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# Release Notes for STM32F401-Discovery Board Drivers Copyright © 2015 STMicroelectronics
## Update History ### V2.2.0 / 14-August-2015 Main Changes stm32f401_discovery.c Add AUDIO_IO_DeInit() function to align with BSP Components Common drivers V4.0.0 ### V2.1.3 / 02-March-2015 Main Changes stm32f401_discovery.c/.h Align to STM32F4xx HAL Driver V1.3.0 for __HAL_RCC_PPP_CLK_ENABLE() . ### V2.1.2 / 10-December-2014 Main Changes stm32f401_discovery_accelerometer.h, stm32f401_discovery_audio.h and stm32f401_discovery_gyroscope.h: Change "\" by "/" in the include path to fix compilation issue under Linux ### V2.1.1 / 26-June-2014 Main Changes stm32f401_discovery_audio.c/.h BSP_AUDIO_OUT_Play(): uses the buffer size in byte instead of half-word BSP_AUDIO_IN_PDMToPCM(): duplicates samples to make stereo audio stream (since a single microphone in mounted on STM32F401-Discovery) I2S2_Init(): configures the I2S to clock the microphone at 1.024 MHz as required instead of 2.048MHz ### V2.1.0 / 19-June-2014 Main Changes stm32f401_discovery.c/.h Enhance BSP_PB_Init() function by removing the call of __SYSCFG_CLK_ENABLE() already enabled in the HAL_GPIO_Init() stm32f401_discovery_audio.c/.h Add note that only the audio stereo format is supported stm32f401_discovery_gyroscope.c/.h Update BSP_GYRO_Init() to support new L3GD20 device ID (I_AM_L3GD20_TR) Comments clean up and typo corrections ### V2.0.0 / 18-February-2014 Main Changes Major update based on STM32Cube specification: drivers architecture and APIs modified vs. V1.0.1, and thus the 2 versions are not compatible. This version has to be used only with STM32CubeF4 based development ### V1.0.1 / 14-November-2013 Main Changes stm32f429i_discovery_l3gd20.c : Set SPI baudrate to 5.25 MHz to fit Gyroscope timing characteristics (Gyroscope l3gd20 SPI interface max baud rate is 10MHz for write/read) ### V1.0.0 / 11-September-2013 Main Changes First official version of the STM32F401-Discovery Board Drivers ## License Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. Neither the name of STMicroelectronics nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. For complete documentation on STM32 Microcontrollers visit www.st.com/STM32