/***************************************************************************** * | 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 /****************************************************************************** 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 linkļ¼š*/ /*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(); }