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2	2
3	3	{{toc/}}
4	4
5		-
6		-
7		-
8	8	= 1. Introduction =
9	9
10	10	This instruction shows how to upgrade firmware for Dragino products base on STM32 solution. The upgrade can use 2 hardware connections: **UART upgrade** or **ST Link v2 upgrade**. Some models supports both methods and some only one of them.
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28	28	|(% style="width:444px" %)[[LTC2>>url:https://www.dragino.com/products/temperature-humidity-sensor/item/170-ltc2.html]]|(% style="width:239px" %)×|(% style="width:204px" %)[[Hardware Connect Photo>>||anchor="H4.1.5LTC2"]]
29	29
30	30
31		-
32	32	= 3. UART Upgrade Guide =
33	33
34	34	== 3.1 Hardware Connection ==
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62	62	* Connect JP2 jumper (Yellow one), so device is power on.
63	63
64	64
65		-
66	66	== 3.2 Upgrade Steps ==
67	67
68	68	(((
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127	127	1. If you use Windows10 system. Please change the flash loader to run in Windows7 compatibility mode.
128	128	1. We see a case the FT232 USB TTL adapter has reliability issue with the PC USB chipset(Intel). In this case, even above, it still has serious reliability issue for uploading. If this happen, change a PC or change a USB to TTL adapter will solve.
129	129
	125	+
130	130	== 3.4 Flash Loader ~-~- Unable to Load data from this file ==
131	131
132	132	[[image:image-20220526174137-8.png]]
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170	170	* ST-LINK v2 SWCLK <~-~-> Dupont green pin
171	171	* ST-LINK v2 SWDIO <~-~-> Dupont white pin
172	172
	169	+
173	173	=== 4.1.3 LAQ4 ST-Link v2 Connection ===
174	174
175	175	[[image:image-20220526174602-14.png||height="506" width="922"]]
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191	191	* ST-LINK v2 SWDIO <~-~-> SWDIO
192	192	* ST-LINK (VDD 3.3v,pin19) <~-~-> ST-LINK (TVCC ,pin1) a wire to connect two pins of ST-Link together.
193	193
	191	+
194	194	=== 4.1.5 LTC2 ===
195	195
196	196	[[image:image-20220526175131-18.png]]
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204	204	* ST-LINK v2 SWCLK <~-~-> LTC2 SWCLK
205	205	* ST-LINK v2 SWDIO <~-~-> LTC2 SWDIO
206	206
	205	+
207	207	== 4.2 ST-Link Upgrade Guide ==
208	208
209	209	(((