[Qinheng RISC-V core CH582] 5-SPI drive OLED

manhuami2007

[Qinheng RISC-V core CH582] 5-SPI drive OLED [Copy link]

 

The SPI provided by CH582 supports mode 0 and mode 3, can be configured as 3-wire or 2-wire mode, supports master and slave modes, and supports DMA. SPI also supports FIFO, which is equivalent to 8 data registers. When sending and receiving small amounts of data, even in polling mode, it can improve CPU efficiency. The official SPI library function is quite convenient to use.

The OLED used this time uses the SPI interface, and the pins are:

• MOSI-PA14
• CLK-PA13
• CS-PA12
• RES-PA3
• DC-PA1

When porting the OLED driver, you only need to modify 3 functions:

1. Initialization of peripherals
2. Data Bytes Send
3. Sending command byte

Initialization of peripherals

void oled_spi_init()
{
  GPIOA_SetBits( GPIO_Pin_12 );
  GPIOA_ModeCfg( GPIO_Pin_12 | GPIO_Pin_13 | GPIO_Pin_14, GPIO_ModeOut_PP_5mA );
  SPI0_MasterDefInit();

  GPIOA_ModeCfg(GPIO_Pin_1|GPIO_Pin_3,GPIO_ModeOut_PP_5mA);
  GPIOA_SetBits( GPIO_Pin_1 );
  GPIOA_SetBits( GPIO_Pin_3 );
}

Data and command bytes are sent

void OLED_WR_Byte(uint8_t dat,uint8_t cmd)
{
  uint8_t i;
  if(cmd)
    GPIOA_SetBits(OLED_DC_PIN);
  else
    GPIOA_ResetBits(OLED_DC_PIN);

  GPIOA_ResetBits(OLED_CS_PIN);
  SPI0_MasterSendByte( dat );
  GPIOA_SetBits(OLED_DC_PIN);
}

void OLED_Write_Multi_Data(uint8_t* data,uint16_t len)
{
  uint16_t i;
  GPIOA_SetBits(OLED_DC_PIN);
  GPIOA_ResetBits(OLED_CS_PIN);
  SPI0_MasterTrans( data, len );
  GPIOA_SetBits(OLED_CS_PIN);
}

void OLED_Write_Multi_Cmd(uint8_t* data,uint16_t len)
{
  uint16_t i;
  GPIOA_ResetBits(OLED_DC_PIN);
  GPIOA_ResetBits(OLED_CS_PIN);
  SPI0_MasterTrans( data, len );
  GPIOA_SetBits(OLED_CS_PIN);
  GPIOA_SetBits(OLED_DC_PIN);
}

display image