1 files changed, 72 insertions, 0 deletions
diff --git a/src/libs/usb/cusb.h b/src/libs/usb/cusb.h
new file mode 100644
index 0000000..b751dd5
--- /dev/null
+++ b/src/libs/usb/cusb.h
@@ -0,0 +1,72 @@
+#ifndef __USB_H__
+#define __USB_H__
+
+#include "../types.h"
+#include "../utils.h"
+#include "proto.h"
+
+#define USBCTRL_DPSRAM_SIZE (1024*4) // See p122
+#define USBCTRL_BUFFER_SIZE 64 // See p385
+#define USB_ENDPOINT_COUNT 3   // Number of endpoints for the device driver
+#define USB_INTERFACE_COUNT 2 // Number of interfaces for the device driver
+#define BCD_USB 0x0110
+#define USB_BUFFER_OFFSET(ADDR) (ADDR ^ USBCTRL_DPSRAM_BASE) // See here https://github.com/raspberrypi/pico-examples/blob/master/usb/device/dev_lowlevel/dev_lowlevel.c#L141
+
+typedef struct EndPoint {
+  void *buffer0;
+  void *buffer1;
+  void *rbc; // EP control register
+  volatile u32 *rbc_in; // EP buffer control in register
+  volatile u32 *rbc_out; // EP buffer control out register
+  int next_pid;
+  int is_in;
+} EndPoint;
+
+typedef  struct EndPointConfiguration{
+  USB_ENDPOINT_DESCRIPTOR endpoint_descriptor;
+  volatile u32* buffer0;
+  volatile u32* buffer1;
+  volatile u32* buffer_control;
+  volatile u32* endpoint_control;
+  u32 next_pid; // Next usb pkt pid (DATA0/DATA1)
+  void (*handler)(u8*,int);
+} EndPointConfiguration;
+
+typedef struct FunctionalDescriptors {
+  int size;
+  void* descriptors;
+} FunctionalDescriptors;
+
+typedef struct DeviceConfiguration {
+  u8 devaddr; // Current device address
+  u8 setdevaddr; // Set to one when devaddr is available
+  u8 configured; // Set to true when host triggered SET_CONFIGURATION
+  USB_DEVICE_DESCRIPTOR device_descriptor;
+  USB_CONFIGURATION_DESCRIPTOR configuration_descriptor;
+  USB_INTERFACE_DESCRIPTOR interface_descriptors[USB_INTERFACE_COUNT];
+  EndPointConfiguration endpoints[2+USB_ENDPOINT_COUNT]; // Endpoint 0 in and out always required so +2
+  USB_STRING_DESCRIPTOR_ZERO supported_languages;
+  FunctionalDescriptors functional_descriptors;
+  void *full_configuration_descriptor;
+  void (*setup_handler)(UD_SETUP *pkt); // Notify the driver in case of unhandled setup packet
+  void (*setup_ack_handler)(void); // Notify the driver
+  void (*eoi)(void); // Notify the driver for End Of Interrupt
+  char *descriptor_strings[]; // All string like vendor and product id
+} DeviceConfiguration;
+
+
+void cusb_init(DeviceConfiguration *dc);
+void cusb_init_device_configuration();
+void cusb_ep0_in_handler(u8 *buffer, int len);
+void cusb_ep0_out_handler(u8 *buffer, int len);
+void cusb_handle_setup(void);
+void cusb_handle_bus_reset(void);
+void cusb_handle_buffer_status(void);
+int cusb_check_interrupt(int int_bit);
+void usb_start_xfer(void* data, u32 size, int ep);
+void cusb_start_xfer(void *data, u32 size, EndPointConfiguration *ep);
+void cusb_status_xfer(u32 dir);
+void cusb_eoi(); // Trigger at end of each USB interrupt
+void cusb_isr_trigger(); // Manually trigger an usb interrupt
+
+#endif