Digital IO
Digital I/O infers to a mechanism of directly outputting or inputting logic levels to the pins of the MSP430 Package. It can be used as an apparatus to implement most mechanical devices. Based on the circuit diagram, the pins/ registers used for S3 is the PD2 that is used o witch the LED3 output on and off. Additionally, the pin for LED 2 is the PD% that is turned on or off depending on the Potentiometer input value. The pin for Led 3 is the PD6 used to switch on or off based on the input switch. Lastly, the register that is used for LED 4 is the PD7 that is switched on-off depending on the Controller Area Network (CAN )message.
Next, I used the wizard to make a new dsPIC30F4011 project using MPLAB. I created my project, selected the target CHP from the devises database, and configured them with the appropriate tools. I created the main C file, followed by the other setup. And IOSSetup. H and added them to my project.
Differences between the latches and the Port
The latch refers to the output on which the values are written, whereas the port is the voltage of the real pin. There are some instances where the latch ad the port can differ. The most frequent one is the case where you have a pin unknowingly shorted to the surface. In that case, if the latch is set high, it will read high, but the port will read low since the voltage of the pin will almost be on the ground. Another incident leading to what has been defined is when the port’s pin has not been correctly configured. I once had an encounter trying to figure out why a PIC was not working as anticipated, to finally discovered that I had not switched on the analog module. I have since then learned to go over the part of the I/O ports > PORT?, TRIS?, and LAT? Codes in the datasheet on MATLAB.
Additionally, a read of the latch register usually returns the settings of the output drivers, while readings on the entry often return the logic levels that are detected on the logic levels depicted by the pins. Every port has three registers needed in order to operate as required. These registers include the TRIS register, PORT register as well as the LAt register. In most cases, one reads from the port and writes on the latch.
An example of the differences between the latch and the port is explained as follows in figure 12-1
In the case where an individuals inputs a bit on a digital I/O pin, they store the bit from the Data Bus and also move it to the Data Register, which is also referred to as the D- FlipFlop. If the TRISx of the specified bit is ), the data from Q to the Data Register will be located on I/O pin. Witing in the PORTx or LATx will make the ports act in the same manner as shown in the following highlighted figure.
Is Deboouncing of S3 Required?
Switch debouncing is a regular activity when dealing with digital circuits and switches. If an individual wants to transition a manual switch signal into a digital circuit, they have to debounce the signal so that a single press does not seem like multiple presses.
Flashing LEDs
Program to flash one of the LEDs
Integration of Multiple Functionalities