[SOFT-999] Completed Firmware 102 homework, request for code review

projects/timer_hw/README.md

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+<!--
+    General guidelines
+    These are just guidelines, not strict rules - document however seems best.
+    A README for a firmware-only project (e.g. Babydriver, MU, bootloader, CAN explorer) should answer the following questions:
+        - What is it?
+        - What problem does it solve?
+        - How do I use it? (with usage examples / example commands, etc)
+        - How does it work? (architectural overview)
+    A README for a board project (powering a hardware board, e.g. power distribution, centre console, charger, BMS carrier) should answer the following questions:
+        - What is the purpose of the board?
+        - What are all the things that the firmware needs to do?
+        - How does it fit into the overall system?
+        - How does it work? (architectural overview, e.g. what each module's purpose is or how data flows through the firmware)
+-->
+# timer_hw
+

projects/timer_hw/rules.mk

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+# Defines $(T)_SRC, $(T)_INC, $(T)_DEPS, and $(T)_CFLAGS for the build makefile.
+# Tests can be excluded by defining $(T)_EXCLUDE_TESTS.
+# Pre-defined:
+# $(T)_SRC_ROOT: $(T)_DIR/src
+# $(T)_INC_DIRS: $(T)_DIR/inc{/$(PLATFORM)}
+# $(T)_SRC: $(T)_DIR/src{/$(PLATFORM)}/*.{c,s}
+
+# Specify the libraries you want to include
+$(T)_DEPS := ms-common

projects/timer_hw/src/main.c

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+#include <stdint.h>
+#include <stdlib.h>
+
+#include "interrupt.h"
+#include "log.h"
+#include "soft_timer.h"
+#include "wait.h"
+
+#define COUNTER_PERIOD_MS 500
+
+typedef struct Counters {
+  uint8_t counter_a;
+  uint8_t counter_b;
+} Counters;
+
+void prv_timer_callback_2(SoftTimerId timer_id, void *context);
+
+void prv_timer_callback(SoftTimerId timer_id, void *context) {
+  Counters *storage = context;
+  storage->counter_a++;
+
+  LOG_DEBUG("Counter A: %i\n", storage->counter_a);
+
+  soft_timer_start_millis(COUNTER_PERIOD_MS, prv_timer_callback_2, storage, NULL);
+}
+
+void prv_timer_callback_2(SoftTimerId timer_id, void *context) {
+  Counters *storage = context;
+  storage->counter_a++;
+  storage->counter_b++;
+
+  LOG_DEBUG("Counter A: %i\n", storage->counter_a);
+  LOG_DEBUG("Counter B: %i\n", storage->counter_b);
+
+  soft_timer_start_millis(COUNTER_PERIOD_MS, prv_timer_callback, storage, NULL);
+}
+
+int main() {
+  interrupt_init();
+  soft_timer_init();
+
+  Counters storage = { 0 };
+
+  soft_timer_start_millis(COUNTER_PERIOD_MS, prv_timer_callback, &storage, NULL);
+
+  while (true) {
+    wait();
+  }
+
+  return 0;
+}