/nuttx/configs/stm3210e-eval/src/up_selectsram.c
C | 145 lines | 28 code | 31 blank | 86 comment | 0 complexity | a47397e9a8ebe63bf0ef2d53ec76214b MD5 | raw file
- /************************************************************************************
- * 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
- * D[0..15] [0..15] [0..15] [0..7]
- * A[0..23] [0..22] [0..18] [16,17]
- * PSMC_NE3 PG10 OUT ~CE --- ---
- * PSMC_NBL0 PE0 OUT ~BLE --- ---
- * PSMC_NBL1 PE1 OUT ~BHE --- ---
- * PSMC_NE2 PG9 OUT --- ~E ---
- * PSMC_NWE PD5 OUT ~WE ~W ~W
- * PSMC_NOE PD4 OUT ~OE ~G ~R
- * PSMC_NWAIT PD6 IN --- R~B ---
- * PSMC_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_BCR3);
- /* Enable the bank */
- putreg32(FSMC_BCR_MBKEN|FSMC_BCR_MWID16|FSMC_BCR_WREN, STM32_FSMC_BCR3);
- }
- #endif /* CONFIG_STM32_FSMC */