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// #################################################################################################
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// # < neo430_exirqt.c - External interrupts controler driver functions > #
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// # ********************************************************************************************* #
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// # BSD 3-Clause License #
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// # #
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// # Copyright (c) 2020, Stephan Nolting. All rights reserved. #
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// # #
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// # Redistribution and use in source and binary forms, with or without modification, are #
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// # permitted provided that the following conditions are met: #
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// # #
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// # 1. Redistributions of source code must retain the above copyright notice, this list of #
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// # conditions and the following disclaimer. #
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// # #
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// # 2. Redistributions in binary form must reproduce the above copyright notice, this list of #
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// # conditions and the following disclaimer in the documentation and/or other materials #
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// # provided with the distribution. #
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// # #
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// # 3. Neither the name of the copyright holder nor the names of its contributors may be used to #
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// # endorse or promote products derived from this software without specific prior written #
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// # permission. #
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// # #
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// # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS #
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// # OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF #
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// # MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE #
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// # COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, #
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// # EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE #
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// # GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED #
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// # AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING #
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// # NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED #
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// # OF THE POSSIBILITY OF SUCH DAMAGE. #
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// # ********************************************************************************************* #
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// # The NEO430 Processor - https://github.com/stnolting/neo430 #
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// #################################################################################################
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#include "neo430.h"
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#include "neo430_exirq.h"
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// Private variables
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static uint16_t neo430_exirq_vectors[8] __attribute__((unused)); // do not ouput a warning when this variable is unused
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// Private function prototypes
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static void __attribute__((__interrupt__)) _exirq_irq_handler_(void);
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/* ------------------------------------------------------------
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* INFO Enable external interrupts controller
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* ------------------------------------------------------------ */
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void neo430_exirq_enable(void) {
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EXIRQ_CT |= (1<<EXIRQ_CT_EN);
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}
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/* ------------------------------------------------------------
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* INFO Disable external interrupts controller
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* ------------------------------------------------------------ */
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void neo430_exirq_disable(void) {
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EXIRQ_CT &= ~(1<<EXIRQ_CT_EN);
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}
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/* ------------------------------------------------------------
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* INFO Configure external interrupts controller
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* PARAM Struct containing the handler functions addresses and the channel enable bits
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* ------------------------------------------------------------ */
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void neo430_exirq_config(struct neo430_exirq_config_t config) {
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// reset controller
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EXIRQ_CT = 0;
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// get handler function address
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neo430_exirq_vectors[0] = config.address[0];
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neo430_exirq_vectors[1] = config.address[1];
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neo430_exirq_vectors[2] = config.address[2];
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neo430_exirq_vectors[3] = config.address[3];
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neo430_exirq_vectors[4] = config.address[4];
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neo430_exirq_vectors[5] = config.address[5];
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neo430_exirq_vectors[6] = config.address[6];
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neo430_exirq_vectors[7] = config.address[7];
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// set correct CPU external interrupts request handler address
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IRQVEC_EXT = (uint16_t)(&_exirq_irq_handler_);
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// configure channel enables
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uint16_t enable = (uint16_t)config.enable;
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EXIRQ_CT = (enable<<EXIRQ_CT_IRQ0_EN);
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}
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/* ------------------------------------------------------------
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* INFO Trigger IRQ channel by software
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* PARAM id (0..7) indicating which (ENABLED!) channel shall be triggered
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* ------------------------------------------------------------ */
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void neo430_exirq_sw_irq(uint8_t id) {
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uint16_t irq_sel = (uint16_t)(id & 7);
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// apply sw irq enable bit and according irq select
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uint16_t exirq_ctrl = EXIRQ_CT & (~(0b111 << EXIRQ_CT_SEL0)); // clear IRQ src output
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EXIRQ_CT = exirq_ctrl | (1<<EXIRQ_CT_SW_IRQ) | (irq_sel<<EXIRQ_CT_SEL0); // set dst. IRQ and set SW_IRQ flag
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}
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/* ------------------------------------------------------------
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* INFO Actual external interrupts controller IRQ handler
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* INFO This function is automatically installed
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* ------------------------------------------------------------ */
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static void __attribute__((__interrupt__)) _exirq_irq_handler_(void) {
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register uint16_t exirq_ctrl = EXIRQ_CT;
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EXIRQ_CT = exirq_ctrl | (1 << EXIRQ_CT_ACK_IRQ); // ACK IRQ
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register uint16_t src = exirq_ctrl & (0b111 << EXIRQ_CT_SEL0); // get IRQ source
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register uint16_t adr = neo430_exirq_vectors[src];
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asm volatile ("call %0" : : "r" (adr)); // call according handler
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}
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