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Interrupts1 lecture
commit 2ae5f12d27c6715406f88f1c67cfaace06c142ba Author: Julie Zelenski <[email protected]> Date: Fri Nov 8 10:05:47 2024 -0800 Interrupts1 lecture
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‎_data/unreleased.csv‎

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"/lectures/FloatingPoint_Sound/","Floating Point and Sound",false
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"/lectures/Guest/","Guest",false
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"/lectures/InfoSession/","Course Info Session",false
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"/lectures/Interrupts1/","Interrupts",false
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"/lectures/Interrupts2/","Interrupts, cont'd",false
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"/lectures/OOP/","Object-oriented programming",false
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"/lectures/Project/","Project",false

‎lectures/Interrupts1/README.md‎

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---
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released: true
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permalink: /lectures/Interrupts1/
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title: Interrupts
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readings: |
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In this first lecture on interrupts, we'll focus on the low-level mechanics and what needs to happen at the assembly level to enable and process an interrupt.
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+ [RiscV ISA Manual Vol II](/readings/riscv-privileged-20190608-1.pdf)
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---

‎lectures/Interrupts1/code/button-blocking/Makefile‎

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NAME = main
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ARCH = -march=rv64im -mabi=lp64
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ASFLAGS = $(ARCH)
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CFLAGS = $(ARCH) -g -Og -I$$CS107E/include -Wall -ffreestanding -fno-omit-frame-pointer
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LDFLAGS = -nostdlib -L$$CS107E/lib -T memmap.ld
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LDLIBS = -lmango -lmango_gcc
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all : $(NAME).bin
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%.bin: %.elf
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riscv64-unknown-elf-objcopy $< -O binary $@
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%.elf: %.o
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riscv64-unknown-elf-gcc $(LDFLAGS) $^ $(LDLIBS) -o $@
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%.o: %.c
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riscv64-unknown-elf-gcc $(CFLAGS) -c $< -o $@
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%.o: %.s
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riscv64-unknown-elf-as $(ASFLAGS) $< -o $@
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run: $(NAME).bin
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mango-run $<
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clean:
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rm -f *.o *.bin *.elf *.list *~
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.PHONY: all clean run
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.PRECIOUS: %.elf %.o

‎lectures/Interrupts1/code/button-blocking/echo.h‎

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#include "printf.h"
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// Cheezy way to echo console to uart
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static int both_printf(const char *format, ...)
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{
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char buf[1000];
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va_list args;
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va_start(args, format);
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vsnprintf(buf, sizeof(buf), format, args);
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va_end(args);
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console_printf(buf);
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return printf(buf);
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}
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#define console_printf both_printf

‎lectures/Interrupts1/code/button-blocking/main.c‎

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#include "console.h"
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#include "echo.h"
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#include "gpio.h"
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#include "gpio_extra.h"
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#include "uart.h"
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static int gCount = 0;
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static void update_screen(void) {
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console_clear();
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console_printf("\nCount of button presses\n");
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for (int r = 0; r < 80; r++) {
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console_printf("%4d ", gCount);
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}
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console_printf("\n");
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}
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static void wait_for_press(gpio_id_t button) {
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while (gpio_read(button) != 1) ; // loop until becomes high
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while (gpio_read(button) == 1) ; // loop while stays high
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gCount++;
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}
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void main(void) {
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gpio_id_t button = GPIO_PB4;
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uart_init();
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gpio_set_input(button);
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gpio_set_pullup(button);
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console_init(24, 50, GL_AMBER, 0xff222222);
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while (1) {
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console_printf("\nWaiting for button click...\n");
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wait_for_press(button);
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update_screen();
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}
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}

‎lectures/Interrupts1/code/button-interrupt/Makefile‎

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NAME = main
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ARCH = -march=rv64im -mabi=lp64
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ASFLAGS = $(ARCH)
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CFLAGS = $(ARCH) -g -Og -I$$CS107E/include -Wall -ffreestanding -fno-omit-frame-pointer
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LDFLAGS = -nostdlib -L$$CS107E/lib -T memmap.ld
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LDLIBS = -lmango -lmango_gcc
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all : $(NAME).bin
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%.bin: %.elf
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riscv64-unknown-elf-objcopy $< -O binary $@
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%.elf: %.o
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riscv64-unknown-elf-gcc $(LDFLAGS) $^ $(LDLIBS) -o $@
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%.o: %.c
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riscv64-unknown-elf-gcc $(CFLAGS) -c $< -o $@
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%.o: %.s
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riscv64-unknown-elf-as $(ASFLAGS) $< -o $@
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run: $(NAME).bin
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mango-run $<
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clean:
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rm -f *.o *.bin *.elf *.list *~
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.PHONY: all clean run
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.PRECIOUS: %.elf %.o

‎lectures/Interrupts1/code/button-interrupt/echo.h‎

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#include "printf.h"
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// Cheezy way to echo console to uart
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static int both_printf(const char *format, ...)
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{
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char buf[1000];
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va_list args;
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va_start(args, format);
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vsnprintf(buf, sizeof(buf), format, args);
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va_end(args);
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console_printf(buf);
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return printf(buf);
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}
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#define console_printf both_printf

‎lectures/Interrupts1/code/button-interrupt/main.c‎

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#include "backtrace.h"
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#include "console.h"
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#include "echo.h"
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#include "gpio.h"
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#include "gpio_extra.h"
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#include "gpio_interrupt.h"
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#include "uart.h"
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static volatile int gCount = 0;
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static void update_screen(void) {
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console_clear();
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console_printf("\nCount of button presses\n");
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for (int r = 0; r < 80; r++) {
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console_printf("%4d ", gCount);
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}
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console_printf("\n");
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}
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static void button_pressed(void *aux_data) {
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gCount++;
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gpio_id_t button = *(gpio_id_t *)aux_data;
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gpio_interrupt_clear(button);
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}
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void main(void) {
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gpio_id_t button = GPIO_PB4;
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uart_init();
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gpio_set_input(button);
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gpio_set_pullup(button);
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interrupts_init();
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gpio_interrupt_init();
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gpio_interrupt_config(button, GPIO_INTERRUPT_NEGATIVE_EDGE, false);
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gpio_interrupt_register_handler(button, button_pressed, &button);
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gpio_interrupt_enable(button);
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interrupts_global_enable();
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console_init(24, 50, GL_AMBER, 0xff222222);
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console_printf("\nWaiting for button click...\n");
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int last_count = gCount;
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while (1) {
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if (last_count != gCount) {
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update_screen();
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last_count = gCount;
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console_printf("\nWaiting for button click...\n");
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}
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}
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}

‎lectures/Interrupts1/code/console/Makefile‎

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NAME = console_main
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ARCH = -march=rv64im -mabi=lp64
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ASFLAGS = $(ARCH)
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CFLAGS = $(ARCH) -g -Og -I$$CS107E/include -Wall -ffreestanding -fno-omit-frame-pointer
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LDFLAGS = -nostdlib -L$$CS107E/lib -T memmap.ld
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LDLIBS = -lmango -lmango_gcc
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all : $(NAME).bin
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%.bin: %.elf
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riscv64-unknown-elf-objcopy $< -O binary $@
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%.elf: %.o
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riscv64-unknown-elf-gcc $(LDFLAGS) $^ $(LDLIBS) -o $@
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%.o: %.c
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riscv64-unknown-elf-gcc $(CFLAGS) -c $< -o $@
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%.o: %.s
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riscv64-unknown-elf-as $(ASFLAGS) $< -o $@
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run: $(NAME).bin
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mango-run $<
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clean:
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rm -f *.o *.bin *.elf *.list *~
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.PHONY: all clean run
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.PRECIOUS: %.elf %.o

‎lectures/Interrupts1/code/console/console_main.c‎

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#include "console.h"
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#include "gpio.h"
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#include "interrupts.h"
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#include "keyboard.h"
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#include "shell.h"
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#include "uart.h"
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extern void shell_set_extensions_enabled(bool); // extra features of ref library
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extern void console_enable_blink_cursor(void);
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/* This program tests the keyboard using the console.
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* Console reads from the keyboard and displays on screen.
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* If the keyboard is not using interrupts, it drops events
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* because the screen refresh is so time consuming.
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*/
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#define USE_INTERRUPTS 0
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void main(void) {
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gpio_init();
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uart_init();
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keyboard_init(KEYBOARD_CLOCK, KEYBOARD_DATA);
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console_init(30, 80, GL_AMBER, GL_BLACK);
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shell_set_extensions_enabled(true);
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shell_init(keyboard_read_next, console_printf);
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#if USE_INTERRUPTS
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interrupts_init();
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keyboard_use_interrupts();
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console_enable_blink_cursor();
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interrupts_global_enable();
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#endif
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shell_run();
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}

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