ast

Waveshare RTC WatchDog HAT configuration

https://www.waveshare.com/rtc-watchdog-hat.htm

watchdog-device = /dev/watchdog1
interval = 30

ast

typedef struct {
    float attack_rate;
    float decay_rate;
    float reference;
    float max_gain;
    float gain;
} agc_t;

void agc_init(agc_t *agc, float attack_rate, float decay_rate, float reference) {
    agc->attack_rate = attack_rate;

ast

//
//  doublemap.c
//  spieserver
//
//  Created by Albin Stigö on 2019-12-08.
//  Copyright © 2019 Albin Stigo. All rights reserved.
//

#include "doublemap.h"

ast

Experiments with full duplex audio streaming in gstreamer

• Expected behaviour: full duplex stream
• Observed behaviour: does not start sending until data is received.

AUDIO_CAPS="audio/x-raw,format=S16LE,rate=24000"
RTP_CAPS="application/x-rtp,media=(string)audio,clock-rate=(int)48000,encoding-name=(string)OPUS,payload=(int)96"

REMOTE=192.168.1.10

ast

Reverse engineering the Yaesu FC-30

Notes about the Yaesu FC-30 tuner connected to the FT-891 radio. I have not been able to find any information online at all about the propriatry protocol used, so I’m compiling this from my observations.

The ultimate goal of this project is to connect an Icom AH-4 tuner to Yaesu radios.

Data shown is hex. Data in [brackets] are from tuner. Data without brackets are from radio.

Seems tuning is done in three steps:

ast

# Builds GNURadio C++ OOT modules for Raspberry Pi 3

# Created sysroot like this:
# rsync -rl --delete-after --safe-links pi@sdr.local:/{lib,usr} $HOME/src/sysroot

# used clang 7.0 and binutils 2.31

# mkdir build
# cd build
# cmake -DENABLE_DOXYGEN=OFF -DCMAKE_TOOLCHAIN_FILE=~/src/rbpi3.cmake .. 

ast

#if defined(__GNUC__) && !defined(__ARM_NEON__) && !defined(__ARM_NEON)
#error "compiling simd-neon.h requires -mfpu=neon or equivalent"
#endif

void deint_scale_mix(int16_t *frames, float complex *m, float complex *iq
                     *) {
    
    float scale = 1./32767;
    
    /* Deinterleave, scale and mix */

ast

Stepcraft 420 CNC settings with GRBLizer

My notes on getting GRBL v1.1 working with the GRBLizer board.

Setup

• Stepcraft 420 CNC
• Stepcraft drivers with GRBLizer board
• GRBL v1.1

ast

defaults.pcm.rate_converter "speexrate_best"

pcm.funcube {
  type hw
  card V20
  device 0
  rate 192000
  format S16_LE
  channels 2
}

ast

package epoll

import (
	"golang.org/x/sys/unix"
	"os"
)

type Op uint32

const (