example.com>
Date: Fri, 7 Jan 2022 16:51:04 -0600
Subject: Add examples for a few devices

---
 lc_examples/memory.lua | 81 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 81 insertions(+)
 create mode 100644 lc_examples/memory.lua

(limited to 'lc_examples/memory.lua')

diff --git a/lc_examples/memory.lua b/lc_examples/memory.lua
new file mode 100644
index 0000000..cf38121
--- /dev/null
+++ b/lc_examples/memory.lua
@@ -0,0 +1,81 @@
+--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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