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add docu to hsp hs example

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This commit is contained in:
Milanka Ringwald 2016-03-10 12:29:54 +01:00
parent c27652aa6a
commit 5a1ca5ea9d
1 changed files with 59 additions and 61 deletions
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120
example/embedded/hsp_hs_test.c
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@ -34,29 +34,21 @@
* contact@bluekitchen-gmbh.com
*
*/
// *****************************************************************************
//
// Minimal test for HSP Headset (!! UNDER DEVELOPMENT !!)
//
// Requires HAVE_SCO_OVER_HCI to be defined
//
// Tested working setups:
// - Ubuntu 14 64-bit, CC2564B connected via FTDI USB-2-UART adapter, 921600 baud
// - Ubuntu 14 64-bit, CSR dongle
// - OS X 10.11, CSR dongle
// Broken setups:
// - OS X 10.11, CC2564B connected via FDTI USB-2-UART adapter, 921600 baud
// - select(..) blocks > 400 ms -> num completed is received to late -> gaps between audio
// - looks like bug in select->FTDI driver as it works correct on Linux
//
// SCO not routed over HCI (yet)
// - CSR UART dongle
// - Broadcom USB dongle
// - Broadcom UART chipset
// - ..
/*
* hsp_hs_demo.c
*/
// *****************************************************************************
/* EXAMPLE_START(hsp_hs_demo): HSP Headset Demo
*
* @text This example implements a HSP Headset device that sends and receives
* audio signal over HCI SCO. It demonstrates how to receive
* an output from a remote audio gateway (AG), and,
* if HAVE_STDIO is defined, how to control the AG.
*/
// *****************************************************************************
#include "btstack-config.h"
@ -86,6 +78,29 @@ static char hs_cmd_buffer[100];
static int phase = 0;
/* @section Audio Transfer Setup
*
* @text A pre-computed sine wave (160Hz) is used as the input audio signal. 160 Hz.
* To send and receive an audio signal, HAVE_SCO_OVER_HCI has to be defined.
*
* Tested working setups:
* - Ubuntu 14 64-bit, CC2564B connected via FTDI USB-2-UART adapter, 921600 baud
* - Ubuntu 14 64-bit, CSR dongle
* - OS X 10.11, CSR dongle
*
* Broken setups:
* - OS X 10.11, CC2564B connected via FDTI USB-2-UART adapter, 921600 baud
* - select(..) blocks > 400 ms -> num completed is received to late -> gaps between audio
* - looks like bug in select->FTDI driver as it works correct on Linux
*
* SCO not routed over HCI yet:
* - CSR UART dongle
* - Broadcom USB dongle
* - Broadcom UART chipset
* - ..
*
*/
// input signal: pre-computed sine wave, 160 Hz
static const uint8_t sine[] = {
0, 15, 31, 46, 61, 74, 86, 97, 107, 114,
@ -95,26 +110,6 @@ static const uint8_t sine[] = {
136, 142, 149, 159, 170, 182, 195, 210, 225, 241,
};
#if 0
//
// re-compute sine table for input signal
//
#include <math.h>
#define TABLE_SIZE 50
static uint8_t sine[TABLE_SIZE];
static void compute_signal(void){
#define TABLE_SIZE (50)
// create sine wave table
int i;
printf("static const uint8_t sine[] = {");
for( i=0; i<TABLE_SIZE; i++ ) {
if ((i % 10) == 0) printf("\n ");
sine[i] = (int8_t) (127.0 * sin( ((double)i/(double)TABLE_SIZE) * M_PI * 2. ));
printf("%3u, ", sine[i]);
}
printf("\n};\n");
}
#endif
static void try_send_sco(void){
if (!sco_handle) return;
@ -217,32 +212,35 @@ static void packet_handler(uint8_t * event, uint16_t event_size){
}
}
/* @section Main Application Setup
*
* @text Listing MainConfiguration shows main application code.
* To run a HSP Headset service you need to initialize the SDP, and to create and register HSP HS record with it.
* In this example, the SCO over HCI is used to receive and send an audio signal.
*
* Two packet handlers are registered:
* - The HCI SCO packet handler receives audio data.
* - The HSP HS packet handler is used to trigger sending of audio data and commands to the AG. It also receives the AG's answers.
*
* At the end the Bluetooth stack is started.
*/
/* LISTING_START(MainConfiguration): Setup packet handlers and audio data channel for HSP Headset */
int btstack_main(int argc, const char * argv[]);
int btstack_main(int argc, const char * argv[]){
#ifdef TABLE_SIZE
compute_signal();
#endif
// 8-bit, 2's complement (== int8_t)
// 16-bit samples probably required for USB:
// hci_set_sco_voice_setting(0x0060);
hci_register_sco_packet_handler(&sco_packet_handler);
hci_discoverable_control(1);
hci_ssp_set_io_capability(SSP_IO_CAPABILITY_DISPLAY_YES_NO);
gap_set_local_name("BTstack HSP HS");
hsp_hs_init(rfcomm_channel_nr);
hsp_hs_register_packet_handler(packet_handler);
sdp_init();
memset((uint8_t *)hsp_service_buffer, 0, sizeof(hsp_service_buffer));
memset((uint8_t *)hsp_service_buffer, 0, sizeof(hsp_service_buffer));
hsp_hs_create_sdp_record((uint8_t *)hsp_service_buffer, rfcomm_channel_nr, hsp_hs_service_name, 0);
sdp_register_service_internal(NULL, (uint8_t *)hsp_service_buffer);
hci_register_sco_packet_handler(&sco_packet_handler);
hsp_hs_init(rfcomm_channel_nr);
hsp_hs_register_packet_handler(packet_handler);
gap_set_local_name("BTstack HSP HS");
hci_discoverable_control(1);
hci_ssp_set_io_capability(SSP_IO_CAPABILITY_DISPLAY_YES_NO);
// turn on!
hci_power_control(HCI_POWER_ON);