/* * Copyright (C) 2020 Benjamin Valentin * * 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. */ /** * @ingroup boards_serpente * @{ * * @file * @brief Configuration of CPU peripherals for the Serpente board * * @author Benjamin Valentin */ #ifndef PERIPH_CONF_H #define PERIPH_CONF_H #include #include "cpu.h" #include "periph_cpu.h" #ifdef __cplusplus extern "C" { #endif /** * @name 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: * * CORECLOCK = ((PLL_MUL + 1) * 1MHz) / PLL_DIV * * 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: * * CORECLOCK = 8MHz / DIV * * NOTE: A core clock frequency below 1MHz is not recommended * * @{ */ #define CLOCK_USE_PLL (1) #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 */ #define CLOCK_CORECLOCK (((CLOCK_PLL_MUL + 1) * 1000000U) / CLOCK_PLL_DIV) #else /* edit this value to your needs */ #define CLOCK_DIV (1U) /* generate the actual core clock frequency */ #define CLOCK_CORECLOCK (8000000 / CLOCK_DIV) #endif /** @} */ /** * @name Timer peripheral configuration * @{ */ static const tc32_conf_t timer_config[] = { { /* Timer 0 - System Clock */ .dev = TC3, .irq = TC3_IRQn, .pm_mask = PM_APBCMASK_TC3, .gclk_ctrl = GCLK_CLKCTRL_ID_TCC2_TC3, #if CLOCK_USE_PLL || CLOCK_USE_XOSC32_DFLL .gclk_src = SAM0_GCLK_1MHZ, #else .gclk_src = SAM0_GCLK_MAIN, #endif .flags = TC_CTRLA_MODE_COUNT16, }, { /* 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, } }; #define TIMER_0_MAX_VALUE 0xffff /* interrupt function name mapping */ #define TIMER_0_ISR isr_tc3 #define TIMER_1_ISR isr_tc4 #define TIMER_NUMOF ARRAY_SIZE(timer_config) /** @} */ /** * @name UART configuration * @{ */ static const uart_conf_t uart_config[] = { { .dev = &SERCOM2->USART, .rx_pin = GPIO_PIN(PA, 9), /* D5 */ .tx_pin = GPIO_PIN(PA, 8), /* D4 */ .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, }, { .dev = &SERCOM0->USART, .rx_pin = GPIO_PIN(PA, 5), /* D1 */ .tx_pin = GPIO_PIN(PA, 4), /* D0 */ .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, } }; /* interrupt function name mapping */ #define UART_0_ISR isr_sercom2 #define UART_1_ISR isr_sercom0 #define UART_NUMOF ARRAY_SIZE(uart_config) /** @} */ /** * @name PWM configuration * @{ */ #define PWM_0_EN 1 #define PWM_1_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, 4), GPIO_MUX_E, 0 }, { GPIO_PIN(PA, 5), GPIO_MUX_E, 1 }, { GPIO_PIN(PA, 19), GPIO_MUX_F, 3 }, { GPIO_PIN(PA, 22), GPIO_MUX_F, 4 }, { GPIO_PIN(PA, 23), GPIO_MUX_F, 5 }, }; #endif #if PWM_1_EN /* PWM1 channels */ static const pwm_conf_chan_t pwm_chan1_config[] = { /* GPIO pin, MUX value, TCC channel */ { GPIO_PIN(PA, 6), GPIO_MUX_E, 0 }, { GPIO_PIN(PA, 7), GPIO_MUX_E, 1 }, }; #endif /* PWM device configuration */ static const pwm_conf_t pwm_config[] = { #if PWM_0_EN {TCC_CONFIG(TCC0), pwm_chan0_config, ARRAY_SIZE(pwm_chan0_config), SAM0_GCLK_MAIN}, #endif #if PWM_1_EN {TCC_CONFIG(TCC1), pwm_chan1_config, ARRAY_SIZE(pwm_chan1_config), SAM0_GCLK_MAIN}, #endif }; /* number of devices that are actually defined */ #define PWM_NUMOF ARRAY_SIZE(pwm_config) /** @} */ /** * @name SPI configuration * @{ */ static const spi_conf_t spi_config[] = { { /* Flash */ .dev = &SERCOM1->SPI, .miso_pin = GPIO_PIN(PA, 18), .mosi_pin = GPIO_PIN(PA, 16), .clk_pin = GPIO_PIN(PA, 17), .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_MAIN, #ifdef MODULE_PERIPH_DMA .tx_trigger = SERCOM1_DMAC_ID_TX, .rx_trigger = SERCOM1_DMAC_ID_RX, #endif }, { /* D0 … D2 (user pins) */ .dev = &SERCOM0->SPI, .miso_pin = GPIO_PIN(PA, 6), /* D2 */ .mosi_pin = GPIO_PIN(PA, 4), /* D0 */ .clk_pin = GPIO_PIN(PA, 5), /* D1 */ .miso_mux = GPIO_MUX_D, .mosi_mux = GPIO_MUX_D, .clk_mux = GPIO_MUX_D, .miso_pad = SPI_PAD_MISO_2, .mosi_pad = SPI_PAD_MOSI_0_SCK_1, .gclk_src = SAM0_GCLK_MAIN, #ifdef MODULE_PERIPH_DMA .tx_trigger = SERCOM0_DMAC_ID_TX, .rx_trigger = SERCOM0_DMAC_ID_RX, #endif }, }; #define SPI_NUMOF ARRAY_SIZE(spi_config) /** @} */ /** * @name I2C configuration * @{ */ static const i2c_conf_t i2c_config[] = { { .dev = &(SERCOM2->I2CM), .speed = I2C_SPEED_NORMAL, .scl_pin = GPIO_PIN(PA, 9), /* D5 */ .sda_pin = GPIO_PIN(PA, 8), /* D4 */ .mux = GPIO_MUX_D, .gclk_src = SAM0_GCLK_MAIN, .flags = I2C_FLAG_NONE } }; #define I2C_NUMOF ARRAY_SIZE(i2c_config) /** @} */ /** * @name RTT configuration * @{ */ #ifndef RTT_FREQUENCY #define RTT_FREQUENCY (32768U) /* in Hz. For changes see `rtt.c` */ #endif /** @} */ /** * @name ADC Default values * @{ */ #define ADC_PRESCALER ADC_CTRLB_PRESCALER_DIV512 #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_PA04 }, { .inputctrl = ADC_INPUTCTRL_MUXPOS_PA05 }, { .inputctrl = ADC_INPUTCTRL_MUXPOS_PA06 }, { .inputctrl = ADC_INPUTCTRL_MUXPOS_PA07 }, { .inputctrl = ADC_INPUTCTRL_MUXPOS_PA08 }, { .inputctrl = ADC_INPUTCTRL_MUXPOS_PA09 }, }; #define ADC_NUMOF ARRAY_SIZE(adc_channels) /** @} */ /** * @name USB peripheral configuration * @{ */ static const sam0_common_usb_config_t sam_usbdev_config[] = { { .dm = GPIO_PIN(PA, 24), .dp = GPIO_PIN(PA, 25), .d_mux = GPIO_MUX_G, .device = &USB->DEVICE, .gclk_src = SAM0_GCLK_MAIN, } }; /** @} */ #ifdef __cplusplus } #endif #endif /* PERIPH_CONF_H */ /** @} */