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Raspberry Pi Display 2.9inch E-Paper / E-Ink Module for Raspberry Pi Pico, 296 x 128, Black / White, SPI

NOTE: Raspberry Pi Pico is NOT included. The pictures are for reference ONLY. 2.9inch E-Paper E-Ink Display Module For Raspberry Pi Pico, 296x128 Pixels, Black / White, SPI Interface

SPI Timing:

Note: Different from the traditional SPI protocol, the data line from the slave to the master is hidden since the device only has a display requirement.

• CS is slave chip select, when CS is low, the chip is enabled.
• DC is data/command control pin, when DC = 0, write command, when DC = 1, write data.
• SCLK is the SPI communication clock.
• SDIN is the data line from the master to the slave in SPI communication. SPI communication has data transfer timing, which is combined by CPHA and CPOL.

1. CPOL determines the level of the serial synchronous clock at an idle state. When CPOL = 0, the level is Low. However, CPOL has little effect on the transmission.
2. CPHA determines whether data is collected at the first clock edge or at the second clock edge of the serial synchronous clock; when CPHL = 0, data is collected at the first clock edge.

• There are 4 SPI communication modes. SPI0 is commonly used, in which CPHL = 0, CPOL = 0. As you can see from the figure above, data transmission starts at the first falling edge of SCLK, and 8 bits of data are transferred in one clock cycle. Here, SPI0 is in used, and data is transferred by bits, MSB first. Working Protocol This product is an E-paper device adopting the image display technology of Microencapsulated Electrophoretic Display, MED. The initial approach is to create tiny spheres, in which the charged color pigments are suspending in the transparent oil and would move depending on the electronic charge