基于stm32单片机实现两块HC-12之间通信中的hc12.c代码

以下是一个简单的基于STM32单片机实现两块HC-12之间通信的hc12.c代码示例：

#include "stm32f4xx.h"
#include "stm32f4xx_gpio.h"
#include "stm32f4xx_rcc.h"
#include "stm32f4xx_usart.h"

USART_InitTypeDef USART_InitStructure;

void USART_Configuration(void)
{
    USART_InitStructure.USART_BaudRate = 9600;
    USART_InitStructure.USART_WordLength = USART_WordLength_8b;
    USART_InitStructure.USART_StopBits = USART_StopBits_1;
    USART_InitStructure.USART_Parity = USART_Parity_No;
    USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
    USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
    USART_Init(USART1, &USART_InitStructure);
    USART_Cmd(USART1, ENABLE);
}

void GPIO_Configuration(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;
    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9 | GPIO_Pin_10;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP ;
    GPIO_Init(GPIOA, &GPIO_InitStructure);
    GPIO_PinAFConfig(GPIOA, GPIO_PinSource9, GPIO_AF_USART1);
    GPIO_PinAFConfig(GPIOA, GPIO_PinSource10, GPIO_AF_USART1);
}

int main(void)
{
    USART_Configuration();
    GPIO_Configuration();

    while(1)
    {
        if(USART_GetFlagStatus(USART1, USART_FLAG_RXNE) != RESET)
        {
            uint16_t data = USART_ReceiveData(USART1);
            USART_SendData(USART1, data);
        }
    }
}

该代码需要先进行串口初始化和GPIO初始化，然后进入一个死循环中，不断检测串口接收到的数据并将其发送回去。在此基础上，可以进行更多的数据处理和通信控制。