faq

csrc/u8x8_d_max7219.c

@@ -132,7 +132,13 @@ static uint8_t u8x8_d_max7219_generic(u8x8_t *u8x8, uint8_t msg, uint8_t arg_int
     case U8X8_MSG_DISPLAY_SET_CONTRAST:
       u8x8_cad_StartTransfer(u8x8);
       u8x8_cad_SendCmd(u8x8, 10 );    /* brightness */
-      u8x8_cad_SendArg(u8x8, (arg_int>>16) );	/* 0..15 for contrast */
+      u8x8_cad_SendArg(u8x8, (arg_int>>4) );	/* 0..15 for contrast */
+      u8x8_cad_SendCmd(u8x8, 10 );    /* brightness */
+      u8x8_cad_SendArg(u8x8, (arg_int>>4) );	/* 0..15 for contrast */
+      u8x8_cad_SendCmd(u8x8, 10 );    /* brightness */
+      u8x8_cad_SendArg(u8x8, (arg_int>>4) );	/* 0..15 for contrast */
+      u8x8_cad_SendCmd(u8x8, 10 );    /* brightness */
+      u8x8_cad_SendArg(u8x8, (arg_int>>4) );	/* 0..15 for contrast */
       u8x8_cad_EndTransfer(u8x8);
       break;
 #endif

doc/faq.txt

@@ -158,14 +158,13 @@ the font data. The font data can be pasted into an existing file of your project
 Q: Which commandline options are required for bdfconv?
 A: "bdfconv -f 1 -m '32-255' -n fontname -o myfont.c myfont.bdf"
 "-f 1" generates a u8g2 font.
-"-m '32-255'" selects unicode 32 to 255.
+"-m '32-255'" selects unicode 32 to 255. On Windows, please use double quotes: -m "32-255"
 "-n fontname": This is the name of the font in C/C++/Ino files.
 "-o myfont.c": The font array will be stored in this file.
 "myfont.bdf": The input file with the font data (bdf format).
-Note: Use double quotes for the -m argument on Windows.
 
 Q: Where do I find bdfconv?
-A: A Windows executable is available at here:
+A: A Windows executable is available here:
 https://github.com/olikraus/u8g2/tree/master/tools/font/bdfconv
 Use the Makefile in this directory to create a Linux binary.
 

sys/arduino/u8g2_full_buffer/MAX7219_U8g2/MAX7219_U8g2.ino

@@ -50,6 +50,7 @@ U8G2_MAX7219_32X8_F_4W_SW_SPI u8g2(U8G2_R0, /* clock=*/ 11, /* data=*/ 12, /* cs
 
 void setup(void) {
   u8g2.begin();
+  u8g2.setContrast(10*16);
 }
 
 void loop(void) {