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Decrease the needed nops to 1

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by shitfing the left shift into the high phase.

```
2	cbi 0x2,1 ;set CLK                      //
1	in r18,__SREG__                         //1
1-3	sbrc r24,7                              //2-4
2	rjmp .L19                               //4
1	cli                  .L19:              //5
2	lds r25,258          lds r25,258        //7
1	andi r25,lo8(-2)     ori r25,lo8(1)     //8
2	sts 258,r25          sts 258,r25        //10
1	out __SREG__,r18     out __SREG__,r18   //11
2	.L3:                 rjmp .L3           //13     //2
2	sbi 0x2,1 ;reset CLK //                 //13-15  //2-4
1	lsl r24	 ;  val      //1
1	nop                  //2
2	cbi 0x2,1 ;set CLK   //4
...
```
This commit is contained in:
AnHardt 2016-06-07 13:45:35 +02:00 committed by Scott Lahteine
parent 56c42b572c
commit 4454d80276
1 changed files with 12 additions and 14 deletions
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26
Marlin/ultralcd_st7920_u8glib_rrd.h
View file

@ -41,7 +41,6 @@
#include <U8glib.h>
//set optimization so ARDUINO optimizes this file
#pragma GCC push_options
#pragma GCC optimize (3)
#define DELAY_0_NOP ;
@ -64,9 +63,9 @@
#define ST7920_DELAY_2 DELAY_0_NOP
#endif
#ifndef ST7920_DELAY_3
#define ST7920_DELAY_3 DELAY_2_NOP
#define ST7920_DELAY_3 DELAY_1_NOP
#endif
#elif MOTHERBOARD == BOARD_3DRAG
#elif (MOTHERBOARD == BOARD_3DRAG) || (MOTHERBOARD == BOARD_K8200)
#ifndef ST7920_DELAY_1
#define ST7920_DELAY_1 DELAY_0_NOP
#endif
@ -74,7 +73,7 @@
#define ST7920_DELAY_2 DELAY_0_NOP
#endif
#ifndef ST7920_DELAY_3
#define ST7920_DELAY_3 DELAY_2_NOP
#define ST7920_DELAY_3 DELAY_1_NOP
#endif
#elif F_CPU == 16000000
#ifndef ST7920_DELAY_1
@ -84,7 +83,7 @@
#define ST7920_DELAY_2 DELAY_0_NOP
#endif
#ifndef ST7920_DELAY_3
#define ST7920_DELAY_3 DELAY_2_NOP
#define ST7920_DELAY_3 DELAY_1_NOP
#endif
#else
#error "No valid condition for delays in 'ultralcd_st7920_u8glib_rrd.h'"
@ -94,63 +93,62 @@ static void ST7920_SWSPI_SND_8BIT(uint8_t val) {
WRITE(ST7920_CLK_PIN,0);
ST7920_DELAY_1
WRITE(ST7920_DAT_PIN,val&0x80);
val<<=1;
ST7920_DELAY_2
WRITE(ST7920_CLK_PIN,1);
val<<=1;
ST7920_DELAY_3
WRITE(ST7920_CLK_PIN,0);
ST7920_DELAY_1
WRITE(ST7920_DAT_PIN,val&0x80);
val<<=1;
ST7920_DELAY_2
WRITE(ST7920_CLK_PIN,1);
val<<=1;
ST7920_DELAY_3
WRITE(ST7920_CLK_PIN,0);
ST7920_DELAY_1
WRITE(ST7920_DAT_PIN,val&0x80);
val<<=1;
ST7920_DELAY_2
WRITE(ST7920_CLK_PIN,1);
val<<=1;
ST7920_DELAY_3
WRITE(ST7920_CLK_PIN,0);
ST7920_DELAY_1
WRITE(ST7920_DAT_PIN,val&0x80);
val<<=1;
ST7920_DELAY_2
WRITE(ST7920_CLK_PIN,1);
val<<=1;
ST7920_DELAY_3
WRITE(ST7920_CLK_PIN,0);
ST7920_DELAY_1
WRITE(ST7920_DAT_PIN,val&0x80);
val<<=1;
ST7920_DELAY_2
WRITE(ST7920_CLK_PIN,1);
val<<=1;
ST7920_DELAY_3
WRITE(ST7920_CLK_PIN,0);
ST7920_DELAY_1
WRITE(ST7920_DAT_PIN,val&0x80);
val<<=1;
ST7920_DELAY_2
WRITE(ST7920_CLK_PIN,1);
val<<=1;
ST7920_DELAY_3
WRITE(ST7920_CLK_PIN,0);
ST7920_DELAY_1
WRITE(ST7920_DAT_PIN,val&0x80);
val<<=1;
ST7920_DELAY_2
WRITE(ST7920_CLK_PIN,1);
val<<=1;
ST7920_DELAY_3
WRITE(ST7920_CLK_PIN,0);
ST7920_DELAY_1
WRITE(ST7920_DAT_PIN,val&0x80);
val<<=1;
ST7920_DELAY_2
WRITE(ST7920_CLK_PIN,1);
}
@ -234,7 +232,7 @@ class U8GLIB_ST7920_128X64_RRD : public U8GLIB {
U8GLIB_ST7920_128X64_RRD(uint8_t dummy) : U8GLIB(&u8g_dev_st7920_128x64_rrd_sw_spi) { UNUSED(dummy); }
};
#pragma GCC pop_options
#pragma GCC reset_options
#endif //U8GLIB_ST7920
#endif //ULCDST7920_H