网站后台下载图片,推广排名,外包服务费税率,搬瓦工建立wordpress本文实现DMA快速显示文字 汉字点阵通常是16*16点阵#xff0c;那么用DMA一次性显示汉字#xff0c;应该至少申请480*16个字节的空间#xff0c;用于显示一行文字#xff0c;其中480是屏幕一行用DMA驱动所需内存。 一、 源码
HX8347.h
#ifndef USER_HX8347_H_
#define USE… 本文实现DMA快速显示文字 汉字点阵通常是16*16点阵那么用DMA一次性显示汉字应该至少申请480*16个字节的空间用于显示一行文字其中480是屏幕一行用DMA驱动所需内存。 一、 源码
HX8347.h
#ifndef USER_HX8347_H_
#define USER_HX8347_H_#define SPI_hardware
#define SPI_hardware_dma#define Buf_Size 480*16#define X_MAX_PIXEL 240
#define Y_MAX_PIXEL 320#define RED 0xf800
#define GREEN 0x07e0
#define BLUE 0x001f
#define WHITE 0xffff
#define BLACK 0x0000
#define YELLOW 0xFFE0
#define GRAY0 0xEF7D //灰色0 3165 00110 001011 00101
#define GRAY1 0x8410 //灰色1 00000 000000 00000
#define GRAY2 0x4208 //灰色2 1111111111011111#ifdef SPI_hardware#define LCD_CS GPIO_Pin_0 // CS:PA0#define LCD_SDA GPIO_Pin_7 // SDA:PA7 SPI1 //硬件SPI实现不用人工处理#define LCD_SCL GPIO_Pin_5 // SCL:PA5 SPI1 //硬件SPI实现不用人工处理#define LCD_RST GPIO_Pin_4 // RST:PA4
#else#define LCD_CS GPIO_Pin_0 // CS:PA0#define LCD_SDA GPIO_Pin_1 // SDA:PA1#define LCD_SCL GPIO_Pin_3 // SCL:PA3#define LCD_RST GPIO_Pin_4 // RST:PA4
#endif#define LCD_SCL_SET GPIO_WriteBit(GPIOA, LCD_SCL,Bit_SET)
#define LCD_SDA_SET GPIO_WriteBit(GPIOA, LCD_SDA,Bit_SET)
#define LCD_CS_SET GPIO_WriteBit(GPIOA, LCD_CS,Bit_SET)
#define LCD_RST_SET GPIO_WriteBit(GPIOA, LCD_RST,Bit_SET)#define LCD_SCL_CLR GPIO_WriteBit(GPIOA, LCD_SCL,Bit_RESET)
#define LCD_SDA_CLR GPIO_WriteBit(GPIOA, LCD_SDA,Bit_RESET)
#define LCD_CS_CLR GPIO_WriteBit(GPIOA, LCD_CS,Bit_RESET)
#define LCD_RST_CLR GPIO_WriteBit(GPIOA, LCD_RST,Bit_RESET)void LCD_GPIO_Init(void);
void Lcd_WriteIndex(unsigned char Index);
void Lcd_WriteData(unsigned char Data);
void LCD_WriteData_16Bit(unsigned int Data);
void Lcd_Write_REG(unsigned char Index,unsigned char Data);
void LCD_Init(void);
void Lcd_Clear(unsigned int Color);
void FillRect(u16 x1, u16 y1, u16 x2, u16 y2, u16 color);
void FillRect_DMA(u16 color);void Gui_DrawFont_GBK16(unsigned int x, unsigned int y, unsigned int fc, unsigned int bc, unsigned char *s);
void Gui_DrawFont_GBK16_DMA(unsigned int x, unsigned int y, unsigned int fc, unsigned int bc,unsigned char *s);#endif /* USER_HX8347_H_ */HX8347.c
#include debug.h
#include HX8347.h
#include font.hextern unsigned char TxData[];
extern void MYDMA_Enable(DMA_Channel_TypeDef*DMA_CHx);void LCD_GPIO_Init(void)
{GPIO_InitTypeDef GPIO_InitStructure {0};RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
#ifdef SPI_hardwareGPIO_InitStructure.GPIO_Pin LCD_CS|LCD_RST;
#elseGPIO_InitStructure.GPIO_Pin LCD_SCL|LCD_SDA|LCD_CS|LCD_RST;
#endifGPIO_InitStructure.GPIO_Mode GPIO_Mode_Out_PP;GPIO_InitStructure.GPIO_Speed GPIO_Speed_50MHz;GPIO_Init(GPIOA, GPIO_InitStructure);
}//向SPI总线传输一个8位数据void SPI_WriteData(unsigned char Data)
{
#ifdef SPI_hardwareSPI_I2S_SendData( SPI1, Data);while( SPI_I2S_GetFlagStatus( SPI1, SPI_I2S_FLAG_TXE ) RESET );//Delay_Us(1);uint32_t i;SysTick-SR ~(1 0);i 8;SysTick-CMP i;SysTick-CTLR | (1 4);SysTick-CTLR | (1 5) | (1 0);while((SysTick-SR (1 0)) ! (1 0));SysTick-CTLR ~(1 0);#elseunsigned char i0;for(i8;i0;i--){if(Data0x80)LCD_SDA_SET; //输出数据else LCD_SDA_CLR;LCD_SCL_CLR;LCD_SCL_SET;Data1;}
#endif
}//向液晶屏写一个8位指令void Lcd_WriteIndex(unsigned char Index)
{//SPI 写命令时序开始LCD_CS_CLR;SPI_WriteData(0x70);SPI_WriteData(Index);LCD_CS_SET;
}//向液晶屏写一个8位数据void Lcd_WriteData(unsigned char Data)
{LCD_CS_CLR;SPI_WriteData(0x72);SPI_WriteData(Data);LCD_CS_SET;
}//向液晶屏写一个16位数据
void LCD_WriteData_16Bit(unsigned int Data)
{LCD_CS_CLR;SPI_WriteData(0x72);SPI_WriteData(Data8);SPI_WriteData(Data);LCD_CS_SET;
}void Lcd_Write_REG(unsigned char Index,unsigned char Data)
{Lcd_WriteIndex(Index);Lcd_WriteData(Data);
}void Lcd_Reset(void)
{LCD_RST_CLR;Delay_Ms(50);LCD_RST_SET;Delay_Ms(50);
}// set region to paint
void LCD_SetWindow(unsigned int x1,unsigned int y1,unsigned int x2,unsigned int y2)
{//SCLcd_Write_REG(0x02,x18); // Column address start2Lcd_Write_REG(0x03,(u8)x1); // Column address start1//ECLcd_Write_REG(0x04,x28); // Column address end2Lcd_Write_REG(0x05,(u8)x2); // Column address end1//SPLcd_Write_REG(0x06,y18); // Row address start2Lcd_Write_REG(0x07,(u8)y1); // Row address start1//EPLcd_Write_REG(0x08,y28); // Row address end2Lcd_Write_REG(0x09,(u8)y2); // Row address end1//写0x22到index register那么下次send data就会直接被写到graphic ramLcd_WriteIndex(0x22);
}void FillRect(u16 x1, u16 y1, u16 x2, u16 y2, u16 color)
{LCD_SetWindow(x1, y1,x2,y2);x2 x2 - x1 1;y2 y2 - y1 1;LCD_CS_CLR;SPI_WriteData(0x72);for(x1 x2; x1 ! 0 ; x1--){for (y1 y2;y1 ! 0 ;y1--){SPI_WriteData(color8);SPI_WriteData(color);}}LCD_CS_SET;
}void FillRect_DMA(u16 color)
{int16_t j;LCD_SetWindow(0, 0,239,319);LCD_CS_CLR;SPI_WriteData(0x72);for(j0 ;jBuf_Size;){TxData[j] color8;TxData[j1] color;j 2;}for(j 0 ; j320/(Buf_Size/480) ; j){SPI_I2S_DMACmd(SPI1,SPI_I2S_DMAReq_Tx,ENABLE);MYDMA_Enable(DMA1_Channel3);while(1){if(DMA_GetFlagStatus(DMA1_FLAG_TC3)!RESET){DMA_ClearFlag(DMA1_FLAG_TC3);break;}}}LCD_CS_SET;
}void LCD_Init(void)
{//LCD_GPIO_Init();Lcd_Reset();Lcd_Write_REG(0x18,0x88); //UADJ 75HzLcd_Write_REG(0x19,0x01); //OSC_EN1, start Osc//Power Voltage SettingLcd_Write_REG(0x1B,0x1e); //VRH4.60V 0x1eLcd_Write_REG(0x1C,0x04); //AP Crosstalk 04Lcd_Write_REG(0x1A,0x01); //BT (VGH~15V,VGL~-10V,DDVDH~5V) 0x01Lcd_Write_REG(0x24,0x21); //VMH 27 0x38Lcd_Write_REG(0x25,0x5F); //VML//VCOM offsetLcd_Write_REG(0x23,0x8C); //for Flicker adjustLcd_Write_REG(0x1F,0x88);// GAS1, VOMG00, PON0, DK1, XDK0, DVDH_TRI0, STB0Delay_Ms(50);Lcd_Write_REG(0x1F,0x80);// GAS1, VOMG00, PON0, DK0, XDK0, DVDH_TRI0, STB0Delay_Ms(50);Lcd_Write_REG(0x1F,0x90);// GAS1, VOMG00, PON1, DK0, XDK0, DVDH_TRI0, STB0Delay_Ms(50);Lcd_Write_REG(0x1F,0xD0);// GAS1, VOMG10, PON1, DK0, XDK0, DDVDH_TRI0, STB0Delay_Ms(50);//Display ON SettingLcd_Write_REG(0x28,0x38); //GON1, DTE1, D1000Delay_Ms(50);Lcd_Write_REG(0x28,0x3C); //GON1, DTE1, D1100Lcd_Write_REG(0x36,0x09); //REV, BGRLcd_Write_REG(0x17,0x05); //16BIT/PIXEL//Gamma 2.2 SettingLcd_Write_REG(0x40,0x00); //Lcd_Write_REG(0x41,0x00); //Lcd_Write_REG(0x42,0x00); //Lcd_Write_REG(0x43,0x11); //Lcd_Write_REG(0x44,0x0e); //Lcd_Write_REG(0x45,0x23); //Lcd_Write_REG(0x46,0x08); //Lcd_Write_REG(0x47,0x53); //Lcd_Write_REG(0x48,0x03); //Lcd_Write_REG(0x49,0x11); //Lcd_Write_REG(0x4A,0x18); //Lcd_Write_REG(0x4B,0x1a); //Lcd_Write_REG(0x4C,0x16); //Lcd_Write_REG(0x50,0x1c); //Lcd_Write_REG(0x51,0x31); //Lcd_Write_REG(0x52,0x2e); //Lcd_Write_REG(0x53,0x3f); //Lcd_Write_REG(0x54,0x3f); //Lcd_Write_REG(0x55,0x3f); //Lcd_Write_REG(0x56,0x2c); //Lcd_Write_REG(0x57,0x77); //Lcd_Write_REG(0x58,0x09); //Lcd_Write_REG(0x59,0x05); //Lcd_Write_REG(0x5A,0x07); //Lcd_Write_REG(0x5B,0x0e); //Lcd_Write_REG(0x5C,0x1c); //Lcd_Write_REG(0x5D,0x88); //Delay_Ms(100);FillRect(0, 0, 239, 319, RED );
}/*************************************************
函数名LCD_DrawPoint
功能画一个点
入口参数无
返回值无
*************************************************/
void Gui_DrawPoint(unsigned int x,unsigned int y,unsigned int Data)
{LCD_SetWindow(x,y,x1,y1);LCD_WriteData_16Bit(Data);
}void Gui_DrawPoint_DMA(unsigned int x,unsigned int y,unsigned int Data)
{//LCD_SetWindow(x,y,x1,y1);//LCD_WriteData_16Bit(Data);TxData[2*xy*480]Data8;TxData[2*xy*4801]Data;}void DMA_BUFFER_RESET(unsigned int bc)
{unsigned int j;for(j0 ;jBuf_Size;){TxData[j] bc8;TxData[j1] bc;j 2;}
}void Gui_DrawFont_GBK16(unsigned int x, unsigned int y, unsigned int fc, unsigned int bc,unsigned char *s)
{unsigned char i,j;unsigned short k,x0;x0x;while(*s){if((*s) 128){k*s;if (k13){xx0;y16;}else{if (k32) k-32; else k0;for(i0;i16;i)for(j0;j8;j){if(asc16[k*16i](0x80j)) Gui_DrawPoint(xj,yi,fc);else{if (fc!bc) Gui_DrawPoint(xj,yi,bc);}}x8;}s;}else{for (k0;khz16_num;k){if ((hz16[k].Index[0]*(s))(hz16[k].Index[1]*(s1))){for(i0;i16;i){for(j0;j8;j){if(hz16[k].Msk[i*2](0x80j)) Gui_DrawPoint(xj,yi,fc);else {if (fc!bc) Gui_DrawPoint(xj,yi,bc);}}for(j0;j8;j){if(hz16[k].Msk[i*21](0x80j)) Gui_DrawPoint(xj8,yi,fc);else{if (fc!bc) Gui_DrawPoint(xj8,yi,bc);}}}}}s2;x16;}}
}void Gui_DrawFont_GBK16_DMA(unsigned int x, unsigned int y, unsigned int fc, unsigned int bc,unsigned char *s)
{unsigned char i,j;unsigned short k,x0,y0;x0x;y0y;x0;y0;DMA_BUFFER_RESET(bc); //清缓存while(*s){if((*s) 128){k*s;if (k13){xx0;y16;}else{if (k32) k-32; else k0;for(i0;i16;i)for(j0;j8;j){if(asc16[k*16i](0x80j)) Gui_DrawPoint_DMA(xj,yi,fc);else{if (fc!bc) Gui_DrawPoint_DMA(xj,yi,bc);}}x8;}s;}else{for (k0;khz16_num;k){if ((hz16[k].Index[0]*(s))(hz16[k].Index[1]*(s1))){for(i0;i16;i){for(j0;j8;j){if(hz16[k].Msk[i*2](0x80j)) Gui_DrawPoint_DMA(xj,yi,fc);else {if (fc!bc) Gui_DrawPoint_DMA(xj,yi,bc);}}for(j0;j8;j){if(hz16[k].Msk[i*21](0x80j)) Gui_DrawPoint_DMA(xj8,yi,fc);else{if (fc!bc) Gui_DrawPoint_DMA(xj8,yi,bc);}}}}}s2;x16;}}LCD_SetWindow(0,y0,239,y016);LCD_CS_CLR;SPI_WriteData(0x72);SPI_I2S_DMACmd(SPI1,SPI_I2S_DMAReq_Tx,ENABLE);MYDMA_Enable(DMA1_Channel3);while(1){if(DMA_GetFlagStatus(DMA1_FLAG_TC3)!RESET){DMA_ClearFlag(DMA1_FLAG_TC3);break;}}LCD_CS_SET;}main.c
/********************************** (C) COPYRIGHT *******************************
* File Name : main.c
* Author : WCH
* Version : V1.0.0
* Date : 2021/06/06
* Description : Main program body.
*********************************************************************************
* Copyright (c) 2021 Nanjing Qinheng Microelectronics Co., Ltd.
* Attention: This software (modified or not) and binary are used for
* microcontroller manufactured by Nanjing Qinheng Microelectronics.
*******************************************************************************//**NoteGPIO routine:PA0 push-pull output.*/#include debug.h
#include HX8347.h/* Global define *//* Global Variable */unsigned char TxData[Buf_Size]{0};
u16 DMA1_MEM_LEN;/********************************************************************** fn GPIO_Toggle_INIT** brief Initializes GPIOA.0** return none*/
void GPIO_Toggle_INIT(void)
{GPIO_InitTypeDef GPIO_InitStructure {0};RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);GPIO_InitStructure.GPIO_Pin GPIO_Pin_13;GPIO_InitStructure.GPIO_Mode GPIO_Mode_Out_PP;GPIO_InitStructure.GPIO_Speed GPIO_Speed_50MHz;GPIO_Init(GPIOB, GPIO_InitStructure);
}void SPI_1Lines_HalfDuplex_Init(void)
{GPIO_InitTypeDef GPIO_InitStructure{0};SPI_InitTypeDef SPI_InitStructure{0};RCC_APB2PeriphClockCmd( RCC_APB2Periph_SPI1|RCC_APB2Periph_GPIOA, ENABLE );GPIO_InitStructure.GPIO_Pin GPIO_Pin_5;GPIO_InitStructure.GPIO_Mode GPIO_Mode_AF_PP;GPIO_InitStructure.GPIO_Speed GPIO_Speed_50MHz;GPIO_Init( GPIOA, GPIO_InitStructure );GPIO_InitStructure.GPIO_Pin GPIO_Pin_7;GPIO_InitStructure.GPIO_Mode GPIO_Mode_AF_PP;GPIO_InitStructure.GPIO_Speed GPIO_Speed_50MHz;GPIO_Init( GPIOA, GPIO_InitStructure );SPI_InitStructure.SPI_Direction SPI_Direction_1Line_Tx;SPI_InitStructure.SPI_Mode SPI_Mode_Master;SPI_InitStructure.SPI_DataSize SPI_DataSize_8b;SPI_InitStructure.SPI_CPOL SPI_CPOL_Low; //在空闲状态下时钟线保持高电平SPI_InitStructure.SPI_CPHA SPI_CPHA_1Edge; //数据在时钟的上升沿被传输。SPI_InitStructure.SPI_NSS SPI_NSS_Soft;SPI_InitStructure.SPI_BaudRatePrescaler SPI_BaudRatePrescaler_4;SPI_InitStructure.SPI_FirstBit SPI_FirstBit_MSB;SPI_InitStructure.SPI_CRCPolynomial 7;SPI_Init( SPI1, SPI_InitStructure );SPI_Cmd( SPI1, ENABLE );
}//使能dma1的通道3因为spi输出对应的是此通道
void MYDMA_Enable(DMA_Channel_TypeDef*DMA_CHx)
{DMA_Cmd(DMA_CHx, DISABLE );DMA_SetCurrDataCounter(DMA1_Channel3,DMA1_MEM_LEN);DMA_Cmd(DMA_CHx, ENABLE);
}/********************************************************************** fn DMA_Tx_Init** brief Initializes the DMAy Channelx configuration.** param DMA_CHx - x can be 1 to 7.* ppadr - Peripheral base address.* memadr - Memory base address.* bufsize - DMA channel buffer size.** return none*/
void DMA_Tx_Init( DMA_Channel_TypeDef* DMA_CHx, u32 ppadr, u32 memadr, u16 bufsize)
{DMA_InitTypeDef DMA_InitStructure{0};RCC_AHBPeriphClockCmd( RCC_AHBPeriph_DMA1, ENABLE );DMA_DeInit(DMA_CHx);DMA1_MEM_LENbufsize;DMA_InitStructure.DMA_PeripheralBaseAddr ppadr;DMA_InitStructure.DMA_MemoryBaseAddr memadr;DMA_InitStructure.DMA_DIR DMA_DIR_PeripheralDST;DMA_InitStructure.DMA_BufferSize bufsize;DMA_InitStructure.DMA_PeripheralInc DMA_PeripheralInc_Disable;DMA_InitStructure.DMA_MemoryInc DMA_MemoryInc_Enable;DMA_InitStructure.DMA_PeripheralDataSize DMA_PeripheralDataSize_Byte;DMA_InitStructure.DMA_MemoryDataSize DMA_MemoryDataSize_Byte;DMA_InitStructure.DMA_Mode DMA_Mode_Normal;DMA_InitStructure.DMA_Priority DMA_Priority_Medium;DMA_InitStructure.DMA_M2M DMA_M2M_Disable;DMA_Init( DMA_CHx, DMA_InitStructure );
}/********************************************************************** fn main** brief Main program.** return none*/
int main(void)
{u8 i 0;NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);SystemCoreClockUpdate();Delay_Init();USART_Printf_Init(115200); printf(SystemClk:%d\r\n, SystemCoreClock);printf( ChipID:%08x\r\n, DBGMCU_GetCHIPID() );printf(GPIO Toggle TEST\r\n);GPIO_Toggle_INIT();LCD_GPIO_Init();
#ifdef SPI_hardwareprintf(SPI_HARDWARE);SPI_1Lines_HalfDuplex_Init();
#ifdef SPI_hardware_dmaprintf(SPI_HARDWARE_DMA);DMA_Tx_Init( DMA1_Channel3, (u32)SPI1-DATAR, (u32)TxData, Buf_Size );DMA_Cmd( DMA1_Channel3, ENABLE );
#endif
#elseprintf(SPI_SOFTWARE);
#endifLCD_Init();GPIO_WriteBit(GPIOB, GPIO_Pin_13,Bit_RESET);while(1){Delay_Ms(1000);FillRect_DMA(GREEN);Gui_DrawFont_GBK16_DMA(0,5,BLACK,GREEN,HELLO world);Gui_DrawFont_GBK16_DMA(0,25,RED,GREEN,LCD OK DISPLAY);Gui_DrawFont_GBK16_DMA(0,45,RED,GREEN,智能物联红外测温系统通过人数);Gui_DrawFont_GBK16_DMA(0,65,RED,GREEN,报警人数人体温度环境表面距离);Gui_DrawFont_GBK16_DMA(0,85,RED,GREEN,网络连接中.温度气象站雨量风速);Gui_DrawFont_GBK16_DMA(0,105,RED,GREEN,创新实验平台℃);Delay_Ms(2000);FillRect_DMA(RED);Delay_Ms(1000);FillRect_DMA(BLUE);Gui_DrawFont_GBK16_DMA(0,5,WHITE,BLUE,HELLO world);Gui_DrawFont_GBK16_DMA(0,25,WHITE,BLUE,LCD OK DISPLAY);Gui_DrawFont_GBK16_DMA(0,45,WHITE,BLUE,智能物联红外测温系统通过人数);Gui_DrawFont_GBK16_DMA(0,65,WHITE,BLUE,报警人数人体温度环境表面距离);Gui_DrawFont_GBK16_DMA(0,85,WHITE,BLUE,网络连接中.温度气象站雨量风速);Gui_DrawFont_GBK16_DMA(0,105,WHITE,BLUE,创新实验平台℃);Delay_Ms(1000);FillRect_DMA(YELLOW);Delay_Ms(1000);FillRect(0, 0, 239, 63, RED );Gui_DrawFont_GBK16(15,5,BLACK,GRAY0,HELLO world);Gui_DrawFont_GBK16(15,25,RED,GRAY0,LCD OK DISPLAY);Gui_DrawFont_GBK16(15,45,RED,GRAY0,智能物联红外测温系统通过人数);Gui_DrawFont_GBK16(15,65,RED,GRAY0,报警人数人体温度环境表面距离);Gui_DrawFont_GBK16(15,85,RED,GRAY0,网络连接中.温度气象站雨量风速);Gui_DrawFont_GBK16(15,105,RED,GRAY0,创新实验平台℃);Delay_Ms(1000);GPIO_WriteBit(GPIOB, GPIO_Pin_13, (i 0) ? (i Bit_SET) : (i Bit_RESET));printf( GPIOB:%d\r\n, i);FillRect(0, 0, 239, 319, RED );Delay_Ms(1000);FillRect(0, 0, 239, 319, GREEN );Delay_Ms(1000);FillRect(0, 0, 239, 319, BLUE );FillRect(50, 50, 100, 100, RED );}
}二、说明 1、增加了 Gui_DrawPoint_DMA(unsigned int x,unsigned int y,unsigned int Data)向DMA内存画点的功能 void Gui_DrawPoint_DMA(unsigned int x,unsigned int y,unsigned int Data) { TxData[2*xy*480]Data8; TxData[2*xy*4801]Data; } 2、增加了void DMA_BUFFER_RESET(unsigned int bc)用于清空DMA内存 void DMA_BUFFER_RESET(unsigned int bc) { unsigned int j; for(j0 ;jBuf_Size;){ TxData[j] bc8; TxData[j1] bc; j 2; } } 3、增加了Gui_DrawFont_GBK16_DMA(unsigned int x, unsigned int y, unsigned int fc, unsigned int bc,unsigned char *s)。用于处理字符串并以DMA方式输出到屏幕。 void Gui_DrawFont_GBK16_DMA(unsigned int x, unsigned int y, unsigned int fc, unsigned int bc,unsigned char *s) { unsigned char i,j; unsigned short k,x0,y0; x0x; y0y; x0; y0; DMA_BUFFER_RESET(bc); //清缓存 while(*s) { if((*s) 128) { k*s; if (k13) { xx0; y16; } else { if (k32) k-32; else k0; for(i0;i16;i) for(j0;j8;j) { if(asc16[k*16i](0x80j)) Gui_DrawPoint_DMA(xj,yi,fc); else { if (fc!bc) Gui_DrawPoint_DMA(xj,yi,bc); } } x8; } s; } else { for (k0;khz16_num;k) { if ((hz16[k].Index[0]*(s))(hz16[k].Index[1]*(s1))) { for(i0;i16;i) { for(j0;j8;j) { if(hz16[k].Msk[i*2](0x80j)) Gui_DrawPoint_DMA(xj,yi,fc); else { if (fc!bc) Gui_DrawPoint_DMA(xj,yi,bc); } } for(j0;j8;j) { if(hz16[k].Msk[i*21](0x80j)) Gui_DrawPoint_DMA(xj8,yi,fc); else { if (fc!bc) Gui_DrawPoint_DMA(xj8,yi,bc); } } } } } s2;x16; } } LCD_SetWindow(0,y0,239,y016); LCD_CS_CLR; SPI_WriteData(0x72); SPI_I2S_DMACmd(SPI1,SPI_I2S_DMAReq_Tx,ENABLE); MYDMA_Enable(DMA1_Channel3); while(1){ if(DMA_GetFlagStatus(DMA1_FLAG_TC3)!RESET) { DMA_ClearFlag(DMA1_FLAG_TC3); break; } } LCD_CS_SET; } 三、总结
1、申请的DMA空间为480*16对应于屏幕是一个240*16的长条空间。也就是每次向屏幕刷一个 240*16范围对应文字就是一行。改变起始位置就可以在其他地方再刷一行。 DMA快速显示文字
