https://github.com/greatcattw/linkit7688_spi_nor

linkit7688 / mt7688 spi#1 with nor flash at45db041d
https://github.com/greatcattw/linkit7688_spi_nor

at45db041 linkit7688 mt7688 openwrt

Last synced: 4 months ago
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linkit7688 / mt7688 spi#1 with nor flash at45db041d

• Host: GitHub
• URL: https://github.com/greatcattw/linkit7688_spi_nor
• Owner: greatcattw
• Created: 2023-01-05T02:37:55.000Z (over 2 years ago)
• Default Branch: main
• Last Pushed: 2023-01-05T03:35:36.000Z (over 2 years ago)
• Last Synced: 2024-12-29T08:12:47.222Z (6 months ago)
• Topics: at45db041, linkit7688, mt7688, openwrt
• Language: C
• Homepage:
• Size: 896 KB
• Stars: 1
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
# Linkit7688 / mt7688 SPI interface with NOR flash at45db041d test

Connecting as below picture

![pic](pic/P_20230103_145531_1.jpg)

Test environment  

![pic](pic/000.png)




Test, 32 byte output and 32 byte input, it is OK.  

Linkit7688 linux 3.18.109 ,There is a SPI node of /dev/spidev32766.1

Read/write this node and access the SPI peripheral.

Half duplex mode, The max r/w is 32 byte input and 32 byte output,

In a word, it takes the time of 64 byte. It is not able to run loopback in the mode.

![pic](pic/00.png)




  

Test, 33 byte output and 33 byte input, it is NG.

![pic](pic/01.png)




  

Read AT45 busy flag,

bit#7 = 1 = ready

bit#7 = 0 = busy

![pic](pic/02.png)




  

Read chip ID = 1F 24 00 00

![pic](pic/03.png)




  

Erase full NOR chip, it takes some time.

Check busy flag = 0 = busy

![pic](pic/04.png)




  

Ask AT45 copy date from NOR page#0 to AT45 buffer, and read AT45 buffer to linkit7688.

Because of operation of chip erase, 256 bytes of data are 0xFF.

![pic](pic/10.png)




  

Write AT45 buffer with 00 – FF, and ask AT45 write date from buffer to AT45 NOR page#0

![pic](pic/12.png)




  

Power off system and Power on again.

Ask AT45 copy data from NOR page#0 to AT45 buffer,and read data from AT45 buffer to linkit7688,

All of data is kept.

![pic](pic/16.png)