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authorDrew Barbier <dbarbi1@gmail.com>2018-07-11 21:34:21 -0700
committerGitHub <noreply@github.com>2018-07-11 21:34:21 -0700
commit67a27655c3b7d3955703850ca0ac6d4c8b6b38ca (patch)
treeba4b67cf6acd69ffb52c4d2177564d00aad02b1f /software/clic_interrupts
parentb091d1cabe70c84825a7f304d725010d2cf163d9 (diff)
parent7bf718778b9710238d791cefc67ac9c8720985e2 (diff)
Merge pull request #96 from sifive/clic-vectored
Clic vectored
Diffstat (limited to 'software/clic_interrupts')
-rw-r--r--software/clic_interrupts/Makefile8
-rw-r--r--software/clic_interrupts/clic.c231
2 files changed, 0 insertions, 239 deletions
diff --git a/software/clic_interrupts/Makefile b/software/clic_interrupts/Makefile
deleted file mode 100644
index 502534d..0000000
--- a/software/clic_interrupts/Makefile
+++ /dev/null
@@ -1,8 +0,0 @@
-TARGET = clic_interrupts
-CFLAGS += -O2 -fno-builtin-printf -DUSE_CLIC -DUSE_LOCAL_ISR
-
-BSP_BASE = ../../bsp
-
-C_SRCS += clic.c
-
-include $(BSP_BASE)/env/common.mk
diff --git a/software/clic_interrupts/clic.c b/software/clic_interrupts/clic.c
deleted file mode 100644
index ccf98b2..0000000
--- a/software/clic_interrupts/clic.c
+++ /dev/null
@@ -1,231 +0,0 @@
-// See LICENSE for license details.
-
-#include <stdio.h>
-#include <stdlib.h>
-#include "platform.h"
-#include <string.h>
-#include "encoding.h"
-#include <unistd.h>
-#include "sifive/devices/clic.h"
-
-#ifndef _SIFIVE_COREPLEXIP_ARTY_H
-#error 'local_interrupts' demo only supported for Coreplex IP Eval Kits
-#endif
-
-// Global Variable used to show
-// software interrupts.
-volatile uint32_t g_debouncing;
-
-void debounce();
-
-static void clic_enable(int offset) __attribute__((noinline));
-static void clic_enable(int offset)
-{
- CLIC_REG8(CLIC_INTCFG + offset) = 0xff;
- CLIC_REG8(CLIC_INTIE + offset) = 1;
-}
-
-static void clic_disable(int offset) __attribute__((noinline));
-static void clic_disable(int offset)
-{
- CLIC_REG8(CLIC_INTCFG + offset) = 0xff;
- CLIC_REG8(CLIC_INTIE + offset) = 0;
-}
-
-// Structures for registering different interrupt handlers
-// for different parts of the application.
-typedef void (*interrupt_function_ptr_t) (void);
-
-// This function enables some of the local interrupts sources
-// used in this demo -- just those for the buttons and
-// Switch 3.
-
-void enable_local_interrupts(){
- clic_enable(IRQ_M_LOCAL + LOCAL_INT_SW_3);
- clic_enable(IRQ_M_LOCAL + LOCAL_INT_BTN_0);
- clic_enable(IRQ_M_LOCAL + LOCAL_INT_BTN_1);
- clic_enable(IRQ_M_LOCAL + LOCAL_INT_BTN_2);
- clic_enable(IRQ_M_LOCAL + LOCAL_INT_BTN_3);
-}
-
-void disable_local_interrupts() {
- clic_disable(IRQ_M_LOCAL + LOCAL_INT_SW_3);
- clic_disable(IRQ_M_LOCAL + LOCAL_INT_BTN_0);
- clic_disable(IRQ_M_LOCAL + LOCAL_INT_BTN_1);
- clic_disable(IRQ_M_LOCAL + LOCAL_INT_BTN_2);
- clic_disable(IRQ_M_LOCAL + LOCAL_INT_BTN_3);
-}
-
-/*Entry Point for Machine Software Interrupt Handler*/
-void msi_isr() {
- const char msi_msg[] = " Debouncing: (this message due to Software Interrupt)\n\n";
- write (STDOUT_FILENO, msi_msg, strlen(msi_msg));
-
- //clear the SW interrupt
- CLIC_REG(CLIC_MSIP) = 0;
-}
-
-/*Entry Point for Machine Timer Interrupt Handler*/
-void mti_isr(){
- const char mti_msg[] = " Timer interrupt, done debouncing.\n\n";
- write (STDOUT_FILENO, mti_msg, strlen(mti_msg));
-
- // Disable the timer interrupt. The Debounce logic sets it.
- clic_disable(IRQ_M_TIMER);
-
- // Enable all the local interrupts
- enable_local_interrupts();
-}
-
-const char * instructions_msg = " \
-\n\
- SiFive, Inc\n\
- E21 Core IP Eval Kit 'clic_interrupts' demo.\n\
-\n\
-The Buttons 0-3 and Switch 3 are enabled as local\n\
-interrupts sources. A .5 s 'debounce' timer is used \n\
-between these interrupts. Software interrupts are\n\
-used to print a message while debouncing.\n\
-Note the priority of the interrupts sources.\n\
-\n";
-
-void print_instructions() {
-
- write (STDERR_FILENO, instructions_msg, strlen(instructions_msg));
-
-}
-
-void button_0_isr(void) {
-
- // Toggle Red LED
- const char button_0_msg[] = "Button 0 was pressed. Toggle Red.\n";
- write (STDOUT_FILENO, button_0_msg, strlen(button_0_msg));
- GPIO_REG(GPIO_OUTPUT_VAL) = GPIO_REG(GPIO_OUTPUT_VAL) ^ (0x1 << RED_LED_OFFSET);
- debounce();
-};
-
-void button_1_isr(void) {
-
- // Toggle Green LED
- const char button_1_msg[] = "Button 1 was pressed. Toggle Green.\n";
- write (STDOUT_FILENO, button_1_msg, strlen(button_1_msg));
- GPIO_REG(GPIO_OUTPUT_VAL) = GPIO_REG(GPIO_OUTPUT_VAL) ^ (0x1 << GREEN_LED_OFFSET);
- debounce();
-};
-
-
-void button_2_isr(void) {
-
- // Toggle Blue LED
- const char button_2_msg[] = "Button 2 was pressed. Toggle Blue.\n";
- write (STDOUT_FILENO, button_2_msg, strlen(button_2_msg));
- GPIO_REG(GPIO_OUTPUT_VAL) = GPIO_REG(GPIO_OUTPUT_VAL) ^ (0x1 << BLUE_LED_OFFSET);
- debounce();
-
-};
-
-void button_3_isr(void) {
- const char button_3_msg[] = "Button 3 was pressed! (No LEDs change).\n";
- write (STDOUT_FILENO, button_3_msg, strlen(button_3_msg));
- debounce();
-}
-
-void switch_3_isr(void) {
- const char sw_3_msg[] = "Switch 3 is on! But buttons have higher priority.\n";
- write (STDOUT_FILENO, sw_3_msg, strlen(sw_3_msg));
- debounce();
-}
-
-void debounce(int local_interrupt_num) {
- // Disable the most recent interrupt.
- // Don't enable it again until the timer goes off,
- // in .5 second.
-
- // Set the machine timer to go off in .5 seconds.
- // If the timer was already set to go off, this "cancels"
- // the current one.
-
- volatile uint64_t * mtime = (uint64_t*) (CLINT_CTRL_ADDR + CLINT_MTIME);
- volatile uint64_t * mtimecmp = (uint64_t*) (CLINT_CTRL_ADDR + CLINT_MTIMECMP);
- uint64_t now = *mtime;
- uint64_t then = now + .5*RTC_FREQ;
- *mtimecmp = then;
-
- disable_local_interrupts();
- g_debouncing = 1;
-
- // Enable the Machine-Timer bit in MIE
- clic_enable(IRQ_M_TIMER);
-}
-
-// See bsp/env/<BOARD>/init.c for how this
-// interrupt vector is used.
-
-interrupt_function_ptr_t localISR[32];
-
-static void unmapped_interrupt(void) {
- printf("unmapped interrupt");
- asm volatile ("1: j 1b" ::: "memory");
-}
-
-int main(int argc, char **argv)
-{
- // Configure LEDs as outputs.
- GPIO_REG(GPIO_INPUT_EN) &= ~((0x1<< RED_LED_OFFSET) | (0x1<< GREEN_LED_OFFSET) | (0x1 << BLUE_LED_OFFSET)) ;
- GPIO_REG(GPIO_OUTPUT_EN) |= ((0x1<< RED_LED_OFFSET)| (0x1<< GREEN_LED_OFFSET) | (0x1 << BLUE_LED_OFFSET)) ;
- GPIO_REG(GPIO_OUTPUT_VAL) |= (0x1 << BLUE_LED_OFFSET) ;
- GPIO_REG(GPIO_OUTPUT_VAL) &= ~((0x1<< RED_LED_OFFSET) | (0x1<< GREEN_LED_OFFSET)) ;
-
- // The Buttons and Switches which are used as local interrupt sources
- // do not go through the GPIO peripheral, so they do not need to
- // be configured as inputs.
-
- // Disable the timer & local interrupts until setup is done (they're
- // not reset by default)
-
- // Unconfigure the CLIC before doing anything
- for (int i = 0; i < 1024; ++i)
- CLIC_REG8(CLIC_INTIE + i) = 0;
-
- // Write down the software interrupt pending bit, as we shouldn't start out
- // by debouncing anything at all.
- CLIC_REG(CLIC_MSIP) = 0;
-
- for (int isr = 0; isr < 32; isr++)
- localISR[isr] = &unmapped_interrupt;
-
- localISR[IRQ_M_SOFT] = msi_isr;
- localISR[IRQ_M_TIMER] = mti_isr;
- localISR[IRQ_M_LOCAL + LOCAL_INT_SW_3] = switch_3_isr;
- localISR[IRQ_M_LOCAL + LOCAL_INT_BTN_0] = button_0_isr;
- localISR[IRQ_M_LOCAL + LOCAL_INT_BTN_1] = button_1_isr;
- localISR[IRQ_M_LOCAL + LOCAL_INT_BTN_2] = button_2_isr;
- localISR[IRQ_M_LOCAL + LOCAL_INT_BTN_3] = button_3_isr;
-
- // Set up the CLIC interrupt mechanism
- CLIC_REG(CLIC_CFG) = 4<<1; // nmBits=0; nlBits=4; nvBits=0
-
- print_instructions();
-
- enable_local_interrupts();
-
- g_debouncing = 0;
-
- // Enable SW interrupts as well in this demo.
- clic_enable(IRQ_M_SOFT);
-
- // Enable all global interrupts
- set_csr(mstatus, MSTATUS_MIE);
-
- volatile int foo = 1;
- while(foo){
- if (g_debouncing){
- //Trigger a SW interrupt
- CLIC_REG(CLIC_MSIP) = 1;
- g_debouncing = 0;
- }
- }
-
- return 0;
-
-}