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Working on lazynes print.c demonstrating lnList()
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@ -96,10 +96,16 @@ char ppuDataRead();
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void ppuDataFill(void* const ppuData, char val, unsigned int size);
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// Transfer a number of bytes from the CPU memory to the PPU memory
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// - ppuData : Pointer in the PPU memory
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// - cpuData : Pointer to the CPU memory (RAM of ROM)
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// - size : The number of bytes to transfer
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void ppuDataTransfer(void* const ppuData, void* const cpuData, unsigned int size);
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// Transfer a number of bytes from the PPU memory to the CPU memory
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// - cpuData : Pointer to the CPU memory (RAM of ROM)
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// - ppuData : Pointer in the PPU memory
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// - size : The number of bytes to transfer
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void ppuDataTransfer(void* const ppuData, void* const cpuData, unsigned int size);
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void ppuDataFetch(void* const cpuData, void* const ppuData, unsigned int size);
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// Transfer a 2x2 tile into the PPU memory
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// - ppuData : Pointer in the PPU memory
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@ -142,8 +142,8 @@ void ppuDataFill(void* const ppuData, char val, unsigned int size) {
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}
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// Transfer a number of bytes from the CPU memory to the PPU memory
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// - cpuData : Pointer to the CPU memory (RAM of ROM)
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// - ppuData : Pointer in the PPU memory
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// - cpuData : Pointer to the CPU memory (RAM of ROM)
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// - size : The number of bytes to transfer
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void ppuDataTransfer(void* const ppuData, void* const cpuData, unsigned int size) {
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ppuDataPrepare(ppuData);
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@ -154,8 +154,8 @@ void ppuDataTransfer(void* const ppuData, void* const cpuData, unsigned int size
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}
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// Transfer a number of bytes from the PPU memory to the CPU memory
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// - ppuData : Pointer in the PPU memory
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// - cpuData : Pointer to the CPU memory (RAM of ROM)
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// - ppuData : Pointer in the PPU memory
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// - size : The number of bytes to transfer
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void ppuDataFetch(void* const cpuData, void* const ppuData, unsigned int size) {
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ppuDataPrepare(ppuData);
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@ -76,6 +76,20 @@ volatile char scroll_x;
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// Scroll y-position
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volatile char scroll_y;
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// Update list with data to be moved to VRAM during blank
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// The data is moved by when lnSync() is called
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// - The format of the update list is an array of unsigned bytes.
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// - There can be 3 different commands in the update list:
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// a) addressHi, addressLo, value
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// b) addressHi|lfHor, addressLo, amountOfBytes, byte1, byte2, byte3, ...
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// c) addressHi|lfVer, addressLo, amountOfBytes, byte1, byte2, byte3, ...
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// - Multiple commands can be queued in one list,
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// but there can only be one activated updatelist at a time.
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// - The end of the list is marked by lfEnd! (important!)
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// - It's the same format that's used in set_vram_update() of Shiru's neslib
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// See https://nesdoug.com/2017/04/13/my-neslib-notes/
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char * volatile vram_update_list;
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// NMI Called when the PPU refreshes the screen (also known as the V-Blank period)
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interrupt(hardware_stack) void vblank() {
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// DMA transfer the entire sprite buffer to the PPU
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@ -130,7 +144,11 @@ ubyte lnSync(ubyte flags) {
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// Update the mode
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sync_mode = flags;
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// Move any pending data to the VRAM
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lnListTransfer();
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// TODO: Handle lfSplit = 2 : activates split mode, NMI waits for SPR0HIT and sets registers
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// Return number of vblank since last sync
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char res = vblank_count;
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vblank_count = 0;
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@ -147,13 +165,11 @@ void lnPush(uword o, ubyte a, void* s) {
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ppuDataTransfer(o, s, a);
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}
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// Write data into nametables, palettes, CHRRAM, etc.
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// Plan a write of data into nametables, palettes, CHRRAM, etc.
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// The data will be written next time lnSync() is called.
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// (Screen has to be visible, doesn't work in blank mode!)
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// updateList: Pointer to update list
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//
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// TODO: void lnList(void* updateList);
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// TODO: enum { lfHor=64, lfVer=128, lfEnd=255 };
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// remarks:
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// - The format of the update list is an array of unsigned bytes.
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// - There can be 3 different commands in the update list:
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@ -164,6 +180,50 @@ void lnPush(uword o, ubyte a, void* s) {
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// but there can only be one activated updatelist at a time.
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// - The end of the list is marked by lfEnd! (important!)
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// - It's the same format that's used in set_vram_update() of Shiru's neslib
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// See https://nesdoug.com/2017/04/13/my-neslib-notes/
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void lnList(void* update_list) {
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vram_update_list = update_list;
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}
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// Execute any planned transfer of data into nametables, palettes, CHRRAM, etc. by lnList()
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void lnListTransfer() {
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if(vram_update_list) {
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// Index into the update list (assumes no more than 256 bytes)
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char idx = 0;
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for(;;) {
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char addrHi = vram_update_list[idx++];
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// Have we reached the end of the lsit
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if(addrHi==0xff) break;
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if(addrHi&lfHor) {
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// The write is horizontal
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char addrLo = vram_update_list[idx++];
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char* ppuAddr = (char*)(uword){ addrHi&0x3f, addrLo };
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char size = vram_update_list[idx++];
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ppuDataTransfer(ppuAddr, vram_update_list+idx, size);
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} else if(addrHi&lfVer) {
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// The write is vertical
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char addrLo = vram_update_list[idx++];
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char* ppuAddr = (char*)(uword){ addrHi&0x3f, addrLo };
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char size = vram_update_list[idx++];
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// Set vertical mode ibit in PPUCTRL
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char ppuCtrl = PPU->PPUCTRL;
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PPU->PPUCTRL = ppuCtrl|4;
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ppuDataTransfer(ppuAddr, vram_update_list+idx, size);
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// restore PPUCTRL
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PPU->PPUCTRL = ppuCtrl;
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} else {
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// The write is single-byte
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char addrLo = vram_update_list[idx++];
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char* ppuAddr = (char*)(uword){ addrHi, addrLo };
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char value = vram_update_list[idx++];
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ppuDataSet(ppuAddr, value);
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}
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}
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// Set update list to zero
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vram_update_list = 0;
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}
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}
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// Scroll background
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@ -39,9 +39,6 @@ void lnPush(uword o, ubyte a, void* s);
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// (Screen has to be visible, doesn't work in blank mode!)
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// updateList: Pointer to update list
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//
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// TODO: void lnList(void* updateList);
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enum { lfHor=64, lfVer=128, lfEnd=255 };
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//
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// remarks:
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// - The format of the update list is an array of unsigned bytes.
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// - There can be 3 different commands in the update list:
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@ -52,7 +49,11 @@ enum { lfHor=64, lfVer=128, lfEnd=255 };
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// but there can only be one activated updatelist at a time.
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// - The end of the list is marked by lfEnd! (important!)
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// - It's the same format that's used in set_vram_update() of Shiru's neslib
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// See https://nesdoug.com/2017/04/13/my-neslib-notes/
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void lnList(void* update_list);
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// Constants used to control VRAM updates in the list passed to lnList()
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enum { lfHor=64, lfVer=128, lfEnd=255 };
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// Common offsets for lnPush() and lnList()
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const uword lnNameTab0=0x2000, lnNameTab1=0x2400, lnNameTab2=0x2800, lnNameTab3=0x2C00,
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49
src/test/kc/complex/lazynes/print.c
Normal file
49
src/test/kc/complex/lazynes/print.c
Normal file
@ -0,0 +1,49 @@
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// lazyNES print demo (using lnlist)
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// lazyNES - As lazy as possible NES hardware support library for vbcc6502
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// (happily cooperates with Shiru's famitone2 replay code)
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// V1.0, 'Lazycow 2020
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// Ported to KickC 2020 by Jesper Gravgaard
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// Original Source VBCC alpha 2 http://www.ibaug.de/vbcc/vbcc6502_2.zip
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#pragma target(nes)
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#include "lazynes.h"
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// A string in ROM
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#pragma data_seg(Data)
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ubyte b_init[]={0,0,10,'B','U','B','B','L','E','S',':',0,0,lfEnd};
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// A string in RAM
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#pragma data_seg(GameRam)
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ubyte b[14];
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// print some text in the static area using lnList
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void Print(uword offset, ubyte value) {
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b[0]=(ubyte)(offset>>8)|lfHor; b[1]=(ubyte)offset; b[11]=b[12]='0';
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while (value>=10) { ++b[11]; value-=10; }
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while (value>=1) { ++b[12]; value-=1; }
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lnList(b);
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}
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int lnMain() {
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// Copy string from ROM to RAM
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for(char i=0;i<sizeof(b_init);i++)
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b[i] = b_init[i];
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static const ubyte bgColors[]={45,33,2};
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ubyte objects=0;
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uword tics=0;
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lnSync(lfBlank); // blank screen to enable lnPush() usage
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lnPush(lnBackCol,3,bgColors); // set background colors
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for(;;) {
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// update the number to display
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tics+=1;
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if (tics>8) {
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tics=0;
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objects = (objects+1)&0x3f;
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}
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// display a number
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Print(lnNameTab0+32,objects+1);
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lnSync(0); // sync with vblank
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}
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return 0;
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}
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@ -11,7 +11,8 @@
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"files.associations": {
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"print.h": "c",
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"printf.h": "c",
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"c64.h": "c"
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"c64.h": "c",
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"sstream": "c"
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},
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"kickassembler.assemblerJar": "/Applications/KickAssembler/KickAss.jar"
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}
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