From 5c1e7abf0e33901a38d0549d354a747949c6b0c2 Mon Sep 17 00:00:00 2001
From: Pat Hickey <pat@galois.com>
Date: Mon, 17 Dec 2012 17:12:15 -0800
Subject: [PATCH] AP_HAL_Empty: add spi driver transaction

---
 libraries/AP_HAL_Empty/SPIDriver.cpp | 4 ++++
 libraries/AP_HAL_Empty/SPIDriver.h   | 2 ++
 2 files changed, 6 insertions(+)

diff --git a/libraries/AP_HAL_Empty/SPIDriver.cpp b/libraries/AP_HAL_Empty/SPIDriver.cpp
index 77b717ac3a..9d432faf9e 100644
--- a/libraries/AP_HAL_Empty/SPIDriver.cpp
+++ b/libraries/AP_HAL_Empty/SPIDriver.cpp
@@ -14,6 +14,10 @@ AP_HAL::Semaphore* EmptySPIDeviceDriver::get_semaphore()
     return &_semaphore;
 }
 
+void EmptySPIDeviceDriver::transaction(const uint8_t *tx, uint8_t *rx, uint16_t len)
+{}
+
+
 void EmptySPIDeviceDriver::cs_assert()
 {}
 
diff --git a/libraries/AP_HAL_Empty/SPIDriver.h b/libraries/AP_HAL_Empty/SPIDriver.h
index 9ecd3c0d2d..c0315ca425 100644
--- a/libraries/AP_HAL_Empty/SPIDriver.h
+++ b/libraries/AP_HAL_Empty/SPIDriver.h
@@ -10,6 +10,8 @@ public:
     EmptySPIDeviceDriver();
     void init();
     AP_HAL::Semaphore* get_semaphore();
+    void transaction(const uint8_t *tx, uint8_t *rx, uint16_t len);
+
     void cs_assert();
     void cs_release();
     uint8_t transfer (uint8_t data);