uart

I am writing a C# application to read from several serial COM ports at the same time to analyze the data communication of an IPOD. The data being sent needs to be interpreted as HEX bytes. For example, 0xFF 0x55 0x01 0x00 0x04 0xC3 0xFF 0x55 ... I want to be able to read this and display it in a rich textbox, for example 0xFF 0x55 0x01 0x00 0x04 0xC3 0xFF 0x55 ... The start of a command includes a header (0xFF 0x55) and the rest is is the command + parameters + checksum. What is the best way to go about this? I currently have: private delegate void SetTextDeleg(string text); void sp

I am trying to force a 9-bit protocol on a UART in embedded Linux. Currently I am testing this out on the am335x_evm board. I am planning on doing this using stick parity. Ideally I was hoping I would not need to actually modify any of the code for the omap-serial.c driver. The reason for the 9-bit protocol is to support some legacy hardware that uses it. The parity bit needs to be 1 for the address portion of the message, 0 for the data portion, then 1 again for the termination byte. I was planning on having a process running in user space that would interface with the UART through standard

I have a uncommon protocol, which requires 9600 baud, 9 bits and one stop bit. I can't find any driver, which can implement this sending/receiving. Can I send something to /dev/tty* for emulating these queries? What should I send? How can I emulate a 9600 baud rate? You can use sticky parity, which is also called MARK and SPACE parity. termios.h supports this. However, you need to change the parity settings before sending address or data bytes accordingly and depending on the hardware, this may introduce undesired delays between two types of bytes. I have experienced delays from 0.4 ms to 10

I searched little bit for emulation of ESC/POS printer, but didn't found any thing more, then data parsers like this . In few words, I have Linux, I have device connected to my PC via UART/RS-232 port. I need some soft, that will listen to specific COM port, and visualize data sent to be printed to this port (in example saves it as PDF). I don't think there is an out of box solution, but if you can capture the data (and it is a simple enough subset of esc/pos) you could then feed it to a tool like esc2html + wkhtmltopdf. https://github.com/receipt-print-hq/escpos-tools https://wkhtmltopdf.org/

基础配置见 ： https://www.cnblogs.com/jsit-dj-it/p/11967153.html 一、配置USART外设的工作参数 二、生成代码 在main.c编写业务逻辑代码 /* USER CODE BEGIN 4 */ void USER_UART_IRQHandler(UART_HandleTypeDef *huart) { /*__HAL_UART_GET_FLAG 获取 SR 寄存器标志位状态 UART_FLAG_RXNE 接受数据寄存器非空标志位 UART_FLAG_RXNE (0x1UL << USART_SR_RXNE_Pos) /*!< 0x00000020 */ UART_RX_STATE_READY=0x00自定义 */ //接收数据 if ((__HAL_UART_GET_FLAG(&huart1, UART_FLAG_RXNE) != RESET)) { //接收到一帧中的第一个字节 if (uart1RxState == UART_RX_STATE_READY) { uart1RxState = UART_RX_STATE_START; __HAL_UART_ENABLE_IT(&huart1, UART_IT_IDLE); uart1RxCounter = 0; uart1RxBuf[uart1RxCounter] =

I am currently using a 16550-compatible UART, and I want to be able to change the FIFO interrupt trigger level (I am dropping bytes under high UART loads and I want to reduce the threshold - it's an underpowered embedded system). Of course, I can change it in the 8250_port.c driver if I want: [PORT_NS16550A] = { .name = "NS16550A", .fifo_size = 16, .tx_loadsz = 16, .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10, .flags = UART_CAP_FIFO | UART_NATSEMI, }, But it would be far more convenient to change it from userspace without having to recompile a kernel. I am hoping that the following