• Serial Port with Pi Zero W

    ronald.sutherland • 05/18/2019 at 19:07 • 0 comments 

    Linux icsp1 4.14.98+ #1200 Tue Feb 12 20:11:02 GMT 2019 armv6l

    RTS and CTS handshake is only valid with uart0, so I need to use the Alt0 pin functions. Unfortunately, raspi-config cannot change the config file at this time.

    sudo systemctl list-units hciuart
sudo systemctl disable hciuart
sudo nano /boot/config.txt 
    dtoverlay=pi3-disable-bt
# Alt0 pin function
dtoverlay=uart0,pin_func=4
# raspi-config can set enable_uart
enable_uart=1

    As the R-Pi Zero W boots up the D1 green LED is dimly lit. Once the overlay is applied D1 turns off, the R-Pi pin has 1.6V at power on and does sink some current. It is acceptable for this application, but that is not how the AVR's or PIC's that I have used power up.

    I did a script so that I can push the bootload button (S1) and run the make bootload rule. I run that script after setting the working folder to the location with the make rule (e.g., change directory to the folder with Makefile).

    Next I have a bootload rule in the RPUno i2c-debug application's Makefile.

    bootload:
    avrdude -v -p $(MCU) -c arduino -P $(BOOTLOAD_PORT) -b 38400 -U flash:w:$(TARGET).hex

    Then ran this bootld.py script on the working folder with that Makefile.

    https://github.com/epccs/Driver/tree/master/ICSP/Bootload

    # build the hex file
make
# run script 
python ~/bin/bootld.py
rsutherland dialout gpio spi
rsutherland dialout gpio spi
avrdude -v -p atmega328p -c arduino -P /dev/ttyAMA0 -b 38400 -U flash:w:I2c-debug.hex

avrdude: Version 6.3-20171130         Copyright (c) 2000-2005 Brian Dean, http://www.bdmicro.com/         Copyright (c) 2007-2014 Joerg Wunsch
         System wide configuration file is "/etc/avrdude.conf"         User configuration file is "/home/rsutherland/.avrduderc"         User configuration file does not exist or is not a regular file, skipping
         Using Port                    : /dev/ttyAMA0         Using Programmer              : arduino         Overriding Baud Rate          : 38400         AVR Part                      : ATmega328P         Chip Erase delay              : 9000 us         PAGEL                         : PD7         BS2                           : PC2         RESET disposition             : dedicated         RETRY pulse                   : SCK         serial program mode           : yes         parallel program mode         : yes         Timeout                       : 200         StabDelay                     : 100         CmdexeDelay                   : 25         SyncLoops                     : 32         ByteDelay                     : 0         PollIndex                     : 3         PollValue                     : 0x53         Memory Detail                 :
                                  Block Poll               Page                       Polled           Memory Type Mode Delay Size  Indx Paged  Size   Size #Pages MinW  MaxW   ReadBack           ----------- ---- ----- ----- ---- ------ ------ ---- ------ ----- ----- ---------           eeprom        65    20     4    0 no       1024    4      0  3600  3600 0xff 0xff           flash         65     6   128    0 yes     32768  128    256  4500  4500 0xff 0xff           lfuse          0     0     0    0 no          1    0      0  4500  4500 0x00 0x00           hfuse          0     0     0    0 no          1    0      0  4500  4500 0x00 0x00           efuse          0     0     0    0 no          1    0      0  4500  4500 0x00 0x00           lock           0     0     0    0 no          1    0      0  4500  4500 0x00 0x00           calibration    0     0     0    0 no          1    0      0     0     0 0x00 0x00           signature      0     0     0    0 no          3    0      0     0     0 0x00 0x00
         Programmer Type : Arduino         Description     : Arduino         Hardware Version: 3         Firmware Version: 6.2         Vtarget         : 0.3 V         Varef           : 0.3 V         Oscillator      : 28.800 kHz         SCK period      : 3.3 us

avrdude: AVR device initialized and ready to accept instructions

Reading | ################################################## | 100% 0.00s

avrdude: Device signature = 0x1e950f (probably m328p)
avrdude: safemode: lfuse reads as 0
avrdude: safemode: hfuse reads as 0
avrdude: safemode: efuse reads as 0
avrdude: NOTE: "flash" memory has been specified, an erase cycle will be performed         To disable this feature, specify the -D option.
avrdude: erasing chip
avrdude: reading input file "I2c-debug.hex"
avrdude: input file I2c-debug.hex auto detected as Intel Hex
avrdude: writing flash (8692 bytes):

Writing | ################################################## | 100% 3.28s

avrdude: 8692 bytes of flash written
avrdude: verifying flash memory against I2c-debug.hex:
avrdude: load data flash data from input file I2c-debug.hex:
avrdude: input file I2c-debug.hex auto detected as Intel Hex
avrdude: input file I2c-debug.hex contains 8692 bytes
avrdude: reading on-chip flash data:

Reading | ################################################## | 100% 2.69s

avrdude: verifying ...
avrdude:...
    Read more »

  • ICSP over SPI with Pi Zero W

    ronald.sutherland • 05/18/2019 at 19:03 • 0 comments

    Lets do a loopback test for SPI, so short MISO to MOSI and power VCC with 5V.

    sudo usermod -a -G spi rsutherland
mkdir spiLoopBack
cd spiLoopBack
wget https://raw.githubusercontent.com/epccs/RPUno/master/SpiSlv/spidev_test.c
gcc -o spidev_test spidev_test.c
./spidev_test -s 1000 -D /dev/spidev0.0
./spidev_test -s 10000 -D /dev/spidev0.0
./spidev_test -s 100000 -D /dev/spidev0.0
./spidev_test -s 250000 -D /dev/spidev0.0
./spidev_test -s 500000 -D /dev/spidev0.0
./spidev_test -s 1000000 -D /dev/spidev0.0
./spidev_test -s 2000000 -D /dev/spidev0.0

    The test output

    spi mode: 0
bits per word: 8
max speed: 500000 Hz (500 KHz)

00 00 00 00 00 00
00 00 00 00 00 00
00 00 00 00 00 00
00 00 00 00 00 00
00 00 00 00 00 00
00 00 00 00 00 00
00 00

    Those should not be zeros. I connected the R-Pi to node MIS0 (note the zero) and the buffer to MISO. After some rework it is passing the loopback test.

    spi mode: 0
bits per word: 8
max speed: 500000 Hz (500 KHz)

FF FF FF FF FF FF
40 00 00 00 00 95
FF FF FF FF FF FF
FF FF FF FF FF FF
FF FF FF FF FF FF
DE AD BE EF BA AD
F0 0D

    Next I have added a linuxspi rule in the RPUpi Remote application's Makefile. I used sudo because of an issue with permissions.

    linuxspi:
	sudo avrdude -v -p $(MCU) -C +$(LIBDIR)/avrdude/328pb.conf -c linuxspi -P /dev/spidev0.0 -e -U flash:w:$(TARGET).hex -U lock:w:0xef:m

    Ran this icsp.py script on the working folder with that Makefile.

    https://github.com/epccs/Driver/tree/master/ICSP/Icsp

    python ~/bin/icsp.py
rsutherland dialout gpio spi
rsutherland dialout gpio spi
sudo avrdude -v -p atmega328pb -C +../lib/avrdude/328pb.conf -c linuxspi -P /dev/spidev0.0 -e -U flash:w:Remote.hex -U lock:w:0xef:m

avrdude: Version 6.3-20171130         Copyright (c) 2000-2005 Brian Dean, http://www.bdmicro.com/         Copyright (c) 2007-2014 Joerg Wunsch
         System wide configuration file is "/etc/avrdude.conf"         User configuration file is "/root/.avrduderc"         User configuration file does not exist or is not a regular file, skipping         Additional configuration file is "../lib/avrdude/328pb.conf"
avrdude: warning at ../lib/avrdude/328pb.conf:4: part m328pb overwrites previous definition /etc/avrdude.conf:8573.
         Using Port                    : /dev/spidev0.0         Using Programmer              : linuxspi         AVR Part                      : ATmega328PB         Chip Erase delay              : 9000 us         PAGEL                         : PD7         BS2                           : PC2         RESET disposition             : dedicated         RETRY pulse                   : SCK         serial program mode           : yes         parallel program mode         : yes         Timeout                       : 200         StabDelay                     : 100         CmdexeDelay                   : 25         SyncLoops                     : 32         ByteDelay                     : 0         PollIndex                     : 3         PollValue                     : 0x53         Memory Detail                 :
                                  Block Poll               Page                       Polled           Memory Type Mode Delay Size  Indx Paged  Size   Size #Pages MinW  MaxW   ReadBack           ----------- ---- ----- ----- ---- ------ ------ ---- ------ ----- ----- ---------           eeprom        65    20     4    0 no       1024    4      0  3600  3600 0xff 0xff           flash         65     6   128    0 yes     32768  128    256  4500  4500 0xff 0xff           lfuse          0     0     0    0 no          1    0      0  4500  4500 0x00 0x00           hfuse          0     0     0    0 no          1    0      0  4500  4500 0x00 0x00           lock           0     0     0    0 no          1    0      0  4500  4500 0x00 0x00           calibration    0     0     0    0 no          1    0      0     0     0 0x00 0x00           signature      0     0     0    0 no          3    0      0     0     0 0x00 0x00           efuse          0     0     0    0 no          1    0      0  4500  4500 0x00 0x00
         Programmer Type : linuxspi         Description     : Use Linux SPI device in /dev/spidev*

avrdude: AVR device initialized and ready to accept instructions

Reading | ################################################## | 100% 0.00s

avrdude: Device signature = 0x1e9516 (probably m328pb)
avrdude: safemode: lfuse reads as FF
avrdude: safemode: hfuse reads as D6
avrdude: safemode: efuse reads as FD
avrdude: erasing chip
avrdude: reading input file "Remote.hex"
avrdude: input file Remote.hex auto detected as Intel Hex
avrdude: writing flash (5792 bytes):

Writing | ################################################## | 100% 1.60s

avrdude: 5792 bytes of flash written
avrdude: verifying flash memory against Remote.hex:
avrdude: load data flash data from input file Remote.hex:
avrdude: input file Remote.hex auto detected as Intel Hex
avrdude: input file Remote.hex contains 5792 bytes
avrdude: reading on-chip flash...
    Read more »