59 lines
2.1 KiB
C
59 lines
2.1 KiB
C
/*******************************************************************************
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*
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* ttn-esp32 - The Things Network device library for ESP-IDF / SX127x
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*
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* Copyright (c) 2018-2021 Manuel Bleichenbacher
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*
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* Licensed under MIT License
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* https://opensource.org/licenses/MIT
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*
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* Functions for storing and retrieving TTN communication state from RTC memory.
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*******************************************************************************/
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#include "ttn_rtc.h"
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#include "esp_system.h"
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#include "lmic/lmic.h"
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#include <string.h>
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#define LMIC_OFFSET(field) __builtin_offsetof(struct lmic_t, field)
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#define LMIC_DIST(field1, field2) (LMIC_OFFSET(field2) - LMIC_OFFSET(field1))
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#define TTN_RTC_MEM_SIZE (sizeof(struct lmic_t) - LMIC_OFFSET(radio) - MAX_LEN_PAYLOAD - MAX_LEN_FRAME)
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#define TTN_RTC_FLAG_VALUE 0xf30b84ce
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RTC_DATA_ATTR uint8_t ttn_rtc_mem_buf[TTN_RTC_MEM_SIZE];
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RTC_DATA_ATTR uint32_t ttn_rtc_flag;
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void ttn_rtc_save()
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{
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// Copy LMIC struct except client, osjob, pendTxData and frame
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size_t len1 = LMIC_DIST(radio, pendTxData);
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memcpy(ttn_rtc_mem_buf, &LMIC.radio, len1);
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size_t len2 = LMIC_DIST(pendTxData, frame) - MAX_LEN_PAYLOAD;
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memcpy(ttn_rtc_mem_buf + len1, (u1_t *)&LMIC.pendTxData + MAX_LEN_PAYLOAD, len2);
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size_t len3 = sizeof(struct lmic_t) - LMIC_OFFSET(frame) - MAX_LEN_FRAME;
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memcpy(ttn_rtc_mem_buf + len1 + len2, (u1_t *)&LMIC.frame + MAX_LEN_FRAME, len3);
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ttn_rtc_flag = TTN_RTC_FLAG_VALUE;
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}
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bool ttn_rtc_restore()
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{
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if (ttn_rtc_flag != TTN_RTC_FLAG_VALUE)
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return false;
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// Restore data
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size_t len1 = LMIC_DIST(radio, pendTxData);
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memcpy(&LMIC.radio, ttn_rtc_mem_buf, len1);
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memset(LMIC.pendTxData, 0, MAX_LEN_PAYLOAD);
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size_t len2 = LMIC_DIST(pendTxData, frame) - MAX_LEN_PAYLOAD;
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memcpy((u1_t *)&LMIC.pendTxData + MAX_LEN_PAYLOAD, ttn_rtc_mem_buf + len1, len2);
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memset(LMIC.frame, 0, MAX_LEN_FRAME);
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size_t len3 = sizeof(struct lmic_t) - LMIC_OFFSET(frame) - MAX_LEN_FRAME;
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memcpy((u1_t *)&LMIC.frame + MAX_LEN_FRAME, ttn_rtc_mem_buf + len1 + len2, len3);
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ttn_rtc_flag = 0xffffffff; // invalidate RTC data
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return true;
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}
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