You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
243 lines
8.8 KiB
243 lines
8.8 KiB
/************************************************************************************ |
|
* configs/sam3u-ek/src/up_spi.c |
|
* arch/arm/src/board/up_spi.c |
|
* |
|
* Copyright (C) 2009, 2011 Gregory Nutt. All rights reserved. |
|
* Author: Gregory Nutt <gnutt@nuttx.org> |
|
* |
|
* 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 <errno.h> |
|
|
|
#include <nuttx/spi.h> |
|
#include <arch/board/board.h> |
|
|
|
#include "up_arch.h" |
|
#include "chip.h" |
|
#include "sam3u_internal.h" |
|
#include "sam3uek_internal.h" |
|
|
|
#ifdef CONFIG_SAM3U_SPI |
|
|
|
/************************************************************************************ |
|
* Definitions |
|
************************************************************************************/ |
|
|
|
/* Enables debug output from this file (needs CONFIG_DEBUG too) */ |
|
|
|
#undef SPI_DEBUG /* Define to enable debug */ |
|
#undef SPI_VERBOSE /* Define to enable verbose debug */ |
|
|
|
#ifdef SPI_DEBUG |
|
# define spidbg lldbg |
|
# ifdef SPI_VERBOSE |
|
# define spivdbg lldbg |
|
# else |
|
# define spivdbg(x...) |
|
# endif |
|
#else |
|
# undef SPI_VERBOSE |
|
# define spidbg(x...) |
|
# define spivdbg(x...) |
|
#endif |
|
|
|
/************************************************************************************ |
|
* Private Functions |
|
************************************************************************************/ |
|
|
|
/************************************************************************************ |
|
* Public Functions |
|
************************************************************************************/ |
|
|
|
/************************************************************************************ |
|
* Name: sam3u_spiinitialize |
|
* |
|
* Description: |
|
* Called to configure SPI chip select GPIO pins for the SAM3U10E-EVAL board. |
|
* |
|
************************************************************************************/ |
|
|
|
void weak_function sam3u_spiinitialize(void) |
|
{ |
|
/* The ZigBee module connects used NPCS0. However, there is not yet any |
|
* ZigBee support. |
|
*/ |
|
|
|
/* The touchscreen connects using NPCS2 (PC14). */ |
|
|
|
#if defined(CONFIG_INPUT) && defined(CONFIG_INPUT_ADS7843E) |
|
sam3u_configgpio(GPIO_TSC_NPCS2); |
|
#endif |
|
} |
|
|
|
/**************************************************************************** |
|
* Name: sam3u_spicsnumber, sam3u_spiselect, sam3u_spistatus, and |
|
* sam3u_spicmddata |
|
* |
|
* Description: |
|
* These external functions must be provided by board-specific logic. They |
|
* include: |
|
* |
|
* o sam3u_spicsnumbe and sam3u_spiselect which are helper functions to |
|
* manage the board-specific aspects of the unique SAM3U chip select |
|
* architecture. |
|
* o sam3u_spistatus and sam3u_spicmddata: Implementations of the status |
|
* and cmddata methods of the SPI interface defined by struct spi_ops_ |
|
* (see include/nuttx/spi.h). All other methods including |
|
* up_spiinitialize()) are provided by common SAM3U logic. |
|
* |
|
* To use this common SPI logic on your board: |
|
* |
|
* 1. Provide logic in sam3u_boardinitialize() to configure SPI chip select |
|
* pins. |
|
* 2. Provide sam3u_spicsnumber(), sam3u_spiselect() and sam3u_spistatus() |
|
* functions in your board-specific logic. These functions will perform |
|
* chip selection and status operations using GPIOs in the way your board |
|
* is configured. |
|
* 2. If CONFIG_SPI_CMDDATA is defined in the NuttX configuration, provide |
|
* sam3u_spicmddata() functions in your board-specific logic. This |
|
* function will perform cmd/data selection operations using GPIOs in |
|
* the way your board is configured. |
|
* 3. Add a call to up_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). |
|
* |
|
****************************************************************************/ |
|
|
|
/**************************************************************************** |
|
* Name: sam3u_spicsnumber |
|
* |
|
* Description: |
|
* The SAM3U has 4 CS registers for controlling device features. This |
|
* function must be provided by board-specific code. Given a logical device |
|
* ID, this function returns a number from 0 to 3 that identifies one of |
|
* these SAM3U CS resources. |
|
* |
|
* Input Parameters: |
|
* devid - Identifies the (logical) device |
|
* |
|
* Returned Values: |
|
* On success, a CS number from 0 to 3 is returned; A negated errno may |
|
* be returned on a failure. |
|
* |
|
****************************************************************************/ |
|
|
|
int sam3u_spicsnumber(enum spi_dev_e devid) |
|
{ |
|
int cs = -EINVAL; |
|
|
|
#if defined(CONFIG_INPUT) && defined(CONFIG_INPUT_ADS7843E) |
|
if (devid == SPIDEV_TOUCHSCREEN) |
|
{ |
|
/* Assert the CS pin to the OLED display */ |
|
|
|
cs = 2; |
|
} |
|
#endif |
|
|
|
spidbg("devid: %d CS: %d\n", (int)devid, cs); |
|
return cs; |
|
} |
|
|
|
/**************************************************************************** |
|
* Name: sam3u_spiselect |
|
* |
|
* Description: |
|
* PIO chip select pins may be programmed by the board specific logic in |
|
* one of two different ways. First, the pins may be programmed as SPI |
|
* peripherals. In that case, the pins are completely controlled by the |
|
* SPI driver. This method still needs to be provided, but it may be only |
|
* a stub. |
|
* |
|
* An alternative way to program the PIO chip select pins is as a normal |
|
* GPIO output. In that case, the automatic control of the CS pins is |
|
* bypassed and this function must provide control of the chip select. |
|
* NOTE: In this case, the GPIO output pin does *not* have to be the |
|
* same as the NPCS pin normal associated with the chip select number. |
|
* |
|
* Input Parameters: |
|
* devid - Identifies the (logical) device |
|
* selected - TRUE:Select the device, FALSE:De-select the device |
|
* |
|
* Returned Values: |
|
* None |
|
* |
|
****************************************************************************/ |
|
|
|
void sam3u_spiselect(enum spi_dev_e devid, bool selected) |
|
{ |
|
/* The touchscreen chip select is implemented as a GPIO OUTPUT that must |
|
* be controlled by this function. This is because the ADS7843E driver |
|
* must be able to sample the device BUSY GPIO input between SPI transfers. |
|
* However, the AD7843E will tri-state the BUSY input whenever the chip |
|
* select is de-asserted. So the only option is to control the chip select |
|
* manually and hold it low throughout the SPI transfer. |
|
*/ |
|
|
|
#if defined(CONFIG_INPUT) && defined(CONFIG_INPUT_ADS7843E) |
|
if (devid == SPIDEV_TOUCHSCREEN) |
|
{ |
|
sam3u_gpiowrite(GPIO_TSC_NPCS2, !selected); |
|
} |
|
#endif |
|
} |
|
|
|
/**************************************************************************** |
|
* Name: sam3u_spistatus |
|
* |
|
* Description: |
|
* Return status information associated with the SPI device. |
|
* |
|
* Input Parameters: |
|
* devid - Identifies the (logical) device |
|
* |
|
* Returned Values: |
|
* Bit-encoded SPI status (see include/nuttx/spi.h. |
|
* |
|
****************************************************************************/ |
|
|
|
uint8_t sam3u_spistatus(FAR struct spi_dev_s *dev, enum spi_dev_e devid) |
|
{ |
|
return 0; |
|
} |
|
|
|
#endif /* CONFIG_SAM3U_SPI */
|
|
|