haaarabia.blogg.se - Stm8 cosmic pwm example

Let us assume that we are using the value of 50,000 for TIM2_ARRH/L as in the last post then by setting TIM2_CCR1H/L to 25,000 will give a duty cycle of 50%. TIM2_ARRH/L are used to determine the period of the signal whilst TIM2_CCR1H/L are used to determine the duty cycle of the signal. These two registers are analogous to the TIM2_ARRH and TIM2_ARRL registers. TIM2_CCR1H & TIM2_CCR1L – Capture/Compare Register 1 High/Low TIM2_CCMR1 – Capture/Compare Mode Register 1.TIM2_CCER1 – Capture/Compare Enable register 1.

TIM2_CCR1H & TIM2_CCR1L – Capture/Compare Register 1 High/Low.

The application will use most of the registers described in the previous post as well as the following: We will then follow up on this by changing the values in the registers to generate a PWM signal with a duty cycle which can be defined by the programmer. So the project definition here is simple to start with, we will generate a square wave without using GPIO ports. It is important that you read and understand the previous post Using Timers on the STM8S before continuing further as we will be using much of the knowledge in that post here. We will also look at how we can manipulate the registers to allow the generation of a PWM pulse from the STM8S by simply changing the register values used to configure the port. In this post we will go one step further and use the capabilities of the timer to generate the pulse directly. There we generated a 20 Hz signal from the STM8S by toggling an output port using direct access to a port configured as an output port. In a recent post we looked at the generation of a square wave signal using a timer and the update/overflow interrupt.