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49 lines
1.4 KiB
C
49 lines
1.4 KiB
C
/* Wake from deep sleep stub
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See esp_deepsleep.h esp_wake_deep_sleep() comments for details.
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*/
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#include <stddef.h>
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#include <sys/lock.h>
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#include "rom/cache.h"
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#include "rom/rtc.h"
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#include "soc/rtc_cntl_reg.h"
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#include "soc/dport_reg.h"
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#include "esp_attr.h"
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#include "esp_deepsleep.h"
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/* Updating RTC_MEMORY_CRC_REG register via set_rtc_memory_crc()
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is not thread-safe. */
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static _lock_t lock_rtc_memory_crc;
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esp_deep_sleep_wake_stub_fn_t esp_get_deep_sleep_wake_stub(void)
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{
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_lock_acquire(&lock_rtc_memory_crc);
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uint32_t stored_crc = REG_READ(RTC_MEMORY_CRC_REG);
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set_rtc_memory_crc();
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uint32_t calc_crc = REG_READ(RTC_MEMORY_CRC_REG);
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REG_WRITE(RTC_MEMORY_CRC_REG, stored_crc);
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_lock_release(&lock_rtc_memory_crc);
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if(stored_crc == calc_crc) {
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return (esp_deep_sleep_wake_stub_fn_t)REG_READ(RTC_ENTRY_ADDR_REG);
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} else {
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return NULL;
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}
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}
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void esp_set_deep_sleep_wake_stub(esp_deep_sleep_wake_stub_fn_t new_stub)
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{
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_lock_acquire(&lock_rtc_memory_crc);
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REG_WRITE(RTC_ENTRY_ADDR_REG, (uint32_t)new_stub);
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set_rtc_memory_crc();
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_lock_release(&lock_rtc_memory_crc);
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}
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void RTC_IRAM_ATTR esp_default_wake_deep_sleep(void) {
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/* Clear MMU for CPU 0 */
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REG_SET_BIT(DPORT_PRO_CACHE_CTRL1_REG, DPORT_PRO_CACHE_MMU_IA_CLR);
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REG_CLR_BIT(DPORT_PRO_CACHE_CTRL1_REG, DPORT_PRO_CACHE_MMU_IA_CLR);
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}
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void __attribute__((weak, alias("esp_default_wake_deep_sleep"))) esp_wake_deep_sleep(void);
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