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//*****************************************************************************
//
// HAL_EK_TM4C1294XL_Crystalfontz128x128_ST7735.c -
//           Hardware abstraction layer for using the Educational Boosterpack's
//           Crystalfontz128x128 LCD with EK-TM4C1294XL LaunchPad
//
// Ported by Gene Bogdanov 8/30/2017
//
//*****************************************************************************


#include <stdint.h>
#include <stdbool.h>
#include "HAL_EK_TM4C1294XL_Crystalfontz128x128_ST7735.h"
#include "grlib/grlib.h"
#include "inc/hw_memmap.h"
#include "driverlib/gpio.h"
#include "driverlib/ssi.h"
#include "driverlib/sysctl.h"
#include "driverlib/pin_map.h"

void HAL_LCD_PortInit(void)
{
    // LCD_SCK
    SysCtlPeripheralEnable(LCD_SCK_PERIPH);
    GPIOPinTypeSSI(LCD_SCK_BASE, LCD_SCK_PIN);
    GPIOPinConfigure(LCD_SCK_CONFIG);

    // LCD_MOSI
    SysCtlPeripheralEnable(LCD_MOSI_PERIPH);
    GPIOPinTypeSSI(LCD_MOSI_BASE, LCD_MOSI_PIN);
    GPIOPinConfigure(LCD_MOSI_CONFIG);

    // LCD_RST
    SysCtlPeripheralEnable(LCD_RST_PERIPH);
    GPIOPinTypeGPIOOutput(LCD_RST_BASE, LCD_RST_PIN);

    // LCD_RS (DC)
    SysCtlPeripheralEnable(LCD_DC_PERIPH);
    GPIOPinTypeGPIOOutput(LCD_DC_BASE, LCD_DC_PIN);

    // LCD_CS
    SysCtlPeripheralEnable(LCD_CS_PERIPH);
    GPIOPinTypeGPIOOutput(LCD_CS_BASE, LCD_CS_PIN);
}

void HAL_LCD_SpiInit(void)
{
    // configure SSI as SPI
    SysCtlPeripheralEnable(LCD_SSI_PERIPH);
    SSIConfigSetExpClk(LCD_SSI_BASE, LCD_SYSTEM_CLOCK, LCD_SSI_PROTOCOL, SSI_MODE_MASTER, LCD_SSI_CLOCK, LCD_SSI_DATA_WIDTH);
    SSIEnable(LCD_SSI_BASE);

    // set outputs to default state
    GPIOPinWrite(LCD_CS_BASE, LCD_CS_PIN, 0);
    GPIOPinWrite(LCD_DC_BASE, LCD_DC_PIN, LCD_DC_PIN);

    // activate reset
    GPIOPinWrite(LCD_RST_BASE, LCD_RST_PIN, 0);

    HAL_LCD_delay(20);

    // deactivate reset
    GPIOPinWrite(LCD_RST_BASE, LCD_RST_PIN, LCD_RST_PIN);

    // delay more than 120 ms after reset
    HAL_LCD_delay(120000);
}


//*****************************************************************************
//
// Writes a command to the CFAF128128B-0145T.  This function implements the basic SPI
// interface to the LCD display.
//
//*****************************************************************************
void HAL_LCD_writeCommand(uint8_t command)
{
    // Set to command mode
    while (SSIBusy(LCD_SSI_BASE)); // finish any transmission
    GPIOPinWrite(LCD_DC_BASE, LCD_DC_PIN, 0);

    // Transmit data
    SSIDataPut(LCD_SSI_BASE, command);
    while (SSIBusy(LCD_SSI_BASE)); // finish transmission

    // Set back to data mode
    GPIOPinWrite(LCD_DC_BASE, LCD_DC_PIN, LCD_DC_PIN);
}


//*****************************************************************************
//
// Writes a data to the CFAF128128B-0145T.  This function implements the basic SPI
// interface to the LCD display.
//
//*****************************************************************************
void HAL_LCD_writeData(uint8_t data)
{
    // Transmit data
    SSIDataPut(LCD_SSI_BASE, data); // returns before data finishes transmitting
}