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/*************************************************************************//**
* @file dmdif_ssd2119_ebi.c
* @brief Dot matrix display interface using EBI
* @author Energy Micro AS
******************************************************************************
* @section License
* <b>(C) Copyright 2012 Energy Micro AS, http://www.energymicro.com</b>
******************************************************************************
*
* Permission is granted to anyone to use this software for any purpose,
* including commercial applications, and to alter it and redistribute it
* freely, subject to the following restrictions:
*
* 1. The origin of this software must not be misrepresented; you must not
* claim that you wrote the original software.
* 2. Altered source versions must be plainly marked as such, and must not be
* misrepresented as being the original software.
* 3. This notice may not be removed or altered from any source distribution.
* 4. The source and compiled code may only be used on Energy Micro "EFM32"
* microcontrollers and "EFR4" radios.
*
* DISCLAIMER OF WARRANTY/LIMITATION OF REMEDIES: Energy Micro AS has no
* obligation to support this Software. Energy Micro AS is providing the
* Software "AS IS", with no express or implied warranties of any kind,
* including, but not limited to, any implied warranties of merchantability
* or fitness for any particular purpose or warranties against infringement
* of any proprietary rights of a third party.
*
* Energy Micro AS will not be liable for any consequential, incidental, or
* special damages, or any other relief, or for any claim by any third party,
* arising from your use of this Software.
*
*****************************************************************************/
#include <stdint.h>
#include "dmd_ssd2119_registers.h"
#include "dmd_ssd2119.h"
#include "dmdif_ssd2119_ebi.h"
#include "dvk.h"
/* Local function prototypes */
static EMSTATUS setNextReg(uint8_t reg);
static volatile uint16_t *command_register;
static volatile uint16_t *data_register;
/**************************************************************************//**
* @brief
* Initializes the data interface to the LCD controller SSD2119
*
*
* @param cmdRegAddr
* The address in memory where data to the command register in the display
* controller are written
* @param dataRegAddr
* The address in memory where data to the data register in the display
* controller are written
*
* @return
* DMD_OK on success, otherwise error code
******************************************************************************/
EMSTATUS DMDIF_init(uint32_t cmdRegAddr, uint32_t dataRegAddr)
{
command_register = (volatile uint16_t*) cmdRegAddr;
data_register = (volatile uint16_t*) dataRegAddr;
return DMD_OK;
}
/**************************************************************************//**
* @brief
* Writes a value to a control register in the LCD controller
*
* @param reg
* The register that will be written to
* @param data
* The value to write to the register
*
* @return
* DMD_OK on success, otherwise error code
******************************************************************************/
EMSTATUS DMDIF_writeReg(uint8_t reg, uint16_t data)
{
setNextReg(reg);
*data_register = data;
return DMD_OK;
}
/**************************************************************************//**
* @brief
* Reads the device code of the LCD controller
* DOESN'T WORK
*
* @return
* The device code of the LCD controller
******************************************************************************/
uint16_t DMDIF_readDeviceCode(void)
{
uint16_t deviceCode;
/* Reading from the oscillation control register gives the device code */
setNextReg(DMD_SSD2119_DEVICE_CODE_READ);
deviceCode = *data_register;
return deviceCode;
}
/**************************************************************************//**
* @brief
* Sends the data access command to the LCD controller to prepare for one or more
* writes or reads using the DMDIF_writeData() and DMDIF_readData()
*
* @return
* DMD_OK on success, otherwise error code
******************************************************************************/
EMSTATUS DMDIF_prepareDataAccess(void)
{
setNextReg(DMD_SSD2119_ACCESS_DATA);
return DMD_OK;
}
/**************************************************************************//**
* @brief
* Writes one pixel to the LCD controller. DMDIF_prepareDataAccess() needs to be
* called before writing data using this function.
*
* @param data
* The color value of the pixel to be written in 18bpp format
*
* @return
* DMD_OK on success, otherwise error code
******************************************************************************/
EMSTATUS DMDIF_writeData(uint32_t data)
{
*data_register = (data & 0x0000FFFF);
return DMD_OK;
}
/**************************************************************************//**
* @brief
* Writes one pixel to the LCD controller. DMDIF_prepareDataAccess() needs to be
* called before writing data using this function.
*
* @param data
* The color value of the pixel to be written in 18bpp format
*
* @return
* DMD_OK on success, otherwise error code
******************************************************************************/
EMSTATUS DMDIF_writeDataRepeated( uint32_t data, int len ){
uint16_t pixelData;
int i;
/* Write bits [8:0] of the pixel data to bits [8:0] on the output lines */
pixelData = data & 0x0000FFFF;
for (i=0; i<len; i++) {
*data_register = pixelData;
}
return DMD_OK;
}
/**************************************************************************//**
* @brief
* Writes one pixel to the LCD controller. DMDIF_prepareDataAccess() needs to be
* called before writing data using this function.
*
* @param a
* The upper 9 bits of color value of the pixel to be written in 18bpp format
*
* @param b
* The low 9 bits of color value of the pixel to be written in 18bpp format
*
* @return
* DMD_OK on success, otherwise error code
******************************************************************************/
EMSTATUS DMDIF_writeDataConverted( uint16_t a, uint16_t b ){
uint16_t pixel;
pixel = b >> 1;
pixel |= (a << 8) & 0xFF00;
*data_register = pixel;
return DMD_OK;
}
/**************************************************************************//**
* @brief
* Reads a byte of data from the memory of the LCD controller.
* DMDIF_prepareDataAccess() needs to be called before using this function.
* DOESN'T WORK
*
* @return
* 18bpp value of pixel
******************************************************************************/
uint32_t DMDIF_readData(void)
{
uint32_t data;
data = *data_register;
return data;
}
/**************************************************************************//**
* \brief
* Sets the register in the LCD controller to write commands to
*
* \param reg
* The next register in the LCD controller to write to
*
* @return
* DMD_OK on success, otherwise error code
******************************************************************************/
static EMSTATUS setNextReg(uint8_t reg)
{
uint16_t data;
data = reg & 0xff;
/* Write the register address to bits [8:1] in the index register */
*command_register = data;
return DMD_OK;
}
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