periph_conf.h

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/*
 * Copyright (C) 2020 ML!PA Consulting GmbH
 *
 * This file is subject to the terms and conditions of the GNU Lesser
 * General Public License v2.1. See the file LICENSE in the top level
 * directory for more details.
 */
 
#pragma once
 
#include <stdint.h>
 
#include "cpu.h"
#include "periph_cpu.h"
 
#ifdef __cplusplus
extern "C" {
#endif
 
#define CLOCK_USE_PLL               (0)
#define CLOCK_USE_XOSC32_DFLL       (1)
/*
 * 0: use XOSC32K (always 32.768kHz) to clock GCLK2
 * 1: use OSCULP32K factory calibrated (~32.768kHz) to clock GCLK2
 *
 * OSCULP32K is factory calibrated to be around 32.768kHz but this values can
 * be of by a couple off % points, so prefer XOSC32K as default configuration.
 */
#define GEN2_ULP32K                 (0)
 
#if CLOCK_USE_PLL
/* edit these values to adjust the PLL output frequency */
#define CLOCK_PLL_MUL       (47U)               /* must be >= 31 & <= 95 */
#define CLOCK_PLL_DIV       (1U)                /* adjust to your needs */
/* generate the actual used core clock frequency */
#define CLOCK_CORECLOCK     (((CLOCK_PLL_MUL + 1) * 1000000U) / CLOCK_PLL_DIV)
#elif CLOCK_USE_XOSC32_DFLL
/* Settings for 32 kHz external oscillator and 48 MHz DFLL */
#define CLOCK_CORECLOCK     (48000000U)
#define CLOCK_XOSC32K       (32768UL)
#define CLOCK_8MHZ          (1)
#else
/* edit this value to your needs */
#define CLOCK_DIV           (1U)
/* generate the actual core clock frequency */
#define CLOCK_CORECLOCK     (8000000 / CLOCK_DIV)
#endif
static const tc32_conf_t timer_config[] = {
    {   /* Timer 0 - System Clock */
        .dev            = TC0,
        .irq            = TC0_IRQn,
        .pm_mask        = PM_APBCMASK_TC0 | PM_APBCMASK_TC1,
        .gclk_ctrl      = GCLK_CLKCTRL_ID_TC0_TC1,
#if CLOCK_USE_PLL || CLOCK_USE_XOSC32_DFLL
        .gclk_src       = SAM0_GCLK_1MHZ,
#else
        .gclk_src       = SAM0_GCLK_MAIN,
#endif
        .flags          = TC_CTRLA_MODE_COUNT32,
    },
    {   /* Timer 1 */
        .dev            = TC4,
        .irq            = TC4_IRQn,
        .pm_mask        = PM_APBCMASK_TC4 | PM_APBCMASK_TC5,
        .gclk_ctrl      = GCLK_CLKCTRL_ID_TC4_TC5,
#if CLOCK_USE_PLL || CLOCK_USE_XOSC32_DFLL
        .gclk_src       = SAM0_GCLK_1MHZ,
#else
        .gclk_src       = SAM0_GCLK_MAIN,
#endif
        .flags          = TC_CTRLA_MODE_COUNT32,
    }
};
 
/* interrupt function name mapping */
#define TIMER_0_ISR         isr_tc0
#define TIMER_1_ISR         isr_tc4
 
#define TIMER_NUMOF         ARRAY_SIZE(timer_config)
static const uart_conf_t uart_config[] = {
    {    /* Virtual COM Port */
        .dev      = &SERCOM3->USART,
        .rx_pin   = GPIO_PIN(PA,25),
        .tx_pin   = GPIO_PIN(PA,24),
#ifdef MODULE_PERIPH_UART_HW_FC
        .rts_pin  = GPIO_UNDEF,
        .cts_pin  = GPIO_UNDEF,
#endif
        .mux      = GPIO_MUX_C,
        .rx_pad   = UART_PAD_RX_3,
        .tx_pad   = UART_PAD_TX_2,
        .flags    = UART_FLAG_NONE,
        .gclk_src = SAM0_GCLK_MAIN,
    },
    {    /* EXT1 */
        .dev      = &SERCOM4->USART,
        .rx_pin   = GPIO_PIN(PB,9),
        .tx_pin   = GPIO_PIN(PB,8),
#ifdef MODULE_PERIPH_UART_HW_FC
        .rts_pin  = GPIO_UNDEF,
        .cts_pin  = GPIO_UNDEF,
#endif
        .mux      = GPIO_MUX_D,
        .rx_pad   = UART_PAD_RX_1,
        .tx_pad   = UART_PAD_TX_0,
        .flags    = UART_FLAG_NONE,
        .gclk_src = SAM0_GCLK_MAIN,
    },
    {    /* EXT2 */
        .dev      = &SERCOM0->USART,
        .rx_pin   = GPIO_PIN(PA,9),
        .tx_pin   = GPIO_PIN(PA,8),
#ifdef MODULE_PERIPH_UART_HW_FC
        .rts_pin  = GPIO_UNDEF,
        .cts_pin  = GPIO_UNDEF,
#endif
        .mux      = GPIO_MUX_C,
        .rx_pad   = UART_PAD_RX_1,
        .tx_pad   = UART_PAD_TX_0,
        .flags    = UART_FLAG_NONE,
        .gclk_src = SAM0_GCLK_MAIN,
    },
};
 
/* interrupt function name mapping */
#define UART_0_ISR          isr_sercom3
#define UART_1_ISR          isr_sercom4
#define UART_2_ISR          isr_sercom0
 
#define UART_NUMOF          ARRAY_SIZE(uart_config)
static const spi_conf_t spi_config[] = {
    {   /* EXT1 */
        .dev      = &SERCOM0->SPI,
        .miso_pin = GPIO_PIN(PA, 4),
        .mosi_pin = GPIO_PIN(PA, 6),
        .clk_pin  = GPIO_PIN(PA, 7),
        .miso_mux = GPIO_MUX_D,
        .mosi_mux = GPIO_MUX_D,
        .clk_mux  = GPIO_MUX_D,
        .miso_pad = SPI_PAD_MISO_0,
        .mosi_pad = SPI_PAD_MOSI_2_SCK_3,
        .gclk_src = SAM0_GCLK_MAIN,
    },
    {   /* EXT2 */
        .dev      = &SERCOM1->SPI,
        .miso_pin = GPIO_PIN(PA, 16),
        .mosi_pin = GPIO_PIN(PA, 18),
        .clk_pin  = GPIO_PIN(PA, 19),
        .miso_mux = GPIO_MUX_C,
        .mosi_mux = GPIO_MUX_C,
        .clk_mux  = GPIO_MUX_C,
        .miso_pad = SPI_PAD_MISO_0,
        .mosi_pad = SPI_PAD_MOSI_2_SCK_3,
        .gclk_src = SAM0_GCLK_MAIN,
    },
    {   /* EXT3 */
        .dev      = &SERCOM5->SPI,
        .miso_pin = GPIO_PIN(PB, 16),
        .mosi_pin = GPIO_PIN(PB, 22),
        .clk_pin  = GPIO_PIN(PB, 23),
        .miso_mux = GPIO_MUX_C,
        .mosi_mux = GPIO_MUX_D,
        .clk_mux  = GPIO_MUX_D,
        .miso_pad = SPI_PAD_MISO_0,
        .mosi_pad = SPI_PAD_MOSI_2_SCK_3,
        .gclk_src = SAM0_GCLK_MAIN,
    },
};
 
#define SPI_NUMOF           ARRAY_SIZE(spi_config)
static const i2c_conf_t i2c_config[] = {
    {
        .dev      = &(SERCOM2->I2CM),
        .speed    = I2C_SPEED_NORMAL,
        .scl_pin  = GPIO_PIN(PA, 9),
        .sda_pin  = GPIO_PIN(PA, 8),
        .mux      = GPIO_MUX_D,
        .gclk_src = SAM0_GCLK_MAIN,
        .flags    = I2C_FLAG_NONE
     }
};
#define I2C_NUMOF          ARRAY_SIZE(i2c_config)
#ifndef RTT_FREQUENCY
#define RTT_FREQUENCY       (32768U)    /* in Hz. For changes see `rtt.c` */
#endif
#define PWM_0_EN            1
 
#if PWM_0_EN
/* PWM0 channels */
static const pwm_conf_chan_t pwm_chan0_config[] = {
    /* GPIO pin, MUX value, TCC channel */
    { GPIO_PIN(PA, 14), GPIO_MUX_E, 0 },
};
#endif
 
/* PWM device configuration */
static const pwm_conf_t pwm_config[] = {
#if PWM_0_EN
    { .tim  = TC_CONFIG(TC3),
      .chan = pwm_chan0_config,
      .chan_numof = ARRAY_SIZE(pwm_chan0_config),
      .gclk_src = SAM0_GCLK_1MHZ,
    },
#endif
};
 
/* number of devices that are actually defined */
#define PWM_NUMOF           ARRAY_SIZE(pwm_config)
/* ADC Default values */
#define ADC_PRESCALER                       ADC_CTRLB_PRESCALER_DIV128
 
#define ADC_NEG_INPUT                       ADC_INPUTCTRL_MUXNEG_GND
#define ADC_GAIN_FACTOR_DEFAULT             ADC_INPUTCTRL_GAIN_1X
#define ADC_REF_DEFAULT                     ADC_REFCTRL_REFSEL_INT1V
 
static const adc_conf_chan_t adc_channels[] = {
    /* port, pin, muxpos */
    { .inputctrl = ADC_INPUTCTRL_MUXPOS_PB00 },      /* EXT1, pin 3 */
    { .inputctrl = ADC_INPUTCTRL_MUXPOS_PB01 },      /* EXT1, pin 4 */
    { .inputctrl = ADC_INPUTCTRL_MUXPOS_PA10 },    /* EXT2, pin 3 */
    { .inputctrl = ADC_INPUTCTRL_MUXPOS_PA11 },    /* EXT2, pin 4 */
    { .inputctrl = ADC_INPUTCTRL_MUXPOS_PA02 },      /* EXT3, pin 3 */
    { .inputctrl = ADC_INPUTCTRL_MUXPOS_PA03 }       /* EXT3, pin 4.*/
};
 
#define ADC_NUMOF                           ARRAY_SIZE(adc_channels)
#define DAC_CLOCK           SAM0_GCLK_1MHZ
                            /* use Vcc as reference voltage */
#define DAC_VREF            DAC_CTRLB_REFSEL_AVCC
#ifdef __cplusplus
}
#endif