avr: work on simple GUI module to be used by node c02.

avr/modules/lcd2/ili9341/io_spi.asm

@@ -7,6 +7,11 @@
 ; * Please see toplevel file COPYING of that project for license details.   *
 ; ***************************************************************************
 
+#ifndef AQH_AVR_ILI9341_IO_SPI_ASM
+#define AQH_AVR_ILI9341_IO_SPI_ASM
+
+
+
 ; generally we use the following parameters here:
 ; @param r1:r0   background color
 ; @param r3:r2   foreground color
@@ -59,7 +64,7 @@ ILI9341IoInit:
 ili9341BeginSpi:
   ldi r16, ILI9341_SPIMODE
   ldi r17, ILI9341_DEVICENUM
-  rjmp SPIHW_MasterStart                   ; (R18)
+  rjmp SPIHW_MasterStart                   ; (R17)
 ; @end
 
 
@@ -75,17 +80,31 @@ ili9341EndSpi:
 
 
 
+; ---------------------------------------------------------------------------
+; @routine ili9341SendCommand
+;
+; @param  r16 byte to send
+; @return r16 byte received
+; @clobbers r16
+
 ili9341SendCommand:
   cbi SPIHW_SS_OUTPUT, SPIHW_SS_PIN       ; SS low
   cbi ILI9341_DC_OUTPUT, ILI9341_DC_PIN   ; D low
   nop
-  rcall SPIHW_MasterTransfer
+  rcall SPIHW_MasterTransfer              ; (none)
   sbi SPIHW_SS_OUTPUT, SPIHW_SS_PIN       ; SS low
   ret
 ; @end
 
 
 
+; ---------------------------------------------------------------------------
+; @routine ili9341SendData
+;
+; @param  r16 byte to send
+; @return r16 byte received
+; @clobbers r16
+
 ili9341SendData:
   cbi SPIHW_SS_OUTPUT, SPIHW_SS_PIN       ; SS low
   sbi ILI9341_DC_OUTPUT, ILI9341_DC_PIN   ; D high
@@ -96,7 +115,12 @@ ili9341SendData:
 
 
 
+; ---------------------------------------------------------------------------
+; @routine ili9341Send16BitData
+;
 ; @param r19:18 data
+; @clobbers r16
+
 ili9341Send16BitData:
   cbi SPIHW_SS_OUTPUT, SPIHW_SS_PIN       ; SS low
   sbi ILI9341_DC_OUTPUT, ILI9341_DC_PIN   ; D high
@@ -110,3 +134,5 @@ ili9341Send16BitData:
 
 
 
+#endif ; AQH_AVR_ILI9341_IO_SPI_ASM
+