坚持再坚持 发表于 2023-10-24 21:55:11

STM32F407中串口使用DMA+FIFO的发送问题


USART3串口发送使用DMA传输,
/* 内存地址到外设串口地址传输 */
DMA_InitStructure.DMA_DIR = DMA_DIR_MemoryToPeripheral;
/* 外设和内存数据格式都设置成字节 */



DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;       
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;


/*传输时缓冲区大小设置为3个字节*/
DMA_InitStructure.DMA_BufferSize =3个字节;
/*使能FIFO模式 */
DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Enable;
/* FIFO阈值为四分之一,也就是4个字节*/

DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_1QuarterFull;
/* 单次触发模式 */
DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;
/* 外设单次触发模式 */
DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;

疑问:缓冲区设置为3个字节,但是FIFO是4个字节,缓冲区的数值3减至0发生中断,但是没有达到FIFO发送的阈值啊?请问这种情况怎么怎么解释??还有就是我知道4节拍、8节拍和16节拍的突发模式,但是这个单次触发模式是什么意思(是达到FIFO的阈值直接一次性全部发送吗,比如FIFO的阈值设置为4*4,则达到阈值后一次性发送16个字节)??

eric2013 发表于 2023-10-25 00:43:57

1、FIFO不是这个意思,FIFO主要是缓冲DMA处理不及时用的。FIFO阈值设置的这个FIFO可以最大缓存大小。
2、节拍就是DMA的一次数据传输,比如8个节拍的一次突发就是指:一次突发,连续传输8次数据。

对于用户来说,这个两个不能随便设置,必须设置下面支持的方式

https://img.anfulai.cn/dz/attachment/forum/202105/17/160143xun6t119mt0kyibd.png

坚持再坚持 发表于 2023-10-25 08:20:14

eric2013 发表于 2023-10-25 00:43
1、FIFO不是这个意思,FIFO主要是缓冲DMA处理不及时用的。FIFO阈值设置的这个FIFO可以最大缓存大小。
2、 ...

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请问,这个DMA的单次突发是什么意思?

坚持再坚持 发表于 2023-10-25 08:35:26

eric2013 发表于 2023-10-25 00:43
1、FIFO不是这个意思,FIFO主要是缓冲DMA处理不及时用的。FIFO阈值设置的这个FIFO可以最大缓存大小。
2、 ...

明白了,谢谢,配置成单次传输的模式理解了。

坚持再坚持 发表于 2023-10-25 08:52:49

eric2013 发表于 2023-10-25 00:43
1、FIFO不是这个意思,FIFO主要是缓冲DMA处理不及时用的。FIFO阈值设置的这个FIFO可以最大缓存大小。
2、 ...

DMA 控制器可以产生单次传输或 4 个、 8 个和 16 个节拍的增量突发传输。请问使能了FIFO模式,可以配置成单次传输吗?还是必须配置成突发模式?谢谢

eric2013 发表于 2023-10-25 15:45:10

坚持再坚持 发表于 2023-10-25 08:52
DMA 控制器可以产生单次传输或 4 个、 8 个和 16 个节拍的增量突发传输。请问使能了FIFO模式,可以配置成 ...

单次就行。
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