The register of 32 turns on the water flow lamp

(1) Introduction

(2) Working mode

typedef enum { GPIO_Mode_AIN = 0x0, // Analog input GPIO_Mode_IN_FLOATING = 0x04, // Floating input GPIO_Mode_IPD = 0x28, // Drop down input GPIO_Mode_IPU = 0x48, // Pull up input GPIO_Mode_Out_OD = 0x14, // Open drain output GPIO_Mode_Out_PP = 0x10, // Push pull output GPIO_Mode_AF_OD = 0x1C, // Multiplexed open drain output GPIO_Mode_AF_PP = 0x18 // Multiplexed push-pull output } GPIOMode_TypeDef;

(3) Addressing of GPIO

  For details, please move to the big man and speak clearly:

STM32 register introduction, address search, and direct operation register_ Geekyatao CSDN blog

(1) Assembly lighting

The following is the assembler for lighting the LED of PB5 connection:

Note: when selecting the operating environment, you do not need to check "Startup" and "CORE".

LED0 EQU 0x42218194 RCC_APB2ENR EQU 0x40021018 ;GPIOA_CRH EQU 0x40010804 GPIOB_CRL EQU 0x40010C00 Stack_Size EQU 0x00000400 AREA STACK, NOINIT, READWRITE, ALIGN=3 Stack_Mem SPACE Stack_Size __initial_sp AREA RESET, DATA, READONLY __Vectors DCD __initial_sp DCD Reset_Handler AREA |.text|, CODE, READONLY THUMB REQUIRE8 PRESERVE8 ENTRY Reset_Handler BL LED_Init MainLoop BL LED_ON BL Delay BL LED_OFF BL Delay B MainLoop LED_Init PUSH LDR R0,=RCC_APB2ENR ORR R0,R0,#0x08 LDR R1,=RCC_APB2ENR STR R0,[R1] LDR R0,=GPIOB_CRL BIC R0,R0,#0XFF0FFFFF LDR R1,=GPIOB_CRL STR R0,[R1] LDR R0,=GPIOB_CRL ORR R0,R0,#0X00300000 LDR R1,=GPIOB_CRL STR R0,[R1] MOV R0,#1 LDR R1,=LED0 STR R0,[R1] POP LED_ON PUSH MOV R0,#0 LDR R1,=LED0 STR R0,[R1] POP LED_OFF PUSH MOV R0,#1 LDR R1,=LED0 STR R0,[R1] POP Delay PUSH MOVS R0,#0 MOVS R1,#0 MOVS R2,#0 DelayLoop0 ADDS R0,R0,#1 CMP R0,#330 BCC DelayLoop0 MOVS R0,#0 ADDS R1,R1,#1 CMP R1,#330 BCC DelayLoop0 MOVS R0,#0 MOVS R1,#0 ADDS R2,R2,#1 CMP R2,#15 BCC DelayLoop0 POP END

Next, use mcuisp to burn the program

Burning succeeded

Here are the connections:  

Connect one end of LED to PB5 and one end to 3.3V

Note: it's best not to connect 5V. There is no resistance protection. The author has burned several

Here I use the STM32F103RC small blackboard I bought when preparing for the video game

The effect is shown in the figure:

(2) C language lighting

I changed it with the lighting program of punctual atom. Because there are too many documents, only some main documents are listed below

The code is as follows:

test.c

#include "sys.h" #include "usart.h" #include "delay.h" #include "led.h" int main(void) { Stm32_Clock_Init(9); //System clock setting delay_init(72); //Delay initialization LED_Init(); //LED initialization while(1) { LED0=0; delay_ms(1000); //Delay 1s LED0=1; delay_ms(1000); } }

led.h

#ifndef __LED_H #define __LED_H #include "sys.h" #define LED0 PAout(8) // PA8 void LED_Init(void); #endif

led.c

#include "sys.h" #include "led.h" //LED IO initialization void LED_Init(void) { RCC->APB2ENR|=1<<2; //Enable PORTA clock GPIOA->CRH&=0XFFFFFFF0; GPIOA->CRH|=0X00000003;//PA8 push pull output GPIOA->ODR|=1<<8; //PA8 output high }

Both ends of the LED are connected to PA8 and 3.3V respectively

The effect is shown in the figure:

  (3) Library function to realize water lamp

Compared with the register code, the library function is more readable and more convenient to use. This is also the way the author has been using before. Let's write a flow lamp with the library function

The code is as follows:

main.c

#include "led.h" #include "delay.h" #include "sys.h" int main(void) { delay_init(); //Delay function initialization LED_Init(); //LED initialization while(1) { LED0=0; delay_ms(1000); //Delay 1s LED0=1; delay_ms(1000); LED1=0; delay_ms(1000); LED1=1; delay_ms(1000); LED2=0; delay_ms(1000); LED2=1; delay_ms(1000); } }

led.h

#ifndef __LED_H #define __LED_H #include "sys.h" #define LED0 PAout(6) // PA6 #define LED1 PBout(7) // PA7 #define LED2 PBout(8) // PA8 void LED_Init(void); #endif

led.c

#include "led.h" //LED IO³õʼ»¯ void LED_Init(void) { GPIO_InitTypeDef GPIO_InitStructure; RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE); //Enable PB port clock GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6|GPIO_Pin_7|GPIO_Pin_8; //PB6,PB7,PB8 port configuration GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; //Push pull output GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; //The IO speed is 50MHz GPIO_Init(GPIOB, &GPIO_InitStructure); //Initialize GPIOB according to the setting function GPIO_SetBits(GPIOB,GPIO_Pin_6|GPIO_Pin_7|GPIO_Pin_8); //PB6,PB7,PB8 output high }

Three LEDs are used here. The long pin of each LED is connected to 3.3V and the short pin is connected to pb6, 7 and 8 respectively

The effect of hardware is as follows:

This experiment mainly carried out the LED register lighting experiment. Before, it had been written with library functions and had not used registers. This time, I really felt its cumbersome use, especially the GPIO address. I also needed to consult the manual, which was very poor in readability and encountered many difficulties in the programming process. However, I also learned the addressing principle of registers by consulting materials, Although cumbersome, it feels good to communicate with the computer more intuitively.

  STM32 assembler and lighting experiment_ Lxy1360832244 blog - CSDN blog

STM32 register introduction, address search, and direct operation register_ Geekyatao CSDN blog

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