204 lines
6.8 KiB
C
204 lines
6.8 KiB
C
/*************************************************************************//**
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* @file dmdif_ssd2119_ebi.c
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* @brief Dot matrix display SSD2119 interface using EBI
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* @author Energy Micro AS
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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 <stdint.h>
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#include "dmd_ssd2119_registers.h"
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#include "dmd_ssd2119.h"
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#include "dmdif_ssd2119_spi.h"
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#include "dvk.h"
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/* Local function prototypes */
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static EMSTATUS setNextReg(uint8_t reg);
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static uint32_t command_register;
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static uint32_t data_register;
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/**************************************************************************//**
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* @brief
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* Initializes the data interface to the LCD controller SSD2119
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*
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*
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* @param cmdRegAddr
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* The address in memory where data to the command register in the display
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* controller are written
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* @param dataRegAddr
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* The address in memory where data to the data register in the display
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* controller are written
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*
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* @return
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* DMD_OK on success, otherwise error code
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******************************************************************************/
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EMSTATUS DMDIF_init(uint32_t cmdRegAddr, uint32_t dataRegAddr)
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{
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command_register = cmdRegAddr;
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data_register = dataRegAddr;
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DVK_displayControl(DVK_Display_SPI);
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return DMD_OK;
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}
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/**************************************************************************//**
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* @brief
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* Writes a value to a control register in the LCD controller
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*
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* @param reg
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* The register that will be written to
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* @param data
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* The value to write to the register
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*
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* @return
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* DMD_OK on success, otherwise error code
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******************************************************************************/
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EMSTATUS DMDIF_writeReg(uint8_t reg, uint16_t data)
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{
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setNextReg(reg);
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/* Write bits [15:8] of the data to bits [8:1] of the output lines */
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DVK_writeRegister( (uint16_t *) data_register, ((data & 0xff00) >> 8) << 1);
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/* Write bits [7:0] of the data to bits [8:1] of the output lines */
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DVK_writeRegister( (uint16_t *) data_register, (data & 0x00ff) << 1);
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return DMD_OK;
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}
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/**************************************************************************//**
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* @brief
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* Reads the device code of the LCD controller
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* DOESN'T WORK
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*
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* @return
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* The device code of the LCD controller
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******************************************************************************/
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uint16_t DMDIF_readDeviceCode(void)
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{
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uint16_t readData;
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uint16_t deviceCode;
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/* Reading from the oscillation control register gives the device code */
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setNextReg(DMD_SSD2119_DEVICE_CODE_READ);
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readData = DVK_readRegister( (uint16_t *) data_register );
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deviceCode = ((readData >> 1) & 0x00ff) << 8;
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readData = DVK_readRegister( (uint16_t *) data_register );
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deviceCode |= ((readData >> 1) & 0x00ff);
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return deviceCode;
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}
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/**************************************************************************//**
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* @brief
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* Sends the data access command to the LCD controller to prepare for one or more
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* writes or reads using the DMDIF_writeData() and DMDIF_readData()
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*
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* @return
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* DMD_OK on success, otherwise error code
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******************************************************************************/
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EMSTATUS DMDIF_prepareDataAccess(void)
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{
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setNextReg(DMD_SSD2119_ACCESS_DATA);
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return DMD_OK;
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}
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/**************************************************************************//**
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* @brief
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* Writes one pixel to the LCD controller. DMDIF_prepareDataAccess() needs to be
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* called before writing data using this function.
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*
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* @param data
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* The color value of the pixel to be written in 18bpp format
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*
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* @return
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* DMD_OK on success, otherwise error code
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******************************************************************************/
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EMSTATUS DMDIF_writeData(uint32_t data)
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{
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/* Write bits [17:9] of the pixel data to bits [8:0] on the output lines */
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DVK_writeRegister( (uint16_t *) data_register, (data & 0x0003FE00) >> 9);
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/* Write bits [8:0] of the pixel data to bits [8:0] on the output lines */
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DVK_writeRegister( (uint16_t *) data_register, (data & 0x000001FF));
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return DMD_OK;
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}
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/**************************************************************************//**
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* @brief
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* Reads a byte of data from the memory of the LCD controller.
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* DMDIF_prepareDataAccess() needs to be called before using this function.
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* DOESN'T WORK
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*
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* @return
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* 18bpp value of pixel
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******************************************************************************/
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uint32_t DMDIF_readData(void)
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{
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uint32_t data;
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/* Read bits [17:9] of the pixel */
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data = DVK__readRegister( (uint16_t *) data_register ) << 9;
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/* Read bits [8:0] of the pixel */
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data |= DVK_readRegister( (uint16_t *) data_register );
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return data;
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}
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/**************************************************************************//**
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* \brief
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* Sets the register in the LCD controller to write commands to
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*
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* \param reg
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* The next register in the LCD controller to write to
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*
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* @return
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* DMD_OK on success, otherwise error code
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******************************************************************************/
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static EMSTATUS setNextReg(uint8_t reg)
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{
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uint16_t data;
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data = ((uint16_t) reg) << 1;
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/* First 9 bits is 0 */
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DVK_writeRegister( (uint16_t *) command_register, 0 );
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/* Write the register address to bits [8:1] in the index register */
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DVK_writeRegister( (uint16_t *) command_register, data );
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return DMD_OK;
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}
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