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This is my first post here at All About Circuits, and I hope to have a good experience here.
I am trying to write assembly language code for use in a project that I am working on using the SSD1306 128x32 OLED w/ SPI and PIC Microcontroller. I have searched quite a bit but find almost nothing for this topic using SPI and assembly language. I thought I would give this forum a shot to see I could solve my issues w/ this project as described below.
Please see attached a copy of my code written for a PIC18LF26K22 in assembly for SPI and OLED SSD1306.
Now for the issues that I am having. I have read the datasheet and followed the Initialization sequence listed on page 64. I have also written my code to perform the needed reset before initializing the SSD1306. I then, in my code, wrote code to turn on a column of 8 bits on a page to show that my code works. I am using SPI mode 0 but have tried all modes with no difference in the outcome of the OLED not initializing. I have my PIC18LF on a breadboard running from a 3.3v LDO reg that I have used in many projects in the past and that is feeding the OLED which I have mounted to a Crystalfontz board which is for this OLED display. I have checked all connections and have also checked the Crystalfontz board for shorts which turned up none with my multi-meter continuity check. I have used the debugger w/ MPLABX and single stepped through all the code and have placed a blinking LED at the end of my code to signal to me that the code did complete of which it did.
No matter what I have tried I am not able to get this display to power up.
If anyone has any suggestions please post them here.
Thank you all!
Sarah
I am trying to write assembly language code for use in a project that I am working on using the SSD1306 128x32 OLED w/ SPI and PIC Microcontroller. I have searched quite a bit but find almost nothing for this topic using SPI and assembly language. I thought I would give this forum a shot to see I could solve my issues w/ this project as described below.
Please see attached a copy of my code written for a PIC18LF26K22 in assembly for SPI and OLED SSD1306.
Now for the issues that I am having. I have read the datasheet and followed the Initialization sequence listed on page 64. I have also written my code to perform the needed reset before initializing the SSD1306. I then, in my code, wrote code to turn on a column of 8 bits on a page to show that my code works. I am using SPI mode 0 but have tried all modes with no difference in the outcome of the OLED not initializing. I have my PIC18LF on a breadboard running from a 3.3v LDO reg that I have used in many projects in the past and that is feeding the OLED which I have mounted to a Crystalfontz board which is for this OLED display. I have checked all connections and have also checked the Crystalfontz board for shorts which turned up none with my multi-meter continuity check. I have used the debugger w/ MPLABX and single stepped through all the code and have placed a blinking LED at the end of my code to signal to me that the code did complete of which it did.
No matter what I have tried I am not able to get this display to power up.
If anyone has any suggestions please post them here.
Thank you all!
Sarah
