Update ultralcd_st7920_u8glib_rrd.h

9 years ago · b73ba26b23
1 changed files with 6 additions and 0 deletions
--- a/Marlin/ultralcd_st7920_u8glib_rrd.h
+++ b/Marlin/ultralcd_st7920_u8glib_rrd.h
@ -27,9 +27,15 @@ static void ST7920_SWSPI_SND_8BIT(uint8_t val)
  for( i=0; i<8; i++ )
  {
    WRITE(ST7920_CLK_PIN,0);
+    #if F_CPU == 20000000
+      __asm__("nop\n\t"); 
+    #endif
    WRITE(ST7920_DAT_PIN,val&0x80); 
    val<<=1;
    WRITE(ST7920_CLK_PIN,1);
+    #if F_CPU == 20000000
+      __asm__("nop\n\t""nop\n\t"); 
+    #endif
  }
 }