alex/esp-idf
1
0
Fork 0
mirror of https://github.com/espressif/esp-idf.git synced 2025-08-15 06:26:49 +00:00
Code Issues Packages Projects Releases Wiki Activity

deep sleep: add option to delay CPU startup

Browse Source 
When ESP32 wakes up from deep sleep, flash is accessed an approximately 900us after power on.
Some flash chips need more time to become ready. This change adds a menuconfig option to add
some delay to the default deep sleep wake stub.

Fixes https://github.com/espressif/esp-idf/issues/117
This commit is contained in:
Ivan Grokhotkov
2016-12-12 23:20:15 +08:00
parent 3b854fe46a
commit eac80b0651
2 changed files with 26 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

7
components/esp32/deepsleep.c
View File

@@ -26,6 +26,7 @@
#include "driver/rtc_io.h"
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "sdkconfig.h"
/* Updating RTC_MEMORY_CRC_REG register via set_rtc_memory_crc()
is not thread-safe. */
@@ -66,6 +67,12 @@ void RTC_IRAM_ATTR esp_default_wake_deep_sleep(void) {
/* Clear MMU for CPU 0 */
REG_SET_BIT(DPORT_PRO_CACHE_CTRL1_REG, DPORT_PRO_CACHE_MMU_IA_CLR);
REG_CLR_BIT(DPORT_PRO_CACHE_CTRL1_REG, DPORT_PRO_CACHE_MMU_IA_CLR);
#if CONFIG_ESP32_DEEP_SLEEP_WAKEUP_DELAY > 0
// ROM code has not started yet, so we need to set delay factor
// used by ets_delay_us first.
ets_update_cpu_frequency(ets_get_detected_xtal_freq() / 1000000);
ets_delay_us(CONFIG_ESP32_DEEP_SLEEP_WAKEUP_DELAY);
#endif
}
void __attribute__((weak, alias("esp_default_wake_deep_sleep"))) esp_wake_deep_sleep(void);