RiceGolombDPCM_Player - For BU9480F D-A Conv.

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xeye_ atsu / Mbed 2 deprecated RiceGolombDPCM_Player

For BU9480F D-A Conv.

main.cpp@3:64c3ed0fc4b4, 2010-09-11 (annotated)

Committer:: lynxeyed_atsu
Date:: Sat Sep 11 11:23:26 2010 +0000
Revision:: 3:64c3ed0fc4b4
Parent:: 2:baf5bf51cd28

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User	Revision	Line number	New contents of line
lynxeyed_atsu	0:805cffac956b	1	/* DPCM & Rice Golomb Lossless Audio Player and Realtime encoder */
lynxeyed_atsu	1:02bfb013660c	2	#include "SDHCFileSystem.h"
lynxeyed_atsu	0:805cffac956b	3	#include "mbed.h"
lynxeyed_atsu	0:805cffac956b	4	#include "string"
lynxeyed_atsu	3:64c3ed0fc4b4	5	#include "_bitio.h"
lynxeyed_atsu	1:02bfb013660c	6
lynxeyed_atsu	0:805cffac956b	7	//FILE infp,outfp;
lynxeyed_atsu	1:02bfb013660c	8	SDFileSystem sd(p5, p6, p7, p8, "sd");
lynxeyed_atsu	0:805cffac956b	9	DigitalOut led1(LED1);
lynxeyed_atsu	0:805cffac956b	10	DigitalOut led2(LED2);
lynxeyed_atsu	0:805cffac956b	11	AnalogOut DACout(p18);
lynxeyed_atsu	0:805cffac956b	12	Ticker tick;
lynxeyed_atsu	0:805cffac956b	13
lynxeyed_atsu	3:64c3ed0fc4b4	14	// BU9480F define
lynxeyed_atsu	3:64c3ed0fc4b4	15	SPI bu9480f(p11,p12,p13);
lynxeyed_atsu	3:64c3ed0fc4b4	16	DigitalOut LRCLK(p14);
lynxeyed_atsu	3:64c3ed0fc4b4	17	// BU9480F define.end
lynxeyed_atsu	3:64c3ed0fc4b4	18
lynxeyed_atsu	3:64c3ed0fc4b4	19
lynxeyed_atsu	0:805cffac956b	20	// a FIFO for the DAC
lynxeyed_atsu	3:64c3ed0fc4b4	21	#define TXFIFO_FULL 1
lynxeyed_atsu	3:64c3ed0fc4b4	22	#define RAM_LENGTH 8192//8192
lynxeyed_atsu	1:02bfb013660c	23	#define RAM_LIMIT (RAM_LENGTH - 1)
lynxeyed_atsu	1:02bfb013660c	24	volatile short DAC_fifo[RAM_LENGTH];
lynxeyed_atsu	0:805cffac956b	25	volatile short DAC_wptr=0;
lynxeyed_atsu	0:805cffac956b	26	volatile short DAC_rptr=0;
lynxeyed_atsu	0:805cffac956b	27	volatile short DAC_on;
lynxeyed_atsu	3:64c3ed0fc4b4	28	volatile short DAC_diff=0;
lynxeyed_atsu	0:805cffac956b	29
lynxeyed_atsu	0:805cffac956b	30	void dac_out()
lynxeyed_atsu	0:805cffac956b	31	{
lynxeyed_atsu	0:805cffac956b	32	// printf("\t%d\r\n",DAC_diff);
lynxeyed_atsu	3:64c3ed0fc4b4	33	if (DAC_diff > 1) {
lynxeyed_atsu	3:64c3ed0fc4b4	34	led2 = 0;
lynxeyed_atsu	3:64c3ed0fc4b4	35
lynxeyed_atsu	3:64c3ed0fc4b4	36	LRCLK = 0;
lynxeyed_atsu	3:64c3ed0fc4b4	37	bu9480f.write(DAC_fifo[DAC_rptr++]);
lynxeyed_atsu	3:64c3ed0fc4b4	38	DAC_rptr &= RAM_LIMIT;
lynxeyed_atsu	3:64c3ed0fc4b4	39
lynxeyed_atsu	3:64c3ed0fc4b4	40	LRCLK = 1;
lynxeyed_atsu	3:64c3ed0fc4b4	41	bu9480f.write(DAC_fifo[DAC_rptr++]);
lynxeyed_atsu	3:64c3ed0fc4b4	42	DAC_rptr &= RAM_LIMIT;
lynxeyed_atsu	3:64c3ed0fc4b4	43
lynxeyed_atsu	3:64c3ed0fc4b4	44	DAC_diff-=2;
lynxeyed_atsu	3:64c3ed0fc4b4	45
lynxeyed_atsu	0:805cffac956b	46	}else led2 = 1;
lynxeyed_atsu	0:805cffac956b	47	}
lynxeyed_atsu	3:64c3ed0fc4b4	48
lynxeyed_atsu	0:805cffac956b	49	void encode(long int n){
lynxeyed_atsu	0:805cffac956b	50	int zero_shift = 0;
lynxeyed_atsu	0:805cffac956b	51
lynxeyed_atsu	0:805cffac956b	52	if(n < 0){
lynxeyed_atsu	0:805cffac956b	53	putbit(0); // sign (put 0:if n as negative)
lynxeyed_atsu	0:805cffac956b	54	n = -n; // n = abs(n)
lynxeyed_atsu	0:805cffac956b	55	//printf("\t 0");
lynxeyed_atsu	0:805cffac956b	56	}
lynxeyed_atsu	0:805cffac956b	57	else{
lynxeyed_atsu	0:805cffac956b	58	putbit(1); // sign (put 1:if n as positive)
lynxeyed_atsu	0:805cffac956b	59	//printf("\t 1");
lynxeyed_atsu	0:805cffac956b	60	}
lynxeyed_atsu	0:805cffac956b	61	zero_shift = (n >> (k));
lynxeyed_atsu	0:805cffac956b	62	//printf("\t shift= %d",zero_shift);
lynxeyed_atsu	0:805cffac956b	63	while(zero_shift > 0){
lynxeyed_atsu	0:805cffac956b	64
lynxeyed_atsu	0:805cffac956b	65	zero_shift--;
lynxeyed_atsu	0:805cffac956b	66	putbit(0);
lynxeyed_atsu	0:805cffac956b	67	} // put n/(2^k) 0's
lynxeyed_atsu	0:805cffac956b	68
lynxeyed_atsu	0:805cffac956b	69	putbit(1); // terminating "1"
lynxeyed_atsu	0:805cffac956b	70	putbits(k,rightbits(k,n));
lynxeyed_atsu	0:805cffac956b	71	//printf("\t finish= %d \r\n",(n & ((1U<<k)-1)));
lynxeyed_atsu	0:805cffac956b	72	}
lynxeyed_atsu	0:805cffac956b	73
lynxeyed_atsu	0:805cffac956b	74
lynxeyed_atsu	0:805cffac956b	75
lynxeyed_atsu	0:805cffac956b	76	void decode(void){
lynxeyed_atsu	3:64c3ed0fc4b4	77	//short dac_data;
lynxeyed_atsu	0:805cffac956b	78	long int decode_buff;
lynxeyed_atsu	0:805cffac956b	79	short diff,diff2;
lynxeyed_atsu	0:805cffac956b	80	unsigned int buff_sign,zero_shift;
lynxeyed_atsu	0:805cffac956b	81	//char flag;
lynxeyed_atsu	3:64c3ed0fc4b4	82
lynxeyed_atsu	0:805cffac956b	83	diff = 0;
lynxeyed_atsu	0:805cffac956b	84	diff2 = 0;
lynxeyed_atsu	0:805cffac956b	85	// get sign(1 for positive, 0 for negative)
lynxeyed_atsu	0:805cffac956b	86	while(1){
lynxeyed_atsu	0:805cffac956b	87
lynxeyed_atsu	0:805cffac956b	88	if((buff_sign = getbit())==OVERRUN)break;
lynxeyed_atsu	0:805cffac956b	89	zero_shift = 0;
lynxeyed_atsu	0:805cffac956b	90	while(getbit()==0)zero_shift++;
lynxeyed_atsu	0:805cffac956b	91
lynxeyed_atsu	0:805cffac956b	92	decode_buff = (signed int)((1U << k)*zero_shift);
lynxeyed_atsu	0:805cffac956b	93	decode_buff += (getbits(k));
lynxeyed_atsu	0:805cffac956b	94
lynxeyed_atsu	0:805cffac956b	95	if(!buff_sign)decode_buff =- decode_buff;
lynxeyed_atsu	0:805cffac956b	96	/* return decode_buff; */
lynxeyed_atsu	0:805cffac956b	97	diff =(diff + decode_buff);
lynxeyed_atsu	3:64c3ed0fc4b4	98	DAC_fifo[DAC_wptr++]=(short)diff;
lynxeyed_atsu	3:64c3ed0fc4b4	99	DAC_wptr &= RAM_LIMIT;
lynxeyed_atsu	3:64c3ed0fc4b4	100	//DAC_diff++;
lynxeyed_atsu	1:02bfb013660c	101	while (DAC_diff > RAM_LIMIT){
lynxeyed_atsu	0:805cffac956b	102	led1 = 1;
lynxeyed_atsu	0:805cffac956b	103	} //wait
lynxeyed_atsu	0:805cffac956b	104	led1=0;
lynxeyed_atsu	0:805cffac956b	105
lynxeyed_atsu	0:805cffac956b	106	if((buff_sign = getbit())==OVERRUN)break;
lynxeyed_atsu	0:805cffac956b	107	zero_shift = 0;
lynxeyed_atsu	0:805cffac956b	108	while(getbit()==0)zero_shift++;
lynxeyed_atsu	0:805cffac956b	109
lynxeyed_atsu	0:805cffac956b	110	decode_buff = (signed int)((1U << k)*zero_shift);
lynxeyed_atsu	0:805cffac956b	111	decode_buff += (getbits(k));
lynxeyed_atsu	0:805cffac956b	112
lynxeyed_atsu	0:805cffac956b	113	if(!buff_sign)decode_buff =- decode_buff;
lynxeyed_atsu	0:805cffac956b	114	/* return decode_buff; */
lynxeyed_atsu	0:805cffac956b	115	diff2 =(diff2 + decode_buff);
lynxeyed_atsu	0:805cffac956b	116
lynxeyed_atsu	3:64c3ed0fc4b4	117	DAC_fifo[DAC_wptr++]=(short)diff2;
lynxeyed_atsu	3:64c3ed0fc4b4	118	DAC_wptr &= RAM_LIMIT;
lynxeyed_atsu	3:64c3ed0fc4b4	119	DAC_diff+=2;
lynxeyed_atsu	3:64c3ed0fc4b4	120
lynxeyed_atsu	3:64c3ed0fc4b4	121	while (DAC_diff > RAM_LIMIT){
lynxeyed_atsu	3:64c3ed0fc4b4	122	led1 = 1;
lynxeyed_atsu	3:64c3ed0fc4b4	123	} //wait
lynxeyed_atsu	3:64c3ed0fc4b4	124	led1=0;
lynxeyed_atsu	0:805cffac956b	125
lynxeyed_atsu	0:805cffac956b	126
lynxeyed_atsu	0:805cffac956b	127
lynxeyed_atsu	0:805cffac956b	128	}
lynxeyed_atsu	0:805cffac956b	129	}
lynxeyed_atsu	1:02bfb013660c	130
lynxeyed_atsu	1:02bfb013660c	131
lynxeyed_atsu	1:02bfb013660c	132	int main() {
lynxeyed_atsu	1:02bfb013660c	133
lynxeyed_atsu	1:02bfb013660c	134
lynxeyed_atsu	1:02bfb013660c	135	if ( NULL == (infp = fopen( "/sd/test.rgm", "rb" )) ) {
lynxeyed_atsu	1:02bfb013660c	136	printf( "\r\nError: The message file cannot be accessed\r\n" );
lynxeyed_atsu	1:02bfb013660c	137	return -1;
lynxeyed_atsu	1:02bfb013660c	138	}
lynxeyed_atsu	3:64c3ed0fc4b4	139	// bu9480f init
lynxeyed_atsu	3:64c3ed0fc4b4	140	bu9480f.format(16,0);
lynxeyed_atsu	3:64c3ed0fc4b4	141	bu9480f.frequency(16000000); //16MHz
lynxeyed_atsu	3:64c3ed0fc4b4	142	// bu9480f init.end
lynxeyed_atsu	3:64c3ed0fc4b4	143
lynxeyed_atsu	3:64c3ed0fc4b4	144
lynxeyed_atsu	3:64c3ed0fc4b4	145	tick.attach_us(&dac_out, 41); //set 24.000kHz sampling data
lynxeyed_atsu	1:02bfb013660c	146	decode();
lynxeyed_atsu	1:02bfb013660c	147	tick.detach();
lynxeyed_atsu	1:02bfb013660c	148
lynxeyed_atsu	1:02bfb013660c	149	fclose( infp );
lynxeyed_atsu	1:02bfb013660c	150	//fclose( outfp );
lynxeyed_atsu	1:02bfb013660c	151
lynxeyed_atsu	1:02bfb013660c	152
lynxeyed_atsu	1:02bfb013660c	153
lynxeyed_atsu	1:02bfb013660c	154	while (1);
lynxeyed_atsu	1:02bfb013660c	155	}
lynxeyed_atsu	1:02bfb013660c	156

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Type:	Program
Mbed OS support:	Mbed 2 deprecated
Created:	26 Aug 2010
Imports:	9
Forks:	0
Commits:	4
Dependents:	0
Dependencies:	1
Followers:	1

main.cpp@3:64c3ed0fc4b4, 2010-09-11 (annotated)

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