04434 Manual
04434_manual
display_manual
User Manual:
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share awesome hardware 0.96inch OLED User Manual 0.96inch OLED User Manual 1. 2. Key Parameters Driver Chip SSD1306 Interface 3-wire SPI、4-wire SPI、I2C Resolution 128x64 Display Size 0.96 inch Dimension 29mm*33mm Colors Yellow, Blue Visible Angle >160° Operating Temp. (℃) -20℃~70℃ Storage Temp. (℃) -30℃~80℃ Operation Description We will illustrate the usage of the module with an example of 4-wire SPI mode (defaultworking mode) by connecting Waveshare Open103R development board (STM32V MCU onboard). 2.1. Hardwar e configuration This module provides 3 kinds of driver interfaces; they are 3-wire SPI, 4-wire SPI and I2C interface. In its factory settings, BS0/BS1 pins are set to 0/0 and 4-wire SPI is selected as default. Different working mode and pin function of the module can be set by hardware selection on BS0/BS1 pins. (Notice: In this operation, welding is required. Any changes under no guidance from Waveshare will be considered as a waiver of warranty). Table 1: Working mode setting BS1/BS0 CS D/C DIN CLK 3-wire SPI 0/1 CS 0 MOSI SCLK 4-wire SPI 0/0 CS D/C I2C 1/0 0 0/1 SDA SCL 1 th Rev 2.4.1, May 15 2015 0.96inch OLED User Manual share awesome hardware 2.2. Softwar e configuration Open the project file .\IDE\ OLED.uvproj in Keil, navigate to the following text, delete the ‘//’ (Double slash) before #define INTERFACE_4WIRE_SPI //#define INTERFACE_3WIRE_SPI #define INTERFACE_4WIRE_SPI //#define INTERFACE_IIC After compiling successfully, download the project to Open103R development board. Note: You should delete the ‘//’ (Double slash) corresponding to the mode selection 2.3. Hardwar e connections Connect module to the SPI2 interface of Open103R development board, power up. OLED displays information as Figure 1 shows. Figure 1: OLED information display 3. 4-wire SPI and I2C interfaces of SSD1306 OLED This module provides 3 kinds of driver interfaces. We introduce 4-wire SPI and I2C interfaceshere. You can read Chap. 8.1 from SSD1306-Revision_1.1.pdf for more details. The 4-wire serial interface consists of serial clock: SCLK, serial data: SDIN, D/C#, CS#. In 4-wire SPI mode,D0 acts as SCLK, D1 acts as SDIN. For the unused data pins, D2 should be left open. The pins from D3 to D7, E and R/W# (WR#)# can be connected to an external ground. 2 th Rev 2.4.1, May 15 2015 share awesome hardware 0.96inch OLED User Manual Table 2: 4-wire SPI Control pins of 4-wire Serial interface Note (1) H stands for HIGH in signal (2) L stands for LOW in signal SDIN is shifted into an 8-bit shift register on every rising edge of SCLK in the order of D7, D6 ... D0. D/C# is sampled on every eighth clock and the data byte in the shift register is written to the Graphic Display Data RAM (GDDRAM) or command register in the same clock. Under serial mode, only write operations are allowed. Figure 2: Write procedure in 4-wire Serial interface mode The I2C-bus interface gives access to write data and command into the device. Please refer to Figure 2 for the write mode of I2C-bus in chronological order. a) Slave address bit (SA0) SSD1306 has to recognize the slave address before transmitting or receiving any information by the I2C-bus. The device will respond to the slave address following by the slave address bit (“SA0” bit) and the read/write select bit (“R/W#” bit) with the following byte format, b7 b6 b5 b4 b6 b2 b1 b0 0 1 1 1 1 0 SA0 R/W# “SA0” bit provides an extension bit for the slave address. Either “0111100” or 3 th Rev 2.4.1, May 15 2015 0.96inch OLED User Manual share awesome hardware “0111101”, can be selected as the slave address of SSD1306. D/C# pin acts as SA0 for slave address selection. “R/W#” bit is used to determine the operation mode of the I2C-bus interface. R/W#=1, it is in read mode. R/W#=0, it is in write mode. b) I2C-bus data signal (SDA) SDA acts as a communication channel between the transmitter and the receiver. The data and the acknowledgement are sent through the SDA. It should be noticed that the ITO track resistance and the pulled-up resistance at “SDA” pin becomes a voltage potential divider. As a result, the acknowledgement would not be possible to attain a valid logic 0 level in “SDA” ”SDAIN” and “SDAOUT” are tied together and serve as SDA. The “SDAIN” pin must be connected to act as SDA. The “SDAOUT” pin may be disconnected. When “SDAOUT” pin is disconnected, the acknowledgement signal will be ignored in the I2C-bus. c) I2C-bus clock signal (SCL) The transmission of information in the I2C-bus is following a clock signal, SCL. Each transmission of data bit is taken place during a single clock period of SCL. Table 3. I2C I2C-bus data format 1) The slave address is following the start condition for recognition use. For the SSD1306, the slave address is either “b0111100” or “b0111101” by changing the SA0 to LOW or HIGH (D/C pin acts as SA0). 2) The write mode is established by setting the R/W# bit to logic “0” 4 th Rev 2.4.1, May 15 2015 0.96inch OLED User Manual 3) share awesome hardware An acknowledgement signal will be generated after receiving one byte of data, including the slave address and the R/W# bit. 4) After the transmission of the slave address, either the control byte or the data byte may be sent across the SDA. A control byte mainly consists of Co and D/C# bits following by six “0” ‘s. a) If the Co bit is set as logic “0”, the transmission of the following information will contain data bytes only. b) The D/C# bit determines the next data byte is acted as a command or a data. If the D/C# bit is set to logic “0”, it defines the following data byte as a command. If the D/C# bit is set to logic “1”, it defines the following data byte as a data which will be stored at the GDDRAM. The GDDRAM column address pointer will be increased by one automatically after each data write. 5) Acknowledge bit will be generated after receiving each control byte or data byte. 5 th Rev 2.4.1, May 15 2015
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