203 lines
7.5 KiB
C
203 lines
7.5 KiB
C
/************************************************************************************
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* configs/teensy/src/up_spi.c
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* arch/arm/src/board/up_spi.c
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*
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* Copyright (C) 2011 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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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 <debug.h>
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#include <nuttx/spi.h>
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#include <arch/board/board.h>
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#include <avr/io.h>
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#include "up_arch.h"
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#include "chip.h"
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#include "at90Usb_internal.h"
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#include "teensy_internal.h"
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#ifdef CONFIG_AVR_SPI
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/************************************************************************************
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* Definitions
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************************************************************************************/
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/* Teensy SPI Connection
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*
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* -- ---- -- ------------------------- -------
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* J2 NAME PIN NAME PAD
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* -- ---- -- ------------------------- -------
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* 1 VIN -- Connected to USB +RV
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* 2 GND -- Connected to USB GND
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* 3 3V3 -- Not used ---
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* 4 NC -- Not used
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* 5 CS 10 (SS/PCINT0) PB0 Pad B0
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* 6 DI 12 (PDI/PCINT2/MOSI) PB2 Pad B2
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* 7 SCK 11 (PCINT1/SCLK) PB1 Pad B1
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* 8 DO 13 (PDO/PCINT3/MISO) PB3 Pad B3
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* 9 IRQ -- Not used ---
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* 10 CD 14 (PCINT4/OC.2A) PB4 Pad B4
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* 11 WP 15 (PCINT5/OC.1A) PB5 Pad B5
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* -- ---- -- ------------------------- -------
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*/
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#define TEENSY_CS (1 << 0)
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#define TEENSY_CD (1 << 4)
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#define TEENSY_WP (1 << 5)
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/* The following enable debug output from this file (needs CONFIG_DEBUG too).
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*
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* CONFIG_SPI_DEBUG - Define to enable basic SSP debug
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* CONFIG_SPI_VERBOSE - Define to enable verbose SSP debug
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*/
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#ifdef CONFIG_SPI_DEBUG
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# define sspdbg lldbg
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# ifdef CONFIG_SPI_VERBOSE
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# define sspvdbg lldbg
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# else
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# define sspvdbg(x...)
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# endif
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#else
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# undef CONFIG_SPI_VERBOSE
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# define sspdbg(x...)
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# define sspvdbg(x...)
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#endif
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/************************************************************************************
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* Private Functions
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************************************************************************************/
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/************************************************************************************
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* Public Functions
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************************************************************************************/
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/************************************************************************************
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* Name: at90usb_spiinitialize
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*
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* Description:
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* Called to configure SPI chip select GPIO pins for the LPC1766-STK.
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*
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************************************************************************************/
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void weak_function at90usb_spiinitialize(void)
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{
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/* The Teensy board has no dedicated SPI devices so we assume that SS is used
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* for chip select:
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*
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* "When the SPI is configured as a Master (MSTR in SPCR is set), the user
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* can determine the direction of the SS pin. If SS is configured as an
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* output, the pin is a general output pin which does not affect the SPI
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* system. ...
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*
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* "If SS is configured as an input, it must be held high to ensure Master
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* SPI operation. If the SS pin is driven low by peripheral circuitry when
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* the SPI is configured as a Master with the SS pin defined as an input,
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* the SPI system interprets this as another master selecting the SPI ...
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*/
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DDRB |= TEENSY_CS; /* B0 is an output */
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PORTB |= TEENSY_CS; /* Low de-selects */
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DDRB &= ~(TEENSY_CD | TEENSY_WP); /* B4 and B5 are inputs */
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PORTB |= (TEENSY_CD | TEENSY_WP); /* Pull high */
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}
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/************************************************************************************
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* Name: avr_spiselect and avr_spistatus
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*
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* Description:
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* The external functions, avr_spiselect and avr_spistatus must be provided by
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* board-specific logic. They are implementations of the select and status methods
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* of the SPI interface defined by struct spi_ops_s (see include/nuttx/spi.h). All
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* other methods (including up_spiinitialize()) are provided by common AVR 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 avr_sspinitialize() to configure SPI chip select pins.
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* 2. Provide avr_spiselect() and avr_spistatus() functions in your board-specific
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* logic. These functions will perform chip selection and status operations
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* in the way your board is configured.
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* 3. Add a calls to at90usb_spiinitialize() in your low level application
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* initialization logic
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* 4. The handle returned by up_spiinitialize() may then be used to bind the
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* SPI driver to higher level logic (e.g., calling mmcsd_spislotinitialize(),
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* for example, will bind the SPI driver to the SPI MMC/SD driver).
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*
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************************************************************************************/
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void avr_spiselect(FAR struct spi_dev_s *dev, enum spi_dev_e devid, bool selected)
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{
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sspdbg("devid: %d CS: %s\n", (int)devid, selected ? "assert" : "de-assert");
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/* Assert/de-assert the CS pin to the card */
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if (selected)
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{
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PORTB &= ~TEENSY_CS;
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}
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else
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{
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PORTB |= TEENSY_CS;
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}
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}
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uint8_t avr_spistatus(FAR struct spi_dev_s *dev, enum spi_dev_e devid)
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{
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uint8_t ret = 0;
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uint8_t regval = PINB;
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/* Both the CD and WP pins are pull high by the AT90USB and will be
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* grounded it a card is inserted or write protected.
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*/
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if ((regval & TEENSY_CD) == 0)
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{
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ret |= SPI_STATUS_PRESENT;
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}
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if ((regval & TEENSY_WP) == 0)
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{
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ret |= SPI_STATUS_WRPROTECTED;
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}
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sspdbg("Returning %02x\n", ret);
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return ret;
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}
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#endif /* CONFIG_AVR_SPI */
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