From 6a72084198b10df61b1cf85fb8340f864bc54031 Mon Sep 17 00:00:00 2001
From: Dan Halbert <halbert@halwitz.org>
Date: Wed, 12 Sep 2018 18:14:43 -0400
Subject: [PATCH] fix nrf builds; sphinx 1.8.0 crashing: use lower version

---
 .travis.yml                       | 2 +-
 ports/nrf/common-hal/busio/UART.c | 4 ++++
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/.travis.yml b/.travis.yml
index c1a4849cf5..3f123fe6eb 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -64,7 +64,7 @@ before_script:
   - if [[ $TRAVIS_BOARD = "feather_huzzah" ]]; then wget https://github.com/jepler/esp-open-sdk/releases/download/2018-06-10/xtensa-lx106-elf-standalone.tar.gz && tar xavf xtensa-lx106-elf-standalone.tar.gz; PATH=$(readlink -f xtensa-lx106-elf/bin):$PATH; fi
   # For coverage testing (upgrade is used to get latest urllib3 version)
   - ([[ -z "$TRAVIS_TEST" ]] || sudo pip install --upgrade cpp-coveralls)
-  - ([[ $TRAVIS_TEST != "docs" ]] || sudo pip install Sphinx sphinx-rtd-theme recommonmark)
+  - ([[ $TRAVIS_TEST != "docs" ]] || sudo pip install 'Sphinx<1.8.0' sphinx-rtd-theme recommonmark)
   - gcc --version
   - ([[ -z "$TRAVIS_BOARD" ]] || arm-none-eabi-gcc --version)
   - python3 --version
diff --git a/ports/nrf/common-hal/busio/UART.c b/ports/nrf/common-hal/busio/UART.c
index dbc6a85331..08b4bcd163 100644
--- a/ports/nrf/common-hal/busio/UART.c
+++ b/ports/nrf/common-hal/busio/UART.c
@@ -83,6 +83,10 @@ uint32_t common_hal_busio_uart_rx_characters_available(busio_uart_obj_t *self) {
     return 0;
 }
 
+void common_hal_busio_uart_clear_rx_buffer(busio_uart_obj_t *self) {
+    mp_raise_NotImplementedError("busio.UART not yet implemented");
+}
+
 bool common_hal_busio_uart_ready_to_tx(busio_uart_obj_t *self) {
     mp_raise_NotImplementedError("busio.UART not yet implemented");
     return false;