1 
2 // Copyright 2015-2020 Espressif Systems (Shanghai) PTE LTD
3 //
4 // Licensed under the Apache License, Version 2.0 (the "License");
5 // you may not use this file except in compliance with the License.
6 // You may obtain a copy of the License at
7 //
8 //     http://www.apache.org/licenses/LICENSE-2.0
9 //
10 // Unless required by applicable law or agreed to in writing, software
11 // distributed under the License is distributed on an "AS IS" BASIS,
12 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 // See the License for the specific language governing permissions and
14 // limitations under the License.
15 
16 #include "soc/soc_caps.h"
17 
18 #if SOC_APB_BACKUP_DMA
19 #include "esp_attr.h"
20 #include "freertos/FreeRTOS.h"
21 #include "freertos/portmacro.h"
22 #include "esp32c3/rom/apb_backup_dma.h"
23 
24 static portMUX_TYPE s_apb_backup_dma_mutex = portMUX_INITIALIZER_UNLOCKED;
25 
apb_backup_dma_lock(void)26 static void IRAM_ATTR apb_backup_dma_lock(void)
27 {
28     if (xPortInIsrContext()) {
29         portENTER_CRITICAL_ISR(&s_apb_backup_dma_mutex);
30     } else {
31         portENTER_CRITICAL(&s_apb_backup_dma_mutex);
32     }
33 }
34 
apb_backup_dma_unlock(void)35 static void IRAM_ATTR apb_backup_dma_unlock(void)
36 {
37     if (xPortInIsrContext()) {
38         portEXIT_CRITICAL_ISR(&s_apb_backup_dma_mutex);
39     } else {
40         portEXIT_CRITICAL(&s_apb_backup_dma_mutex);
41     }
42 }
43 
esp_apb_backup_dma_lock_init(void)44 void esp_apb_backup_dma_lock_init(void)
45 {
46     ets_apb_backup_init_lock_func(apb_backup_dma_lock, apb_backup_dma_unlock);
47 }
48 #endif
49