uart | 易学教程

How to set interrupt priorities in Arduino?

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问题 I am working on ESP8266. And I program it directly through FTDI using Arduino IDE. I am having problems with stack when both GPIO and UART interrupt occurs at same time or GPIO event occurs when UART sends or receives something. Is it possible to set interrupt priorities on Arduino?. 回答1: Interrumpts in Arduino have a predefined order of priority that can't be change. Here is is: 1 Reset 2 External Interrupt Request 0 (pin D2) (INT0_vect) 3 External Interrupt Request 1 (pin D3) (INT1_vect) 4

why is there a delay between (DR register written) and (data really showed) in UART on STM32F103CB?

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问题 I'm curious about the delay time between the title mentioned, I toggled an IO when I wrote data into UART->DR, the delay time varies from 3 micro seconds to 10x micro seconds int main(void) { /* initial code generated by STMCubeMX */ HAL_Init(); SystemClock_Config(); MX_GPIO_Init(); MX_USART1_UART_Init(); while (1) { HAL_Delay(50); if (USART_GetFlagStatus(&huart1, USART_SR_TXE) == SET) { USART_SendData(&huart1, 'F'); } } } void USART_SendData(UART_HandleTypeDef *huart, uint16_t Data) { assert

Gtk+ and serial input (UART)

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问题 I have following problem: I receive sensor data via UART (every 10ms) and I want to process this data in gtk. The idea is to process this data in specific time intervalls (e.g. every 100ms). Due to that I use the g_timeout_add() function. The called function contains the common sets for UART communication -> in my case it blocks until I receive 10 chars. And here is the problem - at my read() (-> system call) function the program hang up. My serial settings are as follows: struct termios

GATT profile and UART service

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问题 I am new to developing a mobile app with bluetooth connection to peripheral device. I searched that GATT is the relevant profile used for bluetoothLE communication but our client recommended that we use UART service. Now I am confused as to 1. how these two things are related and 2. Do we have to opt for one of these, if so, what are the pros and cons of each. Thanks 回答1: Legacy Bluetooth provides the serial port profile (SPP) - This is essentially a serial input/output stream over Bluetooth.

GATT profile and UART service

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Where do I read data from UART?

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问题 In my EFM32LG controller I receive UART data from PORT C pin 1 as shown in the table below, which is taken from EFM32LG data sheet. I would like to read the whole byte and decide what LED to blink depending on the received byte. Where can I see the whole received byte? The data sheet is available here. 回答1: You can read the first byte of the received data from from the USARTn_RXDATA register. The registers and functionality of the USART unit are described starting on page 447 of this

C program to send and receive serial(UART) data using COM ports

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问题 I want to communicate between an Embedded device and my PC using C codes for serial-port. Anyone can suggest me how can I send and receive Serial or UART data using COM ports of my computer in Windows Environment(Windows7 or Windows8 64bit). Please give me any link or any codes for suggestion ... Thanks ... 回答1: To connect to the COM port, use CreateFile(): http://support.microsoft.com/kb/115831 Then use ReadFile() or WriteFile() to access the port. 来源： https://stackoverflow.com/questions

serial monitoring method to test communication via com ports without a serial communication device

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问题 I have a Verilog code simulated and synthesized on ISE design toolkit. I've got an FPGA spartan 6 device which is to be used for the implementation. But there is a problem with the device (probably a power issue) which makes the device unavailable in any of the COM ports when I connected it to my PC. So I want to check whether my Matlab code which I made for serial communication through the device does the desired job. So I need a method to test serial communication via any of the COM ports

Receiving a string through UART in STM32F4

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问题 I've written this code to receive a series of char variable through USART6 and have them stored in a string. But the problem is first received value is just a junk! Any help would be appreciated in advance. while(1) { //memset(RxBuffer, 0, sizeof(RxBuffer)); i = 0; requestRead(&dt, 1); RxBuffer[i++] = dt; while (i < 11) { requestRead(&dt, 1); RxBuffer[i++] = dt; HAL_Delay(5); } function prototype static void requestRead(char *buffer, uint16_t length) { while (HAL_UART_Receive_IT(&huart6,

ARM11 S3C6410系列教程之二：串口

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对于一个微处理器，最常用也是最简单的接口就是串口，它不需要太多的管脚，也不需要太多的硬件电路，如果不放心，增加一个max232可以达到万无一失的境地，完成数据的传输。本文引用地址： http://www.eepw.com.cn/article/203123.htm 　　S3C6410拥有187个复用功能的I/O端口，这些端口可以分为17组，具体如下：　　S3C6410X UART 支持的比特率可达到 3Mbps。每个 UART 包含两个 64-byte FIFO ’s用于发送和接收数据。我们可以这样理解，当配置好寄存器后，我们可以从相应的缓存区读取或者发送相应的数据。通过上面的描述可以看出，S3C6410的GPA和GPB为串口。现在我以串口0为例介绍S3C6410的串口如何配置。对与串口0，通过设置GPACON为相应的数据完成串口设置。　　串口0的硬件连接图如下：　　串口0的配置寄存器意义如下：　　通过配置GPACON 寄存器，将端口使能串口模式，　　GPACON &= ~0xff;/*清除寄存器并设置为串口模式*/ 　　GPACON |= 0x22; 　　对于串口的功能设置，通过ULCON0来进行设置，该寄存器意义如下：对于发送和接受的模式设置通过配置UCON0进行设置，该寄存器意义如下：本文引用地址： http://www.eepw.com.cn