diff options
Diffstat (limited to 'nuttx/configs/teensy/src/up_spi.c')
| -rwxr-xr-x | nuttx/configs/teensy/src/up_spi.c | 202 |
1 files changed, 202 insertions, 0 deletions
diff --git a/nuttx/configs/teensy/src/up_spi.c b/nuttx/configs/teensy/src/up_spi.c new file mode 100755 index 000000000..8baacc05f --- /dev/null +++ b/nuttx/configs/teensy/src/up_spi.c @@ -0,0 +1,202 @@ +/************************************************************************************
+ * configs/teensy/src/up_spi.c
+ * arch/arm/src/board/up_spi.c
+ *
+ * Copyright (C) 2011 Gregory Nutt. All rights reserved.
+ * Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+ *
+ * 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 <nuttx/config.h>
+
+#include <stdint.h>
+#include <stdbool.h>
+#include <debug.h>
+
+#include <nuttx/spi.h>
+#include <arch/board/board.h>
+#include <avr/io.h>
+
+#include "up_arch.h"
+#include "chip.h"
+#include "at90Usb_internal.h"
+#include "teensy_internal.h"
+
+#ifdef CONFIG_AVR_SPI
+
+/************************************************************************************
+ * Definitions
+ ************************************************************************************/
+/* Teensy SPI Connection
+ *
+ * -- ---- -- ------------------------- -------
+ * J2 NAME PIN NAME PAD
+ * -- ---- -- ------------------------- -------
+ * 1 VIN -- Connected to USB +RV
+ * 2 GND -- Connected to USB GND
+ * 3 3V3 -- Not used ---
+ * 4 NC -- Not used
+ * 5 CS 10 (SS/PCINT0) PB0 Pad B0
+ * 6 DI 12 (PDI/PCINT2/MOSI) PB2 Pad B2
+ * 7 SCK 11 (PCINT1/SCLK) PB1 Pad B1
+ * 8 DO 13 (PDO/PCINT3/MISO) PB3 Pad B3
+ * 9 IRQ -- Not used ---
+ * 10 CD 14 (PCINT4/OC.2A) PB4 Pad B4
+ * 11 WP 15 (PCINT5/OC.1A) PB5 Pad B5
+ * -- ---- -- ------------------------- -------
+ */
+
+#define TEENSY_CS (1 << 0)
+#define TEENSY_CD (1 << 4)
+#define TEENSY_WP (1 << 5)
+
+/* The following enable debug output from this file (needs CONFIG_DEBUG too).
+ *
+ * CONFIG_SPI_DEBUG - Define to enable basic SSP debug
+ * CONFIG_SPI_VERBOSE - Define to enable verbose SSP debug
+ */
+
+#ifdef CONFIG_SPI_DEBUG
+# define sspdbg lldbg
+# ifdef CONFIG_SPI_VERBOSE
+# define sspvdbg lldbg
+# else
+# define sspvdbg(x...)
+# endif
+#else
+# undef CONFIG_SPI_VERBOSE
+# define sspdbg(x...)
+# define sspvdbg(x...)
+#endif
+
+/************************************************************************************
+ * Private Functions
+ ************************************************************************************/
+
+/************************************************************************************
+ * Public Functions
+ ************************************************************************************/
+
+/************************************************************************************
+ * Name: at90usb_spiinitialize
+ *
+ * Description:
+ * Called to configure SPI chip select GPIO pins for the LPC1766-STK.
+ *
+ ************************************************************************************/
+
+void weak_function at90usb_spiinitialize(void)
+{
+ /* The Teensy board has no dedicated SPI devices so we assume that SS is used
+ * for chip select:
+ *
+ * "When the SPI is configured as a Master (MSTR in SPCR is set), the user
+ * can determine the direction of the SS pin. If SS is configured as an
+ * output, the pin is a general output pin which does not affect the SPI
+ * system. ...
+ *
+ * "If SS is configured as an input, it must be held high to ensure Master
+ * SPI operation. If the SS pin is driven low by peripheral circuitry when
+ * the SPI is configured as a Master with the SS pin defined as an input,
+ * the SPI system interprets this as another master selecting the SPI ...
+ */
+
+ DDRB |= TEENSY_CS; /* B0 is an output */
+ PORTB |= TEENSY_CS; /* Low de-selects */
+ DDRB &= ~(TEENSY_CD | TEENSY_WP); /* B4 and B5 are inputs */
+ PORTB |= (TEENSY_CD | TEENSY_WP); /* Pull high */
+}
+
+/************************************************************************************
+ * Name: avr_spiselect and avr_spistatus
+ *
+ * Description:
+ * The external functions, avr_spiselect and avr_spistatus 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.h). All
+ * other methods (including up_spiinitialize()) are provided by common AVR logic.
+ * To use this common SPI logic on your board:
+ *
+ * 1. Provide logic in avr_sspinitialize() to configure SPI chip select pins.
+ * 2. Provide avr_spiselect() and avr_spistatus() functions in your board-specific
+ * logic. These functions will perform chip selection and status operations
+ * in the way your board is configured.
+ * 3. Add a calls to at90usb_spiinitialize() in your low level application
+ * initialization logic
+ * 4. The handle returned by up_spiinitialize() 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).
+ *
+ ************************************************************************************/
+
+void avr_spiselect(FAR struct spi_dev_s *dev, enum spi_dev_e devid, bool selected)
+{
+ sspdbg("devid: %d CS: %s\n", (int)devid, selected ? "assert" : "de-assert");
+
+ /* Assert/de-assert the CS pin to the card */
+
+ if (selected)
+ {
+ PORTB &= ~TEENSY_CS;
+ }
+ else
+ {
+ PORTB |= TEENSY_CS;
+ }
+}
+
+uint8_t avr_spistatus(FAR struct spi_dev_s *dev, enum spi_dev_e devid)
+{
+ uint8_t ret = 0;
+ uint8_t regval = PORTB;
+
+ /* Both the CD and WP pins are pull high by the AT90USB and will be
+ * grounded it a card is inserted or write protected.
+ */
+
+ if ((regval & TEENSY_CD) == 0)
+ {
+ ret |= SPI_STATUS_PRESENT;
+ }
+
+ if ((regval & TEENSY_WP) == 0)
+ {
+ ret |= SPI_STATUS_WRPROTECTED;
+ }
+
+ sspdbg("Returning %02x\n", ret);
+ return ret;
+}
+
+#endif /* CONFIG_AVR_SPI */
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