usb: enable debug log over uart

Makefile

@@ -7,8 +7,8 @@ TARGET = badgemagic-ch582
 ######################################
 # building variables
 ######################################
-# debug build?
-DEBUG = 1
+# Uncomment below line to enable debugging
+# DEBUG = 1
 # optimization for size
 OPT = -Os
 
@@ -58,7 +58,7 @@ src/ble/profile/devinfo.c \
 src/ble/setup.c \
 src/ble/peripheral.c \
 src/data.c \
-
+src/usb/debug.c \
 
 # ASM sources
 ASM_SOURCES =  \
@@ -108,7 +108,7 @@ ASFLAGS = $(MCU) $(AS_INCLUDES) $(OPT) -Wall -fdata-sections -ffunction-sections
 CFLAGS = $(MCU) $(C_INCLUDES) $(OPT) -Wall -fdata-sections -ffunction-sections
 
 ifeq ($(DEBUG), 1)
-CFLAGS += -g -gdwarf-2
+CFLAGS += -g -gdwarf-2 -DDEBUG=$(DEBUG)
 endif
 
 

src/main.c

@@ -123,10 +123,22 @@ void handle_mode_transition()
 	prev_mode = mode;
 }
 
+static void debug_init()
+{
+	GPIOA_SetBits(GPIO_Pin_9);
+	GPIOA_ModeCfg(GPIO_Pin_8, GPIO_ModeIN_PU);
+	GPIOA_ModeCfg(GPIO_Pin_9, GPIO_ModeOut_PP_5mA);
+	UART1_DefInit();
+	UART1_BaudRateCfg(921600);
+}
+
 int main()
 {
 	SetSysClock(CLK_SOURCE_PLL_60MHz);
 
+	debug_init();
+	PRINT("\nDebug console is on UART%d\n", DEBUG);
+
 	led_init();
 	TMR0_TimerInit(SCAN_T / 2);
 	TMR0_ITCfg(ENABLE, TMR0_3_IT_CYC_END);

src/usb/debug.c

@@ -0,0 +1,82 @@
+#include "CH58x_common.h"
+
+void print_setuppk(USB_SETUP_REQ *request)
+{
+	PRINT("Setup request:\n");
+
+	char *dir[] = {"OUT", "IN"};
+	char *type[] = {"Standard", "Class", "Vendor", "Reserved Type"};
+	char *recipient[] = {
+		"Device", "Interface", "Endpoint", "Other","Reserved Recipient"
+	};
+	char *bRequest[] = {
+		"GET_STATUS",
+		"CLEAR_FEATURE",
+		"Reserved",
+		"SET_FEATURE",
+		"Reserved",
+		"SET_ADDRESS",
+		"GET_DESCRIPTOR",
+		"SET_DESCRIPTOR",
+		"GET_CONFIGURATION",
+		"SET_CONFIGURATION",
+		"GET_INTERFACE",
+		"SET_INTERFACE",
+		"SYNCH_FRAME",
+	};
+
+	uint8_t t = request->bRequestType;
+	uint8_t req = request->bRequest;
+	uint8_t type_val = (t & USB_REQ_TYP_MASK) >> 5;
+	uint8_t recip_val = t & USB_REQ_RECIP_MASK;
+	if (recip_val > 4)
+		recip_val = 4;
+
+	PRINT("\t- bRequestType: 0x%02x (%s|%s|%s)\n", t, dir[t>>7], 
+				type[type_val],
+				recipient[recip_val]);
+
+	PRINT("\t- bRequest: 0x%02x (%s)\n", req, req > 12 ?
+				"N/A" : bRequest[req]);
+	PRINT("\t- wValue: 0x%04x\n", request->wValue);
+
+	PRINT("\t- wIndex%s: 0x%04x\n", 
+				recip_val == USB_REQ_RECIP_INTERF ? " (wInterfaceNumber)" : "",
+				request->wIndex);
+
+	PRINT("\t- wLength: 0x%04x\n", request->wLength);
+}
+
+void print_status_reg()
+{
+	char *token_type[] = {
+		"OUT", "SOF","IN", "SETUP",
+	};
+	uint8_t reg = R8_USB_INT_ST;
+	uint8_t is_setup = reg & RB_UIS_SETUP_ACT;
+	uint8_t toggle = reg & RB_UIS_TOG_OK;
+	uint8_t token = (reg & MASK_UIS_TOKEN) >> 4;
+	uint8_t ep_num = reg & MASK_UIS_ENDP;
+	PRINT("usb: Status reg: 0x%02x (%s|%s|%s|EP:%d)\n", reg, 
+				is_setup ? "SETUP??" : "0",
+				toggle ? "TOGGLE OK" : "0", token_type[token], ep_num);
+}
+
+void print_intflag_reg()
+{
+	uint8_t reg = R8_USB_INT_FG;
+	uint8_t is_nak = reg & RB_U_IS_NAK;
+	uint8_t tog_ok = reg & RB_U_TOG_OK;
+	uint8_t sie = reg & RB_U_SIE_FREE;
+	uint8_t overflow = reg & RB_UIF_FIFO_OV;
+	uint8_t suspend = reg & RB_UIF_SUSPEND;
+	uint8_t xfer_complete = reg & RB_UIF_TRANSFER;
+	uint8_t bus_reset = reg & RB_UIF_BUS_RST;
+	PRINT("usb: Interrupt reg: 0x%02x (%s|%s|%s|%s|%s|%s)\n", reg, 
+				is_nak ? "NAK received" : "0",
+				tog_ok ? "Toggle ok" : "0",
+				sie ? "SIE" : "0",
+				overflow ? "FIFO overflow" : "0",
+				suspend ? "Suspend" : "0",
+				xfer_complete ? "Xfer completed" : "0");
+}

src/usb/debug.h

@@ -0,0 +1,14 @@
+#ifndef __DEBUG_H__
+#define __DEBUG_H__
+
+#include "CH58x_common.h"
+
+
+#define _TRACE() PRINT("> "); PRINT(__FILE__);PRINT(": "); PRINT(__func__); \
+				PRINT("()\n")
+
+void print_setuppk(USB_SETUP_REQ *setup_req_pk);
+void print_status_reg();
+void print_intflag_reg();
+
+#endif /* __DEBUG_H__ */