From 59a6800cdf71b33cfdca7d35d53cb3e0d7108946 Mon Sep 17 00:00:00 2001
From: me-no-dev <hristo@espressif.com>
Date: Sun, 10 Sep 2017 20:24:41 +0300
Subject: [PATCH] Enable clocks for UART1 and 2

Recent change in IDF disables those clocks at boot. This change should
help with that.

Fixes: https://github.com/espressif/esp-idf/issues/975
---
 cores/esp32/esp32-hal-uart.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/cores/esp32/esp32-hal-uart.c b/cores/esp32/esp32-hal-uart.c
index 3f79f22a..222bbcb2 100644
--- a/cores/esp32/esp32-hal-uart.c
+++ b/cores/esp32/esp32-hal-uart.c
@@ -26,6 +26,7 @@
 #include "soc/uart_struct.h"
 #include "soc/io_mux_reg.h"
 #include "soc/gpio_sig_map.h"
+#include "soc/dport_reg.h"
 
 #define ETS_UART_INUM  5
 #define ETS_UART2_INUM  ETS_UART_INUM
@@ -190,7 +191,13 @@ uart_t* uartBegin(uint8_t uart_nr, uint32_t baudrate, uint32_t config, int8_t rx
             return NULL;
         }
     }
-
+    if(uart_nr == 1){
+        DPORT_SET_PERI_REG_MASK(DPORT_PERIP_CLK_EN_REG, DPORT_UART1_CLK_EN);
+        DPORT_CLEAR_PERI_REG_MASK(DPORT_PERIP_RST_EN_REG, DPORT_UART1_RST);
+    } else if(uart_nr == 2){
+        DPORT_SET_PERI_REG_MASK(DPORT_PERIP_CLK_EN_REG, DPORT_UART2_CLK_EN);
+        DPORT_CLEAR_PERI_REG_MASK(DPORT_PERIP_RST_EN_REG, DPORT_UART2_RST);
+    }
     uartFlush(uart);
     uartSetBaudRate(uart, baudrate);
     UART_MUTEX_LOCK();