我一直在玩ATtiny和arduino一段时间但是在“真正的”AVR编程中是一个完整的新手。 我正在为我的儿子制作一把激光枪和目标，并希望目标在被击中时发出随机的愚蠢动物声。 目标的其他功能由Attiny85s维护，因此我偶然发现了Elm-Chans代码，用于连接microSD卡和Attiny85并通过PWM播放.wav文件。 但是编写的代码使得它按顺序播放SD卡根文件夹（或其他目录）上的文件，并响应其中一个引脚上的按钮跳到下一个。 我想要它做的是当按下按钮时（即击中目标）从根中挑选和播放随机文件。 它应该只播放一次声音，并且最好中断已播放的文件，如果在声音结束之前再次击中目标则播放另一个。 我一直在努力想弄清楚代码中要改变什么，但是我意识到我需要从头开始学习AVR编程从头开始...但是这需要一些时间，在我到达那里之前我谦卑希望你们任何人都可以给我一个快速解决方案并告诉我该怎么做，所以我可以完成玩具。 亲切的问候 MADS
/*----------------------------------------------------------------------------/
/ 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 */
}
}
答案 0 :(得分：1)
我认为你的案例需要比AVR黑客更多的C编码知识。
下面：
if (!(Fno.fattrib & (AM_DIR|AM_HID)) && strstr(Fno.fname, ".WAV"))
res = play(dir, Fno.fname); /* Play file */
每次找到匹配文件时，都会调用play函数。您想要的是将此文件描述符添加到某些形式的可用文件容器（例如列表）中。列出所有文件后，您可能需要等待外部输入（激光命中），然后播放文件并将当前文件索引移动到下一个。 为了启用暂停和重置播放，我建议使用外部中断来处理“on hit”事件。
PS使用AVR为您的孩子制作玩具？来自我的+1！