Orange Pi Zero Support - Githubissues

f0086 commented 2 years ago

Compiling the example on ss_oled for linux on a Orange Pi Zero (Armbian) fails. To reproduce it:

git clone https://github.com/bitbank2/ss_oled
cd linux
make
make -f make_samples

Results in:

[...]
/usr/bin/ld: /usr/local/lib/libBitBang_I2C.a(BitBang_I2C.o): in function `I2CRead':
BitBang_I2C.c:(.text+0xa6c): undefined reference to `gpioSetMode'
/usr/bin/ld: BitBang_I2C.c:(.text+0xa80): undefined reference to `gpioSetMode'
/usr/bin/ld: BitBang_I2C.c:(.text+0xa9c): undefined reference to `gpioSetMode'
/usr/bin/ld: BitBang_I2C.c:(.text+0xab8): undefined reference to `gpioSetMode'
/usr/bin/ld: BitBang_I2C.c:(.text+0xac0): undefined reference to `gpioSetMode'
/usr/bin/ld: BitBang_I2C.c:(.text+0xad0): undefined reference to `gpioDelay'
[...]

BitBang_I2C (and the pigpio dependency) is installed like this:

wget https://github.com/joan2937/pigpio/archive/master.zip
unzip master.zip
cd pigpio-master
make
sudo make install

git clone https://github.com/bitbank2/BitBang_I2C.git
cd  linux
make

Not sure what causes the error on compiling the ss_oled examples. The OLED Display is in place and works with oled_96 over i2c, channel 0.

orangepizero:~:% sudo i2cdetect -y 0
     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:                         -- -- -- -- -- -- -- -- 
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
30: -- -- -- -- -- -- -- -- -- -- -- -- 3c -- -- -- 
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
70: -- -- -- -- -- -- -- --

bitbank2 commented 2 years ago

looks like you just need to add a -L option in the makefile for the linker to find where pigpio was installed

f0086 commented 2 years ago

No, the problem was the order in which the libs are added in the makefile, so the linker does not drop unknown fields and functions. This is the right order:

LIBS = -lss_oled -lBitBang_I2C -lpigpio -lm -lpthread

But the core problem remains: ss_oled does not work on other Linux devices than an RaspberryPi. I've dig through both libs (BitBang_I2C and pigpio) and find no easy way to make this just use /dev/i2c-0 like the abandon lib oled_96 does. Here the output for the (slightly changed) example:

orangepizero:linux:% cat make_samples
CFLAGS=-c -Wall -O2 -D_LINUX_
LIBS = -lss_oled -lBitBang_I2C -lpigpio -lm -lpthread

all: sample

sample: sample.o
    $(CC) -L/usr/lib sample.o $(LIBS) -o sample

sample.o: sample.c
    $(CC) $(CFLAGS) sample.c

clean:
    rm *.o sample
orangepizero:linux:% cat sample.c
#include <stdint.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <ss_oled.h>

SSOLED ssoled;
unsigned char ucBackBuf[1024];

int main(int argc, char *argv[]) {
    int iChannel = 0;
    int iOLEDAddr = 0x3c;
    int iOLEDType = OLED_128x64;

    if (oledInit(&ssoled, iOLEDType, iOLEDAddr, 1, 0, 1, iChannel, iOLEDAddr, -1, 400000) != OLED_NOT_FOUND) {
        printf("Successfully opened I2C bus");
        oledSetBackBuffer(&ssoled, ucBackBuf);
        oledFill(&ssoled, 0, 1);
        oledWriteString(&ssoled, 0, 3, 2, "Hi!", FONT_LARGE, 0, 1);
        printf("Press ENTER to quit\n");
        getchar();
        oledPower(&ssoled, 0);
    } else {
        printf("Init failed!");
    }
    return 0;
}
orangepizero:linux:% make -f make_samples sample
cc -c -Wall -O2 -D_LINUX_ sample.c
cc -L/usr/lib sample.o -lss_oled -lBitBang_I2C -lpigpio -lm -lpthread -o sample
orangepizero:linux:% sudo ./sample
2022-09-20 22:41:47 gpioHardwareRevision: unknown revision=0
2022-09-20 22:41:47 initCheckPermitted: 
+---------------------------------------------------------+
|Sorry, this system does not appear to be a raspberry pi. |
|aborting.                                                |
+---------------------------------------------------------+

pigpio failed to initialize
Init failed!%                                                                                                                                                                        orangepizero:linux:%

bitbank2 commented 2 years ago

I haven't used non-RPI Linux machines in a while, but I thought I had written replacement functions for the pigpio ones since it doesn't really exist on non-RPI OSs. I can't help you from this point forward. It shouldn't be hard to write the GPIO functions that are missing.

bitbank2 / ss_oled

Orange Pi Zero Support #60