Lua Script

Smart LCD Lua Script Support

Lua script is supported in some of the TOPWAY Smart LCD to enhance the flexibility. Engineer may refine the Smart LCD functionality with script. The provided Lua functionality support most of the features of Lua 5.3 except OS operation. (please refer to lua.net for Lua 5.3 details)It also extended with hmt library for Smart LCD variables access, function control and value return etc.

Lua Script Structure

Basic structure

-- define variable(s)
Script_Variable01 = 0x00

-- main loop
luamain = function(void)

return 0
end

Note:

• main loop run continually
• intensive loop in the main loop may affect the Smart LCD UI operations

Advance structure with hooks

-- define variable(s)
Script_Variable01 = 0x00

-- main loop
luamain = function(void)

return 0
end

-- touch key hook
tpkhook = function(page, id, state)
return 0
end

-- page hook
pagechangehook = function(pageid)

return 0
end

Note:

• main loop run continually
• intensive loop in the main loop may affect the Smart LCD UI operations
• hooks share the MCU time with the main loop.
• looping or long delay will affect the main loop
• “wait loop” is not allowed in the hooks.

Smart LCD VP variables

Mnemonic	Name	Memory Limit	Address Range
VP_STR	String Variable	1024(MAX)*(127+1)byte	0x000000~0x01FF80
VP_N16	16Bit Integer Variable	32512(MAX)*(2)byte	0x080000~0x08FDFE
VP_N32	32Bit Integer Variable	16128(MAX)*(4)byte	0x020000~0x02FEFC
VP_N64	64Bit Integer Variable	7936(MAX)*(8)byte	0x030000~0x03F7F8
VP_SYS	System Register Variable	256(MAX)*(1)byte	0xFFFF00~0xFFFFFF

Note. Please also refer to Smart LCD handbook for VP variables details

hmt functions Summary

Category	Function Name	Descriptions
VP read/write	hmt.readvpstr(addr)	Read VP_STR value
	hmt.writevpstr(addr, string)	Write VP_STR value
	hmt.readvp16(addr)	Read VP_16 value
	hmt.writevp16(addr, value)	Write VP_16 value
	hmt.readvp32(addr)	Read VP_32 value
	hmt.readvp32f(addr)	Read VP_32 value (floating point value)
	hmt.writevp32(addr, value)	Write VP_32 value
	hmt.readvp64(addr)	Read VP_64 value
	hmt.readvp64f(addr)	Read VP_64 value (floating point value)
	hmt.writevp64(addr, value)	Write VP_64 value
	hmt.readvpreg(addr)	Read VP_SYS value
	hmt.writevpreg(addr, value)	Write VP_SYS value
System	hmt.changepage(pageid)	Display a pre-stored PAGE
	hmt.readpage()	Read Page ID
	hmt.gettick()	Read system time
	hmt.delayms(time)	Delay in ms(*1)
	hmt.runcmd(table, num)	Execute terminal command (without packet header and taill)
	hmt.bypass(is)	Disable Smart LCD terminal command execution (I/O); is=1 for disable; is=0 for enable(normal)
	hmt.crc16calc(table, num)	Generate a CRC value
	hmt.formatdisk2()	Format module flash second partition (*4)
	hmt.inituart(baudrate,parity)	Set baud rate and parity parameters of A and B (*4)
Thread	hmt.createthread(function())	Create a thread and return a thread object (*4)
	suspend()	Suspend thread (*4)
	resume()	Resume thread (*4)
	terminate()	Terminate thread (*4)
	getid()	Get thread ID and handle (*4)
UART0	hmt.uartisempty()	Check for UART0 buffer; 1 for empty; 0 for not empty
	hmt.uartclearbuf()	Clear UART0 buffer
	hmt.getchar()	Read a byte form UART0 buffer
	hmt.putchar(char)	Send a byte to UART0
	hmt.uartsendbytes(table, num)	Send a num of byte to UART0
	hmt.uartlock()	Lock UART0 before Lua sending data to UART0 (*2, *3)
	hmt.uartunlock()	Unlock UART0 after Lua sending data to UART0 (*2, *3)
UART1	hmt.uart1isempty()	Check for UART1 buffer; 1 for empty; 0 for not empty
	hmt.uart1clearbuf()	Clear UART1 buffer
	hmt.uart1getchar()	Read a byte form UART1 buffer
	hmt.uart1putchar(char)	Send a byte to UART1
	hmt.uart1sendbytes(table, num)	Send a num of byte to UART1
	hmt.uart1lock()	Lock UART1 before sending data to UART1 (*2, *3)
	hmt.uart1unlock()	Unlock UART1 after sending data to UART1 (*2, *3)

Note.
*1. long delay may affect the Smart LCD normal operation.
*2. It is necessary to lock the UART for Lua access, if hmt.bypass is not enabled.
*3. Generally hmt.uartlock() and hmt.uartunlock() should be used in pair.
*4. Selected model only