Adding backward compatibility for other ESP-IDF

CMakeLists.txt

@@ -8,6 +8,14 @@ elseif(CONFIG_EPD_2_7)
     list(APPEND srcs "epd2in7.cpp")
 endif()
 
+string(REGEX MATCH "([0-9]+).([0-9])" VERSION ${IDF_VER})
+string(REPLACE "." ";" VERSION_LIST ${VERSION})
+list(GET ${VERSION_LIST} 0 VERSION_MAJOR)
+if(${VERSION_MAJOR} LESS 4)
+    add_compile_definitions(ESP_IDF_VERSION_MAJOR=${VERSION_MAJOR})
+    list(GET ${VERSION_LIST} 0 VERSION_MINOR)
+    add_compile_definitions(ESP_IDF_VERSION_MINOR=${VERSION_MINOR})
+endif()
 idf_component_register(SRCS "${srcs}"
                        INCLUDE_DIRS "include"
                        REQUIRES esp_common driver)

Kconfig

@@ -0,0 +1,55 @@
+menu "E-Paper display configuration"
+
+choice 
+    prompt "Display Type"
+    default EPD_1_54_V2
+    help
+        "Select waveshare's epaper display to be used"
+
+    config EPD_1_54_V2
+        bool "1.54\" V2 Display Module"
+
+    config EPD_2_13_D
+        bool "2.13\" D Display"
+
+	config EPD_2_7
+        bool "2.7\" Display"	
+endchoice
+
+config MOSI_PIN
+    int "DATAIN (MOSI/DIN) Pin number"
+    default 14
+    help
+        set the pin to be connected to mosi/din pin of display
+
+config CLK_PIN
+    int "CLOCK (CLK/SCK) Pin number"
+    default 13
+    help
+        set the pin to be connected to clk/sck pin of display
+
+config CS_PIN
+    int "CHIPSELECT (CS) Pin number"
+    default 15
+    help
+        set the pin to be connected to cs pin of display
+
+config DC_PIN
+    int "DATA/COMMAND (DC) Pin number"
+    default 27
+    help
+        set the pin to be connected to dc pin of display
+
+config RST_PIN
+    int "RESET (RST) Pin number"
+    default 26
+    help
+        set the pin to be connected to rst pin of display
+
+config BUSY_PIN
+    int "BUSY (BUSY) Pin number"
+    default 25
+    help
+        set the pin to be connected to busy pin of display
+
+endmenu

epdif.cpp

@@ -83,7 +83,9 @@ int EpdIf::IfInit(void) {
 
 	}
 
-    // spi_bus_free(HSPI_HOST); -> This generates error on ESP-IDF >= v4.2
+#if ESP_IDF_VERSION_MAJOR < 4
+    spi_bus_free(SPI_HOST); // This generates error on ESP-IDF >= v4.2
+#endif
 
     gpio_config_t io_conf = {};
     io_conf.intr_type = GPIO_INTR_DISABLE;
@@ -113,7 +115,11 @@ int EpdIf::IfInit(void) {
     buscfg.quadhd_io_num = -1;
 
     //Initialize the SPI bus
-    ret=spi_bus_initialize(HSPI_HOST, &buscfg, 0);
+    #if ESP_IDF_VERSION_MAJOR >= 4
+        ret=spi_bus_initialize(HSPI_HOST, &buscfg, 0);
+    #else
+        ret=spi_bus_initialize(SPI_HOST, &buscfg, 0);
+    #endif
     switch (ret) {
         case ESP_ERR_INVALID_ARG:
             ESP_LOGE("EPDIF", "INVALID ARG");
@@ -140,7 +146,12 @@ int EpdIf::IfInit(void) {
     devcfg.queue_size = 1;
 
     //Attach the EPD to the SPI bus
-    ret=spi_bus_add_device(HSPI_HOST, &devcfg, &spi);
+    #if ESP_IDF_VERSION_MAJOR >= 4
+        ret=spi_bus_add_device(HSPI_HOST, &devcfg, &spi);
+    #else
+        ret=spi_bus_add_device(SPI_HOST, &devcfg, &spi);
+    #endif
+
     assert(ret==ESP_OK);
 
     return 0;

include/epdif.h

@@ -37,7 +37,9 @@
 #define BUSY_PIN  CONFIG_BUSY_PIN        
 
 // SPI host
-// #define HSPI_HOST    HHSPI_HOST
+#if ESP_IDF_VERSION_MAJOR < 4
+#define SPI_HOST    HSPI_HOST
+#endif
 
 #ifdef __cplusplus
 extern "C" {