Interaction method I between STM32 single chip microcomputer and ld3320 voice module

stm32 SCM and LD3320 Voice module interaction method 1

Serial port interaction method link

## Interactive mode : stm32 Read LD3320 Corresponding to the level change of the pin , Achieve control

1. Hardware wiring
LD3320 and stm32
GND —— GND
5V —— 5V
notes ：
①LD3320 Of RXD,TXD,3.3V The pin can be left alone
②LD3320 Of P1^0 There's another one out there LED Small lights , Small lamp negative pole and LD3320 and stm32 common GND

2.LD3320 Procedure part
LD3320 Refer to the official schedule （YS-V0.7 Password mode in the project template ）, The specific changes are as follows ：
①main function


LD3320 Train schedule ：
link ：https://pan.baidu.com/s/1DuKH3GuQ08w8RABLPgQajA
Extraction code ：49xo

3.stm32 Procedure part
General idea ： adopt stm32f103 One pin of （PA1） Read out LD3320 Of P1^0 The level of the pin changes , then stm32 The other pin (PA2) To control the LED The state of the small lamp

LD3320 Received the light on command , P1^0 Output high level , be stm32 Pin PA1 Read the level ,PA2 Output high level 
LD3320 Received the light off command , P1^0 Output low level , be stm32 Pin PA1 Read the level ,PA2 Output low level 

Reference procedure ：

void GPIO_Configuration(void)
{
    	
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);	
	GPIO_InitTypeDef GPIO_InitStructure;
	// Output pin configuration 
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
	GPIO_Init(GPIOA, &GPIO_InitStructure);
	// Input pin configuration 
	GPIO_InitStructure.GPIO_Pin  = GPIO_Pin_1;
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPD; // Drop down input 
	GPIO_InitStructure.GPIO_Speed= GPIO_Speed_50MHz;
	GPIO_Init(GPIOA, &GPIO_InitStructure);
}

The main function ：

#define LED GPIO_ReadInputDataBit(GPIOA,GPIO_Pin_1) // Read PA1 level  
int main(void)
{
    
	GPIO_Configuration();
	while(1)
	{
    
		if(LED == 1)
		{
    					
			GPIO_SetBits(GPIOA,GPIO_Pin_2);	//PA2 Output high level 
		}
		else
		{
    
			GPIO_ResetBits(GPIOA,GPIO_Pin_2);//PA2 Output low level  
		}
			
   }
}

4. summary
Therefore, we can draw inferences from one instance ： For example, turn on the steering gear , The command to turn on the fan only needs to change the corresponding password , Configure the corresponding IO Control can be realized through the port .

 advantage ：
 Compared with serial port interaction, the overall implementation idea is very simple , Easy to implement 
 shortcoming ：
 When more modules are needed, it wastes the of MCU IO mouth 

Project code
link :https://pan.baidu.com/s/18wBMPuvAbLh-IcVmADP8Eg
Extraction code :8q4j