Differences

This shows you the differences between two versions of the page.

--- reprap:anet:anet_mainboard_overclocking [2018/01/04 05:30] – [Anet Motherboard Overclocking] gmarsh23
+++ reprap:anet:anet_mainboard_overclocking [2018/01/04 05:45] – [Marlin changes] gmarsh23
@@ Line 194: / Line 194: @@
   #endif
-=== pins_ANET_10.h ===
+=== Marlin/pins_ANET_10.h ===
 If you're using the stock A8 display, you can ignore this section. If you're using the full graphics display from the A6, this is required or else the display on the printer will be garbled.
@@ Line 210: / Line 210: @@
   #define ST7920_DELAY_3 DELAY_7_NOP
+=== Marlin/speed_lookuptable.h ===
+Marlin only comes with two lookup tables provided in this file, for operation at 16MHz and 20MHz. For other clock frequencies, a new stepper speed lookup table has to be added.
+Here is a replacement for the file which has the 24MHz table added: https://pastebin.com/KchhubLN
+To generate a table for a different frequency, Marlin provides a Python script in the buildroot/share/scripts which can be used to generate a new table. For example, to generate a table for 25MHz operation, use the following:
+  #> python createSpeedLookupTable.py --cpu-freq 25 > new_table.h
+If you're using a crystal frequency which isn't a multiple of 1MHz, you'll need to edit the script to remove the "* 1000000" line, and call the script with --cpu-freq <hz> instead.
 ==== Compiling and installing new firmware ====
 There are many guides online describing how to compile and install Marlin on an Anet A8. Find one and link it here :)