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This version (27 Sep 2022 16:29) was approved by Darius B.The Previously approved version (27 Sep 2022 10:38) is available.Diff

Table of Contents

No-OS GPIO API

Description

The GPIO framework provides a way to handle General-Purpose Input/Output (GPIO) pins when using the No-OS platform drivers.

Interface Documentation

The GPIO interface documentation is generated using the Doxygen tool and it is available at:

Initialization example

GPIO initialization

/* GPIO Description declaration */
struct no_os_gpio_desc *gpio_desc;
 
/* GPIO Initialization Parameters */
struct no_os_gpio_init_param gpio_param = {
	/** Port number */
	.port = 0,
	/** Pull up/down resistor configuration */
	.pull = NO_OS_PULL_NONE,
	/** GPIO Number */
	.number = GPIO_1,
	/** GPIO platform specific functions (Xilinx Platform in this particular example) */
	.platform_ops = &xil_gpio_ops,
	/** GPIO extra parameters (device specific) */
	.extra = &xil_gpio_param
};
 
/* Obtain the GPIO decriptor. */
ret = no_os_gpio_get(&gpio_desc, &gpio_param);
if (ret)
	return -1;
 
/* Free the resources allocated by no_os_gpio_get(). */
ret = no_os_gpio_remove(gpio_desc);
if (ret)
	return -1;

Alternatively, if the a specific gpio is optional, the `no_os_gpio_get_optional` function can be used instead of `no_os_gpio_get`.

GPIO Usage

/* Enable the input direction of the specified GPIO. */
ret = no_os_gpio_direction_input(gpio_desc);
if (ret)
	return -1;
 
/* Enable the output direction of the specified GPIO with logic level high. */
ret = no_os_gpio_direction_output(gpio_desc, NO_OS_GPIO_HIGH);
if (ret)
	return -1;
 
/* Enable the output direction of the specified GPIO with logic level low. */
ret = no_os_gpio_direction_output(gpio_desc, NO_OS_GPIO_LOW);
if (ret)
	return -1;
 
/* Get the direction of the specified GPIO. */
uint8_t dir;
ret = no_os_gpio_get_direction(gpio_desc, &dir);
if (ret)
	return -1;
 
/* Set the value of the specified GPIO with logic level high. */
ret = no_os_gpio_set_value(gpio_desc, NO_OS_GPIO_HIGH);
if (ret)
	return -1;
 
/* Set the value of the specified GPIO with logic level low. */
ret = no_os_gpio_set_value(gpio_desc, NO_OS_GPIO_LOW);
if (ret)
	return -1;
 
/* Get the value of the specified GPIO. */
enum no_os_gpio_values val;
ret = no_os_gpio_get_value(gpio_desc, &val);
if (ret)
	return -1;
resources/no-os/drivers/gpio.txt · Last modified: 27 Sep 2022 16:29 by Darius B

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