boards/sodaq-autonomo/include/periph_conf.h File Reference

Configuration of CPU peripherals for the SODAQ Autonomo board. More...

Detailed Description

Configuration of CPU peripherals for the SODAQ Autonomo board.

Kees Bakker

Definition in file boards/sodaq-autonomo/include/periph_conf.h.

#include <stdint.h>
#include "cpu.h"
#include "periph_cpu.h"
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Go to the source code of this file.

External oscillator and clock configuration

For selection of the used CORECLOCK, we have implemented two choices:

  • usage of the PLL fed by the internal 8MHz oscillator divided by 8
  • usage of the internal 8MHz oscillator directly, divided by N if needed

The PLL option allows for the usage of a wider frequency range and a more stable clock with less jitter. This is why we use this option as default.

The target frequency is computed from the PLL multiplier and the PLL divisor. Use the following formula to compute your values:


NOTE: The PLL circuit does not run with less than 32MHz while the maximum PLL frequency is 96MHz. So PLL_MULL must be between 31 and 95!

The internal Oscillator used directly can lead to a slightly better power efficiency to the cost of a less stable clock. Use this option when you know what you are doing! The actual core frequency is adjusted as follows:


NOTE: A core clock frequency below 1MHz is not recommended

#define CLOCK_USE_PLL   (1)
#define CLOCK_PLL_MUL   (47U) /* must be >= 31 & <= 95 */
#define CLOCK_PLL_DIV   (1U) /* adjust to your needs */
#define CLOCK_CORECLOCK   (((CLOCK_PLL_MUL + 1) * 1000000U) / CLOCK_PLL_DIV)

Timer peripheral configuration

#define TIMER_NUMOF   (2U)
#define TIMER_0_EN   1
#define TIMER_1_EN   1
#define TIMER_0_DEV   TC3->COUNT16
#define TIMER_0_CHANNELS   2
#define TIMER_0_MAX_VALUE   (0xffff)
#define TIMER_0_ISR   isr_tc3
#define TIMER_1_DEV   TC4->COUNT32
#define TIMER_1_CHANNELS   2
#define TIMER_1_MAX_VALUE   (0xffffffff)
#define TIMER_1_ISR   isr_tc4

UART configuration

See Table 6.1 of the SAM D21 Datasheet

#define UART_0_ISR   isr_sercom0
#define UART_1_ISR   isr_sercom5
#define UART_2_ISR   isr_sercom4
#define UART_3_ISR   isr_sercom1
#define UART_NUMOF   (sizeof(uart_config) / sizeof(uart_config[0]))
static const uart_conf_t uart_config []

PWM configuration

#define PWM_0_EN   1
#define PWM_1_EN   1
#define PWM_MAX_CHANNELS   3
#define PWM_NUMOF   (2U)
static const pwm_conf_t pwm_config []

SPI configuration

#define SPI_NUMOF   (sizeof(spi_config) / sizeof(spi_config[0]))
static const spi_conf_t spi_config []

I2C configuration

#define I2C_NUMOF   (sizeof(i2c_config) / sizeof(i2c_config[0]))
static const i2c_conf_t i2c_config []

RTC configuration

#define RTC_NUMOF   (1U)
#define RTC_DEV   RTC->MODE2

RTT configuration

#define RTT_NUMOF   (1U)
#define RTT_DEV   RTC->MODE0
#define RTT_IRQ   RTC_IRQn
#define RTT_IRQ_PRIO   10
#define RTT_ISR   isr_rtc
#define RTT_MAX_VALUE   (0xffffffff)
#define RTT_FREQUENCY   (32768U) /* in Hz. For changes see `rtt.c` */
#define RTT_RUNSTDBY   (1) /* Keep RTT running in sleep states */

Variable Documentation

◆ i2c_config

const i2c_conf_t i2c_config[]
Initial value:
= {
.dev = &(SERCOM2->I2CM),
.speed = I2C_SPEED_NORMAL,
.scl_pin = GPIO_PIN(PA, 13),
.sda_pin = GPIO_PIN(PA, 12),
.mux = GPIO_MUX_C,
.flags = I2C_FLAG_NONE
select peripheral function C
#define GPIO_PIN(x, y)
Define a CPU specific GPIO pin generator macro.
normal mode: ~100kbit/s

Definition at line 216 of file boards/sodaq-autonomo/include/periph_conf.h.

◆ pwm_config

const pwm_conf_t pwm_config[]
Initial value:
= {
{TCC1, {
{ GPIO_PIN(PA, 6), GPIO_MUX_E, 0 },
{ GPIO_PIN(PA, 7), GPIO_MUX_E, 1 },
{ GPIO_UNDEF, (gpio_mux_t)0, 2 }
{TCC0, {
{ GPIO_PIN(PA, 16), GPIO_MUX_F, 0 },
{ GPIO_PIN(PA, 18), GPIO_MUX_F, 2 },
{ GPIO_PIN(PA, 19), GPIO_MUX_F, 3 }
select peripheral function E
select peripheral function F
Available MUX values for configuring a pin&#39;s alternate function.
#define GPIO_PIN(x, y)
Define a CPU specific GPIO pin generator macro.

Definition at line 168 of file boards/sodaq-autonomo/include/periph_conf.h.

◆ spi_config

const spi_conf_t spi_config[]
Initial value:
= {
.dev = &SERCOM3->SPI,
.miso_pin = GPIO_PIN(PA, 22),
.mosi_pin = GPIO_PIN(PA, 20),
.clk_pin = GPIO_PIN(PA, 21),
.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,
select peripheral function D
select peripheral function C
use pad 2 for MOSI, pad 3 for SCK
#define GPIO_PIN(x, y)
Define a CPU specific GPIO pin generator macro.

Definition at line 195 of file boards/sodaq-autonomo/include/periph_conf.h.