Differences

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--- dseq_bs [2006/10/15 09:35] – (old revision restored) 127.0.0.1
+++ dseq_bs [2006/12/12 12:10] (current) – mess
@@ Line 1: / Line 1: @@
-bankstick code from bankstick.c
+====== Bankstick Routines ======
+This routines will load/save patterns from a bankstick module
+We're using the writepage MIOS function because a write to the bankstick takes a long time
+this way we can write 64bytes at once so only 4 eeprom accesses are necessary
+First versions of the firmware had a pattern size of 128bytes
+so a pattern could be saved with two calls to the writepage function
+Saving a pattern with 256bytes takes four page writes, this makes it impossible
+to save the four pages after each other without affecting the sequencer timing. \\
+To avoid this the pattern is written over four ticks. Each time the program cycles through
+the main loop a block is written until the whole pattern is saved.
+Reading from a eeprom is a lot quicker so we can just call readpage for each block...
+Code from bankstick.c:
 <code>
 /////////////////////////////////////////////////////////////////////////////
-// These functions load/save a pattern from bankstick
+//	This function initialises a pattern save
-// using 2 page reads/writes
 /////////////////////////////////////////////////////////////////////////////
 void BS_SavePat (unsigned char pat_nr){
-	unsigned char error = 0;
+	//only init block save if no other save is in progress
-	unsigned int writeaddr;
+	if (save_block_cnt < NR_BLOCK)
+		return;
-	//each pattern contains 128 bytes
+	//each pattern contains 256 bytes
-	//so address = pat_nr*128
+	//so address = pat_nr*256
-	writeaddr = ((unsigned int)pat_nr) << 7;
+	writeaddr = ((unsigned int)pat_nr) << 8;
+	save_block_cnt = 0;
-	//write all values to bankstick
-	error = MIOS_BANKSTICK_WritePage(writeaddr, buffer);
-	error |= MIOS_BANKSTICK_WritePage(writeaddr + 64, buffer+64);
-        //need to do some error handling
 }
-void BS_LoadPat (unsigned char pat_nr){
+/////////////////////////////////////////////////////////////////////////////
+//	This function saves a pattern block to a bankstick
+/////////////////////////////////////////////////////////////////////////////
+void BS_SaveBlock (){
 	unsigned char error = 0;
-	unsigned int readaddr;
+	//check if something has to be saved
+	if (save_block_cnt < NR_BLOCK) {
+		//write block
+		error |= MIOS_BANKSTICK_WritePage(writeaddr, buffer + (save_block_cnt<<6));
+		//calculate address of next block
+		writeaddr += 0x40;
+		save_block_cnt++;
-	//each pattern contains 128 bytes
+		if (error) {
-	//so address = pat_nr*128
+			MIOS_LCD_CursorSet(0xC0 + 0);
-	readaddr = ((unsigned int)pat_nr) << 7;
+			MIOS_LCD_PrintCString("error saving pattern");
+			MIOS_LCD_MessageStart(128);
+			//stop saving pattern
+			save_block_cnt = NR_BLOCK;
+		}
+	}
-	//write all values to bankstick
+}
-	MIOS_BANKSTICK_ReadPage(readaddr, buffer);
-	MIOS_BANKSTICK_ReadPage(readaddr+64, buffer+64);
+/////////////////////////////////////////////////////////////////////////////
+//	This function loads a pattern from a bankstick
-        //need to do some error handling
+/////////////////////////////////////////////////////////////////////////////
+void BS_LoadPat (unsigned char pat_nr){
+	unsigned int readaddr;
+	unsigned char i;
+	//each pattern contains 256 bytes
+	//so address = pat_nr*256
+	readaddr = ((unsigned int)pat_nr) << 8;
+	//load all values to bankstick
+	//(will be optimised in the future)
+	MIOS_BANKSTICK_ReadPage(readaddr + 0x00, buffer + 0x00);
+	MIOS_BANKSTICK_ReadPage(readaddr + 0x40, buffer + 0x40);
+	MIOS_BANKSTICK_ReadPage(readaddr + 0x80, buffer + 0x80);
+	MIOS_BANKSTICK_ReadPage(readaddr + 0xC0, buffer + 0xC0);
+	MIOS_LCD_CursorSet(0xC0 + 0);
+	if (MIOS_BOX_STAT.BS_AVAILABLE) {
+		MIOS_LCD_PrintCString("load ok");
+	} else {
+		MIOS_LCD_PrintCString("load error");
+	}
+	MIOS_LCD_MessageStart(128);
 }