In the previous example, ILI93XX modules have been added in ASF, and related statements are made. This time you do a good job in the SMC, then use the API provided by ASF to print "Hello World!" On the screen.
First, circuit diagram
The wiring of the LCD connector of the development board is shown. All of these connectors are connected in accordance with the function of the SMC corresponding pin, which is clear that SMC comes with the LCD interact.
There are two pins that require attention:
The peripheral A of the PD18 pin is NCS1, i.e., the LCD is connected to the slice selection device 1 of the SMC.
The RS line represents "Register Selection", depending on the different levels of this pin, you will choose to access different registers. The peripheral of the PC19 pin is the address line A1, which will be described later.
Second, the interaction of SMC and LCD controller
When interacting with some storage devices, there is a more complex timing. For example, when writing to the register of the LCD controller:
Moreover, the difference between the level of the lead level is also specified.
If you use SMC, you will automatically complete these timings automatically after doing the appropriate configuration. Also, the chip maps a piece of address. When accessing the address of the corresponding interval, it will be submitted to the SMC to complete the actual access work:
The LCD controller is a chip selection device 1 of the SMC, so it is actually accessed to the LCD controller when the access address is in the interval [0x6100 0000, 0x61FF fff]. The RS is connected to the data line A1, so depending on the first bit of the access address, it will affect the high and low of the RS pin level depending on the first bit (from 0). If the RS is low at the access address 0x6100 0000, it is high when the 0x6100 0002 is accessed.
Third, SMC timing settings
The corresponding timing can be found on the chip manual of the LCD controller:
When the MCK is 96 MHz, set it as follows:
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#define ili93xx_lcd_cs 1
#define SMC_CS SMC->SMC_CS_NUMBER [ili93xx_lcd_cs]
/ * If you use the ASF's PMC module, call this to enable your peripheral clock * /
PMC_ENABLE_PERIPH_CLK (ID_SMC);
SMC_CS.SMC_SETUP =
SMC_SetUp_nwe_setup (1)
| SMC_SETUP_NCS_WR_SETUP (1)
| SMC_SETUP_NRD_SETUP (1)
| SMC_SETUP_NCS_RD_SETUP (1);
SMC_CS.SMC_PULSE =
SMC_PULSE_NWE_PULSE (5)
| SMC_PULSE_NCS_WR_PULSE (5)
| SMC_PULSE_NRD_PULSE (15)
| SMC_PULSE_NCS_RD_PULSE (15);
SMC_CS.SMC_CYCLE =
SMC_CYCLE_NWE_CYCLE (10)
| SMC_CYCLE_NRD_CYCLE (300);
/ * Controlled by NRD or NWE signal * /
SMC_CS.SMC_MODE =
SMC_MODE_READ_MODE
| SMC_MODE_WRITE_MODE;
This setting does not have to be too strict, such as the settings in the ASF sample code and this a bit gap, but can run successfully. In addition, the sample code in the ASF is also a good learning material. Open sample items in Atmel Studio's Start Page:
Fourth, the use of the LCD module
In Conf_Board.h, you can see there are two configuration items. In general, these two configurations have been defined in the development board support module. However, after reading the previous section, you should also know that it makes so configured.
Since this LCD controller is slightly complex (its chip manual has more than 100 pages), and the ASF has implemented the relevant module, so this will continue to use ASF.
In ILI93XX, many control and drawing modules are implemented, and an English-language library is also included, which can be easily illustrated for basic graphics and English.
The initialization of LCD.
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Structili93xx_opt_t lcd_init_opt;
LCD_INIT_OPT.UL_WIDTH = ILI93XX_LCD_WIDTH;
LCD_INIT_OPT.UL_HEIGHT = ILI93XX_LCD_HEIGHT;
LCD_INIT_OPT.FOREGROUND_COLOR = Color_Black;
LCD_INIT_OPT.BACKGROUND_COLOR = Color_White;
/ * Initializing LCD * /
ILI93XX_INIT (& LCD_INIT_OPT);
/ * Start LCD * /
ILI93XX_DISPLAY_ON ();
Pack the screen as a sky blue.
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/ * The pixel format is Argb-888 * /
Constuint32_t sky_blue_rgb = 0x87ceeb;
ILI93XX_SET_FOREGROUND_COLOR (SKY_BLUE_RGB);
ILI93XX_DRAW_FILLED_RECTANGLE (0, 0, ILI93XX_LCD_WIDTH, ILI93XX_LCD_HEIGHT);
Draw a text.
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/ * Draw text * /
ILI93XX_SET_FOREGROUND_COLOR (color_black);
ILI93XX_DRAW_STRING (50, 150, (uint8_t *) "Hello World!");
There are many other APIs, such as controlling display or more, you can view the API document or the corresponding header file.
Edit: hfy, read full text
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