gpio_input_stc8g1k08a.c

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// Copyright 2022 IOsetting <iosetting(at)outlook.com>
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
 
/***
 * Demo:  STC8G1K08A GPIO Input
 * 
 *   Pin connection:
 * 
 *                                ___
 *   GND <- 1KR <- Key ->  P5.4 -|   |- P3.3  <-- LED --> 4.7KR -> GND
 *                3.3V ->   VCC -|   |- P3.2  <-- LED --> 4.7KR -> GND
 *                         P5.5 -|   |- TX
 *                 GND ->   GND -|___|- RX   
 * 
 * 
 * test-board: Minimum System; test-MCU: STC8G1K08A
 */
 
#include "fw_hal.h"
 
void GPIO_Init(void)
{
    // P3.2, P3.3
    GPIO_P3_SetMode(GPIO_Pin_2|GPIO_Pin_3, GPIO_Mode_Output_PP);
    // P5.4, pullup
    GPIO_P5_SetMode(GPIO_Pin_4, GPIO_Mode_Input_HIP);
    GPIO_SetPullUp(GPIO_Port_5, GPIO_Pin_4, HAL_State_ON);
}
 
int main(void)
{
    GPIO_Init();
    /* Turn LED1 on, LED2 off */
    P32 = SET;
    P33 = RESET;
 
    while(1)
    {
        /* Check if P5.4 is low (Key pressed) */
        if (P54 == RESET)
        {
            /* Switch */
            P3 = P3 & 0xF3 | 0x08;
            SYS_Delay(300);
            /* Restore */
            P3 = P3 & 0xF3 | 0x04;
        }
    }
}