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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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61	61	* Put Switch SW1 to ISP position
62	62	* Connect JP2 jumper (Yellow one), so device is power on.
63	63
	60	+
64	64	== 3.2 Upgrade Steps ==
65	65
66	66	(((
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125	125	1. If you use Windows10 system. Please change the flash loader to run in Windows7 compatibility mode.
126	126	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.
127	127
	125	+
128	128	== 3.4 Flash Loader ~-~- Unable to Load data from this file ==
129	129
130	130	[[image:image-20220526174137-8.png]]
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168	168	* ST-LINK v2 SWCLK <~-~-> Dupont green pin
169	169	* ST-LINK v2 SWDIO <~-~-> Dupont white pin
170	170
	169	+
171	171	=== 4.1.3 LAQ4 ST-Link v2 Connection ===
172	172
173	173	[[image:image-20220526174602-14.png||height="506" width="922"]]
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189	189	* ST-LINK v2 SWDIO <~-~-> SWDIO
190	190	* ST-LINK (VDD 3.3v,pin19) <~-~-> ST-LINK (TVCC ,pin1) a wire to connect two pins of ST-Link together.
191	191
	191	+
192	192	=== 4.1.5 LTC2 ===
193	193
194	194	[[image:image-20220526175131-18.png]]
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202	202	* ST-LINK v2 SWCLK <~-~-> LTC2 SWCLK
203	203	* ST-LINK v2 SWDIO <~-~-> LTC2 SWDIO
204	204
	205	+
205	205	== 4.2 ST-Link Upgrade Guide ==
206	206
207	207	(((