sdk:examples: add led_toggle

Signed-off-by: liangkangnan <liangkangnan@163.com>

sdk/examples/led_toggle/.gitignore

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+# Object files
+*.o
+*.ko
+*.obj
+*.bin
+*.dump
+*.mem
+gpio

sdk/examples/led_toggle/Makefile

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+RISCV_ARCH := rv32im
+RISCV_ABI := ilp32
+RISCV_MCMODEL := medlow
+
+
+TARGET = led_toggle
+
+
+#CFLAGS += -DSIMULATION
+#CFLAGS += -O2
+#ASM_SRCS +=
+#LDFLAGS +=
+#INCLUDES += -I.
+
+C_SRCS := \
+	main.c \
+
+
+BSP_DIR = ../../bsp
+include ../../bsp/bsp.mk

sdk/examples/led_toggle/README.md

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+每500ms翻转GPIO电平。

sdk/examples/led_toggle/main.c

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+#include <stdint.h>
+
+#include "../../bsp/include/gpio.h"
+#include "../../bsp/include/utils.h"
+#include "../../bsp/include/pinmux.h"
+
+int main()
+{
+    // IO7用作GPIO7
+    pinmux_set_io7_func(IO7_GPIO7);
+    // gpio7输出模式
+    gpio_set_mode(GPIO7, GPIO_MODE_OUTPUT);
+
+    while (1) {
+        gpio_set_output_data(GPIO7, 1);  // GPIO7输出高
+        busy_wait(500000);
+        gpio_set_output_data(GPIO7, 0);  // GPIO7输出低
+        busy_wait(500000);
+    }
+}