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我一直在玩ATtiny's和arduino一段時間，但是在'真正'AVR編程中是一個完整的newbee。 我正在爲我的兒子製造激光槍和目標，並且想要在目標被擊中時讓目標發揮隨機愚蠢的動物聲音。 目標的其他功能由Attiny85s維護，因此我偶然發現了Elm-Chans代碼，用於與Attiny85連接microSD卡並通過PWM播放.wav文件。 然而，代碼被寫入，以便它按順序播放SD卡根文件夾（或其他目錄）上的文件，並響應其中一個引腳上的按鈕跳到下一個文件。 我想要它做的是當按下按鈕時（即擊中目標），從根部選取並播放一個隨機文件。 它應該只播放一次聲音，最好是中斷已經播放的文件，如果在聲音結束之前再次擊中目標，則播放另一個文件。 我一直在努力想弄清楚在代碼中改變什麼，但意識到我需要從頭開始學習從頭開始學習AVR編程......但是這需要一些時間，並且在我到達那裏之前我虛心地希望你們中的任何一位能夠快速給我解決問題並告訴我該怎麼做，這樣我才能完成玩具。 親切的問候 的Mads修改AVR音頻代碼播放隨機軌跡
/*----------------------------------------------------------------------------/
/8-pin SD audio player R0.05d (C)ChaN, 2011 /
/-----------------------------------------------------------------------------/
/This project, program codes and circuit diagrams, is opened under license
/policy of following trems.
/
/Copyright (C) 2010, ChaN, all right reserved.
/
/* This project is a free software and there is NO WARRANTY.
/* No restriction on use. You can use, modify and redistribute it for
/ personal, non-profit or commercial use UNDER YOUR RESPONSIBILITY.
/* Redistributions of source code must retain the above copyright notice.
/
/----------------------------------------------------------------------------*/
#include <avr/io.h>
#include <avr/interrupt.h>
#include <avr/sleep.h>
#include <avr/wdt.h>
#include <string.h>
#include "pff.h"
#include "xitoa.h"
#ifndef MODE
#error Wrong make file.
#endif
#if MODE == 0 /* Single output */
FUSES = {0xE1, 0xDD, 0xFF}; /* Fuse bytes for mono: Low, High and Extended */
#else /* Dual output */
FUSES = {0xE1, 0x7D, 0xFF}; /* Fuse bytes for stereo and mono-HR: Low, High and Extended (*HVS mode only*) */
#endif
/* This is the fuse settings of this project. The fuse data will be included
in the output hex file with program code. However some old flash programmers
cannot load the fuse bits from hex file. If it is the case, remove this line
and use these values to program the fuse bits. */
#define FCC(c1,c2,c3,c4) (((DWORD)c4<<24)+((DWORD)c3<<16)+((WORD)c2<<8)+(BYTE)c1) /* FourCC */
void delay_us (WORD); /* Defined in asmfunc.S */
/*---------------------------------------------------------*/
/* Work Area */
/*---------------------------------------------------------*/
volatile BYTE FifoRi, FifoWi, FifoCt; /* FIFO controls */
BYTE Buff[256]; /* Wave output FIFO */
FATFS Fs; /* File system object */
DIR Dir; /* Directory object */
FILINFO Fno; /* File information */
WORD rb; /* Return value. Put this here to avoid avr-gcc's bug */
/*---------------------------------------------------------*/
static
DWORD load_header (void) /* 0:Invalid format, 1:I/O error, >=1024:Number of samples */
{
DWORD sz, f;
BYTE b, al = 0;
if (pf_read(Buff, 12, &rb)) return 1; /* Load file header (12 bytes) */
if (rb != 12 || LD_DWORD(Buff+8) != FCC('W','A','V','E')) return 0;
for (;;) {
wdt_reset();
pf_read(Buff, 8, &rb); /* Get Chunk ID and size */
if (rb != 8) return 0;
sz = LD_DWORD(&Buff[4]); /* Chunk size */
switch (LD_DWORD(&Buff[0])) { /* Switch by chunk ID */
case FCC('f','m','t',' ') : /* 'fmt ' chunk */
if (sz & 1) sz++; /* Align chunk size */
if (sz > 100 || sz < 16) return 0; /* Check chunk size */
pf_read(Buff, sz, &rb); /* Get content */
if (rb != sz) return 0;
if (Buff[0] != 1) return 0; /* Check coding type (LPCM) */
b = Buff[2];
if (b != 1 && b != 2) return 0; /* Check channels (1/2) */
GPIOR0 = al = b; /* Save channel flag */
b = Buff[14];
if (b != 8 && b != 16) return 0; /* Check resolution (8/16 bit) */
GPIOR0 |= b; /* Save resolution flag */
if (b & 16) al <<= 1;
f = LD_DWORD(&Buff[4]); /* Check sampling freqency (8k-48k) */
if (f < 8000 || f > 48000) return 4;
OCR0A = (BYTE)(F_CPU/8/f) - 1; /* Set sampling interval */
break;
case FCC('d','a','t','a') : /* 'data' chunk */
if (!al) return 0; /* Check if format is valid */
if (sz < 1024 || (sz & (al - 1))) return 0; /* Check size */
if (Fs.fptr & (al - 1)) return 0; /* Check word alignment */
return sz; /* Start to play */
case FCC('D','I','S','P') : /* 'DISP' chunk */
case FCC('L','I','S','T') : /* 'LIST' chunk */
case FCC('f','a','c','t') : /* 'fact' chunk */
if (sz & 1) sz++; /* Align chunk size */
pf_lseek(Fs.fptr + sz); /* Skip this chunk */
break;
default : /* Unknown chunk */
return 0;
}
}
return 0;
}
static
void ramp (
int dir /* 0:Ramp-down, 1:Ramp-up */
)
{
#if MODE != 3
BYTE v, d, n;
if (dir) {
v = 0; d = 1;
} else {
v = 128; d = (BYTE)-1;
}
n = 128;
do {
v += d;
OCR1A = v; OCR1B = v;
delay_us(100);
} while (--n);
#else
dir = dir ? 128 : 0;
OCR1A = (BYTE)dir; OCR1B = (BYTE)dir;
#endif
}
static
FRESULT play (
const char *dir, /* Directory */
const char *fn /* File */
)
{
DWORD sz;
FRESULT res;
BYTE sw;
WORD btr;
wdt_reset();
xsprintf((char*)Buff, PSTR("%s/%s"), dir, fn);
res = pf_open((char*)Buff); /* Open sound file */
if (res == FR_OK) {
sz = load_header(); /* Check file format and ready to play */
if (sz < 1024) return 255; /* Cannot play this file */
FifoCt = 0; FifoRi = 0; FifoWi = 0; /* Reset audio FIFO */
if (!TCCR1) { /* Enable audio out if not enabled */
PLLCSR = 0b00000110; /* Select PLL clock for TC1.ck */
GTCCR = 0b01100000; /* Enable OC1B as PWM */
TCCR1 = MODE ? 0b01100001 : 0b00000001; /* Start TC1 and enable OC1A as PWM if needed */
TCCR0A = 0b00000010; /* Statr TC0 as interval timer at 2MHz */
TCCR0B = 0b00000010;
TIMSK = _BV(OCIE0A);
ramp(1);
}
pf_read(0, 512 - (Fs.fptr % 512), &rb); /* Snip sector unaligned part */
sz -= rb;
sw = 1; /* Button status flag */
do { /* Data transfer loop */
wdt_reset();
btr = (sz > 1024) ? 1024 : (WORD)sz;/* A chunk of audio data */
res = pf_read(0, btr, &rb); /* Forward the data into audio FIFO */
if (rb != 1024) break; /* Break on error or end of data */
sz -= rb; /* Decrease data counter */
sw <<= 1; /* Break on button down */
} while ((PINB & 1) || ++sw != 1);
}
while (FifoCt) ; /* Wait for audio FIFO empty */
OCR1A = 128; OCR1B = 128; /* Return output to center level */
return res;
}
static
void delay500 (void)
{
wdt_reset();
TCCR0B = 0; TCCR0A = 0; /* Stop TC0 */
if (TCCR1) { /* Stop TC1 if enabled */
ramp(0);
TCCR1 = 0; GTCCR = 0;
}
WDTCR = _BV(WDE) | _BV(WDIE) | 0b101; /* Set WDT to interrupt mode in timeout of 0.5s */
set_sleep_mode(SLEEP_MODE_PWR_DOWN); /* Enter power down mode */
sleep_mode();
wdt_reset();
WDTCR = _BV(WDE) | 0b110; /* Set WDT to reset mode in timeout of 1s */
}
EMPTY_INTERRUPT(WDT_vect);
/*-----------------------------------------------------------------------*/
/* Main */
int main (void)
{
FRESULT res;
char *dir;
BYTE org_osc = OSCCAL;
MCUSR = 0;
WDTCR = _BV(WDE) | 0b110; /* Enable WDT reset in timeout of 1s */
PORTB = 0b101001; /* Initialize port: - - H L H L L P */
DDRB = 0b111110;
sei();
for (;;) {
if (pf_mount(&Fs) == FR_OK) { /* Initialize FS */
wdt_reset();
Buff[0] = 0;
if (!pf_open("osccal")) pf_read(Buff, 1, &rb); /* Adjust frequency */
OSCCAL = org_osc + Buff[0];
res = pf_opendir(&Dir, dir = "wav"); /* Open sound file directory */
if (res == FR_NO_PATH)
res = pf_opendir(&Dir, dir = ""); /* Open root directory */
while (res == FR_OK) { /* Repeat in the dir */
res = pf_readdir(&Dir, 0); /* Rewind dir */
while (res == FR_OK) { /* Play all wav files in the dir */
wdt_reset();
res = pf_readdir(&Dir, &Fno); /* Get a dir entry */
if (res || !Fno.fname[0]) break; /* Break on error or end of dir */
if (!(Fno.fattrib & (AM_DIR|AM_HID)) && strstr(Fno.fname, ".WAV"))
res = play(dir, Fno.fname); /* Play file */
}
}
}
delay500(); /* Delay 500ms in low power sleep mode */
}
}
嗨基西爾... thanx爲您的答案和道義上的支持:-)。我得到你的漂移，但不幸的是，我的技能不足以實施它們。但我是否正確地認爲你的建議是在「hit」中斷之前將單個給定文件加載到ram中，然後讓中斷例程播放該文件，並根據卡內容索引中的某些轉換加載另一個文件？ – user2938867