1 files changed, 0 insertions, 250 deletions
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;
-
-}