dseq_bs
Differences
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dseq_bs [2006/11/06 21:11] mess major update, new saving system explained |
dseq_bs [2006/12/12 12:10] mess |
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| - | ====== 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 goes a lot quicker so we can just call readpage for each block... | ||
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| - | |||
| - | |||
| - | Code from bankstick.c: | ||
| - | |||
| - | <code> | ||
| - | ///////////////////////////////////////////////////////////////////////////// | ||
| - | // This function initialises a pattern save | ||
| - | ///////////////////////////////////////////////////////////////////////////// | ||
| - | void BS_SavePat (unsigned char pat_nr){ | ||
| - | //only init block save if no other save is in progress | ||
| - | if (save_block_cnt < NR_BLOCK) | ||
| - | return; | ||
| - | |||
| - | //each pattern contains 256 bytes | ||
| - | //so address = pat_nr*256 | ||
| - | writeaddr = ((unsigned int)pat_nr) << 8; | ||
| - | save_block_cnt = 0; | ||
| - | } | ||
| - | ///////////////////////////////////////////////////////////////////////////// | ||
| - | // This function saves a pattern block to a bankstick | ||
| - | ///////////////////////////////////////////////////////////////////////////// | ||
| - | void BS_SaveBlock (){ | ||
| - | unsigned char error = 0; | ||
| - | //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++; | ||
| - | |||
| - | if (error) { | ||
| - | MIOS_LCD_CursorSet(0xC0 + 0); | ||
| - | MIOS_LCD_PrintCString("error saving pattern"); | ||
| - | MIOS_LCD_MessageStart(128); | ||
| - | //stop saving pattern | ||
| - | save_block_cnt = NR_BLOCK; | ||
| - | } | ||
| - | } | ||
| - | |||
| - | } | ||
| - | |||
| - | ///////////////////////////////////////////////////////////////////////////// | ||
| - | // This function loads a pattern from a bankstick | ||
| - | ///////////////////////////////////////////////////////////////////////////// | ||
| - | 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); | ||
| - | } | ||
| - | |||
| - | </code> | ||
| - | \\ | ||
| - | back to [[DSEQ32]] | ||
dseq_bs.txt ยท Last modified: 2006/12/12 12:10 by mess
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