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https://github.com/RIOT-OS/RIOT.git
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254 lines
6.8 KiB
C
254 lines
6.8 KiB
C
/*
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* Copyright (C) 2014-2015 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 boards_samr21-xpro
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* @{
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*
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* @file
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* @brief Configuration of CPU peripherals for the Atmel SAM R21 Xplained
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* Pro board
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*
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* @author Thomas Eichinger <thomas.eichinger@fu-berlin.de>
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* @author Hauke Petersen <hauke.petersen@fu-berlin.de>
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* @author Peter Kietzmann <peter.kietzmann@haw-hamburg.de>
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*/
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#ifndef PERIPH_CONF_H_
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#define PERIPH_CONF_H_
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#include <stdint.h>
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#include "cpu.h"
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#include "periph_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 External oscillator and clock configuration
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*
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* For selection of the used CORECLOCK, we have implemented two choices:
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*
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* - usage of the PLL fed by the internal 8MHz oscillator divided by 8
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* - usage of the internal 8MHz oscillator directly, divided by N if needed
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*
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*
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* The PLL option allows for the usage of a wider frequency range and a more
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* stable clock with less jitter. This is why we use this option as default.
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*
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* The target frequency is computed from the PLL multiplier and the PLL divisor.
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* Use the following formula to compute your values:
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*
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* CORECLOCK = ((PLL_MUL + 1) * 1MHz) / PLL_DIV
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*
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* NOTE: The PLL circuit does not run with less than 32MHz while the maximum PLL
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* frequency is 96MHz. So PLL_MULL must be between 31 and 95!
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*
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*
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* The internal Oscillator used directly can lead to a slightly better power
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* efficiency to the cost of a less stable clock. Use this option when you know
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* what you are doing! The actual core frequency is adjusted as follows:
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*
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* CORECLOCK = 8MHz / DIV
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*
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* NOTE: A core clock frequency below 1MHz is not recommended
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*
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* @{
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*/
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#define CLOCK_USE_PLL (1)
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#if CLOCK_USE_PLL
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/* edit these values to adjust the PLL output frequency */
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#define CLOCK_PLL_MUL (47U) /* must be >= 31 & <= 95 */
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#define CLOCK_PLL_DIV (1U) /* adjust to your needs */
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/* generate the actual used core clock frequency */
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#define CLOCK_CORECLOCK (((CLOCK_PLL_MUL + 1) * 1000000U) / CLOCK_PLL_DIV)
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#else
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/* edit this value to your needs */
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#define CLOCK_DIV (1U)
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/* generate the actual core clock frequency */
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#define CLOCK_CORECLOCK (8000000 / CLOCK_DIV)
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#endif
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/** @} */
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/**
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* @name Timer peripheral configuration
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* @{
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*/
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#define TIMER_NUMOF (2U)
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#define TIMER_0_EN 1
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#define TIMER_1_EN 1
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/* Timer 0 configuration */
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#define TIMER_0_DEV TC3->COUNT16
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#define TIMER_0_CHANNELS 2
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#define TIMER_0_MAX_VALUE (0xffff)
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#define TIMER_0_ISR isr_tc3
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/* Timer 1 configuration */
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#define TIMER_1_DEV TC4->COUNT32
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#define TIMER_1_CHANNELS 2
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#define TIMER_1_MAX_VALUE (0xffffffff)
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#define TIMER_1_ISR isr_tc4
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/** @} */
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/**
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* @name UART configuration
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* @{
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*/
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static const uart_conf_t uart_config[] = {
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{
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.dev = &SERCOM0->USART,
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.rx_pin = GPIO_PIN(PA,5),
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.tx_pin = GPIO_PIN(PA,4),
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.mux = GPIO_MUX_D,
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.rx_pad = UART_PAD_RX_1,
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.tx_pad = UART_PAD_TX_0
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},
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{
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.dev = &SERCOM5->USART,
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.rx_pin = GPIO_PIN(PA,23),
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.tx_pin = GPIO_PIN(PA,22),
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.mux = GPIO_MUX_D,
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.rx_pad = UART_PAD_RX_1,
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.tx_pad = UART_PAD_TX_0
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}
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};
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/* interrupt function name mapping */
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#define UART_0_ISR isr_sercom0
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#define UART_1_ISR isr_sercom5
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#define UART_NUMOF (sizeof(uart_config) / sizeof(uart_config[0]))
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/** @} */
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/**
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* @name PWM configuration
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* @{
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*/
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#define PWM_0_EN 1
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#define PWM_1_EN 1
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#define PWM_MAX_CHANNELS 3
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/* for compatibility with test application */
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#define PWM_0_CHANNELS PWM_MAX_CHANNELS
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#define PWM_1_CHANNELS PWM_MAX_CHANNELS
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/* PWM device configuration */
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static const pwm_conf_t pwm_config[] = {
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#if PWM_0_EN
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{TCC1, {
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/* GPIO pin, MUX value, TCC channel */
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{ GPIO_PIN(PA, 6), GPIO_MUX_E, 0 },
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{ GPIO_PIN(PA, 7), GPIO_MUX_E, 1 },
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{ GPIO_UNDEF, (gpio_mux_t)0, 2 }
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}},
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#endif
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#if PWM_1_EN
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{TCC0, {
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/* GPIO pin, MUX value, TCC channel */
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{ GPIO_PIN(PA, 16), GPIO_MUX_F, 0 },
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{ GPIO_PIN(PA, 18), GPIO_MUX_F, 2 },
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{ GPIO_PIN(PA, 19), GPIO_MUX_F, 3 }
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}}
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#endif
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};
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/* number of devices that are actually defined */
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#define PWM_NUMOF (2U)
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/** @} */
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/**
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* @name SPI configuration
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* @{
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*/
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#define SPI_NUMOF (2)
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#define SPI_0_EN 1
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#define SPI_1_EN 1
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/* SPI0 */
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#define SPI_0_DEV SERCOM4->SPI
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#define SPI_IRQ_0 SERCOM4_IRQn
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#define SPI_0_GCLK_ID SERCOM4_GCLK_ID_CORE
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/* SPI 0 pin configuration */
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#define SPI_0_SCLK GPIO_PIN(PC, 18)
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#define SPI_0_SCLK_MUX GPIO_MUX_F
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#define SPI_0_MISO GPIO_PIN(PC, 19)
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#define SPI_0_MISO_MUX GPIO_MUX_F
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#define SPI_0_MISO_PAD SPI_PAD_MISO_0
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#define SPI_0_MOSI GPIO_PIN(PB, 30)
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#define SPI_0_MOSI_MUX GPIO_MUX_F
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#define SPI_0_MOSI_PAD SPI_PAD_MOSI_2_SCK_3
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/* SPI1 */
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#define SPI_1_DEV SERCOM5->SPI
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#define SPI_IRQ_1 SERCOM5_IRQn
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#define SPI_1_GCLK_ID SERCOM5_GCLK_ID_CORE
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/* SPI 1 pin configuration */
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#define SPI_1_SCLK GPIO_PIN(PB, 23)
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#define SPI_1_SCLK_MUX GPIO_MUX_D
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#define SPI_1_MISO GPIO_PIN(PB, 02)
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#define SPI_1_MISO_MUX GPIO_MUX_D
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#define SPI_1_MISO_PAD SPI_PAD_MISO_0
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#define SPI_1_MOSI GPIO_PIN(PB, 22)
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#define SPI_1_MOSI_MUX GPIO_MUX_D
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#define SPI_1_MOSI_PAD SPI_PAD_MOSI_2_SCK_3
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/** @} */
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/**
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* @name I2C configuration
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* @{
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*/
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#define I2C_NUMOF (1U)
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#define I2C_0_EN 1
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#define I2C_1_EN 0
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#define I2C_2_EN 0
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#define I2C_3_EN 0
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#define I2C_IRQ_PRIO 1
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#define I2C_0_DEV SERCOM3->I2CM
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#define I2C_0_IRQ SERCOM3_IRQn
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#define I2C_0_ISR isr_sercom3
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/* I2C 0 GCLK */
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#define I2C_0_GCLK_ID SERCOM3_GCLK_ID_CORE
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#define I2C_0_GCLK_ID_SLOW SERCOM3_GCLK_ID_SLOW
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/* I2C 0 pin configuration */
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#define I2C_0_SDA GPIO_PIN(PA, 16)
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#define I2C_0_SCL GPIO_PIN(PA, 17)
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#define I2C_0_MUX GPIO_MUX_D
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/**
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* @name RTC configuration
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* @{
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*/
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#define RTC_NUMOF (1U)
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#define RTC_DEV RTC->MODE2
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/** @} */
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/**
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* @name RTT configuration
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* @{
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*/
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#define RTT_NUMOF (1U)
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#define RTT_DEV RTC->MODE0
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#define RTT_IRQ RTC_IRQn
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#define RTT_IRQ_PRIO 10
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#define RTT_ISR isr_rtc
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#define RTT_MAX_VALUE (0xffffffff)
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#define RTT_FREQUENCY (32768U) /* in Hz. For changes see `rtt.c` */
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#define RTT_RUNSTDBY (1) /* Keep RTT running in sleep states */
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/** @} */
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#ifdef __cplusplus
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}
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#endif
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#endif /* PERIPH_CONF_H_ */
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/** @} */
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