/*****************************************************************************
* | File      	:   DEV_Config.c
* | Author      :   Waveshare team
* | Function    :   Hardware underlying interface
* | Info        :
*----------------
* |	This version:   V3.0
* | Date        :   2019-09-17
* | Info        :   
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documnetation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of theex Software, and to permit persons to  whom the Software is
# furished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS OR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
#
******************************************************************************/
#include "DEV_Config.h"
#include <fcntl.h>


/******************************************************************************
function:	GPIO Write
parameter:
Info:
******************************************************************************/
void DEV_Digital_Write(UWORD Pin, UBYTE Value)
{
	bcm2835_gpio_write(Pin, Value);
}

/******************************************************************************
function:	GPIO Read
parameter:
Info:
******************************************************************************/
UBYTE DEV_Digital_Read(UWORD Pin)
{
	UBYTE Read_Value = 0;
	Read_Value = bcm2835_gpio_lev(Pin);
	return Read_Value;
}

/******************************************************************************
function:	SPI Write
parameter:
Info:
******************************************************************************/
void DEV_SPI_WriteByte(UBYTE Value)
{
	bcm2835_spi_transfer(Value);
}

/******************************************************************************
function:	SPI Read
parameter:
Info:
******************************************************************************/
UBYTE DEV_SPI_ReadByte()
{
	UBYTE Read_Value = 0x00;
	Read_Value = bcm2835_spi_transfer(0x00);
	return Read_Value;
}

/******************************************************************************
function:	Time delay for ms
parameter:
Info:
******************************************************************************/
void DEV_Delay_ms(UDOUBLE xms)
{
	bcm2835_delay(xms);
}


/******************************************************************************
function:	Time delay for us
parameter:
Info:
******************************************************************************/
void DEV_Delay_us(UDOUBLE xus)
{
	bcm2835_delayMicroseconds(xus);
}






/**
 * GPIO Mode
**/
static void DEV_GPIO_Mode(UWORD Pin, UWORD Mode)
{
	if(Mode == 0 || Mode == BCM2835_GPIO_FSEL_INPT) {
		bcm2835_gpio_fsel(Pin, BCM2835_GPIO_FSEL_INPT);
	} else {
		bcm2835_gpio_fsel(Pin, BCM2835_GPIO_FSEL_OUTP);
	}
}


/**
 * GPIO Init
**/
static void DEV_GPIO_Init(void)
{
	DEV_GPIO_Mode(EPD_RST_PIN, BCM2835_GPIO_FSEL_OUTP);
	DEV_GPIO_Mode(EPD_CS_PIN, BCM2835_GPIO_FSEL_OUTP);
	DEV_GPIO_Mode(EPD_BUSY_PIN, BCM2835_GPIO_FSEL_INPT);

	DEV_Digital_Write(EPD_CS_PIN, HIGH);
}



/******************************************************************************
function:	Module Initialize, the library and initialize the pins, SPI protocol
parameter:
Info:
******************************************************************************/
UBYTE DEV_Module_Init(void)
{
    Debug("/***********************************/ \r\n");

	if(!bcm2835_init()) {
		Debug("bcm2835 init failed  !!! \r\n");
		return 1;
	} else {
		Debug("bcm2835 init success !!! \r\n");
	}

	bcm2835_spi_begin();                                         //Start spi interface, set spi pin for the reuse function
	bcm2835_spi_setBitOrder(BCM2835_SPI_BIT_ORDER_MSBFIRST);     //High first transmission
	bcm2835_spi_setDataMode(BCM2835_SPI_MODE0);                  //spi mode 0
	//bcm2835_spi_setClockDivider(BCM2835_SPI_CLOCK_DIVIDER_16);   //For RPi3/3B/3B+
	bcm2835_spi_setClockDivider(BCM2835_SPI_CLOCK_DIVIDER_32);   //For RPi 4
	/* SPI clock reference link：*/
	/*http://www.airspayce.com/mikem/bcm2835/group__constants.html#gaf2e0ca069b8caef24602a02e8a00884e*/

	//GPIO Config
	DEV_GPIO_Init();

    Debug("/***********************************/ \r\n");
	return 0;
}



/******************************************************************************
function:	Module exits, closes SPI and BCM2835 library
parameter:
Info:
******************************************************************************/
void DEV_Module_Exit(void)
{
	DEV_Digital_Write(EPD_CS_PIN, LOW);
	DEV_Digital_Write(EPD_RST_PIN, LOW);

	bcm2835_spi_end();
	bcm2835_close();
}