------------------------------------------------------------------------------- Hello World UART output using various options ------------------------------------------------------------------------------- This is a collection of example UART communication (only in one direction). The repeatedly transmitted data is "Hello World!\r\n", using 8n1 settings. The hardware sending the data is an Olimex STM32-H103 eval kit with an ST STM32 (ARM Cortex-M3) microcontroller. The firmware used is based on a simple libopencm3 UART example. The USART1 (USART1.TX pin) is used. For details see: http://libopencm3.org http://libopencm3.git.sourceforge.net/git/gitweb.cgi?p=libopencm3/libopencm3;a=tree;f=examples/stm32/f1/stm32-h103/usart_printf http://olimex.com/dev/stm32-h103.html Logic analyzer setup -------------------- The logic analyzer used for capturing is a ChronoVu LA8 at a sample rate of 5MHz (for baud rates 921600 - 230400), 1MHz (for 115200 - 19200), and 625kHz (for baud rates 9600 - 1200). The ChronoVu LA8 probes were connected to the UART like this: Probe UART ------------------- 0 (green) TX GND GND Data ---- The sigrok command line used was: sigrok-cli -d 0:samplerate= --samples 8388608 -p '1=TX' -o .sr We capture as many samples as fit into the 8MByte buffer of the logic analyzer.