259 lines
9.4 KiB
C
259 lines
9.4 KiB
C
/**************************************************************************//**
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* @file
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* @brief EBI implementation of Board Control interface
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* This implementation works for devices w/o LCD display on the
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* MCU module, specifically the EFM32_G2xx_DK development board
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* @author Energy Micro AS
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* @version 2.0.1
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******************************************************************************
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* @section License
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* <b>(C) Copyright 2012 Energy Micro AS, http://www.energymicro.com</b>
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*******************************************************************************
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*
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* Permission is granted to anyone to use this software for any purpose,
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* including commercial applications, and to alter it and redistribute it
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* freely, subject to the following restrictions:
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*
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* 1. The origin of this software must not be misrepresented; you must not
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* claim that you wrote the original software.
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* 2. Altered source versions must be plainly marked as such, and must not be
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* misrepresented as being the original software.
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* 3. This notice may not be removed or altered from any source distribution.
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* 4. The source and compiled code may only be used on Energy Micro "EFM32"
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* microcontrollers and "EFR4" radios.
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*
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* DISCLAIMER OF WARRANTY/LIMITATION OF REMEDIES: Energy Micro AS has no
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* obligation to support this Software. Energy Micro AS is providing the
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* Software "AS IS", with no express or implied warranties of any kind,
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* including, but not limited to, any implied warranties of merchantability
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* or fitness for any particular purpose or warranties against infringement
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* of any proprietary rights of a third party.
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*
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* Energy Micro AS will not be liable for any consequential, incidental, or
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* special damages, or any other relief, or for any claim by any third party,
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* arising from your use of this Software.
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*
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*****************************************************************************/
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#include "efm32.h"
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#include "em_ebi.h"
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#include "em_cmu.h"
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#include "em_gpio.h"
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#include "dvk.h"
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#include "dvk_bcregisters.h"
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/***************************************************************************//**
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* @addtogroup BSP
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* @{
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******************************************************************************/
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#if defined(EBI_PRESENT)
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/**************************************************************************//**
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* @brief Configure EBI (external bus interface) for Board Control register
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* access
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*****************************************************************************/
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void DVK_EBI_configure(void)
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{
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EBI_Init_TypeDef ebiConfig = EBI_INIT_DEFAULT;
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/* Run time check if we have EBI on-chip capability on this device */
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switch ((DEVINFO->PART & _DEVINFO_PART_DEVICE_NUMBER_MASK) >>
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_DEVINFO_PART_DEVICE_NUMBER_SHIFT)
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{
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/* Only device types EFM32G 280/290/880 and 890 have EBI capability */
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case 280:
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case 290:
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case 880:
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case 890:
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break;
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default:
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/* This device do not have EBI capability - use SPI to interface DVK */
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/* With high probability your project has been configured for an */
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/* incorrect part number. */
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while (1) ;
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}
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/* Enable clocks */
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CMU_ClockEnable(cmuClock_EBI, true);
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CMU_ClockEnable(cmuClock_GPIO, true);
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/* Configure mode - disable SPI, enable EBI */
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GPIO_PinModeSet(gpioPortC, 13, gpioModePushPull, 1);
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GPIO_PinModeSet(gpioPortC, 12, gpioModePushPull, 0);
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/* Configure GPIO pins as push pull */
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/* EBI AD9..15 */
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GPIO_PinModeSet(gpioPortA, 0, gpioModePushPull, 0);
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GPIO_PinModeSet(gpioPortA, 1, gpioModePushPull, 0);
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GPIO_PinModeSet(gpioPortA, 2, gpioModePushPull, 0);
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GPIO_PinModeSet(gpioPortA, 3, gpioModePushPull, 0);
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GPIO_PinModeSet(gpioPortA, 4, gpioModePushPull, 0);
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GPIO_PinModeSet(gpioPortA, 5, gpioModePushPull, 0);
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GPIO_PinModeSet(gpioPortA, 6, gpioModePushPull, 0);
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/* EBI AD8 */
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GPIO_PinModeSet(gpioPortA, 15, gpioModePushPull, 0);
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/* EBI CS0-CS3 */
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GPIO_PinModeSet(gpioPortD, 9, gpioModePushPull, 0);
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GPIO_PinModeSet(gpioPortD, 10, gpioModePushPull, 0);
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GPIO_PinModeSet(gpioPortD, 11, gpioModePushPull, 0);
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GPIO_PinModeSet(gpioPortD, 12, gpioModePushPull, 0);
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/* EBI AD0..7 */
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GPIO_PinModeSet(gpioPortE, 8, gpioModePushPull, 0);
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GPIO_PinModeSet(gpioPortE, 9, gpioModePushPull, 0);
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GPIO_PinModeSet(gpioPortE, 10, gpioModePushPull, 0);
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GPIO_PinModeSet(gpioPortE, 11, gpioModePushPull, 0);
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GPIO_PinModeSet(gpioPortE, 12, gpioModePushPull, 0);
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GPIO_PinModeSet(gpioPortE, 13, gpioModePushPull, 0);
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GPIO_PinModeSet(gpioPortE, 14, gpioModePushPull, 0);
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GPIO_PinModeSet(gpioPortE, 15, gpioModePushPull, 0);
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/* EBI ARDY/ALEN/Wen/Ren */
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GPIO_PinModeSet(gpioPortF, 2, gpioModePushPull, 0);
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GPIO_PinModeSet(gpioPortF, 3, gpioModePushPull, 0);
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GPIO_PinModeSet(gpioPortF, 4, gpioModePushPull, 0);
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GPIO_PinModeSet(gpioPortF, 5, gpioModePushPull, 0);
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/* Configure EBI controller, changing default values */
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ebiConfig.mode = ebiModeD16A16ALE;
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/* Enable bank 0 address map 0x80000000, FPGA Flash */
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/* Enable bank 1 address map 0x84000000, FPGA SRAM */
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/* Enable bank 2 address map 0x88000000, FPGA TFT Display (SSD2119) */
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/* Enable bank 3 address map 0x8c000000, FPGA Board Control Registers */
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ebiConfig.banks = EBI_BANK0|EBI_BANK1|EBI_BANK2|EBI_BANK3;
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ebiConfig.csLines = EBI_CS0|EBI_CS1|EBI_CS2|EBI_CS3;
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/* Address Setup and hold time */
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ebiConfig.addrHoldCycles = 3;
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ebiConfig.addrSetupCycles = 3;
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/* Read cycle times */
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ebiConfig.readStrobeCycles = 7;
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ebiConfig.readHoldCycles = 3;
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ebiConfig.readSetupCycles = 3;
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/* Write cycle times */
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ebiConfig.writeStrobeCycles = 7;
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ebiConfig.writeHoldCycles = 3;
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ebiConfig.writeSetupCycles = 3;
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/* Polarity values are default */
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/* Configure EBI */
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EBI_Init(&ebiConfig);
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}
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/**************************************************************************//**
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* @brief Initialize EBI
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* access
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* @return true on success, false on failure
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*****************************************************************************/
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bool DVK_EBI_init(void)
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{
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uint16_t ebiMagic;
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int retry = 10;
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/* Disable all GPIO pins and register */
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DVK_EBI_disable();
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/* Configure EBI */
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DVK_EBI_configure();
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/* Verify that EBI access is working, if not kit is in SPI mode and needs to
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* be configured for EBI access */
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ebiMagic = DVK_EBI_readRegister(BC_MAGIC);
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while ((ebiMagic != BC_MAGIC_VALUE) && retry)
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{
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DVK_EBI_disable();
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/* Enable SPI interface */
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DVK_SPI_init();
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/* Set EBI mode - after this SPI access will no longer be available */
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ebiMagic = DVK_SPI_readRegister(BC_MAGIC);
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DVK_SPI_writeRegister(BC_CFG, BC_CFG_EBI);
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/* Disable SPI */
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DVK_SPI_disable();
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/* Now setup EBI again */
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DVK_EBI_configure();
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/* Wait until ready */
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ebiMagic = DVK_EBI_readRegister(BC_MAGIC);
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if (ebiMagic == BC_MAGIC_VALUE) break;
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retry--;
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}
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if ( ! retry ) return false;
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DVK_EBI_writeRegister(BC_LED, retry);
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return true;
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}
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/**************************************************************************//**
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* @brief Disable EBI interface, free all GPIO pins
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*****************************************************************************/
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void DVK_EBI_disable(void)
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{
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/* Disable EBI and SPI _BC_BUS_CONNECT */
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GPIO_PinModeSet(gpioPortC, 12, gpioModeDisabled, 0);
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GPIO_PinModeSet(gpioPortC, 13, gpioModeDisabled, 0);
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/* Configure GPIO pins as disabled */
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GPIO_PinModeSet(gpioPortA, 0, gpioModeDisabled, 0);
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GPIO_PinModeSet(gpioPortA, 1, gpioModeDisabled, 0);
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GPIO_PinModeSet(gpioPortA, 2, gpioModeDisabled, 0);
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GPIO_PinModeSet(gpioPortA, 3, gpioModeDisabled, 0);
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GPIO_PinModeSet(gpioPortA, 4, gpioModeDisabled, 0);
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GPIO_PinModeSet(gpioPortA, 5, gpioModeDisabled, 0);
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GPIO_PinModeSet(gpioPortA, 6, gpioModeDisabled, 0);
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GPIO_PinModeSet(gpioPortA, 15, gpioModeDisabled, 0);
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GPIO_PinModeSet(gpioPortD, 9, gpioModeDisabled, 0);
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GPIO_PinModeSet(gpioPortD, 10, gpioModeDisabled, 0);
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GPIO_PinModeSet(gpioPortD, 11, gpioModeDisabled, 0);
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GPIO_PinModeSet(gpioPortD, 12, gpioModeDisabled, 0);
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GPIO_PinModeSet(gpioPortE, 8, gpioModeDisabled, 0);
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GPIO_PinModeSet(gpioPortE, 9, gpioModeDisabled, 0);
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GPIO_PinModeSet(gpioPortE, 10, gpioModeDisabled, 0);
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GPIO_PinModeSet(gpioPortE, 11, gpioModeDisabled, 0);
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GPIO_PinModeSet(gpioPortE, 12, gpioModeDisabled, 0);
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GPIO_PinModeSet(gpioPortE, 13, gpioModeDisabled, 0);
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GPIO_PinModeSet(gpioPortE, 14, gpioModeDisabled, 0);
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GPIO_PinModeSet(gpioPortE, 15, gpioModeDisabled, 0);
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GPIO_PinModeSet(gpioPortF, 2, gpioModeDisabled, 0);
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GPIO_PinModeSet(gpioPortF, 3, gpioModeDisabled, 0);
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GPIO_PinModeSet(gpioPortF, 4, gpioModeDisabled, 0);
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GPIO_PinModeSet(gpioPortF, 5, gpioModeDisabled, 0);
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/* Disable EBI controller */
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#if 0
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EBI_Disable();
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#endif
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/* Disable EBI clock in CMU */
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CMU_ClockEnable(cmuClock_EBI, false);
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}
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/**************************************************************************//**
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* @brief Write data into 16-bit board control register
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* @param addr Address to board control register
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* @param data Data to write into register
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*****************************************************************************/
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void DVK_EBI_writeRegister(volatile uint16_t *addr, uint16_t data)
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{
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*addr = data;
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}
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/**************************************************************************//**
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* @brief Write data into 16-bit board control register
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* @param addr Register to read from
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*****************************************************************************/
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uint16_t DVK_EBI_readRegister(volatile uint16_t *addr)
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{
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return *addr;
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}
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#endif
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/** @} (end group BSP) */
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