Simple flash LEDs connected to 74HC595 via SPI on Orange Pi Zero
Files:
spiled.c - main applicaton module
stimer.h/stimer.c - simple Linux timer wrapper
sgpio.h/sgpio.c - simple GPIO wrappers to input/output over /sys/class/gpio
spi.h/spi.c - simple Linux wrapper for access to /dev/spidev
Makefie - make file to build example application (spiled)
Makefile.skel - my "universal" Makefile for many projects
Orange Pi Zero 26 pin connector:
| GPIO | Signal | Pin | Pin | Signal | GPIO |
|---|---|---|---|---|---|
| 3.3V | 1 | 2 | 5V | ||
| 12 | SDA.0 | 3 | 4 | 5V | |
| 11 | SCL.0 | 5 | 6 | 0V | |
| 6 | GPIO.7 | 7 | 8 | TxD1 | 198 |
| 0V | 9 | 10 | RxD1 | 199 | |
| 1 | RxD2 | 11 | 12 | GPIO.1 | 7 |
| 0 | TxD2 | 13 | 14 | 0V | |
| 3 | CTS2 | 15 | 16 | GPIO.4 | 19 |
| 3.3v | 17 | 18 | GPIO.5 | 18 | |
| 15 | MOSI | 19 | 20 | 0V | |
| 16 | MISO | 21 | 22 | RTS2 | 2 |
| 14 | SCLK | 23 | 24 | CE0 | 13 |
| 0v | 25 | 26 | GPIO.11 | 10 |
74HC595 DIP16 schematic:
| Signal | Pin | Pin | Signal | Description |
|---|---|---|---|---|
| QB | 1 | 16 | VCC | VCC/GND - power +3.3...+5.0V |
| QC | 2 | 15 | QA | QA...QH - output |
| QD | 3 | 14 | SI | SI - serial data input |
| QE | 4 | 13 | nG | nG - Z output if '1' |
| QF | 5 | 12 | RCK | RCK - storage reg. clock |
| QG | 6 | 11 | SCK | SCK - shift reg. clock |
| QH | 7 | 10 | nSCLR | nSCLR - neg.reset shift reg. |
| GND | 8 | 9 | QH' | QH' - serial data output |
How to connect 74HC595 registor(s) (one or two) to Orange Pi Zero
| 74HC595 signal | 74HC595 pin | Pi Zero pin | Pi zero signal |
|---|---|---|---|
| GND | 8 | 25,20,14,9 or 6 | 0V |
| VCC | 16 | 1 or 17 | 3.3V |
| SI | 14 | 19 | MOSI |
| SCK | 11 | 23 | SCLK |
| RCK | 12 | 18 | GPIO-18 |
| nG | 13 | any 0V/GND | 0V |
| nSCLR | 10 | any 3.3V via pullup R | 3.3V |
| QH' | 9 | to SI of second 74HC595 | - |
How to connect LEDs to 74HC595 (one or two)
8-16 LEDs connected to 15 and 1-7 pins 74HC595 via limit current resistors (~100 Ohm)
How to build application
Install make, gcc and git by apt-get or apitude on you Orange Pi Zero
Clone this git repository from github:
$ git clone https://github.com/azorg/spiled.git
$ cd spiled
Run make in work directory:
$ make
Or use _make.sh:
./_make.sh
How to install and run, programm command line options
Run make install to install to /usr/local/bin
or run ./spiled from current directory.
Run from root or use sudo.
Run: spiled [-options] [interval-ms]
Options:
-h|--help - show this help
-v|--verbose - verbose output
-vv|--more-verbose - more verbose output (or use -v twice)
-vvv|--much-verbose - much more verbose output (or use -v thrice)
-S|--stat - output delay statistic to stdout (no verbose)
-m|--reg-num - number of 74HC595 registors (1 or 2)
-d|--spi-dev - SPI device name like '/dev/spidev0.0'
-s|--spi-speed - SPI max speed [Hz]
-g|--rck-gpio - GPIO channel connected to RCK 74HC595 (-1 to don't use)
-a|--alt-num - alternate mode number (>=0)
-n|--negative - negative output
-r|--real-time - real time mode (root required)
interval-ms - timer interval in ms (100 by default)