Demonstrate sleep mode and interrupts

This commit is contained in:
Savanni D'Gerinel 2022-07-16 17:31:24 -04:00
parent a81d8cec6b
commit 221dcd1541
2 changed files with 99 additions and 1 deletions

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@ -327,7 +327,7 @@
lib = pkgs.lib;
avr = pkgs.pkgsCross.avr.buildPackages;
in pkgs.stdenv.mkDerivation rec {
name = "prime-tx";
name = "radio-rx";
src = ./.;
buildInputs = [
@ -353,6 +353,39 @@
'';
};
packages."x86_64-linux"."interrupts-standalone" = (packages."x86_64-linux"."interrupts" atmega32u4);
packages."x86_64-linux"."interrupts" =
{ mcu, chip_select, f_cpu }:
let
pkgs = import nixpkgs { system = "x86_64-linux"; };
lib = pkgs.lib;
avr = pkgs.pkgsCross.avr.buildPackages;
in pkgs.stdenv.mkDerivation rec {
name = "interrupts";
src = ./.;
buildInputs = [
(packages."x86_64-linux"."base" { inherit mcu chip_select f_cpu; })
(packages."x86_64-linux"."shift-register" { inherit mcu chip_select f_cpu; })
(packages."x86_64-linux"."display" { inherit mcu chip_select f_cpu; })
];
CFLAGS = cflags { inherit mcu chip_select f_cpu; };
INCLUDE_DIRS = pkgs.lib.concatStringsSep " " (map (dir: "-I${dir}") buildInputs);
OBJECT_FILES = pkgs.lib.concatStringsSep " " (map (dir: "${dir}/*.o") buildInputs);
buildPhase = ''
${avr.gcc}/bin/avr-gcc ${CFLAGS} ${INCLUDE_DIRS} -o main.o -c ${src}/interrupts/main.c
${avr.gcc}/bin/avr-gcc ${CFLAGS} -o interrupts.elf main.o ${OBJECT_FILES}
$OBJCOPY -O ihex interrupts.elf interrupts.hex
'';
installPhase = ''
mkdir $out
cp interrupts.elf interrupts.hex $out
'';
};
devShell."x86_64-linux" =
let
pkgs = import nixpkgs { system = "x86_64-linux"; };

65
interrupts/main.c Normal file
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@ -0,0 +1,65 @@
#include <base.h>
#include <display.h>
#include <stdbool.h>
#include <stdio.h>
#include <avr/sleep.h>
#include <avr/interrupt.h>
dio_t light = { .ddr = &DDRC, .port = &PORTC, .pin = &PINC, .addr = 7 };
dio_t interrupt_line = { .ddr = &DDRD, .port = &PORTD, .pin = &PIND, .addr = 2 };
bool button_values[4] = { false, false, false, false };
dio_t buttons[4] = {
{ .ddr = &DDRD, .port = &PORTD, .pin = &PIND, .addr = 6 },
{ .ddr = &DDRB, .port = &PORTB, .pin = &PINB, .addr = 7 },
{ .ddr = &DDRB, .port = &PORTB, .pin = &PINB, .addr = 6 },
{ .ddr = &DDRB, .port = &PORTB, .pin = &PINB, .addr = 5 },
};
ISR(INT2_vect) {
dio_set(&light, 1);
for (int i = 0; i < 4; i++) {
button_values[i] = dio_read(&buttons[i]);
}
}
void display_buttons(display_t *display) {
char msg[16];
snprintf(msg, 16, ": %d %d %d %d", button_values[0], button_values[1], button_values[2], button_values[3]);
display_clear(display);
display_write_message(display, msg);
}
int main(void) {
EIMSK = 1 << INT2;
EICRA |= 1 << ISC21 | 1 << ISC20;
display_t display = {
.reg = {
.output = { .ddr = &DDRF, .port = &PORTF, .pin = &PINF, .addr = 7 },
.shift_clock = { .ddr = &DDRF, .port = &PORTF, .pin = &PINF, .addr = 6 },
.latch_clock = { .ddr = &DDRF, .port = &PORTF, .pin = &PINF, .addr = 5 },
}
};
display_init(&display);
dio_set_direction(&light, LINE_OUT);
dio_set_direction(&interrupt_line, LINE_IN);
for (int i = 0; i < 4; i++) {
dio_set_direction(&buttons[i], LINE_IN);
}
set_sleep_mode(SLEEP_MODE_IDLE);
while (1) {
display_buttons(&display);
dio_set(&light, 0);
sei();
sleep_mode();
cli();
}
return 0;
}