rt-thread-official/bsp/efm32/graphics/dmd/ssd2119/dmdif_ssd2119_spi.c

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/*************************************************************************//**
* @file dmdif_ssd2119_ebi.c
* @brief Dot matrix display SSD2119 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_spi.h"
#include "dvk.h"
/* Local function prototypes */
static EMSTATUS setNextReg(uint8_t reg);
static uint32_t command_register;
static uint32_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 = cmdRegAddr;
data_register = dataRegAddr;
DVK_displayControl(DVK_Display_SPI);
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);
/* Write bits [15:8] of the data to bits [8:1] of the output lines */
DVK_writeRegister( (uint16_t *) data_register, ((data & 0xff00) >> 8) << 1);
/* Write bits [7:0] of the data to bits [8:1] of the output lines */
DVK_writeRegister( (uint16_t *) data_register, (data & 0x00ff) << 1);
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 readData;
uint16_t deviceCode;
/* Reading from the oscillation control register gives the device code */
setNextReg(DMD_SSD2119_DEVICE_CODE_READ);
readData = DVK_readRegister( (uint16_t *) data_register );
deviceCode = ((readData >> 1) & 0x00ff) << 8;
readData = DVK_readRegister( (uint16_t *) data_register );
deviceCode |= ((readData >> 1) & 0x00ff);
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)
{
/* Write bits [17:9] of the pixel data to bits [8:0] on the output lines */
DVK_writeRegister( (uint16_t *) data_register, (data & 0x0003FE00) >> 9);
/* Write bits [8:0] of the pixel data to bits [8:0] on the output lines */
DVK_writeRegister( (uint16_t *) data_register, (data & 0x000001FF));
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;
/* Read bits [17:9] of the pixel */
data = DVK__readRegister( (uint16_t *) data_register ) << 9;
/* Read bits [8:0] of the pixel */
data |= DVK_readRegister( (uint16_t *) 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 = ((uint16_t) reg) << 1;
/* First 9 bits is 0 */
DVK_writeRegister( (uint16_t *) command_register, 0 );
/* Write the register address to bits [8:1] in the index register */
DVK_writeRegister( (uint16_t *) command_register, data );
return DMD_OK;
}