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reduce current draw in pre-recording sleep mode

This commit is contained in:
r4 2022-04-11 14:58:11 +02:00
parent eaa9c9044b
commit 3e39ea6c0e
1 changed files with 25 additions and 17 deletions
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42
spybug.ino
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@ -89,7 +89,17 @@ static int printf(const __FlashStringHelper *fmt, ...) {
#define print_special(x) {}
#endif
static void start_watchdog() {
#if defined(RECORDING_DELAY_IN_MINUTES) && RECORDING_DELAY_IN_MINUTES != 0
#include <LowPower.h> /* https://github.com/rocketscream/Low-Power */
static void low_power_sleep_minutes(unsigned long t) {
for (unsigned long i = 0; 8ul * i < 60ul * t; i++) {
/* Power down for 8s. */
LowPower.powerDown(SLEEP_8S, ADC_OFF, BOD_OFF);
}
}
#endif
static void start_watchdog_with_full_reset() {
MCUSR &= ~B00001000; /* Clear reset flag. */
WDTCSR |= B00011000; /* Prepare prescaler change. */
WDTCSR = B00100001; /* Set watchdog timeout to 8s. */
@ -127,13 +137,13 @@ File file;
volatile SAMPLE_BUF_TYPE sample_buffer[2][SAMPLE_BUF_SIZE];
volatile bool which_buffer = 0;
volatile uint16_t samples_in_buffer[2] = {0, 0};
volatile unsigned long int samples_hanging = 0;
volatile unsigned long int samples_written = 0;
volatile unsigned long int samples_dropped = 0;
volatile unsigned long samples_hanging = 0;
volatile unsigned long samples_written = 0;
volatile unsigned long samples_dropped = 0;
#ifdef DEBUG_RECORDING
volatile unsigned long int dbg_total = 0;
volatile unsigned long int dbg_sum = 0;
volatile unsigned long int dbg_samples = 0;
volatile unsigned long dbg_total = 0;
volatile unsigned long dbg_sum = 0;
volatile unsigned long dbg_samples = 0;
volatile int16_t dbg_min = 32767;
volatile int16_t dbg_max = -32768;
#endif
@ -231,13 +241,19 @@ static void wav_write_header(uint32_t nsamples) {
}
void setup() {
// Start Watchdog (wdt_enable() is broken somehow?!)
start_watchdog();
// Serial Setup
#ifdef SERIAL_OUTPUT
Serial.begin(9600); /* Set baud rate. */
setup_serial_in_out(); /* Add printf support. */
#endif
// Delay Triggering
#if defined(RECORDING_DELAY_IN_MINUTES) && RECORDING_DELAY_IN_MINUTES != 0
printf(F("Waiting %u minute%s before starting to record...\n"), RECORDING_DELAY_IN_MINUTES, RECORDING_DELAY_IN_MINUTES == 1 ? "" : "s");
Serial.flush();
low_power_sleep_minutes(RECORDING_DELAY_IN_MINUTES); /* Draws ~12.5mA instead of ~30mA when using delay(). */
#endif
// Start Watchdog (wdt_enable() doesn't fully reset)
start_watchdog_with_full_reset();
// SD Card Setup
if (!SD.begin(PIN_SS))
die(F("Error initializing SD card!\n"));
@ -248,14 +264,6 @@ void setup() {
filenum++;
snprintf(filename, 32, "rec_%03u.wav", filenum);
} while (SD.exists(filename));
// Delay Triggering
#if defined(RECORDING_DELAY_IN_MINUTES) && RECORDING_DELAY_IN_MINUTES != 0
wdt_disable(); /* Temporarily disable watchdog. */
printf(F("Filename: '%s'.\n"), filename);
printf(F("Waiting %u minute%s before starting to record...\n"), RECORDING_DELAY_IN_MINUTES, RECORDING_DELAY_IN_MINUTES == 1 ? "" : "s");
delay(60000ul * (unsigned long)(RECORDING_DELAY_IN_MINUTES));
start_watchdog(); /* Re-enable watchdog. */
#endif
// Open File
file = SD.open(filename, O_READ | O_WRITE | O_CREAT); /* Seeking doesn't seem to work with FILE_WRITE?! */
printf(F("Recording to file '%s'.\n"), filename);