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Merge branch 'bugfix/deep_sleep_flush_uart' into 'master'

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sleep: fix flushing UARTs when entering deep sleep

See merge request idf/esp-idf!2698
This commit is contained in:
Ivan Grokhotkov
2018-07-18 14:55:13 +08:00
parent d62293165b 10c2cddddf
commit 0b78959070
2 changed files with 22 additions and 2 deletions
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components/esp32/sleep_modes.c
+15 -2
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@@ -141,6 +141,13 @@ void esp_deep_sleep(uint64_t time_in_us)
esp_deep_sleep_start();
}
static void IRAM_ATTR flush_uarts()
{
for (int i = 0; i < 3; ++i) {
uart_tx_wait_idle(i);
}
}
static void IRAM_ATTR suspend_uarts()
{
for (int i = 0; i < 3; ++i) {
@@ -160,8 +167,14 @@ static void IRAM_ATTR resume_uarts()
static uint32_t IRAM_ATTR esp_sleep_start(uint32_t pd_flags)
{
// Stop UART output so that output is not lost due to APB frequency change
suspend_uarts();
// Stop UART output so that output is not lost due to APB frequency change.
// For light sleep, suspend UART output — it will resume after wakeup.
// For deep sleep, wait for the contents of UART FIFO to be sent.
if (pd_flags & RTC_SLEEP_PD_DIG) {
flush_uarts();
} else {
suspend_uarts();
}
// Save current frequency and switch to XTAL
rtc_cpu_freq_t cpu_freq = rtc_clk_cpu_freq_get();