[feat] add gpio_key demo

example/peripherals/gpio/gpio_key/CMakeLists.txt

@@ -0,0 +1,9 @@
+cmake_minimum_required(VERSION 3.10)
+
+include(proj.conf)
+
+project(${EXAMPLE_NAME} VERSION 0.1)
+add_executable(${EXAMPLE_NAME}.elf main.c)
+
+add_subdirectory(${SDK_BASE_DIR} sdk)
+target_link_libraries(${EXAMPLE_NAME}.elf sdk)

example/peripherals/gpio/gpio_key/Makefile

@@ -0,0 +1,18 @@
+EXAMPLE_BASE_DIR ?= $(shell realpath .)
+EXAMPLE_NAME := $(notdir $(patsubst %/,%,$(CURDIR)))
+SDK_BASE_DIR ?= $(shell realpath ./../../../..)
+
+export SDK_BASE_DIR
+export EXAMPLE_NAME
+export EXAMPLE_BASE_DIR
+
+GCC_PATH := $(shell which arm-none-eabi-gcc)
+CROSS_COMPILE := $(patsubst %gcc,%,$(GCC_PATH))
+ifeq ($(GCC_PATH),)
+$(error arm-none-eabi-gcc not found in PATH. Please install the ARM toolchain.)
+endif
+
+# add custom cmake definition
+#cmake_definition+=-Dxxx=sss
+
+include $(SDK_BASE_DIR)/project.build

example/peripherals/gpio/gpio_key/main.c

@@ -0,0 +1,31 @@
+#include "resets.h"
+#include "gpio.h"
+#include "uart.h"
+#include "stdio.h"
+
+#define KEY_PIN (24)
+#define LED_PIN (25)
+
+int main(void)
+{
+    reset_unreset_blocks_wait(RESETS_BLOCK_IO_BANK0 | RESETS_BLOCK_UART0);
+    gpio_init(0, GPIO_FUNC_UART | GPIO_PULL_UP | GPIO_DRIVE_4MA); /* UART_TX pin */
+    gpio_init(1, GPIO_FUNC_UART | GPIO_PULL_UP | GPIO_SCHMITT | GPIO_PAD_IE | GPIO_PAD_OD); /* UART_RX pin */
+    uart_init(uart0_hw, 6 * 1000 * 1000, UART_DATABITS_8 | UART_PARITY_NONE | UART_STOPBITS_1);
+    printf("gpio_key example\r\n");
+
+    gpio_init(LED_PIN, GPIO_FUNC_NULL | GPIO_OVER_OUT_HIGH | GPIO_OVER_OE_ENABLE | GPIO_PULL_UP | GPIO_DRIVE_4MA); /* LED pin */
+    gpio_init(KEY_PIN, GPIO_FUNC_NULL | GPIO_PULL_UP | GPIO_SCHMITT | GPIO_PAD_IE | GPIO_PAD_OD); /* KEY pin */
+
+    while (1) {
+        if (gpio_read(KEY_PIN)) {
+            /* read pin status as 1: release key  */
+            gpio_clear(LED_PIN); /* low level for turn off LED */
+        } else {
+            /* read pin status as 0: press key  */
+            gpio_set(LED_PIN); /* high level for turn on LED */
+        }
+    }
+
+    return 0;
+}

example/peripherals/gpio/gpio_key/proj.conf

@@ -0,0 +1 @@
+# set(CONFIG_COMPONENT1 1)