periph_conf.h

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/*
 * SPDX-FileCopyrightText: 2024 ML!PA Consulting GmbH
 * SPDX-License-Identifier: LGPL-2.1-only
 */
 
#pragma once

 
#include "periph_cpu.h"
 
#ifdef __cplusplus
extern "C" {
#endif

#ifndef CLOCK_CORECLOCK
#define CLOCK_CORECLOCK     MHZ(120)
#endif

#define EXTERNAL_OSC32_SOURCE                   1
#define INTERNAL_OSC32_SOURCE                   0
#define ULTRA_LOW_POWER_INTERNAL_OSC_SOURCE     0

#define USE_VREG_BUCK       (1)

#define ADC_GCLK_SRC                        SAM0_GCLK_PERIPH    
#define ADC_PRESCALER                       ADC_CTRLA_PRESCALER_DIV8
#define ADC_NEG_INPUT                       ADC_INPUTCTRL_MUXNEG(0x18u)
#define ADC_REF_DEFAULT                     ADC_REFCTRL_REFSEL_INTVCC1
 
static const adc_conf_chan_t adc_channels[] = {
    /* port, pin, muxpos, dev */
    { .inputctrl = ADC0_INPUTCTRL_MUXPOS_PA02, .dev = ADC0 }, /* A0 */
    { .inputctrl = ADC0_INPUTCTRL_MUXPOS_PA05, .dev = ADC0 }, /* A1 */
    { .inputctrl = ADC0_INPUTCTRL_MUXPOS_PA06, .dev = ADC0 }, /* A2 */
    { .inputctrl = ADC0_INPUTCTRL_MUXPOS_PA04, .dev = ADC0 }, /* A3 */
    { .inputctrl = ADC1_INPUTCTRL_MUXPOS_PB08, .dev = ADC1 }, /* A4 */
    { .inputctrl = ADC1_INPUTCTRL_MUXPOS_PB09, .dev = ADC1 }, /* A5 */
};
 
#define ADC_NUMOF                           ARRAY_SIZE(adc_channels)

                            /* Must not exceed 12 MHz */
#define DAC_CLOCK           SAM0_GCLK_TIMER
                            /* Use external reference voltage on PA03 */
                            /* (A solder jumper connects PA03 to 3V3 on the
                             * back of the board. We assume the jumper has
                             * not been cut.) */
#define DAC_VREF            DAC_CTRLB_REFSEL_VREFPU

static const i2c_conf_t i2c_config[] = {
    {
        .dev      = &(SERCOM5->I2CM),
        .speed    = I2C_SPEED_NORMAL,
        .scl_pin  = GPIO_PIN(PB, 3),   /* D: SERCOM5.1 */
        .sda_pin  = GPIO_PIN(PB, 2),   /* D: SERCOM5.0 */
        .mux      = GPIO_MUX_D,
        .gclk_src = SAM0_GCLK_PERIPH,
        .flags    = I2C_FLAG_NONE
    },
};
 
#define I2C_NUMOF           ARRAY_SIZE(i2c_config)

#ifndef RTT_FREQUENCY
#define RTT_FREQUENCY       (32768U)
#endif

static const tc32_conf_t timer_config[] = {
    {   /* Timer 0 - System Clock */
        .dev            = TC0,
        .irq            = TC0_IRQn,
        .mclk           = &MCLK->APBAMASK.reg,
        .mclk_mask      = MCLK_APBAMASK_TC0 | MCLK_APBAMASK_TC1,
        .gclk_id        = TC0_GCLK_ID,
        .gclk_src       = SAM0_GCLK_TIMER,
        .flags          = TC_CTRLA_MODE_COUNT32,
    },
    {   /* Timer 1 */
        .dev            = TC2,
        .irq            = TC2_IRQn,
        .mclk           = &MCLK->APBBMASK.reg,
        .mclk_mask      = MCLK_APBBMASK_TC2 | MCLK_APBBMASK_TC3,
        .gclk_id        = TC2_GCLK_ID,
        .gclk_src       = SAM0_GCLK_TIMER,
        .flags          = TC_CTRLA_MODE_COUNT32,
    }
};
 
/* Timer 0 configuration */
#define TIMER_0_CHANNELS    2
#define TIMER_0_ISR         isr_tc0
 
/* Timer 1 configuration */
#define TIMER_1_CHANNELS    2
#define TIMER_1_ISR         isr_tc2
 
#define TIMER_NUMOF         ARRAY_SIZE(timer_config)

static const spi_conf_t spi_config[] = {
    {   /* SPI on ISP */
        .dev      = &(SERCOM2->SPI),
        .miso_pin = GPIO_PIN(PA, 14), /* C: SERCOM2.2, D: SERCOM4.2 */
        .mosi_pin = GPIO_PIN(PA, 12), /* C: SERCOM2.0, D: SERCOM4.1 */
        .clk_pin  = GPIO_PIN(PA, 13), /* C: SERCOM2.1, D: SERCOM4.0 */
        .miso_mux = GPIO_MUX_C,
        .mosi_mux = GPIO_MUX_C,
        .clk_mux  = GPIO_MUX_C,
        .miso_pad = SPI_PAD_MISO_2,
        .mosi_pad = SPI_PAD_MOSI_0_SCK_1,
        .gclk_src = SAM0_GCLK_PERIPH,
#if MODULE_PERIPH_DMA
        .tx_trigger = SERCOM2_DMAC_ID_TX,
        .rx_trigger = SERCOM2_DMAC_ID_RX,
#endif
    },
#if !MODULE_PERIPH_UART
    {   /* D11=MOSI, D12=MISO, D13=SCK */
        .dev      = &(SERCOM3->SPI),
        .miso_pin = GPIO_PIN(PA, 17), /* C: SERCOM1.1, D: SERCOM3.0 */
        .mosi_pin = GPIO_PIN(PA, 19), /* C: SERCOM1.3, D: SERCOM3.3 */
        .clk_pin  = GPIO_PIN(PA, 16), /* C: SERCOM1.0, D: SERCOM3.1 */
        .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_3_SCK_1,
        .gclk_src = SAM0_GCLK_PERIPH,
#  if MODULE_PERIPH_DMA
        .tx_trigger = SERCOM3_DMAC_ID_TX,
        .rx_trigger = SERCOM3_DMAC_ID_RX,
#  endif
    },
#endif
#if MODULE_PERIPH_SPI_ON_QSPI
    {    /* QSPI in SPI mode */
        .dev      = QSPI,
        .miso_pin = SAM0_QSPI_PIN_DATA_1,
        .mosi_pin = SAM0_QSPI_PIN_DATA_0,
        .clk_pin  = SAM0_QSPI_PIN_CLK,
        .miso_mux = SAM0_QSPI_MUX,
        .mosi_mux = SAM0_QSPI_MUX,
        .clk_mux  = SAM0_QSPI_MUX,
        .miso_pad = SPI_PAD_MISO_0,         /* unused */
        .mosi_pad = SPI_PAD_MOSI_0_SCK_1,   /* unused */
        .gclk_src = SAM0_GCLK_MAIN,         /* unused */
#  if MODULE_PERIPH_DMA
        .tx_trigger = QSPI_DMAC_ID_TX,
        .rx_trigger = QSPI_DMAC_ID_RX,
#  endif
    },
#endif
};
 
#define SPI_NUMOF           ARRAY_SIZE(spi_config)

static const sam0_common_usb_config_t sam_usbdev_config[] = {
    {
        .dm     = GPIO_PIN(PA, 24),
        .dp     = GPIO_PIN(PA, 25),
        .d_mux  = GPIO_MUX_H,
        .device = &USB->DEVICE,
        .gclk_src = SAM0_GCLK_PERIPH,
    }
};

static const uart_conf_t uart_config[] = {
/* The UART pins can be routed to SERCOM3 (used by SPI) or
 * SERCOM5 (used by I2C). The pad configuration for SERCOM5
 * is impossible, as TXD cannot be routed to pad 1.
 * Hence, we let periph_spi and periph_uart conflict in
 * Makefile.features.
 */
    /* D0 = RXD, D1 = TXD */
    {
        .dev      = &SERCOM3->USART,
        .rx_pin   = GPIO_PIN(PA, 23),   /* C: SERCOM3.1, D: SERCOM5.0 */
        .tx_pin   = GPIO_PIN(PA, 22),   /* C: SERCOM3.0, D: SERCOM5.1 */
  #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_PERIPH,
    },
};
 
/* interrupt function name mapping */
#define UART_0_ISR          isr_sercom3_2
#define UART_0_ISR_TX       isr_sercom3_0
 
#define UART_NUMOF          ARRAY_SIZE(uart_config)
 
#ifdef __cplusplus
}
#endif