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Initial work on encoding functions

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This commit is contained in:
Ed Gonzalez 2015-05-27 18:21:27 -05:00
parent 8e033a0610
commit 2b16a3242f
3 changed files with 61 additions and 8 deletions
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4
DSP_API/SmartSDR_Interface/sched_waveform.c
View file

@ -220,7 +220,7 @@ static void* _sched_waveform_thread(void* param)
// ======================= Initialization Section =========================
_dv_serial_fd = openSerial("/dev/ttyUSB0");
_dv_serial_fd = thumbDV_openSerial("/dev/ttyUSB0");
// Initialize the Circular Buffers
@ -485,6 +485,8 @@ static void* _sched_waveform_thread(void* param)
}
/* DECODE */
uint32 encode_out = 0;
encode_out = thumbDV_encode(speech_in, mod_out, 320);
for( i=0 ; i < 320 ; i++)
{

59
DSP_API/ThumbDV/thumbDV.c
View file

@ -62,8 +62,10 @@
#define AMBE3000_HEADER_LEN 4U
#define AMBE3000_START_BYTE 0x61U
#define DEFAULT_PORT 2460U
#define AMBE3000_SPEECHD_HEADER_LEN 3U
#define BUFFER_LENGTH 400U
#define THUMBDV_MAX_PACKET_LEN 2048U
static void delay(unsigned int delay) {
struct timespec tim, tim2;
@ -72,7 +74,6 @@ static void delay(unsigned int delay) {
nanosleep(&tim, &tim2);
};
static void dump(char *text, unsigned char *data, unsigned int length)
{
unsigned int offset = 0U;
@ -115,7 +116,7 @@ static void dump(char *text, unsigned char *data, unsigned int length)
}
int openSerial(const char * tty_name)
int thumbDV_openSerial(const char * tty_name)
{
struct termios tty;
int fd;
@ -163,11 +164,12 @@ int openSerial(const char * tty_name)
n1 = write(fd,reset,5);
output("Wrote Reset %d chars\n",n1);
int ret = thumbDV_processSerial(fd);
return fd;
}
int processSerial(int serial_fd)
int thumbDV_processSerial(int serial_fd)
{
unsigned char buffer[BUFFER_LENGTH];
unsigned int respLen;
@ -215,3 +217,50 @@ int processSerial(int serial_fd)
return 0;
}
int thumbDV_encode(short * speech_in, short * speech_out, uint16 num_of_samples )
{
unsigned char packet[THUMBDV_MAX_PACKET_LEN];
uint16 speech_d_bytes = num_of_samples * sizeof(uint16); /* Should be 2 times the number of samples */
/* Calculate length of packet */
uint16 length = AMBE3000_HEADER_LEN;
/* Includes Channel Field and SpeechD Field Header */
length += AMBE3000_SPEECHD_HEADER_LEN;
length += speech_d_bytes;
/* Will be used to write fields into packet */
unsigned char * idx = &packet[0];
*(idx++) = AMBE3000_START_BYTE;
/* Length split into two bytes */
*(idx++) = length >> 1;
*(idx++) = length & 0xF;
/* SPEECHD Type */
*(idx++) = 0x02;
/* Channel0 Identifier */
*(idx++) = 0x40;
/* SPEEECHD Identifier */
*(idx++) = 0x00;
/* SPEECHD No of Samples */
*(idx++) = num_of_samples >> 1;
*(idx++) = num_of_samples & 0xF;
output("Num of Samples = 0x%X\n", num_of_samples);
*idx = '\0';
output("Encode Packet Header = ");
unsigned char * p = &packet[0];
uint32 i = 0;
for ( i = 0 ; i < 7 ; i++ ){
output("%02X ",*p);
p++;
}
output("\n");
return num_of_samples;
}

6
DSP_API/ThumbDV/thumbDV.h
View file

@ -36,7 +36,9 @@
#ifndef THUMBDV_THUMBDV_
#define THUMBDV_THUMBDV_
int openSerial(const char * tty_name);
int processSerial(int serial_fd);
int thumbDV_openSerial(const char * tty_name);
int thumbDV_processSerial(int serial_fd);
int thumbDV_encode(short * speech_in, short * speech_out, uint16 num_of_samples );
#endif /* THUMBDV_THUMBDV_ */