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-rw-r--r--software/vectored_interrupts/vectored_interrupts.c270
1 files changed, 0 insertions, 270 deletions
diff --git a/software/vectored_interrupts/vectored_interrupts.c b/software/vectored_interrupts/vectored_interrupts.c
deleted file mode 100644
index cb6a864..0000000
--- a/software/vectored_interrupts/vectored_interrupts.c
+++ /dev/null
@@ -1,270 +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;
-
-// Structures for registering different interrupt handlers
-// for different parts of the application.
-typedef void (*interrupt_function_ptr_t) (void);
-//array of function pointers which contains the PLIC
-//interrupt handlers
-interrupt_function_ptr_t g_ext_interrupt_handlers[PLIC_NUM_INTERRUPTS];
-
-//ecall countdown
-uint32_t ecall_countdown;
-//ecall macro used to store argument in a0
-#define ECALL(arg) ({ \
- register uintptr_t a0 asm ("a0") = (uintptr_t)(arg); \
- asm volatile ("ecall" \
- : "+r" (a0) \
- : \
- : "memory"); \
- a0; \
-})
-
-
-const char * instructions_msg = " \
-\n\
- SIFIVE, INC.\n\
-E31/E51 Coreplex IP Eval Kit 'vectored_interrupts' demo. \n\
-\n\
-This demo demonstrates Vectored Interrupts capabilities of\n\
-the E31/E51 Coreplex. The vector table is defined in \n\
-bsp/env/ventry.S \n\
-Button 0 is a global external interrupt routed to the PLIC.\n\
-Button 1 is a local interrupt.\n\
-Every 10 seconds, an ECALL is made. \n\
-\n";
-
-void print_instructions() {
-
- write (STDOUT_FILENO, instructions_msg, strlen(instructions_msg));
-
-}
-
-void set_timer() {
- static uint64_t then = 0;
-
- volatile uint64_t * mtime = (uint64_t*) (CLINT_CTRL_ADDR + CLINT_MTIME);
- volatile uint64_t * mtimecmp = (uint64_t*) (CLINT_CTRL_ADDR + CLINT_MTIMECMP);
- if(then != 0) {
- //next timer irq is 1 second from previous
- then += 1*RTC_FREQ;
- } else{ //first time setting the timer
- uint64_t now = *mtime;
- then = now + 1*RTC_FREQ;
- }
- *mtimecmp = then;
-
- set_csr(mie, MIP_MTIP);
-}
-
-/*Entry Point for Machine Timer Interrupt Handler*/
-/*called from bsp/env/ventry.s */
-void handle_m_time_interrupt(){
- static uint32_t onoff=1;
-
- clear_csr(mie, MIP_MTIP);
-
- //increment ecall_countdown
- ecall_countdown++;
-
- // Set Green LED
- if(onoff) {
- GPIO_REG(GPIO_OUTPUT_VAL) |= (0x1 << GREEN_LED_OFFSET) ;
- onoff=0;
- }else {
- GPIO_REG(GPIO_OUTPUT_VAL) &= ~((0x1 << GREEN_LED_OFFSET)) ;
- onoff=1;
- }
-
- set_timer();
- //re-enable button1 irq
- set_csr(mie, MIP_MLIP(LOCAL_INT_BTN_1));
-
-}
-
-/*Synchronous Trap Handler*/
-/*called from bsp/env/ventry.s */
-void handle_sync_trap(uint32_t arg0) {
- uint32_t exception_code = read_csr(mcause);
-
- //check for machine mode ecall
- if(exception_code == CAUSE_MACHINE_ECALL) {
- //reset ecall_countdown
- ecall_countdown = 0;
-
- //ecall argument is stored in a0 prior to
- //ECALL instruction.
- printf("ecall from M-mode: %d\n",arg0);
-
- //on exceptions, mepc points to the instruction
- //which triggered the exception, in order to
- //return to the next instruction, increment
- //mepc
- unsigned long epc = read_csr(mepc);
- epc += 4; //return to next instruction
- write_csr(mepc, epc);
-
- } else{
- printf("vUnhandled Trap:\n");
- _exit(1 + read_csr(mcause));
- }
-}
-
-/*Entry Point for PLIC Interrupt Handler*/
-/*called from bsp/env/ventry.s */
-void handle_m_external_interrupt(){
- printf("In PLIC handler\n");
- 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);
-}
-
-//default empty PLIC handler
-void invalid_global_isr() {
- printf("Unexpected global interrupt!\n");
-}
-
-/* b0 global interrupt isr */
-/*called from handle_m_external_interrupt */
-void button_0_handler() {
- static uint32_t onoff=1;
- // Set Green LED
-
- printf("In Button 0 handler\n");
-
- if(onoff) {
- GPIO_REG(GPIO_OUTPUT_VAL) |= (0x1 << BLUE_LED_OFFSET) ;
- onoff=0;
- }else {
- GPIO_REG(GPIO_OUTPUT_VAL) &= ~((0x1 << BLUE_LED_OFFSET)) ;
- onoff=1;
- }
-
- //clear irq - interrupt pending register is write 1 to clear
- GPIO_REG(GPIO_FALL_IP) |= (1<<BUTTON_0_OFFSET);
-}
-
-/*b1 local vectored irq handler */
-/*called from bsp/env/ventry.s */
-void handle_local_interrupt5() {
- static uint32_t onoff=1;
- // Set Green LED
-
- printf("In Button 1 handler\n");
-
- if(onoff) {
- GPIO_REG(GPIO_OUTPUT_VAL) |= (0x1 << RED_LED_OFFSET) ;
- onoff=0;
- }else {
- GPIO_REG(GPIO_OUTPUT_VAL) &= ~((0x1 << RED_LED_OFFSET)) ;
- onoff=1;
- }
-
- //debounce by turning off until next timer tick
- clear_csr(mie, MIP_MLIP(LOCAL_INT_BTN_1));
-}
-
-/*configures Button0 as a global gpio irq*/
-void b0_irq_init() {
-
- //dissable hw io function
- GPIO_REG(GPIO_IOF_EN ) &= ~(1 << BUTTON_0_OFFSET);
-
- //set to input
- GPIO_REG(GPIO_INPUT_EN) |= (1<<BUTTON_0_OFFSET);
- GPIO_REG(GPIO_PULLUP_EN) |= (1<<BUTTON_0_OFFSET);
-
- //set to interrupt on falling edge
- GPIO_REG(GPIO_FALL_IE) |= (1<<BUTTON_0_OFFSET);
-
- PLIC_init(&g_plic,
- PLIC_CTRL_ADDR,
- PLIC_NUM_INTERRUPTS,
- PLIC_NUM_PRIORITIES);
-
- PLIC_enable_interrupt (&g_plic, INT_DEVICE_BUTTON_0);
- PLIC_set_priority(&g_plic, INT_DEVICE_BUTTON_0, 2);
- g_ext_interrupt_handlers[INT_DEVICE_BUTTON_0] = button_0_handler;
-}
-
-/*configures Button1 as a local interrupt*/
-void b1_irq_init() {
-
- //enable the interrupt
- set_csr(mie, MIP_MLIP(LOCAL_INT_BTN_1));
-
-}
-
-/*turn down the brightness, and configure GPIO */
-void led_init() {
- // 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;
- // Set up RGB LEDs for a visual.
- GPIO_REG(GPIO_OUTPUT_EN) |= ((0x1<< RED_LED_OFFSET)| (0x1<< GREEN_LED_OFFSET)| (0x1<< BLUE_LED_OFFSET));
- GPIO_REG(GPIO_OUTPUT_VAL) &= ~((0x1<< RED_LED_OFFSET) | (0x1<< GREEN_LED_OFFSET) | (0x1<< BLUE_LED_OFFSET));
-
-}
-
-int main(int argc, char **argv)
-{
- uint32_t ecall_count = 0;
-
- //setup default global interrupt handler
- for (int gisr = 0; gisr < PLIC_NUM_INTERRUPTS; gisr++){
- g_ext_interrupt_handlers[PLIC_NUM_INTERRUPTS] = invalid_global_isr;
- }
-
- print_instructions();
-
- led_init();
- b0_irq_init();
- b1_irq_init();
-
- //initialize ecall_countdown
- ecall_countdown = 0;
-
- // Set up machine timer interrupt.
- set_timer();
-
- // Enable Global (PLIC) interrupts.
- set_csr(mie, MIP_MEIP);
-
- // Enable all interrupts
- set_csr(mstatus, MSTATUS_MIE);
-
-
- while(1){
- asm volatile ("wfi");
- //check if ecall_countdown is 10
- if(ecall_countdown == 10) {
- ECALL(ecall_count++);
- }
- //otherwise wfi
- }
-
- return 0;
-
-}
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