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PWM

PWM. ECE 4437-Embedded Systems Dr. Glover Christopher Ahn & Khoa Van. What is covered and what is not. Cover: Count down mode and basic configuration to get the motor run. Not cover: Count up/down mode Dead band Interrupt Others. LOAD: Determines PWM period based on system clock.

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PWM

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  1. PWM ECE 4437-Embedded Systems Dr. Glover Christopher Ahn & Khoa Van

  2. What is covered and what is not • Cover: • Count down mode and basic configuration to get the motor run. • Not cover: • Count up/down mode • Dead band • Interrupt • Others

  3. LOAD: Determines PWM period based on system clock ADown/BDown: determine pulsewidth COMPA/COMPB: we set the value to get Adown/BDown

  4. Illustration • Example: System clock is 80[Mhz] (can be reduced). • PWM Clock will be: • 80[Mhz]/64=1.25[Mhz] (period is 0.8 [us]) • We want: • 2[ms] period. What is the Load value? • Answer: LOAD= (2[ms]/0.8[us])-1

  5. Illustration • Now we need to generate pulse width, • We will generate 20% duty cycle for PWMA for this example • HOW? • Easy: LOAD is 100%, so 20%*LOAD is the value for COMPA.

  6. Summary of the Code: • Initialize and enable the Clocks • Enable the PWM Modules • Configure Pin types • Set Duty Cycle • Enable the gate • Enable generators

  7. Coding Example

  8. Can be found on page 489 in: spmu298a_TivaWare_Peripheral_Driver_Lib.pdf

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