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Merge branch 'bugfix/esp32s2_startup_garbled_output' into 'master'

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esp_system: fix garbled UART output on startup on esp32s2

Closes IDFGH-7615

See merge request espressif/esp-idf!18549
This commit is contained in:
morris 2022-06-21 15:02:35 +08:00
commit d178d1d58a
1 changed files with 6 additions and 0 deletions
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6
components/esp_system/port/soc/esp32s2/clk.c
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@ -71,6 +71,12 @@ static void select_rtc_slow_clk(slow_clk_sel_t slow_clk);
soc_reset_reason_t rst_reas = esp_rom_get_reset_reason(0);
if (rst_reas == RESET_REASON_CHIP_POWER_ON) {
cfg.cali_ocode = 1;
/* Ocode calibration will switch to XTAL frequency, need to wait for UART FIFO
* to be empty, to avoid garbled output.
*/
if (CONFIG_ESP_CONSOLE_UART_NUM >= 0) {
esp_rom_uart_tx_wait_idle(CONFIG_ESP_CONSOLE_UART_NUM);
}
}
rtc_init(cfg);