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Manage the GPIO lines using the Microchip Peripheral I/O Python Package
MPIO is a package that provides easy access to various hardware peripherals found on Microchip AT91/SAMA5 processors.
The API is clean, consistent, flexible, documented, and well tested to
make navigating and exercising even the most complex hardware peripherals a trivial task.
This article explains how to install it on Raspbian distribution on RoadRunner
Installing MPIO
sudo apt update
sudo apt install python-pip
pip install mpio
Examples
Set hi PA25 line for 1 sec
import mpio
import time
gpio = mpio.GPIO(25, mpio.GPIO.OUT)
gpio.set(True)
time.sleep(1)
gpio.set(False)
Read PA25 line state
import mpio
gpio = mpio.GPIO(25, mpio.GPIO.IN)
print gpio.get()
Pin name to Kernel GPIO ID conversion table
// 0 ~ 31 PA0 -> PA31
// 32 ~ 63 PB0 -> PB31
// 33 ~ 95 PC0 -> PC31
// 96 ~ 127 PD0 -> PD31
to convert the MCU pin name to Kernen GPIO id use this function:
def pin2id(pinname):
"""
Return the Kernel ID of any Pin using the MCU name
or the board name
"""
offset=None
if pinname[0:2]=="PA":
offset=0
if pinname[0:2]=="PB":
offset=32
if pinname[0:2]=="PC":
offset=64
if pinname[0:2]=="PD":
offset=96
if offset==None:
return None
else:
return offset+int(pinname[2:4])
example of use (add pin2id function in the following code):
import mpio
import time
gpio = mpio.GPIO(pin2id("PA25"), mpio.GPIO.OUT)
gpio.set(True)
time.sleep(1)
gpio.set(False)
Prepare RoadRunner for Suspend To Ram
import mpio
mpio.DevMem.write_reg(0xfc040018,0x300)
then to enter in Suspend To Ram for 5s:
sudo rtcwake -m mem -s 5
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- CPU Microchip SAMA5D27
- Cortex A5 @ 500 MHz
- Very low power consumption:
396mW in full speed mode
198mW at Linux prompt
17mW in standby mode
10mW in suspend to RAM mode
- Armhf architecture
- DDR3L RAM 256 MB
- QuadSPI 0/16/64/128MB
- Size: 40x30 mm
- Plug-in module
- 200 pins 0.4 mm pitch
- TFT parallel interface
- Boot from internal Quad SPI or external uSD/eMMC
- Linux Kernel 5.15 LTS
- Debian, Buildroot and Yocto
- Open source drivers
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- Single Board Computer based on RoadRunner Linux SOM (Included)
- Classic "Credit Card" form factor
- Two USB Host 2.0 ports (one configurable as USB client on the USB-C connector)
- One 10/100 Mbit/s Lan port
- Two AcmeSensor ports
- Double placements for 2.54mm pitch 20x2 pinstrips (not soldered) for GPIOS, SPI, I2C, Serial etc ports
- Credit Card footprint
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- All the circuitries you need to test the RoadRunner SOM
- USB host, USB device, Ethernet port, MicroSD socket
- Test points for power consumption measurements
- All the Roadrunner signals exposed on 2.54mm pitch pins
- On-board supercap for RTC and backup memory circuit
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