esp32/machine_timer: Restrict timer numbers for ESP32C6 to 0 and 1.

The ESP32C6 has only one timer in each of the two groups.  Also add a check
for valid timer numbers.

Addresses issue #16438.

Signed-off-by: robert-hh <robert@hammelrath.com>

ports/esp32/machine_timer.c

@@ -66,7 +66,7 @@ static void machine_timer_print(const mp_print_t *print, mp_obj_t self_in, mp_pr
     machine_timer_obj_t *self = self_in;
     qstr mode = self->repeat ? MP_QSTR_PERIODIC : MP_QSTR_ONE_SHOT;
     uint64_t period = self->period / (TIMER_SCALE / 1000); // convert to ms
-    #if CONFIG_IDF_TARGET_ESP32C3
+    #if SOC_TIMER_GROUP_TIMERS_PER_GROUP == 1
     mp_printf(print, "Timer(%u, mode=%q, period=%lu)", self->group, mode, period);
     #else
     mp_printf(print, "Timer(%u, mode=%q, period=%lu)", (self->group << 1) | self->index, mode, period);
@@ -76,7 +76,7 @@ static void machine_timer_print(const mp_print_t *print, mp_obj_t self_in, mp_pr
 machine_timer_obj_t *machine_timer_create(mp_uint_t timer) {
 
     machine_timer_obj_t *self = NULL;
-    #if CONFIG_IDF_TARGET_ESP32C3
+    #if SOC_TIMER_GROUP_TIMERS_PER_GROUP == 1
     mp_uint_t group = timer & 1;
     mp_uint_t index = 0;
     #else
@@ -108,7 +108,11 @@ static mp_obj_t machine_timer_make_new(const mp_obj_type_t *type, size_t n_args,
     mp_arg_check_num(n_args, n_kw, 1, MP_OBJ_FUN_ARGS_MAX, true);
 
     // Create the new timer.
-    machine_timer_obj_t *self = machine_timer_create(mp_obj_get_int(args[0]));
+    uint32_t timer_number = mp_obj_get_int(args[0]);
+    if (timer_number >= SOC_TIMER_GROUP_TOTAL_TIMERS) {
+        mp_raise_ValueError(MP_ERROR_TEXT("invalid Timer number"));
+    }
+    machine_timer_obj_t *self = machine_timer_create(timer_number);
 
     if (n_args > 1 || n_kw > 0) {
         mp_map_t kw_args;