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00:00:00 – 00:21:42
The video demonstrates how to generate a pulse width modulated (PWM) signal using the MSP430 microcontroller in C programming. The process involves setting timers, creating duty cycles, and utilizing interrupts to control LED flashing for a specific duration. The speaker explains setting up PWM systems, configuring timers, and defining interrupt service routines for smooth operation. Emphasis is placed on accuracy, careful coding, and debugging to ensure successful PWM signal generation. The video concludes by highlighting the significance of understanding the process and encouraging viewers to subscribe to the channel for more content.
00:00:00
In this segment of the video, the focus is on generating a pulse width modulated (PWM) signal using multiple timer compares in programming the MSP430 microcontroller in C. PWM signals have a duty cycle and period, and these signals are commonly used in controlling motors and other devices. To create a PWM signal, two timer compares are used – one to reach the desired duty cycle and another to reset the signal to start a new cycle. This method involves setting the signal to ‘1’, switching it to ‘0’ at the first compare value, and then back to ‘1’ at the second compare value to complete the cycle. This technique is commonly used in electrical and computer engineering applications.
00:03:00
In this part of the video, the speaker discusses setting up a timer system to create a PWM signal using the MSP430’s CCR zero functionality. By utilizing CCR zero in timer up mode, they can easily dictate the PWM period. They explain how to adjust the duty cycle by setting a count value in a separate compare register like CCR one. The example given involves creating a PWM period of 1 second with a 50-millisecond on time. The speaker emphasizes that even a 50-millisecond duration can be visibly seen as a quick flash on an LED. They then calculate the appropriate values to initialize CCR zero and CCR one for the desired PWM signal.
00:06:00
In this part of the video, the speaker discusses setting up a timer to fire interrupt service routines at specific counts. The timer is set up in up mode with default dividers and in 16-bit mode. They load TB0CCR0 with 32,768 and TB0CCR1 with 1638 to generate separate flags and interrupt service routines. It is explained that Timer B0 has two vectors, one for TB0CCR0 and another for TB0CCR1. The speaker sets up ports for toggling LED one and initializes it to 1 for use with a PWM signal.
00:09:00
In this segment of the video, the speaker discusses setting up a PWM (pulse width modulation) system. They start by turning on the digital I/O using a mask called lock L.PM5. Next, they set up timer B0 by configuring it and resetting the counter with TB0CTL and TBCLR. They then set the mode to “up” using TB0CCTL and choose a clock. The compare registers are initialized with specific values, and the PWM period and duty cycle are set for timer B0 CCR0 and CCR1. The speaker emphasizes the importance of defining bit masks and register names from the header file.
00:12:00
In this segment of the video, the focus is on setting up the Timer B (TB) interrupts and configuring the capture compare registers (CCR). The process involves enabling local interrupts for CCR0 and CCR1, enabling global interrupts, and clearing the corresponding flags. It is highlighted that separate configuration registers handle interrupts for CCR0 and CCR1, and this setup allows for triggering two separate interrupts. The presenter completes setting up the LED and timer system.
00:15:00
In this segment of the video, the speaker is preparing to write interrupt service routines. They first focus on CCR zero, initializing a vector table for timer 0 B 0 vector which is related to period 1. They explain the importance of correctly identifying the interrupt service routine and avoiding errors when copying and pasting code. The speaker then sets LED 1 using bitwise operation and clears the flag in the interrupt service routine for CCR zero. They emphasize the need for careful consideration and debugging when working with interrupt service routines. Additionally, they mention transitioning to the interrupt service routine for CCR one.
00:18:00
In this segment of the video, the speaker initializes the vector table with Timer B1 for the ISR’s beauty cycle. They then write an interrupt service routine for CCR1, aiming to turn LED1 off. The routine clears a flag to avoid getting stuck. After checking for typos, they test the setup by flashing LED1, confirming successful pulse width modulation operation.
00:21:00
In this part of the video, the speaker discusses generating a pulse width modulated signal by using a timer and interrupt service routines to flash an LED for 50 milliseconds. They highlight the complexity and achievement of creating this signal. The importance of understanding the process is emphasized, concluding with a mention to support the channel by subscribing.