/*****************************************************************************
* | File      	:   DEV_Config.c
* | Author      :   Waveshare team
* | Function    :   Hardware underlying interface
* | Info        :
*----------------
* |	This version:   V3.0
* | Date        :   2019-07-31
* | 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"

/**
 * GPIO
**/
int EPD_RST_PIN;
int EPD_DC_PIN;
int EPD_CS_PIN;
int EPD_BUSY_PIN;
int EPD_PWR_PIN;

/**
 * GPIO read and write
**/
void DEV_Digital_Write(UWORD Pin, UBYTE Value)
{
#ifdef RPI
#ifdef USE_BCM2835_LIB
	bcm2835_gpio_write(Pin, Value);
#elif USE_WIRINGPI_LIB
	digitalWrite(Pin, Value);
#elif USE_DEV_LIB
	SYSFS_GPIO_Write(Pin, Value);
#endif
#endif

#ifdef JETSON
#ifdef USE_DEV_LIB
	SYSFS_GPIO_Write(Pin, Value);
#elif USE_HARDWARE_LIB
	Debug("not support");
#endif
#endif
}

UBYTE DEV_Digital_Read(UWORD Pin)
{
	UBYTE Read_value = 0;
#ifdef RPI
#ifdef USE_BCM2835_LIB
	Read_value = bcm2835_gpio_lev(Pin);
#elif USE_WIRINGPI_LIB
	Read_value = digitalRead(Pin);
#elif USE_DEV_LIB
	Read_value = SYSFS_GPIO_Read(Pin);
#endif
#endif

#ifdef JETSON
#ifdef USE_DEV_LIB
	Read_value = SYSFS_GPIO_Read(Pin);
#elif USE_HARDWARE_LIB
	Debug("not support");
#endif
#endif
	return Read_value;
}

/**
 * SPI
**/
void DEV_SPI_WriteByte(uint8_t Value)
{
#ifdef RPI
#ifdef USE_BCM2835_LIB
	bcm2835_spi_transfer(Value);
#elif USE_WIRINGPI_LIB
	wiringPiSPIDataRW(0,&Value,1);
#elif USE_DEV_LIB
	DEV_HARDWARE_SPI_TransferByte(Value);
#endif
#endif

#ifdef JETSON
#ifdef USE_DEV_LIB
	SYSFS_software_spi_transfer(Value);
#elif USE_HARDWARE_LIB
	Debug("not support");
#endif
#endif
}

void DEV_SPI_Write_nByte(uint8_t *pData, uint32_t Len)
{
#ifdef RPI
#ifdef USE_BCM2835_LIB
	char rData[Len];
	bcm2835_spi_transfernb((char *)pData,rData,Len);
#elif USE_WIRINGPI_LIB
	wiringPiSPIDataRW(0, pData, Len);
#elif USE_DEV_LIB
	DEV_HARDWARE_SPI_Transfer(pData, Len);
#endif
#endif

#ifdef JETSON
#ifdef USE_DEV_LIB
	//JETSON nano waits for hardware SPI
	Debug("not support");
#elif USE_HARDWARE_LIB
	Debug("not support");
#endif
#endif
}

/**
 * GPIO Mode
**/
void DEV_GPIO_Mode(UWORD Pin, UWORD Mode)
{
#ifdef RPI
#ifdef USE_BCM2835_LIB
	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);
	}
#elif USE_WIRINGPI_LIB
	if(Mode == 0 || Mode == INPUT) {
		pinMode(Pin, INPUT);
		pullUpDnControl(Pin, PUD_UP);
	} else {
		pinMode(Pin, OUTPUT);
		// Debug (" %d OUT \r\n",Pin);
	}
#elif USE_DEV_LIB
	SYSFS_GPIO_Export(Pin);
	if(Mode == 0 || Mode == SYSFS_GPIO_IN) {
		SYSFS_GPIO_Direction(Pin, SYSFS_GPIO_IN);
		// Debug("IN Pin = %d\r\n",Pin);
	} else {
		SYSFS_GPIO_Direction(Pin, SYSFS_GPIO_OUT);
		// Debug("OUT Pin = %d\r\n",Pin);
	}
#endif
#endif

#ifdef JETSON
#ifdef USE_DEV_LIB
	SYSFS_GPIO_Export(Pin);
	SYSFS_GPIO_Direction(Pin, Mode);
#elif USE_HARDWARE_LIB
	Debug("not support");
#endif
#endif
}

/**
 * delay x ms
**/
void DEV_Delay_ms(UDOUBLE xms)
{
#ifdef RPI
#ifdef USE_BCM2835_LIB
	bcm2835_delay(xms);
#elif USE_WIRINGPI_LIB
	delay(xms);
#elif USE_DEV_LIB
	UDOUBLE i;
	for(i=0; i < xms; i++) {
		usleep(1000);
	}
#endif
#endif

#ifdef JETSON
	UDOUBLE i;
	for(i=0; i < xms; i++) {
		usleep(1000);
	}
#endif
}

static int DEV_Equipment_Testing(void)
{
	FILE *fp;
	char issue_str[64];

	fp = fopen("/etc/issue", "r");
	if (fp == NULL) {
		Debug("Unable to open /etc/issue");
		return -1;
	}
	if (fread(issue_str, 1, sizeof(issue_str), fp) <= 0) {
		Debug("Unable to read from /etc/issue");
		return -1;
	}
	issue_str[sizeof(issue_str)-1] = '\0';
	fclose(fp);

	printf("Current environment: ");
#ifdef RPI
	char systems[][9] = {"Raspbian", "Debian", "NixOS"};
	int detected = 0;
	for(int i=0; i<3; i++) {
		if (strstr(issue_str, systems[i]) != NULL) {
			printf("%s\n", systems[i]);
			detected = 1;
		}
	}
	if (!detected) {
		printf("not recognized\n");
		printf("Built for Raspberry Pi, but unable to detect environment.\n");
		printf("Perhaps you meant to 'make JETSON' instead?\n");
		return -1;
	}
#endif
#ifdef JETSON
	char system[] = {"Ubuntu"};
	if (strstr(issue_str, system) != NULL) {
		printf("%s\n", system);
	} else {
		printf("not recognized\n");
		printf("Built for Jetson, but unable to detect environment.\n");
		printf("Perhaps you meant to 'make RPI' instead?\n");
		return -1;
	}
#endif
	return 0;
}



void DEV_GPIO_Init(void)
{
#ifdef RPI
	EPD_RST_PIN     = 17;
	EPD_DC_PIN      = 25;
	EPD_CS_PIN      = 8;
    EPD_PWR_PIN     = 18;
	EPD_BUSY_PIN    = 24;
#elif JETSON
	EPD_RST_PIN     = GPIO17;
	EPD_DC_PIN      = GPIO25;
	EPD_CS_PIN      = SPI0_CS0;
    EPD_PWR_PIN     = GPIO18;
	EPD_BUSY_PIN    = GPIO24;
#endif

	DEV_GPIO_Mode(EPD_RST_PIN, 1);
	DEV_GPIO_Mode(EPD_DC_PIN, 1);
	DEV_GPIO_Mode(EPD_CS_PIN, 1);
    DEV_GPIO_Mode(EPD_PWR_PIN, 1);
	DEV_GPIO_Mode(EPD_BUSY_PIN, 0);

	DEV_Digital_Write(EPD_CS_PIN, 1);
    DEV_Digital_Write(EPD_PWR_PIN, 1);
}
/******************************************************************************
function:	Module Initialize, the library and initialize the pins, SPI protocol
parameter:
Info:
******************************************************************************/
UBYTE DEV_Module_Init(void)
{
    printf("/***********************************/ \r\n");
	if(DEV_Equipment_Testing() < 0) {
		return 1;
	}
#ifdef RPI
#ifdef USE_BCM2835_LIB
	if(!bcm2835_init()) {
		printf("bcm2835 init failed  !!! \r\n");
		return 1;
	} else {
		printf("bcm2835 init success !!! \r\n");
	}

	// GPIO Config
	DEV_GPIO_Init();

	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_128);  //Frequency
	bcm2835_spi_chipSelect(BCM2835_SPI_CS0);                     //set CE0
	bcm2835_spi_setChipSelectPolarity(BCM2835_SPI_CS0, LOW);     //enable cs0

#elif USE_WIRINGPI_LIB
	//if(wiringPiSetup() < 0)//use wiringpi Pin number table
	if(wiringPiSetupGpio() < 0) { //use BCM2835 Pin number table
		printf("set wiringPi lib failed	!!! \r\n");
		return 1;
	} else {
		printf("set wiringPi lib success !!! \r\n");
	}

	// GPIO Config
	DEV_GPIO_Init();
	wiringPiSPISetup(0,10000000);
	// wiringPiSPISetupMode(0, 32000000, 0);
#elif USE_DEV_LIB
	printf("Write and read /dev/spidev0.0 \r\n");
	DEV_GPIO_Init();
	DEV_HARDWARE_SPI_begin("/dev/spidev0.0");
    DEV_HARDWARE_SPI_setSpeed(10000000);
#endif

#elif JETSON
#ifdef USE_DEV_LIB
	DEV_GPIO_Init();
	printf("Software spi\r\n");
	SYSFS_software_spi_begin();
	SYSFS_software_spi_setBitOrder(SOFTWARE_SPI_MSBFIRST);
	SYSFS_software_spi_setDataMode(SOFTWARE_SPI_Mode0);
	SYSFS_software_spi_setClockDivider(SOFTWARE_SPI_CLOCK_DIV4);
#elif USE_HARDWARE_LIB
	printf("Write and read /dev/spidev0.0 \r\n");
	DEV_GPIO_Init();
	DEV_HARDWARE_SPI_begin("/dev/spidev0.0");
#endif

#endif
    printf("/***********************************/ \r\n");
	return 0;
}

/******************************************************************************
function:	Module exits, closes SPI and BCM2835 library
parameter:
Info:
******************************************************************************/
void DEV_Module_Exit(void)
{
#ifdef RPI
#ifdef USE_BCM2835_LIB
	DEV_Digital_Write(EPD_CS_PIN, LOW);
    DEV_Digital_Write(EPD_PWR_PIN, LOW);
	DEV_Digital_Write(EPD_DC_PIN, LOW);
	DEV_Digital_Write(EPD_RST_PIN, LOW);

	bcm2835_spi_end();
	bcm2835_close();
#elif USE_WIRINGPI_LIB
	DEV_Digital_Write(EPD_CS_PIN, 0);
    DEV_Digital_Write(EPD_PWR_PIN, 0);
	DEV_Digital_Write(EPD_DC_PIN, 0);
	DEV_Digital_Write(EPD_RST_PIN, 0);
#elif USE_DEV_LIB
	DEV_HARDWARE_SPI_end();
	DEV_Digital_Write(EPD_CS_PIN, 0);
    DEV_Digital_Write(EPD_PWR_PIN, 0);
	DEV_Digital_Write(EPD_DC_PIN, 0);
	DEV_Digital_Write(EPD_RST_PIN, 0);
#endif

#elif JETSON
#ifdef USE_DEV_LIB
	SYSFS_GPIO_Unexport(EPD_CS_PIN);
    SYSFS_GPIO_Unexport(EPD_PWR_PIN;
	SYSFS_GPIO_Unexport(EPD_DC_PIN);
	SYSFS_GPIO_Unexport(EPD_RST_PIN);
	SYSFS_GPIO_Unexport(EPD_BUSY_PIN);
#elif USE_HARDWARE_LIB
	Debug("not support");
#endif
#endif
}