kopia lustrzana https://github.com/espressif/esp-idf
Merge branch 'bugfix/deep_sleep_flush_uart_v3.1' into 'release/v3.1'
sleep: fix flushing UARTs when entering deep sleep (backport v3.1) See merge request idf/esp-idf!2816pull/2666/head
commit
9b6769411a
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@ -141,6 +141,13 @@ void esp_deep_sleep(uint64_t time_in_us)
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esp_deep_sleep_start();
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}
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static void IRAM_ATTR flush_uarts()
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{
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for (int i = 0; i < 3; ++i) {
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uart_tx_wait_idle(i);
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}
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}
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static void IRAM_ATTR suspend_uarts()
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{
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for (int i = 0; i < 3; ++i) {
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@ -160,8 +167,14 @@ static void IRAM_ATTR resume_uarts()
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static uint32_t IRAM_ATTR esp_sleep_start(uint32_t pd_flags)
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{
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// Stop UART output so that output is not lost due to APB frequency change
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// Stop UART output so that output is not lost due to APB frequency change.
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// For light sleep, suspend UART output — it will resume after wakeup.
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// For deep sleep, wait for the contents of UART FIFO to be sent.
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if (pd_flags & RTC_SLEEP_PD_DIG) {
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flush_uarts();
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} else {
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suspend_uarts();
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}
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// Save current frequency and switch to XTAL
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rtc_cpu_freq_t cpu_freq = rtc_clk_cpu_freq_get();
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@ -136,6 +136,13 @@ Add the following code before :cpp:func:`esp_deep_sleep_start` to remove this ex
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rtc_gpio_isolate(GPIO_NUM_12);
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```
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UART output handling
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--------------------
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Before entering sleep mode, :cpp:func:`esp_deep_sleep_start` will flush the contents of UART FIFOs.
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When entering light sleep mode using :cpp:func:`esp_light_sleep_start`, UART FIFOs will not be flushed. Instead, UART output will be suspended, and remaining characters in the FIFO will be sent out after wakeup from light sleep.
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Checking sleep wakeup cause
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---------------------------
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