enable CFG_TUH_CDC for rp2040 core

Author: hathach

src/arduino/ports/rp2040/tusb_config_rp2040.h

@@ -97,16 +97,33 @@ extern int serial1_printf(const char *__restrict __format, ...);
 // Size of buffer to hold descriptors and other data used for enumeration
 #define CFG_TUH_ENUMERATION_BUFSIZE 256
 
+// Number of hub devices
 #define CFG_TUH_HUB 1
+
 // max device support (excluding hub device)
 #define CFG_TUH_DEVICE_MAX (CFG_TUH_HUB ? 4 : 1) // hub typically has 4 ports
 
 // Enable tuh_edpt_xfer() API
 //#define CFG_TUH_API_EDPT_XFER       1
 
+// Number of mass storage
 #define CFG_TUH_MSC 1
+
+// Number of HIDs
 #define CFG_TUH_HID 4
 
+// Number of CDC interfaces
+#define CFG_TUH_CDC 1
+
+// Set Line Control state on enumeration/mounted:
+// DTR ( bit 0), RTS (bit 1)
+#define CFG_TUH_CDC_LINE_CONTROL_ON_ENUM    0x03
+
+// Set Line Coding on enumeration/mounted, value for cdc_line_coding_t
+// bit rate = 115200, 1 stop bit, no parity, 8 bit data width
+// This need https://github.com/sekigon-gonnoc/Pico-PIO-USB/pull/58 to be merged first
+// #define CFG_TUH_CDC_LINE_CODING_ON_ENUM   { 115200, CDC_LINE_CONDING_STOP_BITS_1, CDC_LINE_CODING_PARITY_NONE, 8 }
+
 #ifdef __cplusplus
 }
 #endif