4-Bit mode for ST7920

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4 bit mode seems to be a good compromise between refresh speed and pins needed 
(brings it down by 4) According to the datasheet for the chip: 
http://www.dfrobot.com/image/data/FIT0021/ST7920.pdf
it is capable of operating in 4 bit mode. Thank you for your hard work!

Original issue reported on code.google.com by [e-mail] on 5 Jan 2013 at 7:26

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Sorry! I forgot to change the catagorey and priority! I also don't know how to 
edit it... 

Original comment by [e-mail] on 5 Jan 2013 at 7:28

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Thanks for entering this issue. I will have a look at it.
ToDo:
Check data transfer for 4-Bit mode (use init seq on page 35 of the datasheet)

Original comment by [e-mail] on 5 Jan 2013 at 11:29

• Changed state: Accepted
• Added labels: Milestone-1.10, Type-Enhancement
• Removed labels: Type-Defect

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Original comment by [e-mail] on 5 Jan 2013 at 11:29

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Original comment by [e-mail] on 27 Jan 2013 at 6:44

• Added labels: Milestone-1.11
• Removed labels: Milestone-1.10

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Original comment by [e-mail] on 24 Feb 2013 at 10:37

• Added labels: Milestone-Future
• Removed labels: Milestone-1.11

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  ST7920_192X32_1X, SPI:    FPS: Clip=10.3 Box=5.5  @=7.2 Pix=3.9
  ST7920_192X32_4X, SPI:    FPS: Clip=10.9 Box=6.7  @=8.8 Pix=7.4
  ST7920_192X32_1X, 8Bit:    FPS: Clip=14.2 Box=6.1  @=8.4 Pix=4.2
  ST7920_192X32_4X, 8Bit:    FPS: Clip=14.2 Box=7.8  @=10.7 Pix=8.7
  ST7920_192X32_1X, HW SPI:    FPS: Clip=14.2 Box=6.3  @=8.7 Pix=4.3
  ST7920_192X32_4X, HW SPI:    FPS: Clip=15.3 Box=8.0  @=11.2 Pix=9.0

Original comment by [e-mail] on 2 Mar 2013 at 9:44

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not sure if i will have time to implement this...

Original comment by [e-mail] on 22 Jan 2014 at 7:12

• Added labels: Priority-Low
• Removed labels: Priority-Medium