in our Computer Science class, we are learning to use the STEM32 - Nucleo-L controller, to code assembler. I'm a bit further than the rest of the class, so my teacher tasked me to experiment with the "HAL_Delay" command, since he ran into some problems, trying to use the command.
I found out, that the command usually works fine, except if the registers R2 or/and R3 are use for other stuff. I also found out, that the "wait_ms" command works perfectly fine, so should we just use that command or has anyone got a solution. It would also be very usefull, if someone knew the exact location of the subprogram "HAL_Dealy" in the code.
.syntax unified
.equ L152,1
.include "../Core/src/regs.s"
.global mainasm
mainasm:
main:
bl startup
ldr R1,=GPIOA
ldr R2,=GPIOC
gruenwechsel: //Wechsel von Rot auf Grün
ldr R0,[R2,ODR] //Ampel auf rot setzen
mov R0,#0b1
strb R0,[R2,ODR]
mov R0,#500
bl wait_ms //500ms Warten
ldr R0,[R2,ODR]
mov R0,#0b101 //Rote und Grüne LED geichzeitig an
strb R0,[R2,ODR]
mov R0,#500 //500ms Warten
bl wait_ms
b Gruen //Ampel auf Grün setzen
Gruen: //Grüner Loop
ldr R0,[R2,ODR]
mov R0,#0b10000 //Ampel auf Grün
strb R0,[R2,ODR]
ldr R0,[R1,IDR]
tst R0,Bit10 //Schauen ob PA10 gedrueckt ist
bne rotwechsel //Falls ja, in rotwechsel springen
b Gruen
rotwechsel:
ldr R0,[R2,ODR]
mov R0,#0b00100 //Grüne und Gelbe LED Gleichzeitig an
strb R0,[R2,ODR]
mov R0,#1000 //Warte 1 Sekunde
bl wait_ms
ldr R0,[R2,ODR]
mov R0,#0b00001 //Rote LED an
strb R0,[R2,ODR]
b Rot
Rot: //Roter Loop
ldr R0,[R2,ODR]
mov R0,#0b000001 //LED Rot an
strb R0,[R2,ODR]
ldr R0,[R1,IDR]
tst R0,Bit10 //Schauen ob PA10 gedrückt ist, falls ja, in Grünwechsel springen
bne gruenwechsel
b Rot
.end
Thats my code. If I change the "wait_ms" lines to "HAL_Delay" the code compiles without errors and also loads on to the chip, but it won't do anything, when i press the buttons.
