222 lines
6.7 KiB
C
222 lines
6.7 KiB
C
/****************************************************************************
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* boards/arm/imxrt/teensy-4.x/src/imxrt_spi.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <stdint.h>
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#include <stdbool.h>
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#include <errno.h>
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#include <debug.h>
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#include <nuttx/spi/spi.h>
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#include <arch/board/board.h>
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#include "arm_internal.h"
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#include "imxrt_lpspi.h"
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#include "imxrt_gpio.h"
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#include "teensy-4.h"
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#if defined(CONFIG_IMXRT_LPSPI1) || defined(CONFIG_IMXRT_LPSPI2) || \
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defined(CONFIG_IMXRT_LPSPI3) || defined(CONFIG_IMXRT_LPSPI4)
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: imxrt_spidev_initialize
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*
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* Description:
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* Called to configure SPI chip select GPIO pins for the imxrt1060-evk
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* board.
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*
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****************************************************************************/
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void weak_function imxrt_spidev_initialize(void)
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{
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#ifdef CONFIG_IMXRT_LPSPI3
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imxrt_config_gpio(GPIO_LPSPI3_CS); /* LPSPI3 chip select */
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#endif
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#ifdef CONFIG_IMXRT_LPSPI4
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imxrt_config_gpio(GPIO_LPSPI4_CS); /* LPSPI4 chip select */
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imxrt_config_gpio(GPIO_LCD_CD);
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#endif
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}
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/****************************************************************************
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* Name: imxrt_lpspi1/2/3select and imxrt_lpspi1/2/3status
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*
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* Description:
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* The external functions, imxrt_lpspi1/2/3select and imxrt_lpspi1/2/3status
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* must be provided by board-specific logic.
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* They are implementations of the select and status methods of the SPI
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* interface defined by struct spi_ops_s (see include/nuttx/spi/spi.h).
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* All other methods (including imxrt_lpspibus_initialize())
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* are provided by common STM32 logic.
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* To use this common SPI logic on your board:
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*
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* 1. Provide logic in imxrt_boardinitialize() to configure SPI chip select
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* pins.
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* 2. Provide imxrt_lpspi1/2/3select() and imxrt_lpspi1/2/3status()
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* functions in your board-specific logic.
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* These functions will perform chip selection and status operations
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* using GPIOs in the way your board is configured.
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* 3. Add a calls to imxrt_lpspibus_initialize() in your low level
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* application initialization logic
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* 4. The handle returned by imxrt_lpspibus_initialize() may then be used
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* to bind the SPI driver to higher level logic (e.g., calling
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* mmcsd_spislotinitialize(), for example, will bind the SPI driver to
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* the SPI MMC/SD driver).
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*
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****************************************************************************/
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#ifdef CONFIG_IMXRT_LPSPI1
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void imxrt_lpspi1select(struct spi_dev_s *dev, uint32_t devid,
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bool selected)
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{
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spiinfo("devid: %d CS: %s\n", (int)devid,
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selected ? "assert" : "de-assert");
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imxrt_gpio_write(GPIO_LPSPI1_CS, !selected);
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}
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uint8_t imxrt_lpspi1status(struct spi_dev_s *dev, uint32_t devid)
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{
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return 0;
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}
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#endif
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#ifdef CONFIG_IMXRT_LPSPI2
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void imxrt_lpspi2select(struct spi_dev_s *dev, uint32_t devid,
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bool selected)
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{
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spiinfo("devid: %d CS: %s\n", (int)devid,
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selected ? "assert" : "de-assert");
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imxrt_gpio_write(GPIO_LPSPI2_CS, !selected);
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}
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uint8_t imxrt_lpspi2status(struct spi_dev_s *dev, uint32_t devid)
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{
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return 0;
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}
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#endif
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#ifdef CONFIG_IMXRT_LPSPI3
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void imxrt_lpspi3select(struct spi_dev_s *dev, uint32_t devid,
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bool selected)
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{
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spiinfo("devid: %d CS: %s\n", (int)devid,
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selected ? "assert" : "de-assert");
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imxrt_gpio_write(GPIO_LPSPI3_CS, !selected);
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}
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uint8_t imxrt_lpspi3status(struct spi_dev_s *dev, uint32_t devid)
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{
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return 0;
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}
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#endif
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#ifdef CONFIG_IMXRT_LPSPI4
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void imxrt_lpspi4select(struct spi_dev_s *dev, uint32_t devid,
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bool selected)
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{
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spiinfo("devid: %d CS: %s\n", (int)devid,
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selected ? "assert" : "de-assert");
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if (devid == SPIDEV_DISPLAY(0))
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{
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imxrt_gpio_write(GPIO_LPSPI4_CS, !selected);
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}
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}
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uint8_t imxrt_lpspi4status(struct spi_dev_s *dev, uint32_t devid)
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{
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return 0;
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}
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#endif
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/****************************************************************************
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* Name: imxrt_lpspi1cmddata
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*
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* Description:
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* Set or clear the SH1101A A0 or SD1306 D/C n bit to select data (true)
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* or command (false). This function must be provided by platform-specific
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* logic. This is an implementation of the cmddata method of the SPI
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* interface defined by struct spi_ops_s (see include/nuttx/spi/spi.h).
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*
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* Input Parameters:
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*
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* spi - SPI device that controls the bus the device that requires the CMD/
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* DATA selection.
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* devid - If there are multiple devices on the bus, this selects which one
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* to select cmd or data. NOTE: This design restricts, for example,
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* one one SPI display per SPI bus.
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* cmd - true: select command; false: select data
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*
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* Returned Value:
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* None
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*
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****************************************************************************/
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#ifdef CONFIG_SPI_CMDDATA
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#ifdef CONFIG_IMXRT_LPSPI1
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int imxrt_lpspi1cmddata(struct spi_dev_s *dev, uint32_t devid, bool cmd)
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{
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return -ENODEV;
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}
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#endif
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#ifdef CONFIG_IMXRT_LPSPI2
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int imxrt_lpspi2cmddata(struct spi_dev_s *dev, uint32_t devid, bool cmd)
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{
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return -ENODEV;
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}
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#endif
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#ifdef CONFIG_IMXRT_LPSPI3
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int imxrt_lpspi3cmddata(struct spi_dev_s *dev, uint32_t devid, bool cmd)
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{
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return -ENODEV;
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}
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#endif
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#ifdef CONFIG_IMXRT_LPSPI4
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int imxrt_lpspi4cmddata(struct spi_dev_s *dev, uint32_t devid, bool cmd)
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{
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if (devid == SPIDEV_DISPLAY(0))
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{
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imxrt_gpio_write(GPIO_LCD_CD, !cmd);
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return OK;
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}
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else
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{
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return -ENODEV;
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}
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}
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#endif
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#endif /* CONFIG_SPI_CMDDATA */
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#endif /* CONFIG_IMXRT_LPSPI1 || CONFIG_IMXRT_LPSPI2 */
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