Easy-Downloader V1.1 with SDCC

文章摘要：Complete schematic, orcad pcb layout of Easy-Downloader V1.1 and modified firmware with sdcc. I am very happy to use sdcc for writing firmware of my project. The compiled code is very compact and nice. After I succeeded writing a new firmware of xtimer and Easy-downloader V1.1 With sdcc. I cannot s

Easy-Downloader V1.1 with SDCC,标签：电路图讲解,电路图练习,http://www.88dzw.com

Complete schematic, orcad pcb layout of Easy-Downloader V1.1 and modified firmware with sdcc.

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I am very happy to use sdcc for writing firmware of my project. The compiled code is very compact and nice. After I succeeded writing a new firmware of xtimer and Easy-downloader V1.1 With sdcc. I cannot stop preparing a new page that gives the idea how to use sdcc and of course it's time to renovate my old project with orcad. For now I can design the hardware, draw a schematic, write the firmware and layout the pcb. So I think why shouldn't begin with Easy-Downloader. Since the programmer board will enable learning and developing the small project with a cheap 20-pin MCU easily.

Figure 1: Complete Hardware schematic of Easy-Downloader V1.1 ( see errata below).

easy1_3.pdf

Hardware

The hardware has a bit change at rs232 level converter. Now the circuit uses a popular rs232 level converter, MAX232. Also I cut the bridge diode at the DC input, now I use only one diode to prevent wrong polarity of a given DC adapter.

Layout

The pcb layout was made with orcad Layout Plus. The gerber file is available at download section below. Here I like to show how nice it is. The top and bottom layers are shown in Figure 2 and Figure 3. Figure 4 shows the component placement layout.

Figure 2: Top layer pcb x2 size.

Figure 3: Bottom layer pcb x2 size.
 

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Tag:单片机电路图，电路图讲解,电路图练习，电子电路图 - 单片机电路图