Developing an LCD driver under RTOS, are you often confused by FSMC timing and pin configuration? Today, using the STM32 + ILI9341 example, I will guide you step by step from 0 to 1, helping you avoid 90% of the pitfalls!
1. First, understand FSMC and 8080, the ILI9341 supports 8080 parallel timing, and the STM32’s FSMC can perfectly simulate it! Just configure the address/data setup time, and you can replace bit-banging, improving efficiency by 3 times!
2. Be careful with pin connections, connect FSMC’s D0-D15 to the LCD data lines, CS/RS/WR/RD to control pins, and remember to pull the RES reset pin low for 5ms before pulling it high!
3. FSMC initialization code, reset NOR/PSRAM 4 blocks → set address setup time to 1 HCLK → data setup time to 4 HCLK → select mode B, address 0x6C000000 (command) / 0x6D000000 (data)!
4. The pixel drawing function is the core, first send 0x2A (column address) → 0x2B (row address) → 0x2C (write memory), then send the RGB565 color! With this, clearing the screen and displaying characters is not difficult!
5. Common debugging issues,– White screen: check the backlight (BK pin pulled low), initialization sequence (ILI9341 requires sending 0x9341 identification code);– Garbled screen: check if the video memory address is correct, or if the FSMC timing matches!
#LCD#LCD driver#display driver#TFT driver#easy to come#Junqi (LCD old revolutionary)