[Perf-V Evaluation] On-chip Temperature Collection
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The routines provided with the development board provide an example of on-chip temperature acquisition, through which we can learn about A/D acquisition.
In addition, since the driving display content of the LCD1602 liquid crystal screen in I2C mode is also designed in the routine, it is also helpful to design the corresponding display driver.
The on-chip temperature acquisition routine consists of four modules, namely: TOP module, LCD module, I2C module and TEMP_DESIGN_INIT module.
The hardware circuit structure is shown in Figure 1, where sda and scl are used to drive the LCD1602 liquid crystal screen, and key1 and key2 are used to control the display content of the liquid crystal screen.
Figure 1 Hardware circuit structure
After compilation, the corresponding *.bit file is generated, and the download interface is shown in Figure 2.
Figure 2 Program download
When the program is running, the data curve of the on-chip temperature can be observed through the system waveform display serial port, as shown in Figure 3.
Figure 3 Temperature curve
According to the introduction of the routine, this program supports the LCD1602 LCD screen running in I2C mode. Its connection relationship with the development board is:
SDA----B11
SCL----B10
Its connection with the development board is shown in Figure 4. The LCD screen is powered by 5V.
Figure 4 LCD1602 connection form
Unfortunately, although the LCD screen displays well when tested on other development boards, no temperature value is displayed when driven by the routine, as shown in Figure 5.
The effect that should be achieved should be the effect of Figure 6. I don't know why it appears and how to change it. I hope the manufacturer can help.
Figure 5 Operation effect
Figure 6 Ideal effect
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