wavesharelib/1.54inch_e-paper_b_code/RaspberryPi/bcm2835/obj/DEV_Config.c

/*****************************************************************************
* | File      	:   DEV_Config.c
* | Author      :   Waveshare team
* | Function    :   Hardware underlying interface
* | Info        :
*                Used to shield the underlying layers of each master 
*                and enhance portability
*----------------
* |	This version:   V2.0
* | Date        :   2018-10-30
* | Info        :
* 1.add:
*   UBYTE\UWORD\UDOUBLE
* 2.Change:
*   EPD_RST -> EPD_RST_PIN
*   EPD_DC -> EPD_DC_PIN
*   EPD_CS -> EPD_CS_PIN
*   EPD_BUSY -> EPD_BUSY_PIN
* 3.Remote:
*   EPD_RST_1\EPD_RST_0
*   EPD_DC_1\EPD_DC_0
*   EPD_CS_1\EPD_CS_0
*   EPD_BUSY_1\EPD_BUSY_0
* 4.add:
*   #define DEV_Digital_Write(_pin, _value) bcm2835_gpio_write(_pin, _value)
*   #define DEV_Digital_Read(_pin) bcm2835_gpio_lev(_pin)
*   #define DEV_SPI_WriteByte(__value) bcm2835_spi_transfer(__value)
#
# 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 the 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"

/******************************************************************************
function:	Initialization pin
parameter:
Info:
******************************************************************************/
static void DEV_GPIOConfig(void)
{
    //output
	bcm2835_gpio_fsel(EPD_RST_PIN, BCM2835_GPIO_FSEL_OUTP);
    bcm2835_gpio_fsel(EPD_DC_PIN, BCM2835_GPIO_FSEL_OUTP);
    bcm2835_gpio_fsel(EPD_CS_PIN, BCM2835_GPIO_FSEL_OUTP);
	
    //intput
	bcm2835_gpio_fsel(EPD_BUSY_PIN,    BCM2835_GPIO_FSEL_INPT);
	
}

/******************************************************************************
function:	Module Initialize, the BCM2835 library and initialize the pins, SPI protocol
parameter:
Info:
******************************************************************************/
UBYTE DEV_ModuleInit(void)
{
    if(!bcm2835_init()) {
        printf("bcm2835 init failed  !!! \r\n");
        return 1;
    } else {
        printf("bcm2835 init success !!! \r\n");
    }
	
	DEV_GPIOConfig();

    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

    return 0;
}

/******************************************************************************
function:	Module exits, closes SPI and BCM2835 library
parameter:
Info:
******************************************************************************/
void DEV_ModuleExit(void)
{
    bcm2835_spi_end();
    bcm2835_close();
}