/************************************************************************************
* configs/stm3210e-eval/src/up_selectsram.c
* arch/arm/src/board/up_selectsram.c
*
* Copyright (C) 2009, 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 <debug.h>
#include "chip.h"
#include "up_arch.h"
#include "stm32.h"
#include "stm3210e-internal.h"
#ifdef CONFIG_STM32_FSMC
/************************************************************************************
* Pre-processor Definitions
************************************************************************************/
#if STM32_NGPIO_PORTS < 6
# error "Required GPIO ports not enabled"
#endif
/************************************************************************************
* Public Data
************************************************************************************/
/************************************************************************************
* Private Data
************************************************************************************/
/* 512Kx16 SRAM is connected to bank2 of the FSMC interface and both 8- and 16-bit
* accesses are allowed by BLN0 and BLN1 connected to BLE and BHE of SRAM,
* respectively.
*
* Pin Usage (per schematic)
* FLASH SRAM NAND LCD
* D[0..15] [0..15] [0..15] [0..7] [0..15]
* A[0..23] [0..22] [0..18] [16,17] [0]
* FSMC_NBL0 PE0 OUT ~BLE --- --- ---
* FSMC_NBL1 PE1 OUT ~BHE --- --- ---
* FSMC_NE2 PG9 OUT --- ~E --- ---
* FSMC_NE3 PG10 OUT ~CE --- --- ---
* FSMC_NE4 PG12 OUT --- --- --- ~CS
* FSMC_NWE PD5 OUT ~WE ~W ~W ~WR/SCL
* FSMC_NOE PD4 OUT ~OE ~G ~R ~RD
* FSMC_NWAIT PD6 IN --- R~B --- ---
* FSMC_INT2 PG6* IN --- --- R~B ---
*
* *JP7 will switch to PD6
*/
/* GPIO configurations unique to SRAM */
static const uint16_t g_sramconfig[] =
{
/* NE3, NBL0, NBL1, */
GPIO_NPS_NE3, GPIO_NPS_NBL0, GPIO_NPS_NBL1
};
#define NSRAM_CONFIG (sizeof(g_sramconfig)/sizeof(uint16_t))
/************************************************************************************
* Private Functions
************************************************************************************/
/************************************************************************************
* Public Functions
************************************************************************************/
/************************************************************************************
* Name: stm32_selectsram
*
* Description:
* Initialize to access external SRAM
*
************************************************************************************/
void stm32_selectsram(void)
{
/* Configure new GPIO state */
stm32_extmemgpios(g_commonconfig, NCOMMON_CONFIG);
stm32_extmemgpios(g_sramconfig, NSRAM_CONFIG);
/* Enable AHB clocking to the FSMC */
stm32_enablefsmc();
/* Bank1 NOR/SRAM control register configuration */
putreg32(FSMC_BCR_MWID16|FSMC_BCR_WREN, STM32_FSMC_BCR3);
/* Bank1 NOR/SRAM timing register configuration */
putreg32(FSMC_BTR_ADDSET(1)|FSMC_BTR_ADDHLD(1)|FSMC_BTR_DATAST(3)|FSMC_BTR_BUSTRUN(1)|
FSMC_BTR_CLKDIV(1)|FSMC_BTR_DATLAT(2)|FSMC_BTR_ACCMODA, STM32_FSMC_BTR3);
putreg32(0xffffffff, STM32_FSMC_BWTR3);
/* Enable the bank */
putreg32(FSMC_BCR_MBKEN|FSMC_BCR_MWID16|FSMC_BCR_WREN, STM32_FSMC_BCR3);
}
#endif /* CONFIG_STM32_FSMC */
