use wiringX as a GPIO library

buildroot-2021.05/configs/milkv_duo_musl_riscv64_defconfig

@@ -268,6 +268,7 @@ BR2_PACKAGE_BUSYBOX_CONFIG_FRAGMENT_FILES=""
 # BR2_PACKAGE_BUSYBOX_SHOW_OTHERS is not set
 # BR2_PACKAGE_BUSYBOX_INDIVIDUAL_BINARIES is not set
 # BR2_PACKAGE_BUSYBOX_WATCHDOG is not set
+BR2_PACKAGE_WIRINGX=y
 BR2_PACKAGE_SKELETON=y
 BR2_PACKAGE_HAS_SKELETON=y
 BR2_PACKAGE_PROVIDES_SKELETON="skeleton-init-sysv"

buildroot-2021.05/package/Config.in

@@ -1,6 +1,7 @@
 menu "Target packages"
 
 	source "package/busybox/Config.in"
+	source "package/wiringx/Config.in"
 	source "package/skeleton/Config.in"
 	source "package/skeleton-custom/Config.in"
 	source "package/skeleton-init-common/Config.in"

buildroot-2021.05/package/wiringx/Config.in

@@ -0,0 +1,4 @@
+config BR2_PACKAGE_WIRINGX
+    bool "wiringX"
+    help
+      wiringX

buildroot-2021.05/package/wiringx/src/wiringx.h

@@ -0,0 +1,110 @@
+/*
+	Copyright (c) 2016 CurlyMo <curlymoo1@gmail.com>
+
+  This Source Code Form is subject to the terms of the Mozilla Public
+  License, v. 2.0. If a copy of the MPL was not distributed with this
+  file, You can obtain one at http://mozilla.org/MPL/2.0/.
+*/
+
+#ifndef _WIRING_X_H_
+#define _WIRING_X_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <errno.h>
+#include <syslog.h>
+
+#define wiringXLog(a, b, ...) _wiringXLog(a, __FILE__, __LINE__, b, ##__VA_ARGS__)
+
+extern void (*_wiringXLog)(int, char *, int, const char *, ...);
+
+#define EXPORT __attribute__((visibility("default")))
+
+#if !defined(PATH_MAX)
+    #if defined(_POSIX_PATH_MAX)
+        #define PATH_MAX _POSIX_PATH_MAX
+    #else
+        #define PATH_MAX 1024
+    #endif
+#endif
+
+enum function_t {
+	FUNCTION_UNKNOWN = 0,
+	FUNCTION_DIGITAL = 2,
+	FUNCTION_ANALOG = 4,
+	FUNCTION_I2C = 16,
+	FUNCTION_INTERRUPT = 32
+};
+
+enum pinmode_t {
+	PINMODE_NOT_SET = 0,
+	PINMODE_INPUT = 2,
+	PINMODE_OUTPUT = 4,
+	PINMODE_INTERRUPT = 8
+};
+
+enum isr_mode_t {
+	ISR_MODE_UNKNOWN = 0,
+	ISR_MODE_RISING = 2,
+	ISR_MODE_FALLING = 4,
+	ISR_MODE_BOTH = 8,
+	ISR_MODE_NONE = 16
+};
+
+enum digital_value_t {
+	LOW,
+	HIGH
+};
+
+typedef struct wiringXSerial_t {
+	unsigned int baud;
+	unsigned int databits;
+	unsigned int parity;
+	unsigned int stopbits;
+	unsigned int flowcontrol;
+} wiringXSerial_t;
+
+void delayMicroseconds(unsigned int);
+int pinMode(int, enum pinmode_t);
+int wiringXSetup(char *name, void (*func)(int, char *, int, const char *, ...));
+int wiringXGC(void);
+
+// int analogRead(int channel);
+int digitalWrite(int, enum digital_value_t);
+int digitalRead(int);
+int waitForInterrupt(int, int);
+int wiringXISR(int, enum isr_mode_t);
+
+int wiringXI2CRead(int);
+int wiringXI2CReadReg8(int, int);
+int wiringXI2CReadReg16(int, int);
+int wiringXI2CWrite(int, int);
+int wiringXI2CWriteReg8(int, int, int);
+int wiringXI2CWriteReg16(int, int, int);
+int wiringXI2CSetup(const char *, int);
+
+int wiringXSPIGetFd(int channel);
+int wiringXSPIDataRW(int channel, unsigned char *data, int len);
+int wiringXSPISetup(int channel, int speed);
+
+int wiringXSerialOpen(const char *, struct wiringXSerial_t);
+void wiringXSerialFlush(int);
+void wiringXSerialClose(int);
+void wiringXSerialPutChar(int, unsigned char);
+void wiringXSerialPuts(int, const char *);
+void wiringXSerialPrintf(int, const char *, ...);
+int wiringXSerialDataAvail(int);
+int wiringXSerialGetChar(int);
+
+char *wiringXPlatform(void);
+int wiringXValidGPIO(int);
+int wiringXSelectableFd(int);
+int wiringXSupportedPlatforms(char ***);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif

buildroot-2021.05/package/wiringx/wiringx.mk

@@ -0,0 +1,17 @@
+WIRINGX_SITE = $(TOPDIR)/package/wiringx
+WIRINGX_VERSION = 2023.05.30
+WIRINGX_SITE_METHOD = local
+
+WIRINGX_INSTALL_STAGING = YES
+
+define WIRINGX_INSTALL_STAGING_CMDS
+	$(INSTALL) -D -m 0644 $(@D)/src/wiringx.h $(STAGING_DIR)/usr/include/
+	$(INSTALL) -D -m 0644 $(@D)/src/libwiringx.so $(STAGING_DIR)/usr/lib/
+endef
+
+define WIRINGX_INSTALL_TARGET_CMDS
+	$(INSTALL) -D -m 0644 $(@D)/src/wiringx.h $(TARGET_DIR)/usr/include/
+	$(INSTALL) -D -m 0644 $(@D)/src/libwiringx.so $(TARGET_DIR)/usr/lib/
+endef
+
+$(eval $(generic-package))