blob: dd28a0f5d8305241148d378414ca1f2f36f44ea6 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
|
-------------------------------------------------------------------------------
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=<hz> --samples 8388608 -p '1=TX' -o <file>.sr
We capture as many samples as fit into the 8MByte buffer of the logic analyzer.
|
