Add support for USB Host / CDC Devices based on FTDI chipsets (FT232)

.gitignore

@@ -0,0 +1,4 @@
+*.a
+*.o
+.DS_Store
+build/

_sdk/src/sdk_uart.c

@@ -438,6 +438,7 @@ void UartStdioHandler(void)
 	while (UART_RecvReady(UART_STDIO_PORT)) // received data ready
 	{
 		ch = UART_RecvChar(UART_STDIO_PORT); // receive character from UART
+		UartPrint("%c", ch); // echo character
 		if (RingWriteReady(&UartStdioRxBuf, 1)) // if space in receive buffer
 			RingWrite8(&UartStdioRxBuf, ch); // write character
 		// otherwise lost received data if receive buffer is full

_sdk/usb_inc/sdk_usb_host_cdc.h

@@ -112,9 +112,11 @@ void UsbHostCdcTerm();
 // open class interface (returns size of used interface, 0=not supported)
 // - At this point, no communications are allowed yet.
 u16 UsbHostCdcOpen(u8 dev_addr, const sUsbDescItf* itf, u16 max_len);
+u16 UsbHostCdcOpenFTDI(u8 dev_addr, const sUsbDescItf* itf, u16 max_len);
 
 // set config interface
 Bool UsbHostCdcCfg(u8 dev_addr, u8 itf_num);
+Bool UsbHostCdcCfgFTDI(u8 dev_addr, u8 itf_num);
 
 // transfer complete callback
 Bool UsbHostCdcComp(u8 dev_addr, u8 dev_epinx, u8 xres, u16 len);

_sdk/usb_src/sdk_usb_host.c

@@ -24,6 +24,7 @@
 
 #include "../inc/sdk_irq.h"
 #include "../inc/sdk_timer.h"
+#include "../inc/sdk_uart.h"
 #include "../usb_inc/sdk_usb_host.h"
 #include "../usb_inc/sdk_usb_host_cdc.h"	// USB Communication Device Class (host)
 #include "../usb_inc/sdk_usb_host_hid.h"	// USB Human Interface Device Class (host)
@@ -59,8 +60,8 @@ const sUsbHostDrv UsbHostDrv[] = {
 	{
 		UsbHostCdcInit,		// initialize class driver
 		UsbHostCdcTerm,		// terminate class driver
-		UsbHostCdcOpen,		// open device class interface
-		UsbHostCdcCfg,		// configure interface
+		UsbHostCdcOpenFTDI, 	// open device class interface
+		UsbHostCdcCfgFTDI,	// configure interface
 		UsbHostCdcComp,		// transfer complete callback
 		UsbHostCdcClose,	// close device
 		UsbHostCdcSof,		// sending SOF (start of frame; NULL=not used)
@@ -401,6 +402,8 @@ Bool UsbHostParseCfg(u8 dev_addr, const u8* p_desc)
 		// some CDC devices does not use interface association, need to set 2 interfaces manually
 		if ((assoc == 1) && (desc_itf->itf_class == USB_CLASS_CDC) && (desc_itf->itf_subclass == 2)) assoc = 2;
 
+		assoc = 2; // FIXME: force this for now for CDC/FTDI
+
 		// search support of this interface in class device drivers
 		u16 rem_len = desc_end - p_desc; // remaining length
 		u8 drv_id;
@@ -506,6 +509,8 @@ Bool UsbHostGetDesc(u8 dev_addr, u8 desc_type, u8 inx, u16 lang, void* buf, u16
 // is marked as mounted.
 void UsbHostCfgComp(u8 dev_addr, u8 itf_num)
 {
+	UartPrint("UsbHostCfgComp(%u,%u)\n", dev_addr, itf_num);
+
 	// continue to next interface
 	itf_num++;
 
@@ -556,6 +561,8 @@ void UsbHostCfgComp(u8 dev_addr, u8 itf_num)
 //  xres ... transfer result USB_XRES_*
 void UsbHostEnum(u8 dev_addr, u8 xres)
 {
+	UartPrint("UsbHostEnum(%u)\n", UsbHostEnumState);
+
 	// idle
 	if (UsbHostEnumState == USB_HOST_ENUM_IDLE) return;
 

_sdk/usb_src/sdk_usb_host_cdc.c

@@ -23,6 +23,7 @@
 #if USE_USB_HOST_CDC	// use USB CDC Communication Device Class, value = number of interfaces (host)
 
 #include "../inc/sdk_timer.h"
+#include "../inc/sdk_uart.h"
 #include "../usb_inc/sdk_usb_host.h"
 #include "../usb_inc/sdk_usb_host_cdc.h"
 
@@ -211,6 +212,8 @@ void UsbHostCdcAllRecv()
 // initialize class driver
 void UsbHostCdcInit()
 {
+	UartPrint("UsbHostCdcInit\n");
+
 	memset(UsbHostCdcInter, 0, sizeof(UsbHostCdcInter));
 
 	u8 cdc_inx;
@@ -231,6 +234,34 @@ void UsbHostCdcTerm()
 
 }
 
+// FTDI device open
+u16 UsbHostCdcOpenFTDI(u8 dev_addr, const sUsbDescItf* itf, u16 max_len)
+{
+	UartPrint("UsbHostCdcOpenFTDI\n"); // FTDI includes 1 vendor interface and 2 bulk endpoints
+
+	// check descriptor size
+	if (USB_DESC_LEN(itf) > max_len) return 0;
+
+	// allocate new interface
+	u8 cdc_inx = UsbHostCdcNewItf(dev_addr, itf);
+	if (cdc_inx == USB_DRVID_INVALID) return 0;
+
+	// pointer to CDC interface
+	sUsbHostCdcInter* cdc = &UsbHostCdcInter[cdc_inx];
+
+	// skip interface descriptor
+	u16 drv_len = USB_DESC_LEN(itf);
+	const u8* p_desc = USB_DESC_NEXT(itf);
+
+	// open endpoint pair
+	if (!UsbHostOpenEpPair(dev_addr, p_desc, 2, &cdc->ep_out, &cdc->ep_in, NULL, NULL)) return 0;
+
+	// skip endpoint descriptors
+	drv_len += 2*sizeof(sUsbDescEp);
+
+	return drv_len;
+}
+
 // open class interface (returns size of used interface, 0=not supported)
 // - At this point, no communications are allowed yet.
 u16 UsbHostCdcOpen(u8 dev_addr, const sUsbDescItf* itf, u16 max_len)
@@ -321,6 +352,69 @@ void UsbHostCdcCfgComp(u8 dev_addr, u8 xres)
 	UsbHostCfgComp(dev_addr, itf_num+1);
 }
 
+void UsbHostCdcCfgFTDILine(u8 dev_addr, u8 xres)
+{
+	UartPrint("UsbHostCdcCfgFTDILine\n");
+
+	// pointer to setup packet
+	sUsbSetupPkt* setup = &UsbSetupRequest;
+
+	// FTDI line setting
+	setup->type    = 0x40  ; // out | vendor | device
+	setup->request = 0x01  ; // line state
+	setup->value   = 0x0303; // enable DTR/RTS
+	setup->index   = 0x0000; // no index
+	setup->length  = 0x0000; // no data
+
+	// send data
+	UsbHostCtrlXfer(dev_addr, NULL, UsbHostCdcCfgComp);
+}
+
+void UsbHostCdcCfgFTDIBaud(u8 dev_addr, u8 xres)
+{
+	UartPrint("UsbHostCdcCfgFTDIBaud\n");
+
+	// pointer to setup packet
+	sUsbSetupPkt* setup = &UsbSetupRequest;
+
+	// FTDI baud rate
+	setup->type    = 0x40  ; // out | vendor | device
+	setup->request = 0x03  ; // set baud rate
+	setup->value   = 0x4138; // 9600 baud (3MHz/312.5)
+	setup->index   = 0x0000; // no index
+	setup->length  = 0x0000; // no data
+
+	// send data
+	UsbHostCtrlXfer(dev_addr, NULL, UsbHostCdcCfgFTDILine);
+}
+
+Bool UsbHostCdcCfgFTDI (u8 dev_addr, u8 itf_num)
+{
+	UartPrint("UsbHostCdcCfgFTDI\n");
+
+	// find interface by interface number (returns interface index, or USB_DRVID_INVALID if not found)
+	u8 cdc_inx = UsbHostCdcFindItf(dev_addr, itf_num);
+	if (cdc_inx == USB_DRVID_INVALID) return False;
+
+	// pointer to CDC interface
+	sUsbHostCdcInter* cdc = &UsbHostCdcInter[cdc_inx];
+
+	// pointer to setup packet
+	sUsbSetupPkt* setup = &UsbSetupRequest;
+
+	// FTDI controller reset
+	setup->type    = 0x40  ; // out | vendor | device
+	setup->request = 0x00  ; // reset
+	setup->value   = 0x0000; // purges RX/TX, clears DTR/RTS, data as 8N1, leave baud
+	setup->index   = 0x0000; // no index
+	setup->length  = 0x0000; // no data
+
+	// send data
+	UsbHostCdcCfg_Itf = itf_num; // temporary save interface
+	UsbHostCtrlXfer(dev_addr, NULL, UsbHostCdcCfgFTDIBaud);
+	return True;
+}
+
 // set config interface
 Bool UsbHostCdcCfg(u8 dev_addr, u8 itf_num)
 {

_setup.sh

@@ -63,10 +63,10 @@ case "$1" in
 	export DEVCLASS="pico"
 	export DEVDIR="!Pico"
 	;;
-     *) 
-	export DEVICE="picopad10"
-	export DEVCLASS="picopad"
-	export DEVDIR="!PicoPad10"
+     *)
+	export DEVICE="pico"
+	export DEVCLASS="pico"
+	export DEVDIR="!Pico"
 	;;
 esac