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e-Paper/RaspberryPi_JetsonNano/c/lib/Config/RPI_gpiod.c

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+/*****************************************************************************
+* | File        :   RPI_GPIOD.c
+* | Author      :   Waveshare team
+* | Function    :   Drive GPIO
+* | Info        :   Read and write gpio
+*----------------
+* |	This version:   V1.0
+* | Date        :   2023-11-15
+* | Info        :   Basic version
+*
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documnetation files (the "Software"), to deal
+# GPIOD_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 folGPIOD_LOWing conditions:
+#
+# The above copyright notice and this permission notice shall be included GPIOD_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. GPIOD_IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY WHETHER GPIOD_IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# GPIOD_OUT OF OR GPIOD_IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS GPIOD_IN
+# THE SOFTWARE.
+#
+******************************************************************************/
+#include "RPI_gpiod.h"
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <gpiod.h>
+
+struct gpiod_chip *gpiochip;
+struct gpiod_line *gpioline;
+int ret;
+
+int GPIOD_Export()
+{   
+    char buffer[NUM_MAXBUF];
+    FILE *fp;
+
+    fp = popen("cat /proc/cpuinfo | grep 'Raspberry Pi 5'", "r");
+    if (fp == NULL) {
+        GPIOD_Debug("It is not possible to determine the model of the Raspberry PI\n");
+        return -1;
+    }
+
+    if(fgets(buffer, sizeof(buffer), fp) != NULL)
+    {
+        gpiochip = gpiod_chip_open("/dev/gpiochip4");
+        if (gpiochip == NULL)
+        {
+            GPIOD_Debug( "gpiochip4 Export Failed\n");
+            return -1;
+        }
+    }
+    else
+    {
+        gpiochip = gpiod_chip_open("/dev/gpiochip0");
+        if (gpiochip == NULL)
+        {
+            GPIOD_Debug( "gpiochip0 Export Failed\n");
+            return -1;
+        }
+    }
+
+        
+    return 0;
+}
+
+int GPIOD_Unexport(int Pin)
+{
+    gpioline = gpiod_chip_get_line(gpiochip, Pin);
+    if (gpioline == NULL)
+    {
+        GPIOD_Debug( "Export Failed: Pin%d\n", Pin);
+        return -1;
+    }
+
+    gpiod_line_release(gpioline);
+    
+    GPIOD_Debug( "Unexport: Pin%d\r\n", Pin);
+    
+    return 0;
+}
+
+int GPIOD_Unexport_GPIO(void)
+{
+    gpiod_line_release(gpioline);
+    gpiod_chip_close(gpiochip);
+
+    return 0;
+}
+
+int GPIOD_Direction(int Pin, int Dir)
+{
+    gpioline = gpiod_chip_get_line(gpiochip, Pin);
+    if (gpioline == NULL)
+    {
+        GPIOD_Debug( "Export Failed: Pin%d\n", Pin);
+        return -1;
+    }
+
+    if(Dir == GPIOD_IN)
+    {
+        ret = gpiod_line_request_input(gpioline, "gpio");
+        if (ret != 0)
+        {
+            GPIOD_Debug( "Export Failed: Pin%d\n", Pin);
+            return -1;
+        }        
+        GPIOD_Debug("Pin%d:intput\r\n", Pin);
+    }
+    else
+    {
+        ret = gpiod_line_request_output(gpioline, "gpio", 0);
+        if (ret != 0)
+        {
+            GPIOD_Debug( "Export Failed: Pin%d\n", Pin);
+            return -1;
+        }        
+        GPIOD_Debug("Pin%d:Output\r\n", Pin);
+    }
+    return 0;
+}
+
+int GPIOD_Read(int Pin)
+{
+    gpioline = gpiod_chip_get_line(gpiochip, Pin);
+    if (gpioline == NULL)
+    {
+        GPIOD_Debug( "Export Failed: Pin%d\n", Pin);
+        return -1;
+    }
+
+    ret = gpiod_line_get_value(gpioline);
+    if (ret < 0)
+    {
+        GPIOD_Debug( "failed to read value!\n");
+        return -1;
+    }
+
+    return(ret);
+}
+
+int GPIOD_Write(int Pin, int value)
+{
+    gpioline = gpiod_chip_get_line(gpiochip, Pin);
+    if (gpioline == NULL)
+    {
+        GPIOD_Debug( "Export Failed: Pin%d\n", Pin);
+        return -1;
+    }     
+
+    ret = gpiod_line_set_value(gpioline, value);
+    if (ret != 0)
+    {
+        GPIOD_Debug( "failed to write value! : Pin%d\n", Pin);
+        return -1;
+    }
+    return 0;
+}