/******************************************************************************
 * The MIT License
 *
 * Copyright (c) 2010 Perry Hung.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *****************************************************************************/

/**
 * @brief Nested interrupt controller routines
 */

#include "libmaple.h"
#include "nvic.h"
#include "systick.h"

void nvic_set_vector_table(uint32 addr, uint32 offset) {
    __write(SCB_VTOR, (uint32)addr | (offset & 0x1FFFFF80));
}

/**
 * @brief turn on interrupt number n
 * @param n interrupt number
 */
void nvic_irq_enable(uint32 n) {
    uint32 *iser = &((uint32*)NVIC_ISER0)[(n/32)];
    __write(iser, BIT(n % 32));
}

/**
 * @brief turn off interrupt number n
 * @param n interrupt number
 */
void nvic_irq_disable(uint32 n) {
    uint32 *icer = &((uint32*)NVIC_ICER0)[(n/32)];
    __write(icer, BIT(n % 32));
}

void nvic_irq_disable_all(void) {
    /* Each ICER register contains 1 bit per interrupt.  Writing a 1
       to that bit disables the corresponding interrupt.  So each of
       the following lines disables up to 32 interrupts at a time.
       Since low, medium, and high-density devices all have less than
       64 interrupts, this suffices. */
    /* TODO: fix for connectivity line: __write(NVIC_ICER2,1),
       requires connectivity line support in libmaple.h */
    __write(NVIC_ICER0, 0xFFFFFFFF);
    __write(NVIC_ICER1, 0xFFFFFFFF);
}

/**
 * @brief Initialize the NVIC according to VECT_TAB_FLASH,
 * VECT_TAB_RAM, or VECT_TAB_BASE.
 */
void nvic_init(void) {
#ifdef VECT_TAB_FLASH
    nvic_set_vector_table(USER_ADDR_ROM, 0x0);
#elif defined VECT_TAB_RAM
    nvic_set_vector_table(USER_ADDR_RAM, 0x0);
#elif defined VECT_TAB_BASE
    nvic_set_vector_table(((uint32)0x08000000), 0x0);
#else
#error "You must set a base address for the vector table!"
#endif
}