图片显示原理w25x16一次读取出5000个像素点,然后一次向彩屏中写入5000个点。但是刷屏速度比较2.4寸的显示屏需要0.5左右。采用的
单片机是
STM32f030.有人解决过这个方案?或者谁懂如何提高spi的
通信速度?spi初始化程序如下:/*******************************************************************************
* Func
tion Name : SPI_FLASH_Init
* Description : Initializes the peripherals used by the SPI FLASH driver.
* Input : None
* Output : None
* Return : None
*******************************************************************************/
void SPI_FLASH_Init(void)
{
GPIO_InitTypeDef GPIO_InitStruct;
SPI_InitTypeDef SPI_InitStruct;
/*!< SD_SPI_CS_GPIO, SD_SPI_MOSI_GPIO, SD_SPI_MISO_GPIO, SD_SPI_DETECT_GPIO
and SD_SPI_SCK_GPIO Periph clock enable */
// RCC_AHBPeriphClockCmd(FLASH_CS_PIN_SCK|FLASH_SCK_PIN_SCK|FLASH_MISO_PIN_SCK | FLASH_MOSI_PIN_SCK, ENABLE);
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOF| RCC_AHBPeriph_GPIOB, ENABLE);
/*!< SD_SPI Periph clock enable */
RCC_APB1PeriphClockCmd(FLASH_SPI2, ENABLE);
/*!< Configure SD_SPI pins: SCK */
GPIO_InitStruct.GPIO_Pin = FLASH_SCK_PIN;
GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStruct.GPIO_Speed = GPIO_Speed_Level_3;
GPIO_InitStruct.GPIO_OType = GPIO_OType_PP;
GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_Init(FLASH_SCK_PORT, &GPIO_InitStruct);
/*!< Configure SD_SPI pins: MISO */
GPIO_InitStruct.GPIO_Pin = FLASH_MISO_PIN;
GPIO_Init(FLASH_MISO_PORT, &GPIO_InitStruct);
/*!< Configure SD_SPI pins: MOSI */
GPIO_InitStruct.GPIO_Pin =FLASH_MOSI_PIN;
GPIO_Init(FLASH_MOSI_PORT, &GPIO_InitStruct);
/* Connect PXx to SD_SPI_SCK */
GPIO_PinAFConfig(FLASH_SCK_PORT, FLASH_SCK_SOURCE, FLASH_SCK_AF);
/* Connect PXx to SD_SPI_MISO */
GPIO_PinAFConfig(FLASH_MISO_PORT, FLASH_MISO_SOURCE, FLASH_MISO_AF);
/* Connect PXx to SD_SPI_MOSI */
GPIO_PinAFConfig(FLASH_MOSI_PORT, FLASH_MOSI_SOURCE, FLASH_MOSI_AF);
/*!< Configure SD_SPI_CS_PIN pin: SD Card CS pin */
GPIO_InitStruct.GPIO_Pin =FLASH_CS_PIN;
GPIO_InitStruct.GPIO_Mode = GPIO_Mode_OUT;
GPIO_InitStruct.GPIO_OType = GPIO_OType_PP;
GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_InitStruct.GPIO_Speed = GPIO_Speed_Level_3;
GPIO_Init(FLASH_CS_PORT, &GPIO_InitStruct);
SPI_FLASH_CS_HIGH();
/*!< SD_SPI Config */
SPI_InitStruct.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
SPI_InitStruct.SPI_Mode = SPI_Mode_Master;
SPI_InitStruct.SPI_DataSize = SPI_DataSize_8b;
SPI_InitStruct.SPI_CPOL = SPI_CPOL_High;
SPI_InitStruct.SPI_CPHA = SPI_CPHA_2Edge;
SPI_InitStruct.SPI_NSS = SPI_NSS_Soft;
// SPI_InitStruct.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_16;
SPI_InitStruct.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_2;
SPI_InitStruct.SPI_FirstBit = SPI_FirstBit_MSB;
SPI_InitStruct.SPI_CRCPolynomial = 7;
SPI_Init(SPI2, &SPI_InitStruct);
SPI_RxFIFOThresholdConfig(SPI2, SPI_RxFIFOThreshold_QF);
SPI_Cmd(SPI2, ENABLE); /*!< SD_SPI enable */
}
w25x16的读取程序如下:
/*******************************************************************************
* Function Name : SPI_FLASH_BufferRead
* Description : Reads a block of data from the FLASH.
* Input : - pBuffer : pointer to the buffer that receives the data read
* from the FLASH.
* - ReadAddr : FLASH's internal address to read from.
* - NumByteToRead : number of bytes to read from the FLASH.
* Output : None
* Return : None
*******************************************************************************/
void SPI_FLASH_BufferRead(uint8_t* pBuffer, uint32_t ReadAddr, uint16_t NumByteToRead)
{
/* Select the FLASH: Chip Select low */
SPI_FLASH_CS_LOW();
/* Send "Read from Memory " instruction */
SPI_FLASH_SendByte(W25X_ReadData);
/* Send ReadAddr high nibble address byte to read from */
SPI_FLASH_SendByte((ReadAddr & 0xFF0000) >> 16);
/* Send ReadAddr medium nibble address byte to read from */
SPI_FLASH_SendByte((ReadAddr& 0xFF00) >> 8);
/* Send ReadAddr low nibble address byte to read from */
SPI_FLASH_SendByte(ReadAddr & 0xFF);
while (NumByteToRead--) /* while there is data to be read */
{
/* Read a byte from the FLASH */
*pBuffer = SPI_FLASH_SendByte(Dummy_Byte);
/* Point to the next location where the byte read will be saved */
pBuffer++;
}
/* Deselect the FLASH: Chip Select high */
SPI_FLASH_CS_HIGH();
}
附件是w25x16的驱动程序
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w25x16_drive.zip
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