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counter_button.fs
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counter_button.fs
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\ this example blinks pc13 after 6(!) raising edges on PA0
$40000000 constant TIM2
TIM2 $0 + constant TIM2_CR1
TIM2 $4 + constant TIM2_CR2
TIM2 $8 + constant TIM2_SMCR
TIM2 $C + constant TIM2_DIER
TIM2 $10 + constant TIM2_SR
TIM2 $14 + constant TIM2_EGR
TIM2 $18 + constant TIM2_CCMR1_Output
TIM2 $18 + constant TIM2_CCMR1_Input
TIM2 $1C + constant TIM2_CCMR2_Output
TIM2 $1C + constant TIM2_CCMR2_Input
TIM2 $20 + constant TIM2_CCER
TIM2 $24 + constant TIM2_CNT
TIM2 $28 + constant TIM2_PSC
TIM2 $2C + constant TIM2_ARR
TIM2 $34 + constant TIM2_CCR1
TIM2 $38 + constant TIM2_CCR2
TIM2 $3C + constant TIM2_CCR3
TIM2 $40 + constant TIM2_CCR4
TIM2 $48 + constant TIM2_DCR
TIM2 $4C + constant TIM2_DMAR
$40010000 constant AFIO
AFIO $0 + constant AFIO_EVCR
AFIO $4 + constant AFIO_MAPR
AFIO $8 + constant AFIO_EXTICR1
AFIO $C + constant AFIO_EXTICR2
AFIO $10 + constant AFIO_EXTICR3
AFIO $14 + constant AFIO_EXTICR4
AFIO $1C + constant AFIO_MAPR2
omode-od pc13 io-mode!
\ 11 constant tim1en
\ tim1en bit RCC-APB2ENR bis! \ enable timer1
\ afio is already enabled
\ 0 constant afioen
\ afioen bit RCC-APB2ENR bis! \ enable afio
\ no afio remapping, we use PA0 for tim2 ch1
imode-float pa0 io-mode!
0 constant tim2en
tim2en bit RCC-APB1ENR bis! \ enable timer2
0 constant cen
cen bit tim2_cr1 bic! \ disable counting
0 tim2_PSC h! \ prescaler
5 tim2_arr h! \ count max
\ external Clock mode 1
%111 tim2_smcr bis!
\ Trigger External input (raising edge since bit 15 is zero)
%1110000 tim2_smcr bis!
\ interupt service routine
0 constant uif
: t2isr
pc13 iox! \ onoff LED
uif bit tim2_sr bic! \ reset irq bit
eint
;
['] t2isr irq-tim2 !
28 constant tim2irq
tim2irq bit nvic_iser0 bis!
0 constant uie
uie bit TIM2_DIER bis! \ enable update interupt on tim2
cen bit tim2_cr1 bis! \ start counting