From 8df4d636ab5d2a9af35093b9d9d15f1a23404267 Mon Sep 17 00:00:00 2001 From: Andrew Tridgell Date: Wed, 30 Oct 2013 09:45:58 +1100 Subject: [PATCH] SPI: added set_frequency() API this allows the bus speed to be changed on the fly by device drivers. This is needed for the MPU6000 --- src/drivers/device/spi.cpp | 6 ++++++ src/drivers/device/spi.h | 11 +++++++++++ 2 files changed, 17 insertions(+) diff --git a/src/drivers/device/spi.cpp b/src/drivers/device/spi.cpp index fa6b78d640..fed6c312c1 100644 --- a/src/drivers/device/spi.cpp +++ b/src/drivers/device/spi.cpp @@ -181,4 +181,10 @@ SPI::transfer(uint8_t *send, uint8_t *recv, unsigned len) return OK; } +void +SPI::set_frequency(uint32_t frequency) +{ + _frequency = frequency; +} + } // namespace device diff --git a/src/drivers/device/spi.h b/src/drivers/device/spi.h index 9103dca2ea..299575dc5c 100644 --- a/src/drivers/device/spi.h +++ b/src/drivers/device/spi.h @@ -101,6 +101,17 @@ protected: */ int transfer(uint8_t *send, uint8_t *recv, unsigned len); + /** + * Set the SPI bus frequency + * This is used to change frequency on the fly. Some sensors + * (such as the MPU6000) need a lower frequency for setup + * registers and can handle higher frequency for sensor + * value registers + * + * @param frequency Frequency to set (Hz) + */ + void set_frequency(uint32_t frequency); + /** * Locking modes supported by the driver. */