nuttx/configs/stm32f4discovery/src/stm32_extmem.c

148 lines
5.3 KiB
C

/************************************************************************************
* configs/stm32f4disovery/src/stm32_extmem.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 <assert.h>
#include <debug.h>
#include <arch/board/board.h>
#include "chip.h"
#include "up_arch.h"
#include "stm32.h"
#include "stm32f4discovery.h"
/************************************************************************************
* Pre-processor Definitions
************************************************************************************/
#ifndef CONFIG_STM32_FSMC
# warning "FSMC is not enabled"
#endif
#if STM32_NGPIO_PORTS < 6
# error "Required GPIO ports not enabled"
#endif
#define STM32_FSMC_NADDRCONFIGS 26
#define STM32_FSMC_NDATACONFIGS 16
/************************************************************************************
* Public Data
************************************************************************************/
/* GPIO configurations common to most external memories */
static const uint32_t g_addressconfig[STM32_FSMC_NADDRCONFIGS] =
{
GPIO_FSMC_A0, GPIO_FSMC_A1 , GPIO_FSMC_A2, GPIO_FSMC_A3, GPIO_FSMC_A4 , GPIO_FSMC_A5,
GPIO_FSMC_A6, GPIO_FSMC_A7, GPIO_FSMC_A8, GPIO_FSMC_A9, GPIO_FSMC_A10, GPIO_FSMC_A11,
GPIO_FSMC_A12, GPIO_FSMC_A13, GPIO_FSMC_A14, GPIO_FSMC_A15, GPIO_FSMC_A16, GPIO_FSMC_A17,
GPIO_FSMC_A18, GPIO_FSMC_A19, GPIO_FSMC_A20, GPIO_FSMC_A21, GPIO_FSMC_A22, GPIO_FSMC_A23,
GPIO_FSMC_A24, GPIO_FSMC_A25
};
static const uint32_t g_dataconfig[STM32_FSMC_NDATACONFIGS] =
{
GPIO_FSMC_D0, GPIO_FSMC_D1 , GPIO_FSMC_D2, GPIO_FSMC_D3, GPIO_FSMC_D4 , GPIO_FSMC_D5,
GPIO_FSMC_D6, GPIO_FSMC_D7, GPIO_FSMC_D8, GPIO_FSMC_D9, GPIO_FSMC_D10, GPIO_FSMC_D11,
GPIO_FSMC_D12, GPIO_FSMC_D13, GPIO_FSMC_D14, GPIO_FSMC_D15
};
/************************************************************************************
* Private Data
************************************************************************************/
/************************************************************************************
* Private Functions
************************************************************************************/
/************************************************************************************
* Public Functions
************************************************************************************/
/************************************************************************************
* Name: stm32_extmemgpios
*
* Description:
* Initialize GPIOs for external memory usage
*
************************************************************************************/
void stm32_extmemgpios(const uint32_t *gpios, int ngpios)
{
int i;
/* Configure GPIOs */
for (i = 0; i < ngpios; i++)
{
stm32_configgpio(gpios[i]);
}
}
/************************************************************************************
* Name: stm32_extmemaddr
*
* Description:
* Initialize adress line GPIOs for external memory access
*
************************************************************************************/
void stm32_extmemaddr(int naddrs)
{
stm32_extmemgpios(g_addressconfig, naddrs);
}
/************************************************************************************
* Name: stm32_extmemdata
*
* Description:
* Initialize data line GPIOs for external memory access
*
************************************************************************************/
void stm32_extmemdata(int ndata)
{
stm32_extmemgpios(g_dataconfig, ndata);
}