SPI-DMA, 驱动全彩LED，猜猜驱动的谁
SPI-DMA@STC32F12K54驱动全彩LED，无需反相，灯带数量只受xdata大小限制
===STC32F12K54, 8K edata
===STC32F12K54, 4K xdata, xdata 可以做 DMA-SPI 的缓冲区
时钟：默认的52Mhz，基于库函数的初始化
初始化部分：spi
- void SPI_config(void)
- {
- SPI_InitTypeDef SPI_InitStructure;
-
- SPI_InitStructure.SPI_Enable = ENABLE; //SPI启动 ENABLE, DISABLE
- SPI_InitStructure.SPI_SSIG = DISABLE; //片选位 ENABLE, DISABLE
- SPI_InitStructure.SPI_FirstBit = SPI_MSB; //移位方向 SPI_MSB, SPI_LSB
- SPI_InitStructure.SPI_Mode = SPI_Mode_Master; //主从选择 SPI_Mode_Master, SPI_Mode_Slave
- SPI_InitStructure.SPI_CPOL = SPI_CPOL_High; //时钟相位 SPI_CPOL_High, SPI_CPOL_Low
- SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge; //数据边沿 SPI_CPHA_1Edge, SPI_CPHA_2Edge
- SPI_InitStructure.SPI_Speed = SPI_Speed_2; //SPI速度 SPI_Speed_4, SPI_Speed_8, SPI_Speed_16, SPI_Speed_2
- SPI_Init(&SPI_InitStructure);
- NVIC_SPI_Init(DISABLE,Priority_0); //中断使能, ENABLE/DISABLE; 优先级(低到高) Priority_0,Priority_1,Priority_2,Priority_3
- // HSPllClkConfig(MCLKSEL_HIRC,PLL_96M,4); //系统时钟选择,PLL时钟选择,时钟分频系数
- HSSPI_Enable();
- }
初始化部分：DMA
- void DMA_config(void)
- {
- DMA_SPI_InitTypeDef DMA_SPI_InitStructure; //结构定义
-
- //----------------------------------------------
- DMA_SPI_InitStructure.DMA_Enable = DISABLE; //DMA使能 ENABLE,DISABLE
- DMA_SPI_InitStructure.DMA_Tx_Enable = ENABLE; //DMA发送数据使能 ENABLE,DISABLE
- DMA_SPI_InitStructure.DMA_Rx_Enable = ENABLE; //DMA接收数据使能 ENABLE,DISABLE
- DMA_SPI_InitStructure.DMA_Length = BUF_LENGTH; //DMA传输总字节数 (0~65535) + 1
- DMA_SPI_InitStructure.DMA_Tx_Buffer = (u16)SpiTxBuffer; //发送数据存储地址
- DMA_SPI_InitStructure.DMA_Rx_Buffer = (u16)SpiRxBuffer; //接收数据存储地址
- DMA_SPI_InitStructure.DMA_SS_Sel = SPI_SS_P35; //自动控制SS脚选择 SPI_SS_P12,SPI_SS_P22,SPI_SS_P74,SPI_SS_P35
- DMA_SPI_InitStructure.DMA_AUTO_SS = DISABLE; //自动控制SS脚使能 ENABLE,DISABLE
- DMA_SPI_Inilize(&DMA_SPI_InitStructure); //初始化
- SET_DMA_SPI_CR(DMA_ENABLE | CLR_FIFO); //bit7 1:使能 SPI_DMA, bit5 1:开始 SPI_DMA 从机模式, bit0 1:清除 SPI_DMA FIFO
- NVIC_DMA_SPI_Init(ENABLE,Priority_3,Priority_3); //中断使能, ENABLE/DISABLE; 优先级(低到高) Priority_0~Priority_3; 总线优先级(低到高) Priority_0~Priority_3
-
- }
初始化部分：灯带
- void init_led()
- {
- u16 i;
- P2_SPEED_HIGH(GPIO_Pin_3);
- P24=0;//MISO置0
- P23=1;//MOSI
- //SpiTxBuffer[i]=0xf0;//f0 0
- delay_ms(1);
- P23=0;
- SPI_config();
- DMA_config();
- SpiTxFlag=1;
- delay_ms(1);
- for(i=0;i<LED_COUNT;i++)
- set_led(i,0x00,0x00,0x00);//这里必须先发送一次spi，要保证最后一字节的最后一bit为0，这里为了方便就直接调用了灯带函数
- updata_led();
- delay_ms(10);
-
- }
设置led缓存，更新led- <blockquote>#define<span style="white-space:pre"> </span>LED_COUNT<span style="white-space:pre"> </span> 30 //灯珠数量
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发表于 2023-12-10 19:17:45
发表于 2023-12-10 19:42:33
