uart

How to Read Data from Serial Port in R

徘徊边缘 提交于 2019-12-03 00:41:31
I'm wanting to plot live data from the serial port. I figured R would be a good tool for the job. I'm stumbling on trying to read data from the serial port (COM4). I've verified the data is coming in through terra term (and close the session before trying R), but I can't seem to get anything in R. I've checked a few places, including these threads: How to invoke script that uses scan() on Windows? How to include interactive input in script to be run from the command line I've also found this old thread on the R forum: https://stat.ethz.ch/pipermail/r-help/2005-September/078929.html These have

CC2640R2F&TI-RTOS 拿到 TI CC2640R2F 开发板 第一件事就是移植串口驱动,重定向 printf

匿名 (未验证) 提交于 2019-12-03 00:39:02
/* * board_uart.c * * Created on: 2018年7月3日 * Author: admin */ #include " board_uart.h " #include " board.h " #include <ti/drivers/uart/UARTCC26XX.h> #include <stdlib.h> #include <stdarg.h> #include <stdio.h> #include < string .h> #define UART0_RECEICE_BUFF_SIZE 64 static UART_Handle uart0BoardHandle; static uint8_t uart0ReceiveBuff[UART0_RECEICE_BUFF_SIZE]; static char debugVsprintfBuff[ 256 ] = { 0 }; void bspDebugPrintf( uint32_t enableFlag, char * str, ... ) { /* 打印调试函数,数据发给串口0,2018年7月2日19:07:33 */ va_list argptr; uint32_t len = 0 ; if ( enableFlag != true ) return ; if (strlen(str) > 128

openmv 发送16进制数

匿名 (未验证) 提交于 2019-12-03 00:30:01
openmv发送16进制数据需要转换为字节的形式,假设要发送 0x80,0x06,0x02,0x78这几个16进制数据代码如下: uart = UART ( 3 , 9600 ) #波特率9600 uart. init ( 9600 , bits = 8 , parity = None , stop = 1 ) data=bytearray([0x80,0x06,0x02,0x78]) uart.write(data) 文章来源: openmv 发送16进制数

I2C接口与SPI和UART接口的区别

匿名 (未验证) 提交于 2019-12-02 23:37:01
一、SPI I2C UART通信速率比较: SPI > I2C > UART 1、同步通信>异步通信; 2、同步通信时必须有一根时钟线连接传输的两端; 3、都是串行通信方式,并行通信用于内部存储间的通信,如flash; 4、适合传输的距离和通信速率成反比关系; 3-SPI:两条合一的数据线、1时钟线、1CS(设备片选线) SPI:2数据线、1时钟线、1CS(设备片选线)/串行 同步 通信全双工 I2C:1数据线、1时钟线/串行 同步 通信半双工 传输距离比UART短 UART:2数据线、 1地线/串行 异步 通信全双工 传输距离比I2C长些 (I2C接口是“器件间”接口,是在一块板子之内传输数据) (UART是 “设备间”接口,更多的是用于两台设备之间传输数据) 二、串行和并行、同步和异步的区别: 串行通信:利用一条数据线将数据一位一位的顺序传送,特点是通信线路简单,成本低,适合于长距离传送 并行通信:利用多条数据线将数据的各位同时传送,特点是传输速度快,适合于短距离传送 异步:在一个字符的传输时间范围内保持同步即可 同步:在数据传输过程中,需要一根时钟线同步,IIC总线,SPI总线 三、I2C接口与串行接口的区别: I2C 两线式串行总线 UART 通用串行异步收发器串口,UART是串行异步通信接口,它包括RS232、RS499、RS423、RS422和RS485等接口规范和

linux 串口测试程序

匿名 (未验证) 提交于 2019-12-02 21:59:42
头文件: #ifndef _UART_H_ #define _UART_H_ #include <fcntl.h> #include <termios.h> #include <stdio.h> /* baud rate ============= B600 B1200 B9600 B19200 B38400 B57600 B115200 B230400 B460800 B921600 B1000000 B2000000 B3000000 B4000000 */ /** *@brief set uart port baud rate *@param fd[in] file descriptor of uart port *@param baud[in] baud rate like B9600 *@return none */ void set_baud(int fd, int baud) { int status; struct termios opt; tcgetattr(fd, &opt); tcflush(fd, TCIOFLUSH); cfsetispeed(&opt, baud); cfsetospeed(&opt, baud); status = tcsetattr(fd, TCSANOW, &opt); if (status != 0) { perror(

Emulating UART over USB

百般思念 提交于 2019-12-02 18:37:31
Does anybody know if it's possible to emulate UART (simple serial transmit and receive) over USB? How would this be accomplished? I found this link on the Microchip website, but it's not very forthcoming. http://www.microchip.com/forums/m522571-print.aspx Any ideas? Thanks. Habi Basically you have two options to emulate UART over USB: Use an existing product. The company FTDI provides well known and solid UART-USB bridge chips, e.g. FT230X. Pro: You don't need any detailed knowledge about USB. Cons: Expensive if used in mass production. Additional hardware, needs additional power. Implement

Stop on newline when using read(…)

让人想犯罪 __ 提交于 2019-12-02 17:30:23
问题 I need to read the NMEA sentences from a GPS connected through UART. The OS is Debian, and the language must be C++. To do so I'm opening the file with open(...) and reading a string with read(...) . However, this way I have to specify a string length, which breaks up the sentences. Instead I want to read until the end of the NMEA sentence. How may I use read(...) and stop on new line? Is there an option to read(...) ? 回答1: I need to read the NMEA sentences from a GPS connected through UART.

CSR8675 使用串口 UART 收发功能

冷暖自知 提交于 2019-12-02 15:16:11
CSR8675 使用串口 UART 收发功能 CSR8675 实现 UART 功能有两种方式,一种是 托管连接 ,另一种是 直接连接 。 托管连接:不直接操作 Stream,通过 VM 层创建 Source 和 Sink 来实现数据传输,由库进行处理,实现比较方便。 直接连接:直接操作 Stream ,源是一个存储区域,通过对内存进行操作实现数据传输,处理数据传输效率更高。 此处暂时先用 托管连接 的方式来介绍,后面有空再更新 直接连接 。 1、使用 RAW 传输 在工程属性下,将 Transport 属性改为 RAW。 2、打开调试宏 在 sink_debug.h 中加入调试宏 3、编辑串口代码,实现 loopback 功能 主要实现4个函数 消息处理函数 串口初始化函数 串口接收函数 串口发送函数 <sink_uart.h> # ifndef __UART_H_ # define __UART_H_ void UARTStreamMessageHandler ( Task pTask , MessageId pId , Message pMessage ) ; void uart_data_stream_rx_data ( Source src ) ; void uart_data_stream_tx_data ( const uint8 * data , uint16

Enabling and testing local loop back for UART

放肆的年华 提交于 2019-12-02 09:30:05
问题 I'm trying to do UART internal loop back testing and come up with below changes #include <fcntl.h> #include <stdio.h> #include <termios.h> #include <unistd.h> #include <sys/ioctl.h> #include <sys/mman.h> #include <sys/errno.h> #include <sys/types.h> #include <unistd.h> #define CCSR_BASE 0xfe000000 #define UART1_BASE 0x11c000 #define UART1_LEN 0x1000 static volatile unsigned long *uartReg = MAP_FAILED; /* Map in registers. */ static unsigned long *initMapMem(int fd, unsigned long addr,

Linux Reading Data from UART

只愿长相守 提交于 2019-12-02 03:32:38
问题 I want to read data from UART, i followed this tutorial, the write function works as expected, however i'am getting problem with the read function : This is the uart_init function: void uart_init() { printf("\n +----------------------------------+"); printf("\n | Serial Port Write |"); printf("\n +----------------------------------+"); /*------------------------------- Opening the Serial Port -------------------------------*/ fd = open("/dev/ttyUSB0",O_RDWR | O_NOCTTY| O_SYNC); /* !!blocks