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嵌入式软件要会画板子吗?

嵌入式软件要会画板子吗?

答案:要

作为嵌入式软件工程师,本来就经常和硬件打交道。调试各种协议也要看波形,用示波器什么的。软件玩多了也会腻,可以玩玩硬件,自己从 0 做出一个东西的感觉是不一样的。职业生涯那么长,多尝试一些总是好的,一个软硬件都懂的人,才能更好的带项目。

博主玩过很多板子,单片机有 STC51、STM32,Linux 有三星 S3C2440、NXP imx6ull、全志 V3s,Android 有 RK3399、RK356x 等。

不同平台架构不一样,性能也有高有低,适合不同的场景。

单片机的板子博主画过很多,也焊接过很多,可以参考如下文章:

什么算是嵌入式全栈?

Sensorhub 板子开发状态

但是博主还没有画过 Linux、Android 的板子。Android 板子太难,成本又高,市面上很少有个人开发者玩。但是 Linux 板子还是很多的,经过调研,博主想画一块全志 V3s Linux 开发板玩一玩,选 V3s 的原因有:

  1. 立创开源广场有很多开源项目可以参考,荔枝派也可以参考
  2. V3s 内置 64MB DDR2,画板子时不需要考虑 DDR,只需要注意 USB 和 SD 卡就行
  3. 因为 V3s 内置 DDR,所以板子画大一点两层板就可以,不需要四层板。如果你选的主控是外置 DDR,那得上四层板或六层板
  4. V3s 封装是 LQFP 封装,这种封装和 STM32 一样,容易手工焊接
  5. V3s 单核 Cortex-A7,主频 1.2Ghz,够高

V3s 封装如下,爪形封装,和 STM32 封装一样,这种封装一个电烙铁搞定:

可用参考连接:

https://oshwhub.com/
https://oshwhub.com/ftwtwzy/snaillpi_copy#P1
https://oshwhub.com/fanhuacloud/v3s_lcd

https://whycan.com/index.html
https://licheezero.readthedocs.io/zh/latest/
https://www.cnblogs.com/twzy/p/15691210.html

博主原来用 AD 软件画板,后来改用立创 EDA 画板,特别方便,不需要自己画器件封装,画好板子后购买元器件、打板都特别方便。

从单片机画板切换到 Linux 画板,可以先选择这种内置 DDR 的主控,可以把它当成大号的单片机。熟练以后,再选择外置 DDR 的主控,外置 DDR 在画板的时候就必须上 4 层或者 6 层板,还要做阻抗匹配,遵循 3W 原则、20H 原则、五五原则、差分走线、EMC 等。

其实全志 F1C200s 也是内置 DDR,网上也有很多开源项目。但是它是内置 64M DDR1,主频默认是 408Mhz,封装也不好焊,所以 pass 掉了。

文章封面是 AI 画的图,后面用图都不用网上找了,直接让 AI 画一个就行,还不担心侵权,AI 真的方便:

AI 真的提高了我的工作效率

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  1. CONNECT:[ UseTime:0.001009s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001927s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000784s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000649s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001568s ]
  6. SELECT * FROM `set` [ RunTime:0.000574s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001786s ]
  8. SELECT * FROM `article` WHERE `id` = 671849 LIMIT 1 [ RunTime:0.001222s ]
  9. UPDATE `article` SET `lasttime` = 1779868706 WHERE `id` = 671849 [ RunTime:0.001861s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000660s ]
  11. SELECT * FROM `article` WHERE `id` < 671849 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001316s ]
  12. SELECT * FROM `article` WHERE `id` > 671849 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001344s ]
  13. SELECT * FROM `article` WHERE `id` < 671849 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002125s ]
  14. SELECT * FROM `article` WHERE `id` < 671849 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002498s ]
  15. SELECT * FROM `article` WHERE `id` < 671849 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002569s ]
0.209837s