177 lines
5.1 KiB
C
177 lines
5.1 KiB
C
/*****************************************************************************
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* | File : DEV_Config.c
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* | Author : Waveshare team
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* | Function : Hardware underlying interface
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* | Info :
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*----------------
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* | This version: V3.0
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* | Date : 2019-09-17
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* | Info :
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#
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# Permission is hereby granted, free of charge, to any person obtaining a copy
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# of this software and associated documnetation files (the "Software"), to deal
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# in the Software without restriction, including without limitation the rights
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# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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# copies of theex Software, and to permit persons to whom the Software is
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# furished to do so, subject to the following conditions:
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#
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# The above copyright notice and this permission notice shall be included in
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# all copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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# FITNESS OR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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# LIABILITY WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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# THE SOFTWARE.
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#
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******************************************************************************/
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#include "DEV_Config.h"
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#include <fcntl.h>
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/******************************************************************************
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function: GPIO Write
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parameter:
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Info:
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******************************************************************************/
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void DEV_Digital_Write(UWORD Pin, UBYTE Value)
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{
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bcm2835_gpio_write(Pin, Value);
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}
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/******************************************************************************
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function: GPIO Read
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parameter:
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Info:
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******************************************************************************/
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UBYTE DEV_Digital_Read(UWORD Pin)
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{
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UBYTE Read_Value = 0;
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Read_Value = bcm2835_gpio_lev(Pin);
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return Read_Value;
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}
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/******************************************************************************
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function: SPI Write
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parameter:
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Info:
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******************************************************************************/
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void DEV_SPI_WriteByte(UBYTE Value)
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{
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bcm2835_spi_transfer(Value);
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}
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/******************************************************************************
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function: SPI Read
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parameter:
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Info:
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******************************************************************************/
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UBYTE DEV_SPI_ReadByte()
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{
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UBYTE Read_Value = 0x00;
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Read_Value = bcm2835_spi_transfer(0x00);
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return Read_Value;
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}
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/******************************************************************************
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function: Time delay for ms
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parameter:
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Info:
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******************************************************************************/
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void DEV_Delay_ms(UDOUBLE xms)
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{
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bcm2835_delay(xms);
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}
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/******************************************************************************
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function: Time delay for us
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parameter:
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Info:
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******************************************************************************/
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void DEV_Delay_us(UDOUBLE xus)
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{
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bcm2835_delayMicroseconds(xus);
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}
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/**
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* GPIO Mode
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**/
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static void DEV_GPIO_Mode(UWORD Pin, UWORD Mode)
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{
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if(Mode == 0 || Mode == BCM2835_GPIO_FSEL_INPT) {
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bcm2835_gpio_fsel(Pin, BCM2835_GPIO_FSEL_INPT);
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} else {
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bcm2835_gpio_fsel(Pin, BCM2835_GPIO_FSEL_OUTP);
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}
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}
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/**
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* GPIO Init
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**/
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static void DEV_GPIO_Init(void)
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{
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DEV_GPIO_Mode(EPD_RST_PIN, BCM2835_GPIO_FSEL_OUTP);
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DEV_GPIO_Mode(EPD_CS_PIN, BCM2835_GPIO_FSEL_OUTP);
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DEV_GPIO_Mode(EPD_BUSY_PIN, BCM2835_GPIO_FSEL_INPT);
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DEV_Digital_Write(EPD_CS_PIN, HIGH);
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}
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/******************************************************************************
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function: Module Initialize, the library and initialize the pins, SPI protocol
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parameter:
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Info:
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******************************************************************************/
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UBYTE DEV_Module_Init(void)
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{
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Debug("/***********************************/ \r\n");
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if(!bcm2835_init()) {
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Debug("bcm2835 init failed !!! \r\n");
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return 1;
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} else {
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Debug("bcm2835 init success !!! \r\n");
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}
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bcm2835_spi_begin(); //Start spi interface, set spi pin for the reuse function
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bcm2835_spi_setBitOrder(BCM2835_SPI_BIT_ORDER_MSBFIRST); //High first transmission
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bcm2835_spi_setDataMode(BCM2835_SPI_MODE0); //spi mode 0
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//bcm2835_spi_setClockDivider(BCM2835_SPI_CLOCK_DIVIDER_16); //For RPi3/3B/3B+
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bcm2835_spi_setClockDivider(BCM2835_SPI_CLOCK_DIVIDER_32); //For RPi 4
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/* SPI clock reference link：*/
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/*http://www.airspayce.com/mikem/bcm2835/group__constants.html#gaf2e0ca069b8caef24602a02e8a00884e*/
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//GPIO Config
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DEV_GPIO_Init();
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Debug("/***********************************/ \r\n");
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return 0;
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}
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/******************************************************************************
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function: Module exits, closes SPI and BCM2835 library
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parameter:
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Info:
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******************************************************************************/
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void DEV_Module_Exit(void)
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{
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DEV_Digital_Write(EPD_CS_PIN, LOW);
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DEV_Digital_Write(EPD_RST_PIN, LOW);
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bcm2835_spi_end();
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bcm2835_close();
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}
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