diff options
Diffstat (limited to 'nuttx/configs/stm3240g-eval/src/up_extmem.c')
-rw-r--r-- | nuttx/configs/stm3240g-eval/src/up_extmem.c | 188 |
1 files changed, 188 insertions, 0 deletions
diff --git a/nuttx/configs/stm3240g-eval/src/up_extmem.c b/nuttx/configs/stm3240g-eval/src/up_extmem.c new file mode 100644 index 000000000..a87c07741 --- /dev/null +++ b/nuttx/configs/stm3240g-eval/src/up_extmem.c @@ -0,0 +1,188 @@ +/************************************************************************************ + * configs/stm3240g-eval/src/up_extmem.c + * arch/arm/src/board/up_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_fsmc.h" +#include "stm32_gpio.h" +#include "stm32_internal.h" +#include "stm3240g-internal.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); +} + +/************************************************************************************ + * Name: stm32_enablefsmc + * + * Description: + * enable clocking to the FSMC module + * + ************************************************************************************/ + +void stm32_enablefsmc(void) +{ + uint32_t regval; + + /* Enable AHB clocking to the FSMC */ + + regval = getreg32( STM32_RCC_AHB3ENR); + regval |= RCC_AHB3ENR_FSMCEN; + putreg32(regval, STM32_RCC_AHB3ENR); +} + +/************************************************************************************ + * Name: stm32_disablefsmc + * + * Description: + * enable clocking to the FSMC module + * + ************************************************************************************/ + +void stm32_disablefsmc(void) +{ + uint32_t regval; + + /* Disable AHB clocking to the FSMC */ + + regval = getreg32(STM32_RCC_AHB3ENR); + regval &= ~RCC_AHB3ENR_FSMCEN; + putreg32(regval, STM32_RCC_AHB3ENR); +} |