[BearPi-HM Nano, play with Hongmeng's "touch and pay" function] Part 3: Is the OLED screen lit up?
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1. Introduction
Prepare to make a small demo, communicate with the computer through UDP, and then display the data sent by the computer on the OLED screen. The official IIC routine is provided, so isn't this simple?
2. Design
Before briefly learning the [Hello World] and [LED] routines, you know how to create a Demo. First, implement an OLED Demo and create the required questions, as shown in Figure 1.
Figure 1
Then create the driver layer file.
Figure 2
Then start writing the program. First, we need to create a task to refresh the content of the OLED screen. This article does not use content refresh for the time being, but it will be used in the next article when cooperating with UDP. At that time, the message queue will be used to transmit the content to be displayed, thus combining LiteOS!
Figure 3
Then it is time to modify the driver layer. In fact, it is quite simple. The 51 MCU routines of the OLED screen are already packaged. You only need to modify the IIC communication layer. Figure 4 below shows the main modifications. There is a pit here that stuck me for nearly two hours. Let me share it here. First, after the program is compiled, the software [HiBurn] that downloads the program must re-import the BIN file to be downloaded; another thing is that when IIC assigns data, you cannot assign data to [sendBuf]. Instead, you need to create an array and assign the pointer of the array to [sendBuf]. [sendBuf] is a pointer, not an array! I hope that the friends who play IIC will pay attention to this!
Figure 4
Finally, it’s time to perfect the initialization procedure!
Figure 5
Just connect the screen to the IO00 and IO01 pins.
Figure 6
The final effect is shown in Figure 7.
Figure 7
3. Summary
The overall packaging of BearPi is very good, it is very convenient to call, and it is not difficult to develop. The next article is the combination of UDP and OLED screen. I hope you don’t miss it!
OLED screen source code:
my_iic_oled.zip
(8.41 KB, downloads: 43)
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