feat(rmt): added a help function for allocating encoder memory

The encoder memory location should respect the RMT_MEM_ALLOC_CAPS,
which is affected by some Kconfig options, like ISR_IRAM_SAFE

Closes #13032

components/driver/include/driver/rmt_encoder.h

@@ -149,6 +149,14 @@ esp_err_t rmt_del_encoder(rmt_encoder_handle_t encoder);
  */
 esp_err_t rmt_encoder_reset(rmt_encoder_handle_t encoder);
 
+/**
+ * @brief A helper function to allocate a proper memory for RMT encoder
+ *
+ * @param size Size of memory to be allocated
+ * @return Pointer to the allocated memory if the allocation is successful, NULL otherwise
+ */
+void* rmt_alloc_encoder_mem(size_t size);
+
 #ifdef __cplusplus
 }
 #endif

components/driver/rmt/rmt_encoder.c

@@ -258,7 +258,7 @@ esp_err_t rmt_new_bytes_encoder(const rmt_bytes_encoder_config_t *config, rmt_en
 {
     esp_err_t ret = ESP_OK;
     ESP_GOTO_ON_FALSE(config && ret_encoder, ESP_ERR_INVALID_ARG, err, TAG, "invalid argument");
-    rmt_bytes_encoder_t *encoder = heap_caps_calloc(1, sizeof(rmt_bytes_encoder_t), RMT_MEM_ALLOC_CAPS);
+    rmt_bytes_encoder_t *encoder = rmt_alloc_encoder_mem(sizeof(rmt_bytes_encoder_t));
     ESP_GOTO_ON_FALSE(encoder, ESP_ERR_NO_MEM, err, TAG, "no mem for bytes encoder");
     encoder->base.encode = rmt_encode_bytes;
     encoder->base.del = rmt_del_bytes_encoder;
@@ -287,7 +287,7 @@ esp_err_t rmt_new_copy_encoder(const rmt_copy_encoder_config_t *config,  rmt_enc
 {
     esp_err_t ret = ESP_OK;
     ESP_GOTO_ON_FALSE(config && ret_encoder, ESP_ERR_INVALID_ARG, err, TAG, "invalid argument");
-    rmt_copy_encoder_t *encoder = heap_caps_calloc(1, sizeof(rmt_copy_encoder_t), RMT_MEM_ALLOC_CAPS);
+    rmt_copy_encoder_t *encoder = rmt_alloc_encoder_mem(sizeof(rmt_copy_encoder_t));
     ESP_GOTO_ON_FALSE(encoder, ESP_ERR_NO_MEM, err, TAG, "no mem for copy encoder");
     encoder->base.encode = rmt_encode_copy;
     encoder->base.del = rmt_del_copy_encoder;
@@ -310,3 +310,8 @@ esp_err_t rmt_encoder_reset(rmt_encoder_handle_t encoder)
     ESP_RETURN_ON_FALSE(encoder, ESP_ERR_INVALID_ARG, TAG, "invalid argument");
     return encoder->reset(encoder);
 }
+
+void* rmt_alloc_encoder_mem(size_t size)
+{
+    return heap_caps_calloc(1, size, RMT_MEM_ALLOC_CAPS);
+}

components/driver/test_apps/rmt/main/test_util_rmt_encoders.c

@@ -80,7 +80,7 @@ static esp_err_t rmt_led_strip_encoder_reset(rmt_encoder_t *encoder)
 
 esp_err_t test_rmt_new_led_strip_encoder(rmt_encoder_handle_t *ret_encoder)
 {
-    rmt_led_strip_encoder_t *led_encoder = heap_caps_calloc(1, sizeof(rmt_led_strip_encoder_t), MALLOC_CAP_INTERNAL | MALLOC_CAP_8BIT);
+    rmt_led_strip_encoder_t *led_encoder = rmt_alloc_encoder_mem(sizeof(rmt_led_strip_encoder_t));
     led_encoder->base.encode = rmt_encode_led_strip;
     led_encoder->base.del = rmt_del_led_strip_encoder;
     led_encoder->base.reset = rmt_led_strip_encoder_reset;
@@ -195,7 +195,7 @@ static esp_err_t rmt_nec_protocol_encoder_reset(rmt_encoder_t *encoder)
 
 esp_err_t test_rmt_new_nec_protocol_encoder(rmt_encoder_handle_t *ret_encoder)
 {
-    rmt_nec_protocol_encoder_t *nec_encoder = heap_caps_calloc(1, sizeof(rmt_nec_protocol_encoder_t), MALLOC_CAP_INTERNAL | MALLOC_CAP_8BIT);
+    rmt_nec_protocol_encoder_t *nec_encoder = rmt_alloc_encoder_mem(sizeof(rmt_nec_protocol_encoder_t));
     nec_encoder->base.encode = rmt_encode_nec_protocol;
     nec_encoder->base.del = rmt_del_nec_protocol_encoder;
     nec_encoder->base.reset = rmt_nec_protocol_encoder_reset;

examples/peripherals/rmt/dshot_esc/main/dshot_esc_encoder.c

@@ -111,7 +111,7 @@ esp_err_t rmt_new_dshot_esc_encoder(const dshot_esc_encoder_config_t *config, rm
     esp_err_t ret = ESP_OK;
     rmt_dshot_esc_encoder_t *dshot_encoder = NULL;
     ESP_GOTO_ON_FALSE(config && ret_encoder, ESP_ERR_INVALID_ARG, err, TAG, "invalid argument");
-    dshot_encoder = calloc(1, sizeof(rmt_dshot_esc_encoder_t));
+    dshot_encoder = rmt_alloc_encoder_mem(sizeof(rmt_dshot_esc_encoder_t));
     ESP_GOTO_ON_FALSE(dshot_encoder, ESP_ERR_NO_MEM, err, TAG, "no mem for musical score encoder");
     dshot_encoder->base.encode = rmt_encode_dshot_esc;
     dshot_encoder->base.del = rmt_del_dshot_encoder;

examples/peripherals/rmt/ir_nec_transceiver/main/ir_nec_encoder.c

@@ -99,7 +99,7 @@ esp_err_t rmt_new_ir_nec_encoder(const ir_nec_encoder_config_t *config, rmt_enco
     esp_err_t ret = ESP_OK;
     rmt_ir_nec_encoder_t *nec_encoder = NULL;
     ESP_GOTO_ON_FALSE(config && ret_encoder, ESP_ERR_INVALID_ARG, err, TAG, "invalid argument");
-    nec_encoder = calloc(1, sizeof(rmt_ir_nec_encoder_t));
+    nec_encoder = rmt_alloc_encoder_mem(sizeof(rmt_ir_nec_encoder_t));
     ESP_GOTO_ON_FALSE(nec_encoder, ESP_ERR_NO_MEM, err, TAG, "no mem for ir nec encoder");
     nec_encoder->base.encode = rmt_encode_ir_nec;
     nec_encoder->base.del = rmt_del_ir_nec_encoder;

examples/peripherals/rmt/led_strip/main/led_strip_encoder.c

@@ -76,7 +76,7 @@ esp_err_t rmt_new_led_strip_encoder(const led_strip_encoder_config_t *config, rm
     esp_err_t ret = ESP_OK;
     rmt_led_strip_encoder_t *led_encoder = NULL;
     ESP_GOTO_ON_FALSE(config && ret_encoder, ESP_ERR_INVALID_ARG, err, TAG, "invalid argument");
-    led_encoder = calloc(1, sizeof(rmt_led_strip_encoder_t));
+    led_encoder = rmt_alloc_encoder_mem(sizeof(rmt_led_strip_encoder_t));
     ESP_GOTO_ON_FALSE(led_encoder, ESP_ERR_NO_MEM, err, TAG, "no mem for led strip encoder");
     led_encoder->base.encode = rmt_encode_led_strip;
     led_encoder->base.del = rmt_del_led_strip_encoder;

examples/peripherals/rmt/musical_buzzer/main/musical_score_encoder.c

@@ -53,7 +53,7 @@ esp_err_t rmt_new_musical_score_encoder(const musical_score_encoder_config_t *co
     esp_err_t ret = ESP_OK;
     rmt_musical_score_encoder_t *score_encoder = NULL;
     ESP_GOTO_ON_FALSE(config && ret_encoder, ESP_ERR_INVALID_ARG, err, TAG, "invalid argument");
-    score_encoder = calloc(1, sizeof(rmt_musical_score_encoder_t));
+    score_encoder = rmt_alloc_encoder_mem(sizeof(rmt_musical_score_encoder_t));
     ESP_GOTO_ON_FALSE(score_encoder, ESP_ERR_NO_MEM, err, TAG, "no mem for musical score encoder");
     score_encoder->base.encode = rmt_encode_musical_score;
     score_encoder->base.del = rmt_del_musical_score_encoder;

examples/peripherals/rmt/stepper_motor/main/stepper_motor_encoder.c

@@ -69,7 +69,7 @@ esp_err_t rmt_new_stepper_motor_curve_encoder(const stepper_motor_curve_encoder_
     ESP_GOTO_ON_FALSE(config && ret_encoder, ESP_ERR_INVALID_ARG, err, TAG, "invalid arguments");
     ESP_GOTO_ON_FALSE(config->sample_points, ESP_ERR_INVALID_ARG, err, TAG, "sample points number can't be zero");
     ESP_GOTO_ON_FALSE(config->start_freq_hz != config->end_freq_hz, ESP_ERR_INVALID_ARG, err, TAG, "start freq can't equal to end freq");
-    step_encoder = calloc(1, sizeof(rmt_stepper_curve_encoder_t) + config->sample_points * sizeof(rmt_symbol_word_t));
+    step_encoder = rmt_alloc_encoder_mem(sizeof(rmt_stepper_curve_encoder_t) + config->sample_points * sizeof(rmt_symbol_word_t));
     ESP_GOTO_ON_FALSE(step_encoder, ESP_ERR_NO_MEM, err, TAG, "no mem for stepper curve encoder");
     rmt_copy_encoder_config_t copy_encoder_config = {};
     ESP_GOTO_ON_ERROR(rmt_new_copy_encoder(&copy_encoder_config, &step_encoder->copy_encoder), err, TAG, "create copy encoder failed");
@@ -159,7 +159,7 @@ esp_err_t rmt_new_stepper_motor_uniform_encoder(const stepper_motor_uniform_enco
     esp_err_t ret = ESP_OK;
     rmt_stepper_uniform_encoder_t *step_encoder = NULL;
     ESP_GOTO_ON_FALSE(config && ret_encoder, ESP_ERR_INVALID_ARG, err, TAG, "invalid arguments");
-    step_encoder = calloc(1, sizeof(rmt_stepper_uniform_encoder_t));
+    step_encoder = rmt_alloc_encoder_mem(sizeof(rmt_stepper_uniform_encoder_t));
     ESP_GOTO_ON_FALSE(step_encoder, ESP_ERR_NO_MEM, err, TAG, "no mem for stepper uniform encoder");
     rmt_copy_encoder_config_t copy_encoder_config = {};
     ESP_GOTO_ON_ERROR(rmt_new_copy_encoder(&copy_encoder_config, &step_encoder->copy_encoder), err, TAG, "create copy encoder failed");