working on gpio-sim

docs/CHANGELOG.md

@@ -2,6 +2,17 @@
 
 Noteworthy changes
 
+## 2024-06-29
+
+- acquired an [raxda rock 3c][https://radxa.com/products/rock3/3c/] so i can
+  test on real hardware again. my rasp collection is aging and isn't reliable
+  anymore.
+- did a fedora38 virtual machine and to my happy surprise this version has the
+  gpio-sim kernel module built and offers libgpiod 1.6.4! best of two worlds.
+  pretty soon to tell if our testsuite will run on github actions, but at least
+  i can speed up things a little by coding into this vm instead of the smaller,
+  slower board.
+
 ## 2024-04-20
 
 ## 0.4.3

package.json

@@ -19,6 +19,7 @@
     "configure": "node-gyp configure",
     "build": "node-gyp build",
     "clean": "node-gyp clean",
+    "configure-gpio-sim": "sudo sh test/prepare-gpio-sim.sh",
     "test": "mocha",
     "test:coverage": "nyc npm run test"
   },
@@ -30,5 +31,8 @@
   "dependencies": {
     "bindings": "^1.3.0",
     "nan": "^2.11.1"
+  },
+  "engines": {
+    "node": ">=18"
   }
-}
+}

test/00-misc.js

@@ -8,20 +8,20 @@ describe("libgpiod miscellaneous bindings", function () {
     done();
   });
 
-  xit("should get line instant value", function (done) {
+  it("should get line instant value", function (done) {
     gpiod.getInstantLineValue(0, 17);
     done();
   });
 
-  xit("should NOT get line instant value due wrong chip name", function (done) {
+  it("should NOT get line instant value due wrong chip name", function (done) {
     try {
       const ret = gpiod.getInstantLineValue("/dev/gpiochipZero", 17);
     } catch (ex) {
       done();
     }
   });
 
-  xit("should blink line with instant value", function (done) {
+  it("should blink line with instant value", function (done) {
     let count = 7;
     const interval = setInterval(() => {
       gpiod.setInstantLineValue("/dev/gpiochip0", 17, count-- % 2);

test/01-chip.js

@@ -1,17 +1,17 @@
 const gpiod = require("..");
 
 describe("libgpiod chip bindings", function () {
-  xit("should 'create' a new chip by number", (done) => {
+  it("should 'create' a new chip by number", (done) => {
     const chip0 = new gpiod.Chip("0");
     done();
   });
 
-  xit("should 'create' a new chip by name", (done) => {
+  it("should 'create' a new chip by name", (done) => {
     const chip0 = new gpiod.Chip("gpiochip0");
     done();
   });
 
-  xit("should 'create' a new chip by path", (done) => {
+  it("should 'create' a new chip by path", (done) => {
     const chip0 = new gpiod.Chip("/dev/gpiochip0");
     done();
   });

test/03-pin.js

@@ -4,7 +4,7 @@ const assert = require("assert");
 
 describe("libgpiod Pin sugar", () => {
 
-  xit("should create a Pin fo line 10", done => {
+  xit("should create a Pin for line 10", done => {
     const pin = new gpiod.Pin(10);
     assert(pin instanceof gpiod.Line);
     done();

test/prepare-gpio-sim.sh

@@ -5,14 +5,34 @@
 #
 # Without it all testcases will fail.
 
-# for gpiod 2.x 
+# remember to create the udev rule:
+#  # /etc/udev/rules.d/85-gpiochip.rules 
+#  KERNEL=="gpiochip*", SUBSYSTEM=="gpio", MODE="0660", GROUP="wheel"
+
+# for gpio-sim
 # see https://docs.kernel.org/admin-guide/gpio/gpio-sim.html
+# mount | grep configfs  # provavelmente /sys/kernel/config
 # modprobe gpio-sim
-# mkdir -p /sys/kernel/config/gpio-sim/fakegpio/gpio-bank0/line0
+# mkdir -p /sys/kernel/config/gpio-sim/fakegpio/gpio-bank0/line1
+# mkdir -p /sys/kernel/config/gpio-sim/fakegpio/gpio-bank0/line17
+# mkdir -p /sys/kernel/config/gpio-sim/fakegpio/gpio-bank0/line40
 # echo 1 > /sys/kernel/config/gpio-sim/fakegpio/live
+# gpiodetect 
 # chmod a+rw /dev/gpiochip*
 
-# for gpiod 1.x
+# for gpio-mockup
 # see https://docs.kernel.org/admin-guide/gpio/gpio-mockup.html
 # modprobe gpio-mockup gpio_mockup_ranges=-1,40 gpio_mockup_named_lines
-# 
+# gpiodetect 
+# chmod a+rw /dev/gpiochip*
+
+modprobe gpio-sim
+for i in $(seq 1 40)
+do 
+  mkdir -p /sys/kernel/config/gpio-sim/fakegpio/gpio-bank0/line$i
+done
+echo 1 > /sys/kernel/config/gpio-sim/fakegpio/live
+gpiodetect 
+gpioinfo
+
+echo "run sudo sh -c 'echo 0 > /sys/kernel/config/gpio-sim/fakegpio/live' to modify the simulator setup"