hex

How to manipulate hexadecimal value in Bash?

二次信任 提交于 2020-12-12 10:23:06
问题 I have a variable with an hexadecimal value: in this example, a byte with value 0xfe: echo $MYVAR | hexdump 0000000 0afe 0000002 I want to use this value on my bash script, in particular I need to: use as a string (echo X$MYVAR should give me Xfe) increment it, (0xff) convert back to the original format (I need to save the incremented value for future use) Maybe it would be easier if I convert it into integer format? EDIT: here is how I initialize the var: printf "\xfe" | dd bs=1 of=tempfile

Hex to Decimal Conversion - PowerShell 5

爱⌒轻易说出口 提交于 2020-12-12 07:43:27
问题 For some reason, when converting some values in PowerShell from Hex to Decimal, I get incorrect value. For example: - Type 0xC0000000 then hit enter, you'll get -1073741824 which is incorrect, the right value is 3221225472 . The answer given is the value for the negative Hex number I entered FFFFFFFFC0000000 I thought this could be an interpretation issue so I explicitly asked to convert the value to from Hex to Base10 (Decimal), I still got the same incorrect answer -1073741824 : [Convert]:

STM32新建keil工程具体步骤

时间秒杀一切 提交于 2020-12-11 12:50:32
1. 新建本地工程文件夹 们在本地电脑上新建一个“工程模板”文件夹,在它之下再新建 6 个文件夹: 2.添加库文件到相应文件夹 把 ST 标准库必要的文件复制到工程模版对应文件夹的目录下 3.KEIL5新建工程 打开 KEIL5,新建一个工程,文件名自拟,工程放在Project目录下。 保存后弹出芯片选择,要根据自己芯片的型号提前按照PACK包,选择型号后点击OK。 随后弹出在线添加库文件,关闭即可。 4.添加组文件夹 在新建的工程中添加常用的文件夹,用来存放不同的文件。 5.添加文件 在新建的工程中添加这些文件,双击组文件夹就会出现添加文件的路径,然后选择文件即可。 6.配置魔术棒选项卡 指定头文件目录 添加预定义宏 可更换芯片型号 microlib 是缺省 C 库的备选库,用到时需要勾选。 勾选后编译生成HEX文件 选择HEX目录,默认Objects 选择调试器 配置调试信息 7.编写main.c 8.构建 有错误或警告时要修改。 9.keil一键下载或mcuisp 软件在线烧录 方法一:keil一键下载 配置好调试信息,使用下载按钮下载到电路板。 方法二:mcuisp 软件在线烧录 打开mcuisp 软件,配置信息,接线,点开始编程。 来源: oschina 链接: https://my.oschina.net/u/4407031/blog/4791941

STM32程序烧录总结

我的梦境 提交于 2020-12-11 06:54:15
1、程序烧录方式   1)ST-LINK下载    2)SWD下载   SWD对应的引脚为:GND、RST、SWDIO、SWDCLK   SWD与Jlink的比较       3)串口下载   串口下载不能直接在MDK点击Download进行下载,要先生成HEX文件,   再通过第三方烧录软件将HEX文件烧录至芯片里。 2、在程序烧录过程中常遇到的一些问题   1)头文件没有被包含,显示缺失某头文件   解决方法:      2)cannot load flash device description(无法加载flash设备)   解决方法:      3)没有安装芯片包   4)没有安装下载器驱动,可以通过驱动人生检测缺失的驱动,再进行安装。 来源: oschina 链接: https://my.oschina.net/u/4291707/blog/3315231

迈来芯melexis氛围灯芯片批量烧录程序解决方案,支持Fast LIN,速度媲美官方烧录器!

拈花ヽ惹草 提交于 2020-12-10 17:50:03
概述 在使用MLX81106/MLX81107/MLX81108/MLX81109/MLX80110芯片开发的车载氛围灯后,需要批量对芯片进行程序烧录,若一对一的烧录方式,其效率是比较低的,而且官方提供的烧录器价格昂贵,软件操作繁琐,且不支持一次性烧录多个芯片,基于此问题我们提供了一种更高效率,操作更简单的程序烧录解决方案,且支持自动测试。 具体实现 硬件连接 将USB转 LIN适配器 的LIN口跟需要烧录程序的芯片LIN接口对接,一个USB转LIN适配器接一个或两个芯片,然后将多个USB转LIN适配器通过USB-HUB连接到电脑,如下示意图: 如图所示,我们可以并联多个适配器实现在软件上同时烧多个芯片,这样可以大大的提高芯片程序烧写效率。目前最新版本软件支持Fast LIN协议,烧写速度跟官方的LIN Master一致,但是我们支持多个适配器并行烧录,所以在烧写效率上将会大大提高。 软件使用 软件使用很简单,主界面如下: 1,烧写设备列表 烧写设备列表是在打开软件时根据当前连接到计算机的LIN适配器自动生成的,连接了多少个设备,那么就会自动生成对应数量的烧写列表; 在每个烧写列表前有个勾选项,若当前通道不使用,则可以去掉勾选,在进行一键烧写的时候就不会对该通道进行任何操作; 节点数即为当前通道LIN总线上所连接的MLX芯片数量,若当前只接了一个芯片,则设置为1即可,若设置大于1

How to check if VARCHAR strings are (not) hexadecimal?

耗尽温柔 提交于 2020-12-10 13:28:29
问题 TL;DR How to test if string is hex when selecting rows? If I had a table with GUIDs where some of them are Base36 instead if hexadecimal: ID | GUID ===|================================= 1 | CAFEBABECAFED00DB16B00B515BADA55 2 | 0123456789ABCDEFGHIJKLMNOPQRSTUV 3 | DEADBEAF4D15EA5EDEFEC8EDFEE1DEAD I want to get all rows with GUIDs that are not exclusively hexadecimal. For a singleton, I could try CONVERT(VARBINARY(32),[GUID],2) and see if it fails, but I can’t to that in a query. If I could

How to check if VARCHAR strings are (not) hexadecimal?

混江龙づ霸主 提交于 2020-12-10 13:22:13
问题 TL;DR How to test if string is hex when selecting rows? If I had a table with GUIDs where some of them are Base36 instead if hexadecimal: ID | GUID ===|================================= 1 | CAFEBABECAFED00DB16B00B515BADA55 2 | 0123456789ABCDEFGHIJKLMNOPQRSTUV 3 | DEADBEAF4D15EA5EDEFEC8EDFEE1DEAD I want to get all rows with GUIDs that are not exclusively hexadecimal. For a singleton, I could try CONVERT(VARBINARY(32),[GUID],2) and see if it fails, but I can’t to that in a query. If I could

Convert binary file to hex notation

。_饼干妹妹 提交于 2020-12-08 05:15:12
问题 I would like to obtain this hex notation for a binary I enter in parameter: The output I obtain and what I want: This is the code I written, I don't have the good hex number (for the part after 5A) , what I am doing wrong ? How to convert properly the byte I read to hex ? Thanks. int main(int argc, char *argv[]) { std::string parameter = "The\\Path\\To\My\exe.exe"; ifstream::pos_type size; char * memblock; ifstream file(parametre, ios::in | ios::binary | ios::ate); if (file.is_open()) { size

Convert binary file to hex notation

旧街凉风 提交于 2020-12-08 05:08:40
问题 I would like to obtain this hex notation for a binary I enter in parameter: The output I obtain and what I want: This is the code I written, I don't have the good hex number (for the part after 5A) , what I am doing wrong ? How to convert properly the byte I read to hex ? Thanks. int main(int argc, char *argv[]) { std::string parameter = "The\\Path\\To\My\exe.exe"; ifstream::pos_type size; char * memblock; ifstream file(parametre, ios::in | ios::binary | ios::ate); if (file.is_open()) { size

How to convert only the integer part of a BigDecimal to hex string?

假装没事ソ 提交于 2020-12-06 07:09:19
问题 I have a number of type BigDecimal, for example 18446744073709551616, and I want to convert it to hexadecimal value. I'm fine with truncating the fractional portion. Is there a way to do this instead of doing it manually? 回答1: Judging by your example you should use BigInteger instead of BigDecimal . This way you could use new BigInteger("18446744073709551616").toString(16) If you can't change type of original object convert it to BigInteger later in method new BigDecimal("18446744073709551616