From ab0ea2f6da9ca842fbb3bce90179daeb3580d3da Mon Sep 17 00:00:00 2001
From: me-no-dev <hristo@espressif.com>
Date: Mon, 18 Sep 2017 12:14:41 +0800
Subject: [PATCH] Fix missing method from SPI HAL

Fixes: https://github.com/espressif/arduino-esp32/issues/640
---
 cores/esp32/esp32-hal-spi.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/cores/esp32/esp32-hal-spi.c b/cores/esp32/esp32-hal-spi.c
index cd67f122..c017f6a4 100644
--- a/cores/esp32/esp32-hal-spi.c
+++ b/cores/esp32/esp32-hal-spi.c
@@ -680,6 +680,16 @@ void spiTransferBytes(spi_t * spi, uint8_t * data, uint8_t * out, uint32_t size)
     SPI_MUTEX_UNLOCK();
 }
 
+void spiTransferBits(spi_t * spi, uint32_t data, uint32_t * out, uint8_t bits)
+{
+    if(!spi) {
+        return;
+    }
+    SPI_MUTEX_LOCK();
+    spiTransferBitsNL(spi, data, out, bits);
+    SPI_MUTEX_UNLOCK();
+}
+
 /*
  * Manual Lock Management
  * */