/*
   microphone_demo1 ARM9 Code 
   Chris Double (chris.double@double.co.nz)
   http://www.double.co.nz/nintendo_ds
*/

#include <nds.h>
#include "nds/arm9/console.h"
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "command.h"

static int key_prev = 0;
static int key_curr = 0;

#define KEYS           (*(vuint16*)0x04000130)
#define key_poll() { key_prev=key_curr; key_curr = KEYS; }
#define key_transit(key) ((key_curr^key_prev) & key)
#define key_held(key) (~(key_curr|key_prev) & key)
#define key_hit(key) ((~key_curr&key_prev) & key)
#define key_released(key) ((key_curr&~key_prev) & key)

static int buffer_length = 1000000;
static s8* buffer = 0;
static int recorded_length = 0;
static int recording = 0;

void on_irq() 
{	
  if(REG_IF & IRQ_VBLANK) {
    printf("\x1b[2J");
    printf("Microphone Demo Program\n\n");
    
    printf("Press 'A' to start recording.\n");
    printf("Press 'A' again to stop.\n");
    printf("Press 'B' to playback.\n\n");
    if(recording)
      printf("Recording...\n");
    else
      printf("Recorded %d bytes.\n", recorded_length);
   
    VBLANK_INTR_WAIT_FLAGS |= IRQ_VBLANK;
    REG_IF |= IRQ_VBLANK;   
  }
  else {
    REG_IF = REG_IF;
  }
}

void InitInterruptHandler()
{
  REG_IME = 0;
  IRQ_HANDLER = on_irq;
  REG_IE = IRQ_VBLANK;
  REG_IF = ~0;
  DISP_SR = DISP_VBLANK_IRQ;
  REG_IME = 1;
}

int main(void)
{
  powerON(POWER_ALL);  
  videoSetMode(MODE_0_2D | DISPLAY_BG0_ACTIVE);
  vramSetBankA(VRAM_A_MAIN_BG);
  BG0_CR = BG_MAP_BASE(31);
  BG_PALETTE[255] = RGB15(31,31,31);
  consoleInitDefault((u16*)SCREEN_BASE_BLOCK(31), (u16*)CHAR_BASE_BLOCK(0), 16);

  InitInterruptHandler();
  CommandInit();

  buffer = (s8*)malloc(buffer_length);

  while(1) {
    swiWaitForVBlank();
    key_poll();

    if(!recording && key_hit(KEY_A)) {
      recording = 1;
      CommandStartRecording(buffer, buffer_length);
    }
    else if(recording && key_hit(KEY_A)) {
      recorded_length = CommandStopRecording();
      recording = 0;
    }

    if(key_hit(KEY_B)) {
      CommandPlayOneShotSample(0, 16384, buffer, recorded_length, 0x7f);
    }
  }

  return 0;
}