【CH579M-R1】+ driving LCD19264 display

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【CH579M-R1】+ driving LCD19264 display [Copy link]

 

I bought two LCD19264 displays from Taobao. After receiving the goods yesterday, I searched for relevant information. Today, I tried to drive them on the CH579M-R1 development board, soldered the pins, connected them with Dupont wires, used the original pins to drive LCD5110, slightly modified the code provided by the manufacturer, and the display was successfully lit. The following picture shows the front view of two LCD19264s connected with Dupont wires, and the back view of the other one that has not been connected:

Here are photos of the testing process:

The test program displays two pictures. The first one is the manufacturer's name, etc., in positive display (white text on a blue background), reverse display (blue text on a white background), rotated 180 degrees, displayed a heart-shaped pattern, rotated 90 degrees, etc. The following is the animation of the test:

Since the merchant did not provide more information, we still need to continue experimenting on how to display the characters.

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There is very little technical information on this 19264 display screen. When searching online, I only found examples of factory display pictures, so I had to figure it out on my own. After many attempts, I finally figured out the driving method of this 19264 display screen and displayed characters. The following figure shows the test process:

The following is a photo of a successful test:

I modified the image data by following the picture display example provided by the manufacturer, changing the first 16 bytes of data to 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0xFF, 0x7F, 0x3F, 0x1F, 0x0F, 0x07, 0x03, 0x01, which is equal to two triangles, one hollow and one solid. The displayed pattern is as follows:

From this pattern, we know that the display order is from left to right, from top to bottom, arranged vertically, with the high byte at the bottom. With these data, we can generate the corresponding font file. However, we encountered problems in setting the display address. The page (row) address setting was relatively smooth, but the column address setting was not smooth. Finally, we observed the display effect by updating the column address once a second. We found that the 1st to 16th columns were displayed normally. When the column address was greater than 16, each time the address was increased by 1, the actual display position was shifted to the right by 4 columns. Further analysis found that the column address was controlled by double bytes. I tried to divide the column address into two parts, the upper 4 bits and the lower 4 bits, and write two bytes respectively. This was successful.

The following figure shows the picture test display effect provided by the manufacturer:

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Qinheng CH579M-R1 Development Board Review

Summary post: https://en.eeworld.com/bbs/thread-1140005-1-1.html