Posted on January 24, 2013 at 12:14
Hello,
I try to get a ssb1322 oled display working with a stm32f4 board.
The display is NHD-2.8-25664UCY2 from new heaven. The recurrent problem with this display is power, so I power it with an atx 3.3v.
I also use freertos, but it just blink a led on port C. For delay, I use timer5.
I use last ST lib for hardware spi. With multimeter, all lines seems to ok. I receive an oscilloscope tomorow to check that.
Before I want to verify my spi init and using, this is the init (I use different port for SCK and MOSI) :
void prvSPI1_Config()
{
GPIO_InitTypeDef GPIO_InitStructure;
//NVIC_InitTypeDef NVIC_InitStructure;
SPI_InitTypeDef SPI_InitStructure;
/* Peripheral Clock Enable -------------------------------------------------*/
/* Enable the SPI clock */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);
/* Enable GPIO clocks */
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA | RCC_AHB1Periph_GPIOB, ENABLE);
////CS (portA, pin 4) et DC (portA, pin 6)
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4 | GPIO_Pin_6;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
//GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
//GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(GPIOA, &GPIO_InitStructure);
////RESET (portB, pin 6)
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
GPIO_Init(GPIOB, &GPIO_InitStructure);
//This is SSB1322 reset
GPIO_SetBits(GPIOB, GPIO_Pin_7);
OLED_Delay(300);
////SCK (portA pin 5)
GPIO_PinAFConfig(GPIOA, GPIO_PinSource5, GPIO_AF_SPI1);
////MOSI (portB, pin 5)
GPIO_PinAFConfig(GPIOB, GPIO_PinSource5, GPIO_AF_SPI1);
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
//GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_DOWN;
/* SPI SCK pin configuration (portA, pin 5) */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5;
GPIO_Init(GPIOA, &GPIO_InitStructure);
/* SPI MOSI pin configuration (portB, pin 5)*/
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5;
GPIO_Init(GPIOB, &GPIO_InitStructure);
/* SPI configuration -------------------------------------------------------*/
SPI_I2S_DeInit(SPI1);
//SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
SPI_InitStructure.SPI_Direction = SPI_Direction_1Line_Tx;
SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
SPI_InitStructure.SPI_CPOL = SPI_CPOL_High;
SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge;
SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_32; //72/16 = 4.5 Mhz
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
SPI_InitStructure.SPI_CRCPolynomial = 7;
SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
SPI_Init(SPI1, &SPI_InitStructure);
SPI_Cmd(SPI1, ENABLE);
}
And this send functions :
u8 SPI_OLED_SendByte(u8 byte)
{
while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET);
// Send byte through the SPI1 peripheral
SPI_I2S_SendData(SPI1, byte);
}
void oled_Command_25664(unsigned char Data)
{
////CS Low (portA pin 4)
GPIO_ResetBits(GPIOA, GPIO_Pin_4);
/////DC Low (portA pin 6)
GPIO_ResetBits(GPIOA, GPIO_Pin_6);
SPI_OLED_SendByte(Data);
////CS High (portA pin 4)
while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_BSY) == SET);
GPIO_SetBits(GPIOA, GPIO_Pin_4);
}
void oled_Data_25664(unsigned char Data)
{
////CS Low (portA pin 4)
GPIO_ResetBits(GPIOA, GPIO_Pin_4);
/////DC High (portA pin 6)
GPIO_SetBits(GPIOA, GPIO_Pin_6);
SPI_OLED_SendByte(Data);
////CS High (portA pin 4)
while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_BSY) == SET);
GPIO_SetBits(GPIOA, GPIO_Pin_4);
}
Many help ? I begin with stm32, be indulgent ^^
