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MP-0-files/sw/nes_bootloader/src/NESCore_Callback.c

+/*****************************************************************************
+ * Joseph Zambreno
+ * Phillip Jones
+ *
+ * Department of Electrical and Computer Engineering
+ * Iowa State University
+ *****************************************************************************/
+
+/*****************************************************************************
+ * NESCore_Callback.c - Implements the NESCore emulator callback functions, 
+ * e.g. for polling controller input, displaying out, playing sound. Implement
+ * the main emulation interfacing here. 
+ *
+ *
+ * NOTES:
+ * 10/25/13 by JAZ::Design created.
+ *****************************************************************************/
+
+#include "nes_bootloader.h"
+#include "NESCore_Callback.h"
+#include "NESCore.h"
+#include <stdlib.h>
+
+// The main output frame callback. Copy the results into the front-buffer.
+// Note that the NES (and the emulator) outputs essentially a 256x240 image.
+// Your challenge is to figure out how to map that to your 640x480 framebuffer.
+void NESCore_Callback_OutputFrame(word *WorkFrame) {
+
+	extern uint16_t NesPalette3[];
+	uint32_t i, j;
+	uint16_t *ptr = (uint16_t *)FBUFFER_BASEADDR;
+	uint16_t tpixel;
+
+
+	for (i = 0 ; i < NES_DISP_HEIGHT; i++) {
+
+		for (j = 0; j < NES_DISP_WIDTH; j++) {
+
+			// Grab a temporary pixel using the color palette lookup table.
+			tpixel = NesPalette3[WorkFrame[NES_DISP_WIDTH*i+j]];
+
+		}
+
+	}
+  
+	// Flush the cache since VDMA does not play nicely with the cache
+    Xil_DCacheFlush();
+
+	return;
+}
+
+
+// Main input callback. Overwite the passed-by references pad1 and pad2 
+// values, presumably using the buttons and switches on your ZedBoard.
+void NESCore_Callback_InputPadState(dword *pdwPad1, dword *pdwPad2) {
+
+	// Currently hard-coded so that player 1 is pressing A and B, and player 2 is pressing nothing.
+	*pdwPad1 = NCTL_A | NCTL_B;
+	*pdwPad2 = 0;
+
+	return;
+}
+
+
+
+// Initialize the sound playback device. Ignore all the sound functions for now.
+void NESCore_Callback_InitSound(void) {
+
+  return;
+}
+
+// Configure the sound playback device
+int  NESCore_Callback_OpenSound(int nSamplesPerSync, int nSampleRate) {
+
+
+  return 0;
+}
+
+// Close the sound playback device
+void NESCore_Callback_CloseSound(void) {
+
+  return;
+}
+
+
+// Main sound playback function. It is possible that this code should just
+// write to a software FIFO, with a new interrupt handler to stream in the
+// appropriate burst of samples. It would seem likely that the interrupt
+// handler would slow down the NES emulation, but otherwise we have to put a 
+// "wait" statement which would also bog it down. Audio should not get laggy
+// unless there is some bug in the NESCore in terms of how it generates frames
+void NESCore_Callback_OutputSample(int nSamples, byte *channel1, 
+				   byte *channel2, byte *channel3, 
+				   byte *channel4, byte *channel5) {
+
+  return;
+}
+
+
+inline void play_next_squeue() {
+
+
+  return;
+
+}
+
+
+
+
+// Define the global NES pallete array here. This would not be needed
+// if we build a custom nes-specific display controller.
+
+word NesPalette[64] = {
+  1, 2, 3, 4, 5, 6, 7, 8, 9, 
+  10, 11, 12, 13, 14, 15, 16, 17, 18, 19,
+  20, 21, 22, 23, 24, 25, 26, 27, 28, 29,
+  30, 31, 32, 33, 34, 35, 36, 37, 38, 39,
+  40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 
+  50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 
+  60, 61, 62, 63, 64};
+
+
+// Improved NES Palette
+uint32_t NesPalette2[65] = {
+  0x000000,
+  0x808080, 0x003da6, 0x0012b0, 0x440096,
+  0xa1005e, 0xc70028, 0xba0600, 0x8c1700,
+  0x5c2f00, 0x104500, 0x054a00, 0x00472e,
+  0x004166, 0x000000, 0x050505, 0x050505,
+  0xc7c7c7, 0x0077ff, 0x2155ff, 0x8237fa,
+  0xeb2fb5, 0xff2950, 0xff2200, 0xd63200,
+  0xc46200, 0x358000, 0x058f00, 0x008a55,
+  0x0099cc, 0x212121, 0x090909, 0x090909,
+  0xffffff, 0x0fd7ff, 0x69a2ff, 0xd480ff,
+  0xff45f3, 0xff618b, 0xff8833, 0xff9c12,
+  0xfabc20, 0x9fe30e, 0x2bf035, 0x0cf0a4,
+  0x05fbff, 0x5e5e5e, 0x0d0d0d, 0x0d0d0d,
+  0xffffff, 0xa6fcff, 0xb3ecff, 0xdaabeb,
+  0xffa8f9, 0xffabb3, 0xffd2b0, 0xffefa6,
+  0xfff79c, 0xd7e895, 0xa6edaf, 0xa2f2da,
+  0x99fffc, 0xdddddd, 0x111111, 0x111111
+};
+
+// 16-bit version of the improved NES Palette
+uint16_t NesPalette3[65] = {
+		0x0000, 0x0888, 0x0A30, 0x0B10, 0x0904,
+		0x050A, 0x020C, 0x000B, 0x0018, 0x0025,
+		0x0041, 0x0040, 0x0240, 0x0640, 0x0000,
+		0x0000, 0x0000, 0x0CCC, 0x0F70, 0x0F52,
+		0x0F38, 0x0B2E, 0x052F, 0x002F, 0x003D,
+		0x006C, 0x0083, 0x0080, 0x0580, 0x0C90,
+		0x0222, 0x0000, 0x0000, 0x0FFF, 0x0FD0,
+		0x0FA6, 0x0F8D, 0x0F4F, 0x086F, 0x038F,
+		0x019F, 0x02BF, 0x00E9, 0x03F2, 0x0AF0,
+		0x0FF0, 0x0555, 0x0000, 0x0000, 0x0FFF,
+		0x0FFA, 0x0FEB, 0x0EAD, 0x0FAF, 0x0BAF,
+		0x0BDF, 0x0AEF, 0x09FF, 0x09ED, 0x0AEA,
+		0x0DFA, 0x0FF9, 0x0DDD, 0x0111, 0x0111};