gpio driver

.vscode/settings.json

@@ -0,0 +1,5 @@
+{
+    "files.associations": {
+        "stdbool.h": "c"
+    }
+}

.vscode/tasks.json

@@ -2,16 +2,16 @@
     // See https://go.microsoft.com/fwlink/?LinkId=733558
     // for the documentation about the tasks.json format
     "version": "2.0.0",
-    "type":"shell",
-    "command": "make",
-    "echoCommand": true,
-    "problemMatcher": {
-        "base": "gcc",
-    },
     "tasks": [
         {
             "label": "all",
-            "args": ["all"],
+            "type":"shell",
+            "command": "make all -j4",
+            "problemMatcher": {
+                "base": "gcc",
+                "owner": "gcc",
+                "fileLocation":"absolute"
+            },
             "group": {
                 "kind": "build",
                 "isDefault": true
@@ -19,7 +19,23 @@
         },
         {
             "label": "clean",
-            "args": ["clean"],
+            "type":"shell",
+            "command": "make clean -j4",
+            "problemMatcher": {
+                "base": "gcc",
+                "owner": "gcc",
+                "fileLocation":"absolute"
+            },
+            "group": {
+                "kind": "build",
+                "isDefault": true
+            }
         }
-    ]
+    ],
-}
+    "presentation": {
+        "focus": true,
+        "reveal": "always",
+        "panel": "shared",
+        "clear": true,
+    }
+}

inc/def.h

@@ -1,6 +0,0 @@
-#ifndef __INC_DEF_H__
-#define __INC_DEF_H__
-
-#define HELLO "Hello world!"
-
-#endif // __INC_DEF_H__

inc/gpio.h

@@ -0,0 +1,14 @@
+#ifndef __GPIO_H__
+#define __GPIO_H__
+
+struct gpio {
+    unsigned int pin;
+};
+
+int gpio_open(const struct gpio *gpio);
+int gpio_close(const struct gpio *gpio);
+char gpio_read(const struct gpio *gpio);
+void gpio_write(const struct gpio *gpio, char byte);
+void gpio_toggle(const struct gpio *gpio);
+
+#endif

src/gpio.c

@@ -0,0 +1,64 @@
+#include <stdlib.h>
+#include <syslog.h>
+#include <stdbool.h>
+#include <ftdi.h>
+
+#include <gpio.h>
+
+struct gpio_obj {
+    struct ftdi_context *ftdi;
+    bool is_open;
+};
+
+static struct gpio_obj gpio_obj = {
+    .ftdi = NULL,
+    .is_open = false,
+};
+
+int gpio_open(const struct gpio *gpio)
+{
+    int res;
+    if((gpio_obj.ftdi = ftdi_new()) == 0) {
+        syslog(LOG_ERR, "ftdi_new failed\n");
+        return EXIT_FAILURE;
+    }
+    res = ftdi_usb_open(gpio_obj.ftdi, 0x0403, 0x6001);
+    if (res < 0 && res != -5) {
+        syslog(LOG_ERR, "unable to open ftdi device: %d (%s)\n", res,
+               ftdi_get_error_string(gpio_obj.ftdi));
+        ftdi_free(gpio_obj.ftdi);
+        return EXIT_FAILURE;
+    }
+
+    res = ftdi_set_bitmode(gpio_obj.ftdi, (char)gpio->pin, BITMODE_BITBANG);
+    if(res < 0) {
+        syslog(LOG_ERR, "unable to set bit bang mode: %d (%s)\n", res,
+               ftdi_get_error_string(gpio_obj.ftdi));
+        ftdi_free(gpio_obj.ftdi);
+        return EXIT_FAILURE;
+    }
+    gpio_obj.is_open = true;
+
+    return EXIT_SUCCESS;
+}
+
+int gpio_close(const struct gpio *gpio)
+{
+    ftdi_usb_close(gpio_obj.ftdi);
+    ftdi_free(gpio_obj.ftdi);
+
+    return EXIT_SUCCESS;
+}
+
+char gpio_read(const struct gpio *gpio)
+{
+    return 0;
+}
+
+void gpio_write(const struct gpio *gpio, char byte)
+{
+}
+
+void gpio_toggle(const struct gpio *gpio)
+{
+}

src/main.c

@@ -3,8 +3,6 @@
 #include <syslog.h>
 #include <ftdi.h>
 
-#include <def.h>
-
 #define LED 0x08
 int main(int argc, char *argv[])
 {