rešitev STM32H7

/*
* Main.s
*
*  Created on: Aug 24, 2022
*      Author: rozman
*/


  .syntax unified
  .cpu cortex-m7
  .thumb


///////////////////////////////////////////////////////////////////////////////
// Definitions
///////////////////////////////////////////////////////////////////////////////
// Definitions section. Define all the registers and
// constants here for code readability.

// Constants

.equ    LEDDELAY,      64000

// For LOOPTC Software delay
// By default 64MHz internal HSI clock is enabled
// Internal loop takes N cycles

// Register Addresses
// You can find the base addresses for all peripherals from Memory Map section 2.3.2
// RM0433 on page 131. Then the offsets can be found on their relevant sections.

// RCC  base address is 0x58024400
//  AHB4ENR register offset is 0xE0
.equ    RCC_AHB4ENR,  0x580244E0 // RCC AHB4 peripheral clock reg

// GPIOI base address is 0x58022000
.equ    GPIOI_BASE,  0x58022000 // GPIOI base address)

//  MODER register offset is 0x00
.equ    GPIOx_MODER,  0x00 // GPIOx port mode register
//  ODR  register offset is 0x14
.equ    GPIOx_ODR,    0x14 // GPIOx output data register
//  BSRR  register offset is 0x18
.equ    GPIOx_BSRR,    0x18 // GPIOx port set/reset register


// Values for BSRR register - pin 13: LED is on, when GPIO is off
.equ    LEDs_OFF,      0x00002000  // Setting pin to 1 -> LED is off
.equ    LEDs_ON,  0x20000000  // Setting pin to 0 -> LED is on


// Start of text section
  .text

  .type  main, %function
  .global main

    .align
main:

    bl INIT_IO    // Priprava za kontrolo LED diode

loop:
bl LED_ON      // Vklop LED diode

mov r0,#500
bl DELAY // Zakasnitev: r0 x 1msec

bl LED_OFF      // Izlop LED diode

mov r0,#500
bl DELAY // Zakasnitev: r0 x 1msec

b loop          // skok na vrstico loop:


__end: b __end



INIT_IO:
  push {r5, r6, lr}

// Enable GPIOI Peripheral Clock (bit 8 in AHB4ENR register)
ldr r6, = RCC_AHB4ENR      // Load peripheral clock reg address to r6
ldr r5, [r6]                // Read its content to r5
orr r5, #0x00000100          // Set bit 8 to enable GPIOI clock
str r5, [r6]                // Store result in peripheral clock register

// Make GPIOI Pin13 as output pin (bits 27:26 in MODER register)
ldr r6, =GPIOI_BASE      // Load GPIOD BASE address to r6
ldr r5, [r6,#GPIOx_MODER]  // Read GPIOD_MODER content to r5
and r5, #0xF3FFFFFF          // Clear bits 27-26 for P13
orr r5, #0x04000000          // Write 01 to bits 27-26 for P13
str r5, [r6]                // Store result in GPIO MODER register

  pop {r5, r6, pc}



LED_ON:
    push {r5, r6, lr}
// Set GPIOx Pins to 0 (through BSSR register)
ldr    r6, =GPIOI_BASE      // Load GPIOI BASE address to r6
mov    r5, #LEDs_ON
str    r5, [r6,#GPIOx_BSRR] // Write to BSRR register
  pop {r5, r6, pc}

LED_OFF:
    push {r5, r6, lr}
// Set GPIOx Pins to 1 (through BSSR register)
ldr    r6, =GPIOI_BASE      // Load GPIOI BASE address to r6
mov    r5, #LEDs_OFF
str    r5, [r6,#GPIOx_BSRR] // Write to BSRR register
  pop {r5, r6, pc}


// Delay with internal SW loop approx. r0 x ms
DELAY:
    push {r1, lr}

MSEC: ldr r1,=LEDDELAY
LOOP:    subs r1, r1, #1
        bne LOOP

      subs r0, r0, #1
      bne MSEC
    pop {r1, pc}