rešitev STM32H7
Zahteve zaključka
// STM32H7 Solution
//
// Only newly added/modified parts of the code are below.
// Vector table offset register definition
// Importan for relocated Vector table when running from RAM
.equ VTOR,0xE000ED08
// Start of data section
.data
.align
LEDSTAT: .word 0 // LED state
MSECCNT: .word 0 //MSecs counter for SysTick_Handler
MSECMAX: .word 500 //MSecs interval for SysTick_Handler
main:
bl INIT_IO
// bl INIT_TC
// Relocate vector address - only if you run code from RAM !
ldr r1, =VTOR
ldr r0, =0x24000000
str r0, [r1]
bl INIT_TC_PSP
loop:
b loop
__end: b __end
INIT_TC_PSP:
push {r0, r1, lr}
ldr r1, =SCS_BASE
ldr r0, =SYSTICK_RELOAD_1MS
str r0, [r1, #SCS_SYST_RVR]
mov r0, #0
str r0, [r1, #SCS_SYST_CVR]
mov r0, #0b111 // TickINT Bit also set to 1
str r0, [r1, #SCS_SYST_CSR]
pop {r0, r1, pc}
/**
* @brief This is the code that gets called when SysTick timer triggers interrupt
* @param None
* @retval None
*/
.global SysTick_Handler
.section .text.SysTick_Handler,"ax",%progbits
.type SysTick_Handler, %function
SysTick_Handler:
push {r3, r4, r5, r6, lr}
ldr r3,=MSECMAX // Load MAX value
ldr r5,[r3]
ldr r3,=MSECCNT // Load MSecs Counter value
ldr r4,[r3]
add r4,r4,#1 // Increment (+1)
str r4,[r3]
cmp r4,r5 // End of interval ?
blo RET
// Reset counter state and check LED
mov r4,#0
str r4,[r3]
ldr r3,=LEDSTAT
ldr r4,[r3]
cmp r4,#0
beq LON
mov r5, #LEDs_OFF
mov r4,#0
str r4,[r3]
// mov r7,#0 // set LED status in r7
b CONT
LON: mov r5, #LEDs_ON
mov r4,#0xff
str r4,[r3]
// mov r7,#0xff // set LED status in r7
CONT:
// Set GPIOI Pins through BSRR register
ldr r6, =GPIOI_BASE // Load GPIOD BASE address to r6
str r5, [r6,#GPIOx_BSRR] // Write to BSRR register
RET: pop {r3, r4, r5, r6, pc}
.size SysTick_Handler, .-SysTick_Handler
//
// Only newly added/modified parts of the code are below.
// Vector table offset register definition
// Importan for relocated Vector table when running from RAM
.equ VTOR,0xE000ED08
// Start of data section
.data
.align
LEDSTAT: .word 0 // LED state
MSECCNT: .word 0 //MSecs counter for SysTick_Handler
MSECMAX: .word 500 //MSecs interval for SysTick_Handler
main:
bl INIT_IO
// bl INIT_TC
// Relocate vector address - only if you run code from RAM !
ldr r1, =VTOR
ldr r0, =0x24000000
str r0, [r1]
bl INIT_TC_PSP
loop:
b loop
__end: b __end
INIT_TC_PSP:
push {r0, r1, lr}
ldr r1, =SCS_BASE
ldr r0, =SYSTICK_RELOAD_1MS
str r0, [r1, #SCS_SYST_RVR]
mov r0, #0
str r0, [r1, #SCS_SYST_CVR]
mov r0, #0b111 // TickINT Bit also set to 1
str r0, [r1, #SCS_SYST_CSR]
pop {r0, r1, pc}
/**
* @brief This is the code that gets called when SysTick timer triggers interrupt
* @param None
* @retval None
*/
.global SysTick_Handler
.section .text.SysTick_Handler,"ax",%progbits
.type SysTick_Handler, %function
SysTick_Handler:
push {r3, r4, r5, r6, lr}
ldr r3,=MSECMAX // Load MAX value
ldr r5,[r3]
ldr r3,=MSECCNT // Load MSecs Counter value
ldr r4,[r3]
add r4,r4,#1 // Increment (+1)
str r4,[r3]
cmp r4,r5 // End of interval ?
blo RET
// Reset counter state and check LED
mov r4,#0
str r4,[r3]
ldr r3,=LEDSTAT
ldr r4,[r3]
cmp r4,#0
beq LON
mov r5, #LEDs_OFF
mov r4,#0
str r4,[r3]
// mov r7,#0 // set LED status in r7
b CONT
LON: mov r5, #LEDs_ON
mov r4,#0xff
str r4,[r3]
// mov r7,#0xff // set LED status in r7
CONT:
// Set GPIOI Pins through BSRR register
ldr r6, =GPIOI_BASE // Load GPIOD BASE address to r6
str r5, [r6,#GPIOx_BSRR] // Write to BSRR register
RET: pop {r3, r4, r5, r6, pc}
.size SysTick_Handler, .-SysTick_Handler
Zadnja sprememba: četrtek, 14. december 2023, 13.07