GPIO_FTDI

Gpio driver using ftdi usb chips e.g.:

$ lsusb
Bus 001 Device 008: ID 0403:6001 Future Technology Devices International, Ltd FT232 Serial (UART) IC

Requirements

• libftdi1
• libftdi1-dev

Debian

apt install libftdi1 libftdi1-dev

Alpine Linux

apk add libftdi1 libftdi1-dev

Installation

make install

Installs lobgpio_ftdi.a and libgpio_ftdi.so in the directory $(PREFIX)/lib/. It also installs the include header files ftdi_dev.h and gpio.h in the directory $(PREFIX)/include/gpio_ftdi. The default value for PREFIX is: PREFIX=usr. To use another location for installation changing the value of the PREFIX variable is needed. E.g.:

PREFIX=/usr/local/ make install

Uninstallation

make install

Removes the files installed with the install make target.

NOTE: When PREFIX variable was changed during installation process the same value needs to be set for uninstallation. E.g.:

PREFIX=/usr/local/ make install

Example

    #include <stdio.h>
    #include <stdlib.h>
    #include <unistd.h>
    #include <syslog.h>
    #include <stdbool.h>
    #include <ftdi_dev.h>
    #include <gpio.h>

    static struct ftdi_dev ftdi_obj = {
        .ftdi = NULL,
        .is_open = false,
        .vendor_id = 0x0403,
        .product_id = 0x6001,
        .bit_mask = 0,
        .status_mask = 0,
    };

    static const struct gpio gpio_1 = {
        .pin = 0x08, /* CTS (brown wire on FTDI cable) */
        .ftdi_dev = &ftdi_obj,
    };

    int main(void)
    {
        int res, cnt;
        unsigned int value;

        openlog("ftdi_gpio", LOG_CONS | LOG_PID | LOG_NDELAY, LOG_LOCAL1);

        res = gpio_open(&gpio_1);
        if(res != EXIT_SUCCESS) {
            syslog(LOG_ERR, "Unable to open gpio\n");
            return res;
        }

        gpio_write(&gpio_1, 1);
        for(cnt = 0; cnt < 10; cnt++) {
            gpio_toggle(&gpio_1);
            gpio_read(&gpio_1, &value);
            printf("Gpio1: %u\n", value);
            sleep(1);
        }
        gpio_close(&gpio_1);

        return EXIT_SUCCESS;
    }

Additional make targets

Target	Meaning
all	Build the code, assemble the static and shared library.
install	Install the libraries and necessary include header files.
uninstall	Uninstall the libraries and necessary include header files.
clean	Clean up build artifacts.
build_unit_test	Build the unit tests.
exec_unit_test	Execute the unit tests.
coverage	Determine code coverage of the unit tests.
check	Static code analysis (cppcheck).