QDEC on STM32H563RG with Zephyr

[Lukas4]

Hi all,

I was able to make the qdec on timer1 run and read pulses from an external encoder. Now I wanna generate an interrupt after let's say 100 pulses. That interrupt should toggle a led

I mean the timer has interrupts, but i don't know how to use them in Zephyr.

That is my timerconfig in the devicetree:

tim: &timers1 {
 compatible = "st,stm32-timers";
 reg = <0x40012c00 0x400>;
 clocks = <&rcc STM32_CLOCK(APB2, 11U)>;
 resets = <&rctl STM32_RESET(APB2, 11U)>;
 interrupts = <44 0>;
 interrupt-names = "cc";
 st,prescaler = <0>;
 status = "okay";

 qdec: qdec {
 compatible = "st,stm32-qdec";
 status = "okay";
 pinctrl-0 = <&tim1_ch1_pe9 &tim1_ch2_pe11>;
 pinctrl-names = "default";
 st,input-polarity-inverted;
 st,input-filter-level = <15>; // FDIV32_N8-->15: Fs = F_clk/32, N=8
 st,counts-per-revolution = <700>;
 st,encoder-mode = <1>; //???????
 };
};

 

Code to read the pulses:

 

const struct device *const dev = DEVICE_DT_GET(DT_ALIAS(qdec0));
const struct qdec_stm32_dev_cfg *dev_cfg = (const struct qdec_stm32_dev_cfg *)dev->config;
position = LL_TIM_GetCounter(dev_cfg->timer_inst);
printk("Number of pulses: %" PRIi32 "\n", position);

 

Is cc interrupt the correct one or should I use the "update interrupt"?

 

Do I have to use the counter-module? Zephyr API Documentation: Counter Interface

 

Thank you for your help

Best regards and greetings from Austria
Lukas

[Sarra.S]

Hello @Lukas4, 

The update interrupt is triggered when the counter reaches the ARR value, which you can set to the number of pulses you want to count before the interrupt occurs. 

 

[Lukas4]

Hi @Sarra.S 

 

Sory for my late response. I was busy with other tasks. THank you for your help. 

That means I should use the "Update interrupt" of timer 1. That is pos 42 (prio 50) in the IR vector table.

Can I use the IR-API to init the update interrupt?

IRQ_CONNECT(MY_DEV_IRQ, MY_DEV_PRIO, my_isr, MY_ISR_ARG, MY_IRQ_FLAGS); irq_enable(MY_DEV_IRQ);

Do I have to use the counter_ll_stm32_timer.c lib (zephyr/drivers/counter/counter_ll_stm32_timer.c at main · zephyrproject-rtos/zephyr) to set the ARR register??

 

Best regards

Lukas