ibex_demo/src/system_init.c

#include "main.h"

__IO uint32_t SysTick;

void System_Init(void) {
    soc_uart.instance = UART0;
    xilinx_uartlite_init(&soc_uart);

    soc_gpio.instance = GPIO0;
    xilinx_gpio_init(&soc_gpio);

    SysTick = 0;

    // Enable interrupts
    __enable_irqs();
    __enable_mcount();

    // Setup systick timer
    TIMER0->TCSR0 = 0x112; // Generate mode, down count, auto-reload
    TIMER0->TLR0 = SYS_CLK_FREQ / SYS_TICK_RATE; // Set reload value
    TIMER0->TCSR0 |= (1U << 0x05);
    TIMER0->TCSR0 &= ~(1U << 0x05);

    __enable_irqn(TIMER_IRQn); // Enable timer interrupt

    TIMER0->TCSR0 |= (1U << 0x06) | (1U << 0x07); // Enable timer interrupt, enable counter.
}