board/xplain-bc/init.c

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#include <led.h>
#include <gpio.h>
#include <board.h>
#include <interrupt.h>

#include <chip/regs.h>

void board_init(void)
{
        uint8_t         mcucr;
        irqflags_t      iflags;

        /*
         * Make sure no interrupts can come along and interfere with the cycle
         * critical operation to write the MCUCR register.
         */
        iflags = cpu_irq_save();

        /* Disable JTAG interface to make I/O lines available. */
        mcucr = avr_read_reg8(MCUCR) | AVR_BIT(MCUCR_JTD);
        avr_write_reg8(MCUCR, mcucr);
        avr_write_reg8(MCUCR, mcucr);

        cpu_irq_restore(iflags);

        /* Start up by holding the XMEGA reset line. */
        port_select_gpio_pin(BOARD_XMEGA_RESET_ID,
                        GPIO_DIR_OUTPUT | GPIO_INIT_LOW);

        /*
         * Initialize the RED LED deactivated and configure the USB mode switch
         * pin as an input line with pull-up enabled.
         */
        port_select_gpio_pin(BOARD_LED_RED, GPIO_DIR_OUTPUT | GPIO_INIT_HIGH);
        port_select_gpio_pin(BOARD_USB_MODE_ID, GPIO_DIR_INPUT | GPIO_PULL_UP);

        /* Finally set the SPI I/O lines for SPI master functionality. */
        board_gpio_set_spi_master_mode(true);
}

void board_gpio_mcu_reset(bool set)
{
        gpio_set_value(BOARD_XMEGA_RESET_ID, !set);
}

bool board_gpio_is_usb_msc_mode(void)
{
        return !gpio_get_value(BOARD_USB_MODE_ID);
}

void board_gpio_set_spi_master_mode(bool master_mode)
{
        if (master_mode) {
                /* Set the SPI interface in master mode. \todo revisit. */
                port_select_gpio_pin(BOARD_SPI_SCK_ID, GPIO_DIR_OUTPUT);
                port_select_gpio_pin(BOARD_SPI_MOSI_ID, GPIO_DIR_OUTPUT);
                port_select_gpio_pin(BOARD_SPI_MISO_ID, GPIO_DIR_INPUT);
        } else {
                /* Set the SPI interface in slave mode. \todo revisit. */
                port_select_gpio_pin(BOARD_SPI_SCK_ID, GPIO_DIR_INPUT);
                port_select_gpio_pin(BOARD_SPI_MOSI_ID, GPIO_DIR_INPUT);
                port_select_gpio_pin(BOARD_SPI_MISO_ID, GPIO_DIR_OUTPUT);
        }
}

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