From 17b62545e2aeee0889f294def474861a21f19354 Mon Sep 17 00:00:00 2001
From: drowe67 <drowe67@01035d8c-6547-0410-b346-abe4f91aad63>
Date: Fri, 6 Nov 2015 06:06:51 +0000
Subject: [PATCH] first pass as USB recording working at Fs=16 kHz

git-svn-id: https://svn.code.sf.net/p/freetel/code@2483 01035d8c-6547-0410-b346-abe4f91aad63
---
 codec2-dev/stm32/src/adc_rec_usb.c | 83 ++++++++++++++++++++++++++++++
 codec2-dev/stm32/src/dac_ut_fast.c | 37 +++++++++++++
 2 files changed, 120 insertions(+)
 create mode 100644 codec2-dev/stm32/src/adc_rec_usb.c
 create mode 100644 codec2-dev/stm32/src/dac_ut_fast.c

diff --git a/codec2-dev/stm32/src/adc_rec_usb.c b/codec2-dev/stm32/src/adc_rec_usb.c
new file mode 100644
index 00000000..ef82fc49
--- /dev/null
+++ b/codec2-dev/stm32/src/adc_rec_usb.c
@@ -0,0 +1,83 @@
+/*---------------------------------------------------------------------------*\
+
+  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 "gdb_stdio.h"
+#include "stm32f4xx_gpio.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];
+    float  phase = 0.0;
+    float  sam;
+    int    i;
+
+    usb_vcp_init();
+    adc_open(4*N);
+    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);
+    }
+}
diff --git a/codec2-dev/stm32/src/dac_ut_fast.c b/codec2-dev/stm32/src/dac_ut_fast.c
new file mode 100644
index 00000000..9c750594
--- /dev/null
+++ b/codec2-dev/stm32/src/dac_ut_fast.c
@@ -0,0 +1,37 @@
+/*---------------------------------------------------------------------------*\
+
+  FILE........: dac_ut_fast.c
+  AUTHOR......: David Rowe
+  DATE CREATED: Sep 2015
+
+  Plays a Fs/4 sine wave sampled out of PA5 on a Discovery board, used for 
+  testing high speed DAC operation, e.g. for IF/RF generation.
+
+\*---------------------------------------------------------------------------*/
+
+/*
+  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 <assert.h>
+#include "stm32f4_dac.h"
+
+
+int main(void) {
+    dac_open(4*DAC_BUF_SZ);
+    while (1);
+}
+
-- 
2.25.1