需要缓冲区满DMA到USB EP IN吗？

嗨，玛格伦，
也许我可以尝试帮助您更详细的代码片段信息初始化DMA和端点。UART初始化也很有意思。
当做，
隆皮



     以下为原文
  Hi mgaron,
    may be I can try to help you with more detailed code snippet informations about initializing the dma and the endpoints. The uart initialization would be also interesting.
    regards,
    lumpi

你好，Lumpi，谢谢你的帮助。
请看下面的代码：总之，1大块的EP，EP 1大块。（真体环回自动演示用UART物理环回）
自动DMA设置EP1和UART TX这一作品精细之间。
自动DMA是在UART RX和EP1之间设置的。除非DMA缓冲器已满，否则不进行传输。
[为了清晰起见删除了返回代码的测试]
cyu3pmemset（（uint8_t *）&；luartcfg，0，sizeof（luartcfg））；luartcfg.baudrate = cy_u3p_uart_baudrate_115200；luartcfg.stopbit = cy_u3p_uart_one_stop_bit；luartcfg.parity = cy_u3p_uart_no_parity；luartcfg.txenable = cytrue；luartcfg.rxenable = cytrue；luartcfg.flowctrl = cyfalse；luartcfg.isdma = cytrue；lretstatus = cyu3puartinit()；lretstatus = cyu3puartsetconfig（&；luartcfg，（cyu3puartintrcb_t）0）；lretstatus = cyu3puarttxsetblockxfer（0xffffffffu）；lretstatus = cyu3puartrxsetblockxfer（0xffffffffu）；…lsize = 512；cyu3pmemset（（uint8_t *）&；lepcfg，0，sizeof（lepcfg））；lepcfg.enable = cytrue；lepcfg.eptype = cy_u3p_u***_ep_bulk；lepcfg.burstlen = -1；lepcfg.streams = 0；lepcfg.pcktsize = lsize；/*端点配置。* / lretstatus = cyu3psetepconfig（cy_fx_ep_producer，&；lepcfg）；lretstatus = cyu3psetepconfig（cy_fx_ep_consumer，&；lepcfg）；/*创建两个U口之间的DMA汽车频道。*基于USB速度设置DMA大小。* / ldmacfg.size = lsize；ldmacfg.count = pt_fx3_u3v_dma_buf_cnt；ldmacfg.prodsckid = cy_fx_ep_producer_socket；ldmacfg.conssckid = cy_u3p_lpp_socket_uart_cons；ldmacfg.dmamode = cy_u3p_dma_mode_byte；ldmacfg.notification = 0；ldmacfg.cb =（cyu3pdmacallback_t）0；ldmacfg.prodh领导= 0；ldmacfg.prodfooter = 0；ldmacfg.consheader = 0；ldmacfg.prodavailcount = 0；lretstatus = cyu3pdmachannelcreate（&；sdmachhandle [零]，cy_u3p_dma_type_auto，&；ldmacfg）；/*创建两个U口之间的DMA汽车频道。*基于USB速度设置DMA大小。* / ldmacfg.size = 16；/ / lsize；ldmacfg.count = pt_fx3_u3v_dma_buf_cnt；ldmacfg.prodsckid = cy_u3p_lpp_socket_uart_prod；ldmacfg.conssckid = cy_fx_ep_consumer_socket；lretstatus = cyu3pdmachannelcreate（&；sdmachhandle [1 ]，cy_u3p_dma_type_auto，&；ldmacfg）；/*冲洗端点记忆。* / cyu3pu***flushep（cy_fx_ep_producer）；cyu3pu***flushep（cy_fx_ep_consumer）；/*设置DMA通道传输大小。* / lretstatus = cyu3pdmachannelsetxfer（&；sdmachhandle [ 0 ]，0）；lretstatus = cyu3pdmachannelsetxfer（&；sdmachhandle [ 1 ]，0）；所以一切看起来很好的时候发送小数据包在终点。我看到几个字符终端是由控制中心发送。在相反的方向，我要把ldmacfg.sizebytes他们就能得到任何的端点（否则我得到错误：批量转移失败，错误代码：997）请让我知道如果你需要进一步的细节。马丁



     以下为原文
   Hi Lumpi and thanks for offering your help.
     
    Please see the code below: In short, 1 bulk EP out, 1 bulk EP in. (It's really the bulk loopback auto demo rigged to a physical loopback on UART)
    AUTO DMA is set between EP 1 out and UART tx. This one works fine.
    AUTO DMA is set between UART Rx and EP1 in. No transfer unless the DMA buffer is full.
    [testing of return code removed for clarity]
     
                  CyU3PMemSet((uint8_t *)&lUARTCfg, 0, sizeof(lUARTCfg));   
           lUARTCfg.baudRate = CY_U3P_UART_BAUDRATE_115200;   
           lUARTCfg.stopBit  = CY_U3P_UART_ONE_STOP_BIT;   
           lUARTCfg.parity   = CY_U3P_UART_NO_PARITY;   
           lUARTCfg.txEnable = CyTrue;   
           lUARTCfg.rxEnable = CyTrue;   
           lUARTCfg.flowCtrl = CyFalse;   
           lUARTCfg.isDma    = CyTrue;   
           lRetStatus = CyU3PUartInit();   
            
           lRetStatus = CyU3PUartSetConfig(&lUARTCfg, (CyU3PUartIntrCb_t)0);   
                 lRetStatus = CyU3PUartTxSetBlockXfer(0xFFFFFFFFU);    
   
                 lRetStatus = CyU3PUartRxSetBlockXfer(0xFFFFFFFFU);    
          ...    
                    lSize = 512;     
               CyU3PMemSet((uint8_t *)&lEPCfg, 0, sizeof(lEPCfg));     
               lEPCfg.enable = CyTrue;     
               lEPCfg.epType = CY_U3P_USB_EP_BULK;     
               lEPCfg.burstLen = 1;     
               lEPCfg.streams = 0;     
               lEPCfg.pcktSize = lSize;     
            
     
               /* Endpoints configuration. */     
               lRetStatus = CyU3PSetEpConfig(CY_FX_EP_PRODUCER, &lEPCfg);     
               lRetStatus = CyU3PSetEpConfig(CY_FX_EP_CONSUMER, &lEPCfg);     
                  
               /* Create a DMA Auto Channel between two sockets of the U port.     
                * DMA size is set based on the USB speed.     
                */     
               lDMACfg.size = lSize;     
               lDMACfg.count = PT_FX3_U3V_DMA_BUF_CNT;     
               lDMACfg.prodSckId = CY_FX_EP_PRODUCER_SOCKET;     
               lDMACfg.consSckId = CY_U3P_LPP_SOCKET_UART_CONS;     
               lDMACfg.dmaMode = CY_U3P_DMA_MODE_BYTE;     
               lDMACfg.notification = 0;     
               lDMACfg.cb = (CyU3PDmaCallback_t)0;     
               lDMACfg.prodHeader = 0;     
               lDMACfg.prodFooter = 0;     
               lDMACfg.consHeader = 0;     
               lDMACfg.prodAvailCount = 0;     
            
     
               lRetStatus = CyU3PDmaChannelCreate(&sDMAChHandle[0],     
                   CY_U3P_DMA_TYPE_AUTO,     
                   &lDMACfg);     
               /* Create a DMA Auto Channel between two sockets of the U port.     
                * DMA size is set based on the USB speed.     
                */     
               lDMACfg.size = 16; //lSize;     
               lDMACfg.count = PT_FX3_U3V_DMA_BUF_CNT;     
               lDMACfg.prodSckId = CY_U3P_LPP_SOCKET_UART_PROD;     
               lDMACfg.consSckId = CY_FX_EP_CONSUMER_SOCKET;     
               lRetStatus = CyU3PDmaChannelCreate(&sDMAChHandle[1],     
                   CY_U3P_DMA_TYPE_AUTO,     
                   &lDMACfg);     
               /* Flush the Endpoint memory. */     
               CyU3PU***FlushEp(CY_FX_EP_PRODUCER);     
               CyU3PU***FlushEp(CY_FX_EP_CONSUMER);     
            
     
               /* Set DMA Channel transfer size. */     
               lRetStatus = CyU3PDmaChannelSetXfer(&sDMAChHandle[0], 0);     
               lRetStatus = CyU3PDmaChannelSetXfer(&sDMAChHandle[1], 0);     
    
   
            
            
        So everything looks fine when sending small packets on the endpoint. I see as few chars on the terminal as was sent from the control center.   
            
        On the opposite direction, I need to send      lDMACfg.size bytes for them to be able to get anything on the IN endpoint (Otherwise I get error: BULK IN transfer failed with Error Code:997)   
            
        Please let me know if you require further details.   
            
        Martin   
            
     
            

你好，
我不知道，但我想我已经听说DMA接收数据要多4个字节到DMA事件发生。你可以尝试使用手动DMA缓冲区然后检查这些事件。一个USB端点的DMA缓冲区的大小应为64字节，全速，512字节1024字节的高速和超高速。在接收情况下，您使用16字节。你改变这个了吗？
另一个办法是不是由DMA模式字节字节使用UART模式。然后安装USB端点手动通道与…
cy_u3p_cpu_socket_cons = 0x3f00，/ *插座，FX3 CPU接收数据。* / cy_u3p_cpu_socket_prod / *插座，FX3 CPU产生的数据。*/
这可以工作，但第一次尝试的uartreveice函数是否返回接收的字节数后的预期。如果还没有工作，这是有可能的是在Fx3限制uartreceive不会工作，如果它reveices较小，如4或16个字节。可以或许是后一个问题，相对于uartreceive和限制。
当做
隆皮



     以下为原文
  Hi,
    I am not sure but I think I have heard about DMA receive data has to be a multiple of 4 bytes till DMA events occur. May be you try using a manual DMA buffer and then check these events. The dma buffer size of an USB endpoint should be 64 bytes for full speed, 512 bytes for high speed and 1024 bytes for super speed. You are using 16 bytes in the receive case. Have you changed this?
    An other solution would be using UART in byte by byte mode instead of DMA mode. And then setup your USB endpoints as manual channels with....
        CY_U3P_CPU_SOCKET_CONS = 0x3F00,            /* Socket through which the FX3 CPU receives data. */
    CY_U3P_CPU_SOCKET_PROD                      /* Socket through which the FX3 CPU produces data. */
 
    that can work, but first try the UartReveice function if it returns after receiving expected byte count. If that also not works, it is possible that there is a restriction in the FX3 that UartReceive won't work if it reveices lesser than e. g. 4 or 16 bytes. That can be may be post a question with respect to the UartReceive and restrictions.
    regards
    lumpi

你好，
在FX3 SDK发布笔记是一个已知问题和解决方案与你的问题descritpion章…
7。任何UART / I2C/SPI读传输DMA模式不填满整个DMA缓冲区将不会触发DMA回调或转移完成事件。应用程序需要检查传输完成基于UART、I2C、SPI事件，然后调用cyu3pdmachannelsetwrapup() API的DMA通道。
当做
隆皮



     以下为原文
  Hi,
    in the FX3 SDK release notes is a chapter with known issues and solutions with a descritpion to your issue...
     
    7. Any UART/I2C/SPI read transfers in DMA mode that do not fill up the entire DMA buffer will
not trigger a DMA callback or a transfer complete event. The application needs to check for
transfer completion based on the UART/I2C/SPI events and then invoke the
CyU3PDmaChannelSetWrapUp() API on the DMA channel.
    regards
    lumpi