stm32 spi2 屏幕刷新慢的问题

catbal · 发表于 2023-11-14 15:24:30

使用mimi板做个一个spi屏幕驱动，发现一个问题，我把mini板上得8M晶振去掉后发现屏幕刷新很慢，求大佬指点：附上部分源码
spi使用的是spi2
void SPI2_Init(void)
{
SPI_InitTypeDef  SPI_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;

//配置SPI2管脚
RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO|RCC_APB2Periph_GPIOB, ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13 | GPIO_Pin_15;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(GPIOB, &GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_14;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);

//SPI2配置选项
RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2 ,ENABLE);

SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low;
SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge;
SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_2;
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
SPI_InitStructure.SPI_CRCPolynomial = 7;
SPI_Init(SPI2, &SPI_InitStructure);

//使能SPI2
SPI_Cmd(SPI2, ENABLE);
}

void LCD_Init(void)
{
SPI2_Init(); //硬件SPI2初始化
LCD_GPIOInit();//LCD GPIO初始化
LCD_RESET(); //LCD 复位
//************* ILI9488初始化**********//
.......
}

int main(void)
{
SystemInit();//初始化RCC 设置系统主频为72MHZ
delay_init(72);       //延时初始化
LCD_Init();    //液晶屏初始化
  //循环测试
DrawTestPage("test");
Gui_StrCenter(0,30,RED,BLUE,"test1",16,1);//居中显示
while(1)
{
main_test(); //测试主界面

}
}