MCC USB CDC设备无法获得CTS，DSR，RI，DCD工作

首先是背景。我正在做一个USB到串行转换器，相当于一个老学校RS232模拟调制解调器。（后端是唯一的，但是前端使用RS232端口（TX、RX、RTS、DTR、CTS、DSR、RI和DCD）中正常的8个IO线路。我使用安装有MCC 3.36的APIC32 MM0256GPM048和MPLABX 4.05。什么工作：TX、RX、RTS、DTRT什么NoCTS、DSR、RI、DCD（所有由CDCntiFICICHACTHER处理的）I DId找到下面的缺陷并启用它们：γ定义UbjdCDCpSpRePosidSrRebug，定义UARTHARDTS PORTCITS。RC3*定义了Ubj*CdcDrScAc能能能级0和MimItdTcNoScript（）函数调用，将PIN设置为输入。ODE在我的末尾有一点胶粘代码，把TX消息打包回RX缓冲区和连接器、DTR、CTS、DSR、RI和DCD到物理引脚。缓冲包装+ RTS和DTR引脚按预期切换。开始调试时，我使用标准USB到串行狗耳，并验证测试程序正在正确读取输入状态。（我能够切换所有4个输入，并得到状态显示，如预期在测试程序）下，我启动了微软消息分析器（我们正在运行在Windows 10），并看了看巴士，因为我切换输入通过PIC。当我切换输入时，我看到“清除端点0x81EndoPositHalt”和“在EntdBaseStutsSuffErr.OrrRun”中的“在每个引脚切换中的对”。在3天的时间里，我一直在抨击这个bug，只是在PIC结束时需要改变我的想法来获得这些信息。状态正确传输。猜测我只是错过了一些简单的，但到目前为止没有运气。



      以下为原文

    Bit of background first. I am working on making a USB to serial converter for what amounts to a old school RS232 analog modem. (Back end is unique but the front end uses the normal 8 IO lines in a RS232 port (TX, RX, RTS, DTR, CTS, DSR, RI, and DCD)

I am using a PIC32MM0256GPM048 and MPLABX 4.05 with MCC 3.36 installed.

What works:
TX, RX, RTS, DTR

What does not
CTS, DSR, RI, DCD (everything handled by CDCNotificationHandler )

I did find the following defs and enabled them:
#define USB_CDC_SUPPORT_DSR_REPORTING
#define UART_DTS PORTCbits.RC3
#define USB_CDC_DSR_ACTIVE_LEVEL 0
along with the mInitDTSPin() function call to set up the pin as a input.
Also the USB CDC device is running in interrupt mode.

Other than the USB CDC device code I have a bit of glue code on my end to wrap the TX messages back to the RX buffer and connect RTS, DTR, CTS, DSR, RI, and DCD to physical pins. The buffer wrap + the RTS and DTR pins toggle as expected.

To start out the debug I took a standard USB to serial dongle and verified the test program was reading the input states correctly. (I was able to toggle all 4 inputs and get the state to show up as expected in the test program) Next I fired up Microsoft message Analyzer (we are running on windows 10) and took a look at the bus as I toggled the inputs via the PIC. When I toggle the inputs I see "clear endpoint 0x81 feature endpoint_halt" and "Interrupt in transfer - USBD_STATUS_BUFFER_OVERRRUN" pairs at every pin toggle.

Been bashing my brain against this bug for 3 days now and just running out of ideas on what I need to change on the PIC end to get the SerialState to transfer correctly. Guessing I am just missing something simple but so far no luck.