T. Meissner tmeissner

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FPGA-Engineer doing design and verification using VHDL, SystemVerilog, SVA and PSL.

tmeissner / gist:4246604

Created December 9, 2012 19:19

Generic function to send commands over the SPI interface of an AVR uC

	// defines for all commands and the max length of spi messages
	#define CHIPERASE "\xc7\x94\x80\x9a"
	#define SPILENGTH 32

	// array to receive data
	unsigned char spi_rxdata[SPILENGTH];

	// transfer a byte on spi
	static unsigned char spi_transfer (unsigned char c) {
	SPDR = c;

tmeissner / file_upload.py

Created December 16, 2012 23:28

Python file upload

tmeissner / file_upload.html

Created December 16, 2012 23:30

HTML file upload

tmeissner / yate.py

Created December 16, 2012 23:34

Yet another template engine: a collection of simple functions to generate HTML content (taken from 'Head first Python' and expanded)

	def start_response(resp="text/html"):
	return('Content-type: ' + resp + '\n\n')

	def html_header(title="default"):
	return("""
	<head>
	<meta charset="utf-8" />
	<title>""" + title + """</title>
	</head>"""
	)

tmeissner / avr_fifo.c

Last active March 13, 2022 02:42

Fifo implementation for AVR 8-bit controller

	struct fifo {
	uint8_t size; /* size of buffer in bytes */
	uint8_t read; /* read pointer */
	uint8_t write; /* write pointer */
	unsigned char buffer[]; /* fifo ring buffer */
	};

	/* define a FIFO type for 'size' bytes */
	#define MK_FIFO(size) \
	struct fifo_ ## size { \

tmeissner / w1-therm.sh

Last active June 1, 2020 06:09

Bash script to read out the DS18B20 1wire temp sensor. You have to modprobe the w1-gpio and w1-therm modules before using it.

	#!/bin/bash

	THERM=$(cat $1)
	CPU=$(cat /sys/class/thermal/thermal_zone0/temp)

tmeissner / w1-mail.sh

Last active December 19, 2015 16:39

Spam yourself with eMails containing the temperature measured by your 1wire temperature sensor ;)

tmeissner / raspifoto.sh

Created July 21, 2013 10:27

Take a foto with the camera board and save it under name with date in it

	#!/bin/bash

	raspistill -t 100 -vf -hf -q 50 -o $(date +%Y-%m-%d-%T).jpg

tmeissner / raspiTemp.js

Last active December 20, 2015 08:49

draw a nice chart of measured temperatures with the help of highchart.js

	// variable to en-/disable debug
	// set to 1 to enable debug log
	if (DEBUG === undefined) {
	var DEBUG = 0;
	}



	// wrap all in anonymous function to get out of global scope
	(function () {

tmeissner / raspiweb.py

Last active December 20, 2015 09:40

python cgi script to generate temperature data in JSON format