wavesharelib/Jetson Nano/c/lib/Config/DEV_Config.c

/*****************************************************************************
* | File      	:   DEV_Config.c
* | Author      :   Waveshare team
* | Function    :   Hardware underlying interface
* | Info        :
*----------------
* |	This version:   V1.0
* | Date        :   2019-06-05
* | 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 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)
{
    SYSFS_GPIO_Export(EPD_CS_PIN);
    SYSFS_GPIO_Export(EPD_DC_PIN);
    SYSFS_GPIO_Export(EPD_RST_PIN);
    SYSFS_GPIO_Export(EPD_BUSY_PIN);

    SYSFS_GPIO_Direction(EPD_CS_PIN, OUT);
    SYSFS_GPIO_Direction(EPD_DC_PIN, OUT);
    SYSFS_GPIO_Direction(EPD_RST_PIN, OUT);
    SYSFS_GPIO_Direction(EPD_BUSY_PIN, IN);
}

void DEV_Delay_us(UWORD xus)
{
    for(int j=xus; j > 0; j--);
}

void DEV_Delay_ms(UWORD xms)
{
    for(int j=xms; j > 0; j--)
        for(int j=xms; j > 0; j--);
}

/******************************************************************************
function:	Module Initialize, the BCM2835 library and initialize the pins, SPI protocol
parameter:
Info:
******************************************************************************/
UBYTE DEV_Module_Init(void)
{
    DEV_GPIOConfig();
    
    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);
    return 0;
}

void DEV_SPI_WriteByte(UBYTE value)
{
    SYSFS_software_spi_transfer(value);
}

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

    SYSFS_GPIO_Unexport(EPD_CS_PIN);
    SYSFS_GPIO_Unexport(EPD_DC_PIN);
    SYSFS_GPIO_Unexport(EPD_RST_PIN);
    SYSFS_GPIO_Unexport(EPD_BUSY_PIN);
}