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-rw-r--r--software/global_interrupts/.unsupported-boards2
-rw-r--r--software/global_interrupts/Makefile9
-rw-r--r--software/global_interrupts/global_interrupts.c250
3 files changed, 0 insertions, 261 deletions
diff --git a/software/global_interrupts/.unsupported-boards b/software/global_interrupts/.unsupported-boards
deleted file mode 100644
index 33cea3a..0000000
--- a/software/global_interrupts/.unsupported-boards
+++ /dev/null
@@ -1,2 +0,0 @@
-freedom-e300-arty
-freedom-e300-hifive1
diff --git a/software/global_interrupts/Makefile b/software/global_interrupts/Makefile
deleted file mode 100644
index 6a09f97..0000000
--- a/software/global_interrupts/Makefile
+++ /dev/null
@@ -1,9 +0,0 @@
-TARGET = global_interrupts
-CFLAGS += -O2 -fno-builtin-printf -DUSE_LOCAL_ISR
-
-BSP_BASE = ../../bsp
-
-C_SRCS += global_interrupts.c
-C_SRCS += $(BSP_BASE)/drivers/plic/plic_driver.c
-
-include $(BSP_BASE)/env/common.mk
diff --git a/software/global_interrupts/global_interrupts.c b/software/global_interrupts/global_interrupts.c
deleted file mode 100644
index 4d3a554..0000000
--- a/software/global_interrupts/global_interrupts.c
+++ /dev/null
@@ -1,250 +0,0 @@
-// See LICENSE for license details.
-
-#include <stdio.h>
-#include <stdlib.h>
-#include "platform.h"
-#include <string.h>
-#include "plic/plic_driver.h"
-#include "encoding.h"
-#include <unistd.h>
-
-#ifndef _SIFIVE_COREPLEXIP_ARTY_H
-#error 'global_interrupts' demo only supported for Coreplex IP Eval Kits
-#endif
-
-// Global Instance data for the PLIC
-// for use by the PLIC Driver.
-plic_instance_t g_plic;
-
-// Flag for state
-int g_switch1Wins;
-
-// Debounce counter (PWM can't go slow enough)
-int g_debounce;
-
-void debounce();
-
-// Structures for registering different interrupt handlers
-// for different parts of the application.
-typedef void (*interrupt_function_ptr_t) (void);
-
-// See bsp/env/<BOARD>/init.c for how this
-// interrupt vector is used.
-interrupt_function_ptr_t localISR[32];
-
-interrupt_function_ptr_t g_ext_interrupt_handlers[PLIC_NUM_INTERRUPTS];
-
-void set_timer() {
-
- 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 + 10*RTC_FREQ;
- *mtimecmp = then;
-
-}
-
-/*Entry Point for Machine Timer Interrupt Handler*/
-void mti_isr(){
-
- if (g_switch1Wins) {
- printf("#### Giving Switch 1 Priority for 10 seconds ####\n");
- // All other things being equal, lower IDs have
- // higher priority. We have already set
- // Switch 1 to priority 2
- // in the setup, so by giving these equal priority Switch 1 will win.
- PLIC_set_priority(&g_plic, INT_EXT_DEVICE_SW_2, 2);
- } else {
- printf("**** Giving Switch 2 Priority for 10 seconds ****\n");
- // By setting Switch 2 a higher integer priority, it will win over switch 1.
- PLIC_set_priority(&g_plic, INT_EXT_DEVICE_SW_2, 3);
- }
- g_switch1Wins ^= 0x1;
-
- set_timer();
-
-}
-
-/*Entry Point for PLIC Interrupt Handler*/
-void mei_isr(){
- plic_source int_num = PLIC_claim_interrupt(&g_plic);
- if ((int_num >=1 ) && (int_num < PLIC_NUM_INTERRUPTS)) {
- g_ext_interrupt_handlers[int_num]();
- }
- else {
- exit(1 + (uintptr_t) int_num);
- }
- PLIC_complete_interrupt(&g_plic, int_num);
-}
-
-const char * instructions_msg = " \
-\n\
- SIFIVE, INC.\n\
-E31/E51 Coreplex IP Eval Kit 'global_interrupts' demo.\n\
-\n\
-Switches 1 and 2 are enabled as External Global Interrupts \n\
-(they don't go through the PLIC). You an observe priorities.\n\
-Priorities invert every few seconds, which is driven by the \n\
-PWM0 global interrupt. \n\
-\n";
-
-void print_instructions() {
-
- write (STDOUT_FILENO, instructions_msg, strlen(instructions_msg));
-
-}
-
-void invalid_global_isr() {
- printf("Unexpected global interrupt!\n");
-}
-
-void invalid_local_isr() {
- printf ("Unexpected local interrupt!\n");
-}
-
-void switch_1_handler() {
-
- printf("Switch 1 is on! Even if Switch 2 is on, Switch 1 must have higher priority right now.\n");
-
- // Set Green LED
- GPIO_REG(GPIO_OUTPUT_VAL) |= (0x1 << GREEN_LED_OFFSET) ;
- GPIO_REG(GPIO_OUTPUT_VAL) &= ~((0x1<< RED_LED_OFFSET));
-
- debounce();
-
-}
-
-void switch_2_handler() {
- printf("Switch 2 is on! Even if Switch 1 is on, Switch 2 must have higher priority right now.\n");
-
- // Set RED LED
- GPIO_REG(GPIO_OUTPUT_VAL) &= ~(0x1 << GREEN_LED_OFFSET) ;
- GPIO_REG(GPIO_OUTPUT_VAL) |= (0x1<< RED_LED_OFFSET);
-
- debounce();
-}
-
-// We use PWM 0 as a
-// timer interrupt for debouncing.
-
-void pwm_0_handler() {
-
-
- if (g_debounce == 0) {
- printf(" Done debouncing.\n");
-
- //Lower the threshold s.t. the switches can hit.
- PLIC_set_threshold(&g_plic, 1);
-
- // Clear the PWM interrupt
- PWM0_REG(PWM_CFG) = 0;
-
- } else {
- // Keep waiting
- g_debounce --;
- // This clears out the interrupt and re-arms the timer.
- PWM0_REG(PWM_CFG) = ((PWM_CFG_ONESHOT) | (PWM_CFG_ZEROCMP)| 0x7 | (PWM_CFG_STICKY));
-
- }
-
-}
-
-void debounce(int local_interrupt_num) {
-
- printf(" Starting a debounce.\n");
-
- g_debounce = 600;
-
- // This clears out the interrupt and re-arms the timer.
- PWM0_REG(PWM_CFG) = ((PWM_CFG_ONESHOT) | (PWM_CFG_ZEROCMP)| 0x7 | (PWM_CFG_STICKY));
-
- // Set the threshold high enough that the
- // switches won't cause the interrupt to fire,
- // only the PWM or timer interrupts.
- PLIC_set_threshold(&g_plic, 4);
-
-}
-
-int main(int argc, char **argv)
-{
-
- for (int gisr = 0; gisr < PLIC_NUM_INTERRUPTS; gisr++){
- g_ext_interrupt_handlers[PLIC_NUM_INTERRUPTS] = invalid_global_isr;
- }
- g_ext_interrupt_handlers[PWM0_INT_BASE + 0] = pwm_0_handler;
- g_ext_interrupt_handlers[INT_EXT_DEVICE_SW_1] = switch_1_handler;
- g_ext_interrupt_handlers[INT_EXT_DEVICE_SW_2] = switch_2_handler;
-
- for (int lisr = 0; lisr < 32; lisr++){
- localISR[lisr] = invalid_local_isr;
- }
-
- localISR[IRQ_M_TIMER] = mti_isr;
- localISR[IRQ_M_EXT] = mei_isr;
-
- print_instructions();
-
- // Set up RGB LEDs for a visual.
-
- GPIO_REG(GPIO_OUTPUT_EN) |= ((0x1<< RED_LED_OFFSET)| (0x1<< GREEN_LED_OFFSET));
- GPIO_REG(GPIO_OUTPUT_VAL) |= (0x1 << GREEN_LED_OFFSET) ;
- GPIO_REG(GPIO_OUTPUT_VAL) &= ~(0x1<< RED_LED_OFFSET);
-
- /**************************************************************************
- * Set up the PLIC
- *
- *************************************************************************/
- PLIC_init(&g_plic,
- PLIC_CTRL_ADDR,
- PLIC_NUM_INTERRUPTS,
- PLIC_NUM_PRIORITIES);
-
- /**************************************************************************
- * Give Switch 1 and Switch 2 Equal priority of 2.
- *
- *************************************************************************/
-
- PLIC_enable_interrupt (&g_plic, PWM0_INT_BASE + 0);
- PLIC_enable_interrupt (&g_plic, INT_EXT_DEVICE_SW_1);
- PLIC_enable_interrupt (&g_plic, INT_EXT_DEVICE_SW_2);
-
- // PWM always beats the switches, because we use it
- // as a debouncer, and we lower the threshold
- // to do so.
-
- PWM0_REG(PWM_CFG) = 0;
-
- // Make sure people aren't blinded by LEDs connected here.
- PWM0_REG(PWM_CMP0) = 0xFE;
- PWM0_REG(PWM_CMP1) = 0xFF;
- PWM0_REG(PWM_CMP2) = 0xFF;
- PWM0_REG(PWM_CMP3) = 0xFF;
- PLIC_set_priority(&g_plic, PWM0_INT_BASE + 0 , 5);
-
- // Start the switches out at the same priority. Switch1
- // would win.
- PLIC_set_priority(&g_plic, INT_EXT_DEVICE_SW_1, 2);
- PLIC_set_priority(&g_plic, INT_EXT_DEVICE_SW_2, 2);
-
- // Set up machine timer interrupt. Every few seconds it
- // will invert the switch priorities.
- set_timer();
-
- // Enable timer interrupts.
- set_csr(mie, MIP_MTIP);
-
- // Enable Global (PLIC) interrupts.
- set_csr(mie, MIP_MEIP);
-
- g_switch1Wins = 1;
-
- // Enable all interrupts
- set_csr(mstatus, MSTATUS_MIE);
-
- while(1){
- asm volatile ("wfi");
- }
-
- return 0;
-
-}