uart

问题 I'm writing a RS485 driver for an ARM AT91SAM9260 board on Linux. When I initialise the UART, the RTS signal line gets high (1). I guess this would and should be the standard behaviour in RS232 operation mode. In RS485 mode however this is not wanted. I'm using the standard functions provided by the arm-arch section to initialise the UART. Therefore the significant steps are: at91_register_uart(AT91SAM9260_ID_US2, 3, ATMEL_UART_CTS | ATMEL_UART_RTS); //consisting of: // >> configure/mux the

问题 I try to connect my raspberry pi (with raspbian weezy) with a strip LED module. To do this, I use the UART connection of RBPi in order to communicate with RS485 strip connection. My trouble : I can (yes I can) send data but I don't received ACK or anything else. However my strip LED module send data frame to the RBPi (I can see it on oscilloscope). EDIT : I think it's due to the following error that appears when the program opened UART connection. NO : The following error is due to an non

问题 This is a UART transfer between two atmega328p controllers. I am trying to confirm that the data is being properly passed by printing a variable from the data struct on the receiving controller. My terminal is not displaying any information. I can only confirm that the code is being reached from my LED calls, where I enable portB. I am fairly sure my BAUD rate is correct (51 for 8mhz). Also confident the hardware is hooked up properly. Any recommendations on how to debug further to find the

问题 Module does not receive data through UART, help with TinyOS Postby Telosb » Tue Jul 15, 2014 6:47 Dear Memebers, i am new to the tinyos programming. I am working with the KMoteB from: http://www.tinyosmall.com/product_p/100-101.htm I use the YETI2 Plugin and the TinyOS compiler. The problem is, that if i send data via printf through the Serial Interface to the computer, i am able to receive it as sended. On the other hand the PC-to-Mote Communication does not work. The RX LED light up, but

问题 I am collecting 2.4KB(600 bytes * 4) of data from sensors over my MSP430 Controller. And I am using dma to transfer that data over UART to my Linux Processor.Transfer Happens at every 100ms Timer. My DMA setting is as below. DMACTL0 = DMA0TSEL__UCA0TXIFG; DMA0SA = &buff; DMA0DA = &UCA0TXBUF; DMA0SZ = 600; // Block size in bytes DMA0CTL = DMADT_4 | DMASBDB| DMASRCINCR_3 | DMAIE| DMALEVEL_L; // Rpt, inc DMA0CTL|= DMAEN; and my ISR for DMA is as below, __interrupt void DMA_VECTOR_ISR(void) {

问题 #include <fcntl.h> #include <termios.h> #include <unistd.h> #include <errno.h> #include <cerrno> #include <iostream> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <fstream> #include <sys/types.h> #include <sys/socket.h> #include <netinet/in.h> #include <cstdlib> #include <ctime> using namespace std; typedef struct termios ComSet; int main() { int acm=-1; acm=open("/dev/ttyACM0",O_RDWR | O_NOCTTY); if(acm == -1) { cout<<"Error Opening ttyACM0"<<endl; exit(1); } else {

问题 I have a small problem with read-in function in the c++. I'm trying to read in data available on UART's RxD port. when running this code I'm getting result (read <0) hence it displays me an error msg error in read. what should be done to be able read in and display the data from read. I'm sure that there's data available on RxD port I have checked it with oscilloscope. #include <iostream> #include <termios.h> #include <stdio.h> #include <unistd.h> #include <fcntl.h> #include <sys/signal.h>

问题 I am using Telit GL865 GSM Modem with STM32F7 nucleo development board. I make them communicate via USART1. Firstly, I configure the modem with AT commands as below; after that, modem starts to send LCP packages and since I cannot handle them, NO CARRIER message occurs at the end. What I am not sure is that am I applying the right AT commands since it is different than the link I am sharing: https://github.com/espressif/esp-idf/blob/master/examples/protocols/pppos_client/main/pppos_client

问题 I have Raspberry Pi 3 plate with connected USB to UART (COM) converter. The power led on the USB stick is ON. I can not find the converter in Windows Device Portal . In both: connected and disconnected states I see just two UART related records in Device Manager: (ID:ACPI\BCM2835\0, Class:System, Manufacturer:Microsoft, StatusCode:25165834) >BCM283x Mini UART Serial Device (ID:ACPI\BCM2836\0, Class:Ports, Manufacturer:Microsoft, StatusCode:25182218) >ARM PL011 UART Device Driver (ID:ACPI

问题 I am designing a peripheral that draws power from USB port while communicating with a program on Windows. I am planning to use a cheap IC for it (CH340G), however it's configured to open the port in low power mode by default, by setting the MaxPower parameter to 0x30 (96 mA) and it cannot be configured from the IC side. I would save a lot of money if I could change this parameter from computer side. Can this be done, or should I look for another chip? 回答1: No, USB descriptors are read from