1. Mx6u-alpha development board (buzzer experiment)

One 、 Hardware schematic analysis

BEEP control IO by SNVS_TAMPER1, When the output is low, the buzzer rings , The buzzer doesn't sound when outputting high level .

Two 、 The experimental program was written

1、 Initialize reuse

initialization SNVS_TAMPER1 This IO Reuse as GPIO5_IO01

2、 Set electrical properties

Set up SNVS_TAMPER1 This IO Electrical properties of

3、 initialization GPIO

4、 control GPIO Output high and low level

//bsp_beep.h
#ifndef __BSP_BEEP_H
#define __BSP_BEEP_H
#include "imx6ul.h"

/*  Function declaration  */
void beep_init(void);
void beep_switch(int status);
#endif

//bsp_beep.c
#include "bsp_beep.h"

void beep_init(void)
{
    
	// initialization IO Reuse , Reuse as GPIO5_IO01 
	IOMUXC_SetPinMux(IOMUXC_SNVS_SNVS_TAMPER1_GPIO5_IO01,0);		
	// To configure GPIO1_IO03 Of IO attribute 
	IOMUXC_SetPinConfig(IOMUXC_SNVS_SNVS_TAMPER1_GPIO5_IO01,0X10B0);
	// initialization GPIO,GPIO5_IO01 Set as output 
	GPIO5->GDIR |= (1 << 1);	 
	// Set up GPIO5_IO01 Output high level , Turn off the buzzer 
	GPIO5->DR |= (1 << 1);		
}

void beep_switch(int status)
{
    	
	if(status == ON)
		GPIO5->DR &= ~(1 << 1);	/*  Turn on the buzzer  */
	else if(status == OFF)
		GPIO5->DR |= (1 << 1);	/*  Turn off the buzzer  */
}

//main.c
#include "bsp_clk.h"
#include "bsp_delay.h"
#include "bsp_led.h"
#include "bsp_beep.h"
int main(void)
{
    
	clk_enable();		/*  Enable all clocks  */
	led_init();			/*  initialization led */
	beep_init();		/*  initialization beep */
	while(1)			
	{
    	
		/*  open LED0 And buzzer  */
		led_switch(LED0,ON);	
		beep_switch(ON);
		delay(500);

		/*  close LED0 And buzzer  */
		led_switch(LED0,OFF);	
		beep_switch(OFF);
		delay(500);
	}

	return 0;
}

Just change TARGET、INCDIRS、SRCDIRS that will do

CROSS_COMPILE 	?= arm-linux-gnueabihf-
TARGET		  	?= beep

CC 				:= $(CROSS_COMPILE)gcc
LD				:= $(CROSS_COMPILE)ld
OBJCOPY 		:= $(CROSS_COMPILE)objcopy
OBJDUMP 		:= $(CROSS_COMPILE)objdump

INCDIRS 		:= imx6ul \
				   bsp/clk \
				   bsp/led \
				   bsp/delay  \
				   bsp/beep
				   			   
SRCDIRS			:= project \
				   bsp/clk \
				   bsp/led \
				   bsp/delay \
				   bsp/beep
				   
				   
INCLUDE			:= $(patsubst %, -I %, $(INCDIRS))

SFILES			:= $(foreach dir, $(SRCDIRS), $(wildcard $(dir)/*.S))
CFILES			:= $(foreach dir, $(SRCDIRS), $(wildcard $(dir)/*.c))

SFILENDIR		:= $(notdir  $(SFILES))
CFILENDIR		:= $(notdir  $(CFILES))

SOBJS			:= $(patsubst %, obj/%, $(SFILENDIR:.S=.o))
COBJS			:= $(patsubst %, obj/%, $(CFILENDIR:.c=.o))
OBJS			:= $(SOBJS) $(COBJS)

VPATH			:= $(SRCDIRS)

.PHONY: clean
	
$(TARGET).bin : $(OBJS)
	$(LD) -Timx6ul.lds -o $(TARGET).elf $^
	$(OBJCOPY) -O binary -S $(TARGET).elf [email protected]
	$(OBJDUMP) -D -m arm $(TARGET).elf > $(TARGET).dis

$(SOBJS) : obj/%.o : %.S
	$(CC) -Wall -nostdlib -c -O2  $(INCLUDE) -o [email protected] $<

$(COBJS) : obj/%.o : %.c
	$(CC) -Wall -nostdlib -c -O2  $(INCLUDE) -o [email protected] $<
	
clean:
	rm -rf $(TARGET).elf $(TARGET).dis $(TARGET).bin $(COBJS) $(SOBJS)

3、 ... and 、 Experimental phenomena

LED Buzzer sounds when the light is on ,LED The buzzer does not sound when the light is off