Hmt.gettick() function usage - Revision history

Usr255: /* downloads */

2025-08-29T06:36:32Z

downloads

← Older revision		Revision as of 14:36, 29 August 2025
Line 72:		Line 72:
	* Example Model: HMT070DTA-D		* Example Model: HMT070DTA-D
	* demo project: [[Media:SDM-22-0008(unlock 5mode graph touch n slide)(gettick fixed).zip\|SDM-22-0008(unlock_5mode_graph_touch_n_slide)(gettick_fixed).zip]]		* demo project: [[Media:SDM-22-0008(unlock 5mode graph touch n slide)(gettick fixed).zip\|SDM-22-0008(unlock_5mode_graph_touch_n_slide)(gettick_fixed).zip]]
	* demo video: ~~SDM-22-0008(unlock_5mode_graph_touch_n_slide)~~.~~mp4~~		* demo video: [https://youtube.com/shorts/_3PkXIiHGDI?feature=share youtube.com/shorts/_3PkXIiHGDI?feature=share]

Usr255: /* downloads */

2025-08-29T05:35:13Z

downloads

← Older revision		Revision as of 13:35, 29 August 2025
Line 69:		Line 69:
	=== downloads ===		=== downloads ===
	[[File:SDM-22-0008-01.png\|480x480px]]		[[File:SDM-22-0008-01.png\|480x480px]]
	~~demo project: [[Media:SDM-22-0008(unlock 5mode graph touch n slide)(gettick fixed).zip\|SDM-22-0008(unlock_5mode_graph_touch_n_slide)(gettick_fixed).zip]]~~

	demo video: SDM-22-0008(unlock_5mode_graph_touch_n_slide).mp4		* Example Model: HMT070DTA-D
			* demo project: [[Media:SDM-22-0008(unlock 5mode graph touch n slide)(gettick fixed).zip\|SDM-22-0008(unlock_5mode_graph_touch_n_slide)(gettick_fixed).zip]]
			* demo video: SDM-22-0008(unlock_5mode_graph_touch_n_slide).mp4

Usr255: /* downloads */

2025-08-22T11:33:44Z

downloads

← Older revision		Revision as of 19:33, 22 August 2025
Line 68:		Line 68:

	=== downloads ===		=== downloads ===
			[[File:SDM-22-0008-01.png\|480x480px]]
	demo project: [[Media:SDM-22-0008(unlock 5mode graph touch n slide)(gettick fixed).zip\|SDM-22-0008(unlock_5mode_graph_touch_n_slide)(gettick_fixed).zip]]		demo project: [[Media:SDM-22-0008(unlock 5mode graph touch n slide)(gettick fixed).zip\|SDM-22-0008(unlock_5mode_graph_touch_n_slide)(gettick_fixed).zip]]

	demo video: SDM-22-0008(unlock_5mode_graph_touch_n_slide).mp4		demo video: SDM-22-0008(unlock_5mode_graph_touch_n_slide).mp4

Usr255 at 11:29, 22 August 2025

2025-08-22T11:29:36Z

← Older revision		Revision as of 19:29, 22 August 2025
Line 68:		Line 68:

	=== downloads ===		=== downloads ===
	demo project: SDM-22-0008(unlock_5mode_graph_touch_n_slide)(gettick_fixed).zip		demo project: [[Media:SDM-22-0008(unlock 5mode graph touch n slide)(gettick fixed).zip\|SDM-22-0008(unlock_5mode_graph_touch_n_slide)(gettick_fixed).zip]]

	demo video: SDM-22-0008(unlock_5mode_graph_touch_n_slide).mp4		demo video: SDM-22-0008(unlock_5mode_graph_touch_n_slide).mp4

Usr255: /* hmt.gettick() function */

2025-08-22T11:27:37Z

hmt.gettick() function

← Older revision		Revision as of 19:27, 22 August 2025
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	==== hmt.gettick() function ====		==== hmt.gettick() function ====

	* provide system tick is close ms.		* provide system tick close to ms.

	* Using a video clip time count of 51-20=31 second; we can get on screen tick value: 3970754-4000754=30000		* Using a video clip time count of 51-20=31 second; we can get on screen tick value: 3970754-4000754=30000
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	-- Lua script end		-- Lua script end

	* The above Lua script can work ~~well~~ over 4hour		* The above Lua script can work continually over 4hour
	* It can do the overflow check and do the "routine process"		* It can do the overflow check and do the "routine process"
	* Run and check the above script at about 71minutes by a video		* Run and check the above script at about 71minutes by a video
Line 65:		Line 65:
	* hmt.gettick() value will be overflow		* hmt.gettick() value will be overflow
	* hmt.gettick() max value is 4294966		* hmt.gettick() max value is 4294966
	* As it need long time to expose the overflow it is ~~nessary~~ to consider the overflow decision logic		* As it need long time to expose the overflow it is necessary to consider the overflow decision logic

	=== downloads ===		=== downloads ===

Usr255: Created page with "=== background === Smart LCD provide script function, it can enhance the functionality in applications. hmt.gettick() is a MCU tick time function for timing reference. It is necessary to understand its characteristics to prevent to get hidden bug in the Lua script. ==== hmt.gettick() function ==== * provide system tick is close ms. * Using a video clip time count of 51-20=31 second; we can get on screen tick value: 3970754-4000754=30000 File:Gettick-31s.png|400x40..."

2025-08-22T11:25:05Z

Created page with "=== background === Smart LCD provide script function, it can enhance the functionality in applications. hmt.gettick() is a MCU tick time function for timing reference. It is necessary to understand its characteristics to prevent to get hidden bug in the Lua script. ==== hmt.gettick() function ==== * provide system tick is close ms. * Using a video clip time count of 51-20=31 second; we can get on screen tick value: 3970754-4000754=30000 File:Gettick-31s.png|400x40..."

New page

=== background ===
Smart LCD provide script function, it can enhance the functionality in applications. hmt.gettick() is a MCU tick time function for timing reference. It is necessary to understand its characteristics to prevent to get hidden bug in the Lua script.

==== hmt.gettick() function ====

* provide system tick is close ms.

* Using a video clip time count of 51-20=31 second; we can get on screen tick value: 3970754-4000754=30000

[[File:Gettick-31s.png|400x400px]]

* Using video frame count 97.015 - 44.015 = 53 second; we can get on screen tick value 4137010-4084060=52950

[[File:Gettick-53s.png]]

* hmt.gettick() max value is 4294966

==== hmt.gettick() application (without overflow check) ====

* Lua script

loop_speed=150
loop_tic=hmt.gettick()
luamain = function(void) -- main loop
if ((hmt.gettick() - loop_tic) >= loop_speed) then -- looping control
-- routine process
loop_tic=hmt.gettick()
end
return 0
end
-- Lua script end

* The above Lua script can work normally for about 71minutes
* After then it will not execute the "routine process"
* It is easy to be over looked

==== hmt.gettick() application (with overflow check) ====

* Lua script

loop_speed=150
loop_tic=hmt.gettick()
temp=0
luamain = function(void) -- main loop
temp=hmt.gettick() - loop_tic -- looping control
if ( (temp >= loop_speed) or (temp 'smaller_than' 0)) then
-- routine process
loop_tic=hmt.gettick()
end
return 0
end
-- Lua script end

* The above Lua script can work well over 4hour
* It can do the overflow check and do the "routine process"
* Run and check the above script at about 71minutes by a video

[[File:Gettick-max.png|800x800px]]

* The video capture 4294895(dec) and then 7(dec) which corrosed hmt.gettick() max value (4294966)
* hmt.gettick() will be overflow every 71min 35second by calculation

=== note. ===

* hmt.gettick() value will be overflow
* hmt.gettick() max value is 4294966
* As it need long time to expose the overflow it is nessary to consider the overflow decision logic

=== downloads ===
demo project: SDM-22-0008(unlock_5mode_graph_touch_n_slide)(gettick_fixed).zip

demo video: SDM-22-0008(unlock_5mode_graph_touch_n_slide).mp4