203 lines
7.6 KiB
C
203 lines
7.6 KiB
C
/************************************************************************************
|
|
* configs/mirtoo/src/pic32_spi2.c
|
|
*
|
|
* Copyright (C) 2012 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 <nuttx/spi/spi.h>
|
|
#include <arch/board/board.h>
|
|
|
|
#include "up_arch.h"
|
|
#include "chip.h"
|
|
#include "pic32mx-internal.h"
|
|
#include "pic32mx-pps.h"
|
|
#include "mirtoo-internal.h"
|
|
|
|
#ifdef CONFIG_PIC32MX_SPI2
|
|
|
|
/************************************************************************************
|
|
* Pre-processor Definitions
|
|
************************************************************************************/
|
|
|
|
/* The Mirtoo module as two on-board SPI devices:
|
|
*
|
|
* SST25VF032B - 32-Mbit SPI Serial FLASH
|
|
*
|
|
* PGA117 - Zero drift programmable gain amplifier with MUX. The PGA117 offers 10
|
|
* analog inputs, a four-pin SPI interface with daisy-chain capability, and hardware
|
|
* and software shutdown in a TSSOP-20 package. Only 8 of the analog inputs (PORT0-7)
|
|
* are used on the Mirtoo module.
|
|
*
|
|
* Chip selects:
|
|
*
|
|
* ------ -------- ------------------------- --------------------------------
|
|
* PIN SIGNAL BOARD CONNECTION NOTES
|
|
* ------ -------- ------------------------- --------------------------------
|
|
* RPA1 SI PGA117 and SST25VF032B SPI2 data OUT (SDO2)
|
|
* RPA2 SO PGA117 and SST25VF032B R1, SPI2 data IN (SDI2)
|
|
* RPA3 SO PGA117 and SST25VF032B R0, SPI2 data IN (SDI2)
|
|
* SCK2 SCK PGA117 and SST25VF032B SPI2 clock
|
|
*
|
|
* RB7 ~CSAI PGA117 PGA117 chip select (active low)
|
|
* RB13 ~CSM SST25VF032B SST25VF032B chip select (active low)
|
|
*/
|
|
|
|
#define GPIO_SI (GPIO_OUTPUT|GPIO_PORTA|GPIO_PIN1)
|
|
#if CONFIG_MIRTOO_RELEASE == 1
|
|
# define GPIO_SO (GPIO_INPUT|GPIO_PORTA|GPIO_PIN2)
|
|
#else
|
|
# define GPIO_SO (GPIO_INPUT|GPIO_PORTA|GPIO_PIN3)
|
|
#endif
|
|
#define GPIO_SCK (GPIO_OUTPUT|GPIO_PORTB|GPIO_PIN15)
|
|
|
|
#define GPIO_PGA117_CS (GPIO_OUTPUT|GPIO_VALUE_ONE|GPIO_PORTB|GPIO_PIN7)
|
|
#define GPIO_SST25VF032B_CS (GPIO_OUTPUT|GPIO_VALUE_ONE|GPIO_PORTB|GPIO_PIN13)
|
|
|
|
/* The following enable debug output from this file (needs CONFIG_DEBUG too).
|
|
*
|
|
* CONFIG_DEBUG_SPI - Define to enable basic SPI debug
|
|
*/
|
|
|
|
#ifdef CONFIG_DEBUG_SPI
|
|
# define spidbg lldbg
|
|
# define spivdbg llvdbg
|
|
#else
|
|
# define spidbg(x...)
|
|
# define spivdbg(x...)
|
|
#endif
|
|
|
|
/************************************************************************************
|
|
* Private Functions
|
|
************************************************************************************/
|
|
|
|
/************************************************************************************
|
|
* Public Functions
|
|
************************************************************************************/
|
|
|
|
/************************************************************************************
|
|
* Name: pic32mx_spi2initialize
|
|
*
|
|
* Description:
|
|
* Called to configure SPI2 chip select GPIO pins for the Mirtoo module.
|
|
*
|
|
************************************************************************************/
|
|
|
|
void weak_function pic32mx_spi2initialize(void)
|
|
{
|
|
/* Make sure that TRIS pins are set correctly. Configure the SPI pins as digital
|
|
* inputs and outputs first.
|
|
*/
|
|
|
|
pic32mx_configgpio(GPIO_SI);
|
|
pic32mx_configgpio(GPIO_SO);
|
|
pic32mx_configgpio(GPIO_SCK);
|
|
|
|
/* Configure SPI2 data in and data out to use RPA2 and 1, respectively */
|
|
|
|
putreg32(PPS_INSEL_RPA2, PIC32MX_PPS_SDI2R);
|
|
putreg32(PPS_OUTSEL_SDO2, PIC32MX_PPS_RPA1R);
|
|
|
|
/* Configure the SPI chip select GPIOs */
|
|
|
|
pic32mx_configgpio(GPIO_PGA117_CS);
|
|
pic32mx_configgpio(GPIO_SST25VF032B_CS);
|
|
}
|
|
|
|
/************************************************************************************
|
|
* Name: pic32mx_spi2select, pic32mx_spi2status, and pic32mx_spi2cmddata
|
|
*
|
|
* Description:
|
|
* These external functions must be provided by board-specific logic. They are
|
|
* implementations of the select, status, and cmddata methods of the SPI interface
|
|
* defined by struct spi_ops_s (see include/nuttx/spi/spi.h). All other methods
|
|
* including up_spiinitialize()) are provided by common PIC32MX logic. To use
|
|
* this common SPI logic on your board:
|
|
*
|
|
* 1. Provide logic in pic32mx_boardinitialize() to configure SPI chip select
|
|
* pins.
|
|
* 2. Provide pic32mx_spiNselect() and pic32mx_spiNstatus() 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
|
|
* pic32mx_spiNcmddata() functions in your board-specific logic. These
|
|
* functions 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).
|
|
*
|
|
************************************************************************************/
|
|
|
|
struct spi_dev_s;
|
|
enum spi_dev_e;
|
|
|
|
void pic32mx_spi2select(FAR struct spi_dev_s *dev, enum spi_dev_e devid, bool selected)
|
|
{
|
|
spidbg("devid: %d CS: %s\n", (int)devid, selected ? "assert" : "de-assert");
|
|
|
|
if (devid == SPIDEV_FLASH)
|
|
{
|
|
pic32mx_gpiowrite(GPIO_SST25VF032B_CS, !selected);
|
|
}
|
|
else if (devid == SPIDEV_MUX)
|
|
{
|
|
pic32mx_gpiowrite(GPIO_PGA117_CS, !selected);
|
|
}
|
|
}
|
|
|
|
uint8_t pic32mx_spi2status(FAR struct spi_dev_s *dev, enum spi_dev_e devid)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_SPI_CMDDATA
|
|
int pic32mx_spi2cmddata(FAR struct spi_dev_s *dev, enum spi_dev_e devid, bool cmd)
|
|
{
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
#endif /* CONFIG_PIC32MX_SPI2 */
|