drivers: fixes to the low-level GPIO driver
- fixed doxygen comments - added GPIO_UNDEFINED value - added return values to all functions
This commit is contained in:
Hauke Petersen
parent
3ede45eb2b
commit
7b96e488ff
@ -25,92 +25,99 @@
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/**
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* @brief Definition of available GPIO devices. Each device is managing exactly one pin.
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*/
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#ifdef GPIO_NUMOF
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typedef enum {
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#ifdef GPIO_0_EN
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GPIO_0 = 0, ///< GPIO device 0
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GPIO_0 = 0, /**< GPIO device 0 */
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#endif
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#ifdef GPIO_1_EN
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GPIO_1, ///< GPIO device 1
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GPIO_1, /**< GPIO device 1 */
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#endif
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#ifdef GPIO_2_EN
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GPIO_2, ///< GPIO device 2
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GPIO_2, /**< GPIO device 2 */
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#endif
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#ifdef GPIO_3_EN
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GPIO_3, ///< GPIO device 3
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GPIO_3, /**< GPIO device 3 */
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#endif
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#ifdef GPIO_4_EN
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GPIO_4, ///< GPIO device 4
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GPIO_4, /**< GPIO device 4 */
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#endif
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#ifdef GPIO_5_EN
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GPIO_5, ///< GPIO device 5
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GPIO_5, /**< GPIO device 5 */
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#endif
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#ifdef GPIO_6_EN
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GPIO_6, ///< GPIO device 6
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GPIO_6, /**< GPIO device 6 */
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#endif
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#ifdef GPIO_7_EN
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GPIO_7, ///< GPIO device 7
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GPIO_7, /**< GPIO device 7 */
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#endif
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#ifdef GPIO_8_EN
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GPIO_8, ///< GPIO device 8
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GPIO_8, /**< GPIO device 8 */
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#endif
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#ifdef GPIO_9_EN
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GPIO_9, ///< GPIO device 9
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GPIO_9, /**< GPIO device 9 */
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#endif
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#ifdef GPIO_10_EN
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GPIO_10, ///< GPIO device 10
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GPIO_10, /**< GPIO device 10 */
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#endif
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#ifdef GPIO_11_EN
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GPIO_11, ///< GPIO device 11
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GPIO_11, /**< GPIO device 11 */
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#endif
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#ifdef GPIO_12_EN
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GPIO_12, ///< GPIO device 12
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GPIO_12, /**< GPIO device 12 */
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#endif
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#ifdef GPIO_13_EN
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GPIO_13, ///< GPIO device 13
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GPIO_13, /**< GPIO device 13 */
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#endif
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#ifdef GPIO_14_EN
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GPIO_14, ///< GPIO device 14
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GPIO_14, /**< GPIO device 14 */
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#endif
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#ifdef GPIO_15_EN
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GPIO_15 ///< GPIO device 15
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GPIO_15, /**< GPIO device 15 */
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#endif
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GPIO_UNDEFINED = -1 /**< fall-back device */
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} gpio_t;
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#endif
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/**
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* @brief Definition of pull-up/pull-down modes
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*/
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typedef enum {
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GPIO_PULLDOWN, ///< enable internal pull-down resistor
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GPIO_PULLUP, ///< enable internal pull-up resistor
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GPIO_NOPULL ///< do not use internal pull resistors
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GPIO_NOPULL = 0, /**< do not use internal pull resistors */
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GPIO_PULLUP = 1, /**< enable internal pull-up resistor */
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GPIO_PULLDOWN = 2 /**< enable internal pull-down resistor */
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} gpio_pp_t;
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/**
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* @brief Definition of possible active flanks for external interrupt mode
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*/
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typedef enum {
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GPIO_FALLING, ///< emit interrupt on falling flank
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GPIO_RISING, ///< emit interrupt on rising flank
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GPIO_BOTH ///< emit interrupt on both flanks
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GPIO_FALLING = 0, /**< emit interrupt on falling flank */
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GPIO_RISING = 1, /**< emit interrupt on rising flank */
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GPIO_BOTH = 2 /**< emit interrupt on both flanks */
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} gpio_flank_t;
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/**
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* @brief Initialize GPIO pin as output pin
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*
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* @param dev the GPIO pin to set as output
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* @param pullup define if pull resistors should be used
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* @param[in] dev the GPIO pin to set as output
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* @param[in] pullup define if pull resistors should be used
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*
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* @return 0 on success
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* @return -1 on undefined device given
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* @return -2 on pull-up mode unavailable
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*/
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void gpio_init_out(gpio_t dev, gpio_pp_t pullup);
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int gpio_init_out(gpio_t dev, gpio_pp_t pullup);
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/**
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* @brief Initialize a GPIO pin in input mode
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*
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* @param dev the GPIO pin to use as input
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* @param pullup define if pull resistors should be used
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* @param[in] dev the GPIO pin to use as input
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* @param[in] pullup define if pull resistors should be used
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*
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* @return 0 on success
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* @return -1 on undefined device given
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* @return -2 on pull-up mode unavailable
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*/
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void gpio_init_in(gpio_t dev, gpio_pp_t pullup);
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int gpio_init_in(gpio_t dev, gpio_pp_t pullup);
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/**
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* @brief Initialize a GPIO pin for external interrupt usage
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@ -120,49 +127,70 @@ void gpio_init_in(gpio_t dev, gpio_pp_t pullup);
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*
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* The interrupt is activated automatically after the initialization.
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*
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* @param dev the GPIO pin to initialize
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* @param pullup define if pull resistors should be enabled
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* @param flank define the active flank(s)
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* @param cb register the callback that is called in interrupt context
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* @param[in] dev the GPIO pin to initialize
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* @param[in] pullup define if pull resistors should be enabled
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* @param[in] flank define the active flank(s)
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* @param[in] cb register the callback that is called in interrupt context
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*
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* @return 0 on success
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* @return -1 on undefined device given
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* @return -2 on pull-up mode unavailable
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* @return -3 on active flank unavailable
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*/
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void gpio_init_int(gpio_t dev, gpio_pp_t pullup, gpio_flank_t flank, void (*cb)(void));
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int gpio_init_int(gpio_t dev, gpio_pp_t pullup, gpio_flank_t flank, void (*cb)(void));
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/**
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* @brief Get the current value of the given GPIO pin
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*
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* @param dev the GPIO pin to read
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* @param[in] dev the GPIO pin to read
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* @return the current value, 0 for LOW, != 0 for HIGH
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*
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* @return 0 when pin is LOW
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* @return greater 0 for HIGH
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* @return -1 on undefined device given
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*/
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int gpio_read(gpio_t dev);
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/**
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* @brief Set the given GPIO pin to HIGH
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*
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* @param dev the GPIO pin to set
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* @param[in] dev the GPIO pin to set
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*
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* @return 0 on success
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* @return -1 on undefined device given
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*/
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void gpio_set(gpio_t dev);
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int gpio_set(gpio_t dev);
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/**
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* @brief Set the given GPIO pin to LOW
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*
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* @param dev the GPIO pin to clear
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* @param[in] dev the GPIO pin to clear
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*
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* @return 0 on success
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* @return -1 on undefined device given
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*/
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void gpio_clear(gpio_t dev);
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int gpio_clear(gpio_t dev);
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/**
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* @brief Toggle the value of the given GPIO pin
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*
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* @param dev the GPIO pin to toggle
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* @param[in] dev the GPIO pin to toggle
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*
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* @return 0 on success
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* @return -1 on undefined device given
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*/
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void gpio_toggle(gpio_t dev);
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int gpio_toggle(gpio_t dev);
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/**
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* @brief Set the given GPIO pin to the given value
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*
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* @param dev the GPIO pin to set
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* @param value value to set the pin to, 0 for LOW, HIGH otherwise
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* @param[in] dev the GPIO pin to set
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* @param[in] value value to set the pin to, 0 for LOW, HIGH otherwise
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*
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* @return 0 on success
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* @return -1 on undefined device given
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*/
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void gpio_write(gpio_t dev, int value);
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int gpio_write(gpio_t dev, int value);
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#endif /* __GPIO_H */
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/** @} */
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