Keil's software logic analyzer (logic analyzer) usage tutorial

Keil's software logic analyzer (logic analyzer) usage tutorial  In Keil MDK, the software logic analyzer has powerful functions, which can analyze digital signals, analog signals, CPU buses (UART, IIC and other output pins), and provide debugging function mechanisms for generating custom signals, such as Sin, triangle waves, bath sound signals, etc., which can be defined.

　　　　Take the stm32 CPU that comes with Keil as an example, track and observe the PWM waveform, open the stm32 Dome in the C:KeilARMBoardsKeilMCBSTM32PWM_2 directory, the first step: perform simulation configuration, as shown in the figure:


 

Open the Abstract.txt file in the project with a description of the project, PWM is output from PB0.8 and PB0.9, and it will be added to the software logic analyzer later. 

The 'PWM' project is a simple program for the STM32F103RBT6 
using Keil 'MCBSTM32' Evaluation Board and demonstrating 
the use of PWM (Pulse Width Modulation) with Timer TIM4 .

Example functionality:                                                   
- Clock Settings:
   - XTAL   =            8.00 MHz
   - SYSCLK   =           72.00 MHz
   - HCLK   = SYSCLK   = 72.00 MHz
   - PCLK1   = HCLK/2   = 36.00 MHz
   - PCLK2   = HCLK   = 72.00 MHz
   - ADCLK   = PCLK2/6 = 12.00 MHz
   - SYSTICK = HCLK/8   =   9.00 MHz

- TIM4 is running at   100Hz.
   LEDs PB8, PB9 are dimmed using the PWM function of TIM4 channel3, channel4

The Timer program is available in different targets:
  Simulator:   - configured for software Simulator
  MCBSTM32:   - runs from Internal Flash located on chip
                 (used for production or target debugging)



Second, select software simulation

 


Third, compile the program. If the program is correct, the following wireframe compilation information will appear, then enter debugging and click the red "D" button, as shown in the figure below

 


Fourth, put the software logic analyzer and drag the waveform signal to be observed into the logic analyzer. If there is no "sysbols" label in the debugging state, click the "View" menu to pop up, and drag the signal to be observed from the "Peripheral Register" (the PWM signal output by GPIOB_IDR will be reflected from this register) into the logic analysis.

 

Fifth, mask the unused bits and display them in bit form. The configuration is shown in the figure

 

Sixth, click the "GO" button to enter full-speed operation. OK, the PWM waveform is out, and the scan time can be adjusted using IN and OUT, as shown in the figure below