Jason jannson

💭

I may be slow to respond.

https://www.linkease.com

jannson / find_files.sh

Last active August 29, 2015 13:57

	find . -path .svn -prune -o -name "*.[ch]" \| grep -v ".svn"
	find . -path .svn -prune -o -name "*.[ch]" \| grep -v ".svn"

	LNX=.
	find $LNX -path "$LNX/arch/" ! -path "$LNX/arch/x86" -prune -o \
	-path "$LNX/Documentation*" -prune -o \
	-path "$LNX/scripts*" -prune -o \
	-path "$LNX/drivers*" -prune -o \
	-name "*.[chxsS]" -print > cscope.files

jannson / imu.c

Created April 1, 2014 02:51

陀螺仪重力传感器融合代码

	//=====================================================================================================
	// IMU.c
	// S.O.H. Madgwick
	// 25th September 2010
	//=====================================================================================================
	// Description:
	//
	// Quaternion implementation of the 'DCM filter' [Mayhony et al].
	//
	// User must define 'halfT' as the (sample period / 2), and the filter gains 'Kp' and 'Ki'.

jannson / simple-kalman-filter.c

Created April 3, 2014 09:53

	/** A simple kalman filter example by Adrian Boeing
	www.adrianboeing.com
	*/

	#include <stdio.h>
	#include <stdlib.h>
	#include <math.h>

	double frand() {
	return 2*((rand()/(double)RAND_MAX) - 0.5);

jannson / mpu6050_dmp.c

Last active January 23, 2018 03:31

打开MPU6050的DMP功能，MPU6050能以400K的速率输出姿态数据（FIFO，一共42个字节）；DMP有个好处，不需要经过复杂的滤波过程，出来的数据，特别是四位元和YRP数据，是直接可用，而且效果比简化KALMAN滤波的要好和稳定，响应速度很快很快；

	---------------------
	/*****************************************************
	http://bbs.cmnxt.com/thread-13197-1-1.html
	Date : 2013-7-2
	Author :
	Chip type : ATmega16
	Program type : Application
	AVR Core Clock frequency: 16.000000 MHz
	Memory model : Small
	External RAM size : 0

jannson / mem_cdev.c

Created May 8, 2014 07:10

字符设备驱动示例

	/* http://blog.chinaunix.net/uid-28732854-id-3858242.html */

	/*****************************memdev.h******************************/
	#ifndef _MEMDEV_H_
	#define _MEMDEV_H_

	#ifndef MEMDEV_MAJOR
	#define MEMDEV_MAJOR 251 /预设的mem的主设备号/
	#endif

jannson / win_del_svn.cmd

Created May 16, 2014 05:12

	for /f "tokens=* delims=" %%i in ('dir /s /b /a:d *svn') do (
	rd /s /q "%%i"
	)

jannson / eep_Makefile

Created May 23, 2014 00:16

package Makefile example in openwrt

	#opt/openwrt/trunk-qemu/package/utils/eep
	include $(TOPDIR)/rules.mk

	PKG_NAME:=eep
	PKG_VERSION:=5.0
	PKG_RELEASE:=1

	PKG_BUILD_DIR:= $(BUILD_DIR)/$(PKG_NAME)

	include $(INCLUDE_DIR)/package.mk

jannson / rootfs_test.c

Last active August 29, 2015 14:01

openwrt kernel test

	//static int __init populate_rootfs(void)

	{/* Just test hear */
	int fd, cnt;
	char* buf = NULL;
	fd = sys_open("/etc/preinit", O_RDONLY, 0);
	buf = (char*)kmalloc(1024, GFP_KERNEL);
	cnt = sys_read(fd, buf, 1024);

	if(cnt == 1024)

jannson / conv.c

Created June 12, 2014 05:59

	/* endian convertor */
	/* use cmp to test it: cmp -l flash flash3 */

	#include <stdio.h>
	#include <stdlib.h>
	#include <stdint.h>
	#include <fcntl.h>
	#include <errno.h>
	#include <sys/types.h>
	#include <unistd.h>

jannson / mt7620a.dts

Created June 23, 2014 05:23

mt7620a dts

	/dts-v1/;

	/include/ "mt7620a.dtsi"

	/ {
	compatible = "ralink,mt7620a-eval-board", "ralink,mt7620a-soc";
	model = "Ralink MT7620A board";

	palmbus@10000000 {
	sysc@0 {