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https://github.com/RIOT-OS/RIOT.git
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940097336a
- moved definition of CPUID_LEN to periph_cpu.h - fixed some doxygen - simplyfied some implementations
149 lines
3.6 KiB
C
149 lines
3.6 KiB
C
/*
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* Copyright (C) 2015 Freie Universität Berlin
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*
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* This file is subject to the terms and conditions of the GNU Lesser
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* General Public License v2.1. See the file LICENSE in the top level
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* directory for more details.
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*/
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/**
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* @ingroup cpu_samd21
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* @{
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*
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* @file
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* @brief CPU specific definitions for internal peripheral handling
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*
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* @author Hauke Petersen <hauke.peterse@fu-berlin.de>
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*/
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#ifndef CPU_PERIPH_H_
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#define CPU_PERIPH_H_
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#include "cpu.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* @brief Define a custom type for GPIO pins
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* @{
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*/
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#define HAVE_GPIO_T
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typedef uint32_t gpio_t;
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/** @} */
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/**
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* @brief Definition of a fitting UNDEF value
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*/
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#define GPIO_UNDEF (0xffffffff)
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/**
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* @brief Mandatory function for defining a GPIO pins
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* @{
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*/
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#define GPIO_PIN(x, y) (((gpio_t)(&PORT->Group[x])) | y)
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/**
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* @brief Length of the CPU_ID in octets
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*/
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#define CPUID_LEN (16U)
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/**
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* @brief Available ports on the SAMD21
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*/
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enum {
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PA = 0, /**< port A */
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PB = 1, /**< port B */
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PC = 2, /**< port C */
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};
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/**
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* @brief Override active flank configuration values
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* @{
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*/
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#define HAVE_GPIO_FLANK_T
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typedef enum {
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GPIO_FALLING = 2, /**< emit interrupt on falling flank */
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GPIO_RISING = 1, /**< emit interrupt on rising flank */
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GPIO_BOTH = 3 /**< emit interrupt on both flanks */
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} gpio_flank_t;
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/** @} */
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/**
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* @brief Available MUX values for configuring a pin's alternate function
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*/
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typedef enum {
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GPIO_MUX_A = 0x0, /**< select peripheral function A */
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GPIO_MUX_B = 0x1, /**< select peripheral function B */
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GPIO_MUX_C = 0x2, /**< select peripheral function C */
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GPIO_MUX_D = 0x3, /**< select peripheral function D */
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GPIO_MUX_E = 0x4, /**< select peripheral function E */
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GPIO_MUX_F = 0x5, /**< select peripheral function F */
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GPIO_MUX_G = 0x6, /**< select peripheral function G */
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GPIO_MUX_H = 0x7, /**< select peripheral function H */
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} gpio_mux_t;
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/**
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* @brief PWM channel configuration data structure
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*/
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typedef struct {
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gpio_t pin; /**< GPIO pin */
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gpio_mux_t mux; /**< pin function multiplex value */
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uint8_t chan; /**< TCC channel to use */
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} pwm_conf_chan_t;
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/**
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* @brief PWM device configuration data structure
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*/
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typedef struct {
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Tcc *dev; /**< TCC device to use */
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pwm_conf_chan_t chan[2]; /**< channel configuration */
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} pwm_conf_t;
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/**
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* @brief UART device configuration
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*/
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typedef struct {
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SercomUsart *dev; /**< pointer to the used UART device */
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gpio_t rx_pin; /**< pin used for RX */
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gpio_t tx_pin; /**< pin used for TX */
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gpio_mux_t mux; /**< alternative function for pins */
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} uart_conf_t;
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/**
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* @brief Return the numeric id of a SERCOM device derived from its address
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*
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* @param[in] sercom SERCOM device
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*
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* @return numeric id of the given SERCOM device
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*/
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static inline int _sercom_id(SercomUsart *sercom)
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{
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return ((((uint32_t)sercom) >> 10) & 0x7) - 2;
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}
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/**
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* @brief Set up alternate function (PMUX setting) for a PORT pin
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*
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* @param[in] dev Pin to set the multiplexing for
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* @param[in] mux Mux value
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*/
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int gpio_init_mux(gpio_t dev, gpio_mux_t mux);
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/**
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* @brief declare needed generic SPI functions
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* @{
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*/
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#define PERIPH_SPI_NEEDS_TRANSFER_BYTES
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#define PERIPH_SPI_NEEDS_TRANSFER_REG
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#define PERIPH_SPI_NEEDS_TRANSFER_REGS
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/** @} */
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#ifdef __cplusplus
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}
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#endif
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#endif /* CPU_PERIPH_H_ */
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/** @} */
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