/**************************************************************************** * configs/b-l072z-lrwan1/src/stm32_spi.c * * Copyright (C) 2019 Gregory Nutt. All rights reserved. * Author: Mateusz Szafoni * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. 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. * 3. Neither the name NuttX 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 OWNER 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. * ****************************************************************************/ /**************************************************************************** * Included Files ****************************************************************************/ #include #include #include #include #include #include #include "up_arch.h" #include "chip.h" #include "stm32_gpio.h" #include "stm32_spi.h" #include "b-l072z-lrwan1.h" #include #ifdef CONFIG_STM32F0L0_SPI /**************************************************************************** * Pre-processor Definitions ****************************************************************************/ /**************************************************************************** * Private Function Prototypes ****************************************************************************/ /**************************************************************************** * Private Data ****************************************************************************/ /**************************************************************************** * Private Functions ****************************************************************************/ /**************************************************************************** * Public Functions ****************************************************************************/ /************************************************************************************ * Name: stm32_spidev_initialize * * Description: * Called to configure SPI chip select GPIO pins for the Nucleo-144 board. * ************************************************************************************/ void stm32_spidev_initialize(void) { /* NOTE: Clocking for SPI1 and/or SPI2 was already provided in stm32_rcc.c. * Configurations of SPI pins is performed in stm32_spi.c. * Here, we only initialize chip select pins unique to the board * architecture. */ #ifdef CONFIG_STM32F0L0_SPI1 # ifdef CONFIG_LPWAN_SX127X /* Configure the SPI-based SX127X chip select GPIO */ spiinfo("Configure GPIO for SX127X SPI1/CS\n"); stm32_configgpio(GPIO_SX127X_CS); stm32_gpiowrite(GPIO_SX127X_CS, true); # endif #endif } /**************************************************************************** * Name: stm32_spi1/2/select and stm32_spi1/2/status * * Description: * The external functions, stm32_spi1/2select and stm32_spi1/2status * must be provided by board-specific logic. They are implementations of * the select and status methods of the SPI interface defined by struct * spi_ops_s (see include/nuttx/spi/spi.h). All other methods (including * stm32_spibus_initialize()) are provided by common STM32 logic. To use this * common SPI logic on your board: * * 1. Provide logic in stm32_boardinitialize() to configure SPI chip select * pins. * 2. Provide stm32_spi1/2select() and stm32_spi1/2status() functions * in your board-specific logic. These functions will perform chip * selection and status operations using GPIOs in the way your board is * configured. * 3. Add a calls to stm32_spibus_initialize() in your low level application * initialization logic * 4. The handle returned by stm32_spibus_initialize() may then be used to bind * the SPI driver to higher level logic (e.g., calling * mmcsd_spislotinitialize(), for example, will bind the SPI driver to * the SPI MMC/SD driver). * ****************************************************************************/ #ifdef CONFIG_STM32F0L0_SPI1 void stm32_spi1select(FAR struct spi_dev_s *dev, uint32_t devid, bool selected) { spiinfo("devid: %d CS: %s\n", (int)devid, selected ? "assert" : "de-assert"); switch (devid) { #ifdef CONFIG_LPWAN_SX127X case SPIDEV_LPWAN(0): { spiinfo("SX127X device %s\n", selected ? "asserted" : "de-asserted"); /* Set the GPIO low to select and high to de-select */ stm32_gpiowrite(GPIO_SX127X_CS, !selected); break; } #endif default: { break; } } } uint8_t stm32_spi1status(FAR struct spi_dev_s *dev, uint32_t devid) { uint8_t status = 0; switch (devid) { #ifdef CONFIG_LPWAN_SX127X case SPIDEV_LPWAN(0): { status |= SPI_STATUS_PRESENT; break; } #endif default: { break; } } return status; } #endif /* CONFIG_STM32F0L0_SPI1 */ #ifdef CONFIG_STM32F0L0_SPI2 void stm32_spi2select(FAR struct spi_dev_s *dev, uint32_t devid, bool selected) { spiinfo("devid: %d CS: %s\n", (int)devid, selected ? "assert" : "de-assert"); } uint8_t stm32_spi2status(FAR struct spi_dev_s *dev, uint32_t devid) { return 0; } #endif /* CONFIG_STM32F0L0_SPI2 */ #endif /* CONFIG_STM32F0L0_SPI */