blob: e5ab084dcc74e83876b18cfd54b72f051b02d3ba (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
|
/*---------------------------------------------------------------------------*\
FILE........: adc_rec_usb.c
AUTHOR......: David Rowe
DATE CREATED: Nov 2015
Records a 16 kHz sample rate raw file from one of the ADC channels,
which are connected to pins PA1 (ADC1) and PA2 (ADC2). Uploads to the
host PC via the STM32F4 USB port, which appears as /dev/ttyACM0.
On the SM1000:
ADC1 -> PA1 -> "from radio"
ADC2 -> PA2 -> "mic amp"
I used this to record:
$ sudo dd if=/dev/ttyACM0 of=test.raw count=100
\*---------------------------------------------------------------------------*/
/*
Copyright (C) 2015 David Rowe
All rights reserved.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License version 2.1, as
published by the Free Software Foundation. This program is
distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include <stdlib.h>
#include <math.h>
#include "stm32f4_adc.h"
#include "stm32f4_usb_vcp.h"
#include "sm1000_leds_switches.h"
#define N (ADC_BUF_SZ*6)
/* test tone parameters */
#define FREQ 999.0 /* make sure no alignment with frame boundaries */
#define FS 16000.0
#define AMP 10000.0
extern int adc_overflow1;
extern int adc_overflow2;
int main(void){
short buf[N];
#ifdef TEST_TONE
float phase = 0.0;
float sam;
int i;
#endif
usb_vcp_init();
adc_open(ADC_FS_96KHZ, 4*N, NULL, NULL);
sm1000_leds_switches_init();
/* set up test buffer, lets us test USB comms indep of ADC, record to a file
then play back/examine waveform to make sure no clicks */
while(1) {
while(adc1_read(buf, N) == -1);
#ifdef TEST_TONE
for(i=0; i<N; i++) {
phase += 2.0*M_PI*FREQ/FS;
phase -= 2.0*M_PI*floor(phase/(2.0*M_PI));
sam = AMP*cos(phase);
buf[i] = (short)sam;
}
#endif
led_pwr(1);
VCP_send_buffer((uint8_t*)buf, sizeof(buf));
led_pwr(0);
}
}
|
