Chao at 06:54, 9 March 2021

2021-03-09T06:54:19Z

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== Hardware UART Chip ==
Hardware: Use with easy [https://www.electrodragon.com/product/arduino-uno-r3/ microcontroller arduino]
* only need to connect
module serial TX pin -> arduino serial RX pin, which is arduino D0 pin
also connect the common ground.
Hardware: Use with USB-TTL Debugger: [https://www.electrodragon.com/product-tag/usb-ttl/ get a USB-TTL debugger here]
* recommand CP2102, CH340 or FT232.
* Same connect the target module TX (send) pin to USB-TTL debugger RX (receive) pin. Connect debuger USB to PC, use software SSCOM to read it.
* Recommand software SSCOM51, please find in github.
Software: Use with SSCOM
* Switch to english version, supported
* Please double check baudrate, stop bits, etc. For example, HLW8032 is 4800bps, EL125 is 9600bps
* click "AddCrLF" depends on the target
*

== Monitor Tool ==
=== Tools ===
SSCOM Serial USB-TTL testing tool please find [https://github.com/Edragon/Tools here.]
<gallery>
File:Sim7020e_debug.png | SIM7020E debug settings
File:2019-10-18_134123.png | Arduino UNO with EY-08 communication, notice no need /r/n
</gallery>

The rest
* Terminal [https://sites.google.com/site/terminalbpp/ Terminal], read more details on this [http://www.electrodragon.com/?p=2904 post].

* [http://www.putty.org Putty]
* [http://www.vandyke.com/products/securecrt/ SecurecRT]
* [http://www.chiark.greenend.org.uk/~sgtatham/putty/download.html Putty]
* [http://freeware.the-meiers.org/ CoolTerm]

== UART USB-TTL ==
Check here to see the definition of [http://en.wikipedia.org/wiki/Universal_asynchronous_receiver/transmitter UART ]in wikipedia.

{| class="wikitable sortable"
|-
! Type !! Features !! Compatiblity !! Link/Datasheet !! Driver !! Price
|-
| [[PL2303HX]] || - || Not compatible WIN7 || || || x
|-
| PL2303HXD (rev. D) || - || Compatible WIN7 || || || 7.5-10.5
|-
| PL2303TA || - || Compatible WIN7-10, autoupdate || || || 4.5-7.5
|-
| CP2102 || QFN28 (5x5mm) || - || || || 6-8.5
|-
| CP2104 ||
* OTP one time program
* QFN24 (4x4mm)
* cheaper than CP2102,
* 5V compatible
* RS-485 supported
* GPIO
|| - || || || 5-7.5
|-
| CH340G ||
* Baudrate ~ 2M
|| Compatible WIN10, online install || || || 1.5-2.5
|-
| CH341A ||
|-
| [[FTDI]] FT232RL ||
|-
| [[Holtek]] HT42B534 ||
* Baudrate ~ 3M
* VDDIO supports 1.8~5.5V for DSP
* integrated crystal+EEPROM to store VID, etc
* support from XP to WIN10, android 4.0+IOS
|| WIN10, IOS, Linux Driver free || [http://www.holtek.com.tw/productdetail/-/vg/42B534-x link], [[:File:HT42B534.pdf|Datasheet]] || [[File:Ht42B534.zip|Driver for WIN7-WIN8]] || 1-2

|}
=== Generate Compare ===
USB - UART/RS-232/RS-485/RS-422
{| class="wikitable sortable"
|-
! Header text !! Manufacturer !! Interface !! Rate !! Package
|-
| PL2303HX / PL2303HXD /PL2303TA || USB <> 1x UART/RS-232 || Example
|-
| CP2102 /CP2104 || SI || USB <> 1x UART/RS-232
|-
| CP2105 || SI || USB <> 2x UART/RS-232
|-
| CH330N || [[WCH]] || USB <> 1x UART || 2Mbps || SOP8
|-
| CH340C / CH340E / CH340G || [[WCH]] || USB <> 1x UART/RS-232/RS-485
|-
| CH9340 || [[WCH]] || USB <> 1x UART/RS-232/RS-485
|-
| CH9342 || [[WCH]] || USB <> 2x UART
|-
| CH9344 || [[WCH]] || USB <> 1x UART/RS-232 + 3x UART
|-
| CH341A || [[WCH]] || USB <> 1x UART / Parallel / SPI / I2C / etc ||
|-
| FT232RL || [[FTDI]] || USB <> 1x UART/RS-232/RS-485/RS-422 ||
|-
| FT2232RL || [[FTDI]] || USB <> 2x UART/RS-232/RS-485/RS-422 ||
|-
| FT4232RL || [[FTDI]] || USB <> 4x UART/RS-232/RS-485/RS-422 ||

|-
| HT42B534 || [[Holtek]] || USB <> 1x UART/RS-232 ||
|}
Parallel / Serial SPI - UART/RS-232/RS-485/RS-422
* CH438
* CH432 || [[WCH]] || USB <> 2x UART
=== Serial Voltage level ===
<gallery>
File:SIM900 Serial.jpg| voltage divider on left side for GSM rx pin
SIM800_UNO1.jpg| RX pin of SIM900 is 3v3
</gallery>

== Schematic ==
<gallery>
File:SC161S.png | SC161S, I2S to two serial port
</gallery>

== Switch RS232 UART ==
<gallery>
File:74AHC86_sch_01.png | 74AHC86 01
File:74AHC86_sch_02.png | 74AHC86 02
</gallery>
== Linux (Raspberry PI)==
* sudo raspi-config -> 选择Interfacing Options -> Serial，关闭shell访问，打开硬件串口
* sudo nano /boot/config.txt
enable_uart=1
#dtoverlay=pi3-miniuart-bt
== Software ==
=== ISP Serial Auto download Circuits Design ===
* RTS#：信号输出，初始状态为高电平，表示芯片接收数据已经准备就绪，下载程序时会变成低电平。
* DTR#：信号输出，初始状态为高电平，下载程序时会变成低电平（但是，是在RTS变为低电平之后才为低）。
Working method for STM32 DL
{| class="wikitable sortable"
|-
! Header text !! Normal !! Beginning !! Start Writing !! Finiash Writing !! Normal
|-
| DTR || 1 || 1 || 0 || 0 || 1
|-
| RTS || 1|| 0 || 0 || 1 || 1
|}
Auto download esp
{| class="wikitable sortable"
|-
|-
| DTR || 1 || 1 || 0 || 0
|-
| RTS || 1|| 0 || 0 || 1
|-
| ESP8266 RST || 1 || 0 || 1 || 1
|-
| ESP8266 GPIO0 || 1 || 1 || 1 || 0
|}
<gallery>
File:Stm32_auto_download.png | STM32 ISP Serial auto download
File:Stm32_mcuisp_setup.jpg | STM32 MCUIPS software control DTR/CTS
File:Esp8266_software_uart_control.png | ESP8266 programmer esptools use software uart control method
File:Esp8266_auto_download.jpg | ESP8266 ESP32 ISP Serial auto download, same for Maixpy K210
File:Esp8266_auto_download4.png | ESP8266 auto download
File:Esp8266_auto_download2.jpg | ESP8266 auto DL2 (Not testedd)
File:Esp8266_auto_download3.jpg | ESP8266 auto DL3, need external power (not tested)

</gallery>
=== Pulse to auto reset ciruits DTR ===
* reference - https://tttapa.github.io/ESP8266/Chap06%20-%20Uploading.html
== Arduino Serial ==
=== Hardware Serial ===
* Simply flashed a sketch who does not use the hardware serial D0 / D1
* Do not connect external device during upload sketch
* Connect Target TXD to arduino D1, Target RXD to arduino D0
* Open serial monitor to read data
[[category: Interface]]

Category:Serial - Revision history

Chao at 06:54, 9 March 2021