main.c

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#include <libents/controller/controller.h>
#include <libents/controller/modules/microsd.h>
#include <libtock-sync/services/alarm.h>
#include <stdbool.h>
#include <ulog.h>
 
#define LOG_LINE_SIZE 240
 
static void microsd_log_output(ulog_event* ev, void* arg) {
  (void)arg;
 
  // Guard against recursion. If anything reached from ControllerMicroSDLog()
  // ever logs, that log would re-enter this handler and recurse forever.
  static bool busy = false;
  if (busy) {
    return;
  }
  busy = true;
 
  // static to keep 128 bytes off the stack, matching microlog's own examples.
  // Safe despite being shared state because the busy guard above prevents
  // re-entry.
  static char line[LOG_LINE_SIZE];
  if (ulog_event_to_cstr(ev, line, sizeof(line)) == ULOG_STATUS_OK) {
    ControllerMicroSDLog(line, "example_log");
  }
 
  busy = false;
}
 
int main(void) {
  ulog_info("=== microSD log example ===");
 
  // Allocates the tx/rx buffers used by ControllerMicroSDLog(). Must happen
  // before the output is registered, otherwise the first forwarded line
  // encodes into a NULL buffer.
  ControllerInit();
 
  // Give the esp32 a moment to be ready to accept i2c traffic.
  libtocksync_alarm_delay_ms(100);
 
  ulog_output_id sd_output =
      ulog_output_add(microsd_log_output, NULL, ULOG_LEVEL_INFO);
  if (sd_output == ULOG_OUTPUT_INVALID) {
    // Almost always means ULOG_BUILD_EXTRA_OUTPUTS was not set when microlog
    // was compiled, see embedded/external/microlog/Makefile.
    ulog_error("Could not register microSD log output");
    return 1;
  }
 
  // This one goes to the console AND to /stm32.log on the card.
  ulog_info("hello world");
 
  ControllerDeinit();
 
  return 0;
}