【CY8CPROTO-063-BLE】4. Some GPIO operations

Tristan_C

【CY8CPROTO-063-BLE】4. Some GPIO operations [Copy link]

Some GPIO operations

Through the previous experiences, I have felt that the development environment of Infinenon is indeed powerful and easy to develop. This time, I will experience some GPIO development, starting with the simple ones.

First, open PSoC Creator, select Open a demo, search for PSoC 63 chip, and filter by GPIO. Click to open the second demo code, GPIO_Pins

After creation, the overall framework is as follows

The details of the schematic diagram are shown in the figure below, where the code is:

1. A button is created and connected to P0_4. From the figure, there are no external pull-up and pull-down resistors. It should be necessary to pull it down internally. The high level indicates the pressed state.
2. Two LEDs were created and connected to P0_3 and P11_1 respectively. A 10K resistor was connected to each LED and the LEDs light up when the voltage is high.
3. A global signal is created for the interrupt of Port0, which seems to be used for the button IO, that is, the button uses the interrupt mode.

Here we also reselect the chip model used for the project, that is, the BLE module selected as follows

Let’s go back and look at the project and code

First, look at the code of the M0 and M4 cores respectively.

It can be seen from the code of M0 that it does not contain any content related to executing the application.

The application code is executed on the M4 core.

Looking at the code in detail, the button pin is mainly designed using interrupt mode.

And in the main function, according to the interrupt status, the IO port status of the LED is inverted to control the on and off of the blue LED.

The red LED will remain on or off according to the button status during power-on initialization.

When you try to compile, you will see a lot of error messages. These are all IO port problems. At this time, you need to go back to the hardware correspondence.

According to the actual hardware schematic diagram of the following development board, the design of two LEDs and buttons

Reassign GPIO

Change to

The actual drawing of the button layout changes the rising edge to the falling edge, removes the internal pull-up and pull-down resistors, and uses external pull-up.

Compile and download to the chip.

Then use the button to control the LED to light up.

In fact, it can be seen from here that this chip platform is still very flexible and open. The two cores are basically completely open to users, including the BLE protocol stack. It is also up to the user to choose which core to run on. The degree of openness is still quite sincere.

CE220263_GPIO_Pins01.rar (5.57 MB, downloads: 2)

2024-1-10 19:55 上传

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