136 lines
5.1 KiB
C
136 lines
5.1 KiB
C
/**
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* Copyright (c) 2020 Raspberry Pi (Trading) Ltd.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#ifndef DEV_LOWLEVEL_H_
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#define DEV_LOWLEVEL_H_
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#include "usb_common.h"
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// Struct in which we keep the endpoint configuration
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typedef void (*usb_ep_handler)(uint8_t *buf, uint16_t len);
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struct usb_endpoint_configuration {
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const struct usb_endpoint_descriptor *descriptor;
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usb_ep_handler handler;
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// Pointers to endpoint + buffer control registers
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// in the USB controller DPSRAM
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volatile uint32_t *endpoint_control;
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volatile uint32_t *buffer_control;
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volatile uint8_t *data_buffer;
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// Toggle after each packet (unless replying to a SETUP)
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uint8_t next_pid;
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};
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// Struct in which we keep the device configuration
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struct usb_device_configuration {
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const struct usb_device_descriptor *device_descriptor;
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const struct usb_interface_descriptor *interface_descriptor;
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const struct usb_configuration_descriptor *config_descriptor;
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const unsigned char *lang_descriptor;
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const unsigned char **descriptor_strings;
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// USB num endpoints is 16
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struct usb_endpoint_configuration endpoints[USB_NUM_ENDPOINTS];
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};
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#define EP0_IN_ADDR (USB_DIR_IN | 0)
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#define EP0_OUT_ADDR (USB_DIR_OUT | 0)
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#define EP1_OUT_ADDR (USB_DIR_OUT | 1)
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#define EP2_IN_ADDR (USB_DIR_IN | 2)
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// EP0 IN and OUT
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static const struct usb_endpoint_descriptor ep0_out = {
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.bLength = sizeof(struct usb_endpoint_descriptor),
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.bDescriptorType = USB_DT_ENDPOINT,
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.bEndpointAddress = EP0_OUT_ADDR, // EP number 0, OUT from host (rx to device)
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.bmAttributes = USB_TRANSFER_TYPE_CONTROL,
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.wMaxPacketSize = 64,
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.bInterval = 0
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};
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static const struct usb_endpoint_descriptor ep0_in = {
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.bLength = sizeof(struct usb_endpoint_descriptor),
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.bDescriptorType = USB_DT_ENDPOINT,
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.bEndpointAddress = EP0_IN_ADDR, // EP number 0, OUT from host (rx to device)
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.bmAttributes = USB_TRANSFER_TYPE_CONTROL,
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.wMaxPacketSize = 64,
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.bInterval = 0
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};
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// Descriptors
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static const struct usb_device_descriptor device_descriptor = {
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.bLength = sizeof(struct usb_device_descriptor),
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.bDescriptorType = USB_DT_DEVICE,
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.bcdUSB = 0x0110, // USB 1.1 device
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.bDeviceClass = 0, // Specified in interface descriptor
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.bDeviceSubClass = 0, // No subclass
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.bDeviceProtocol = 0, // No protocol
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.bMaxPacketSize0 = 64, // Max packet size for ep0
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.idVendor = 0x0000, // Your vendor id
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.idProduct = 0x0001, // Your product ID
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.bcdDevice = 0, // No device revision number
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.iManufacturer = 1, // Manufacturer string index
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.iProduct = 2, // Product string index
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.iSerialNumber = 0, // No serial number
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.bNumConfigurations = 1 // One configuration
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};
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static const struct usb_interface_descriptor interface_descriptor = {
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.bLength = sizeof(struct usb_interface_descriptor),
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.bDescriptorType = USB_DT_INTERFACE,
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.bInterfaceNumber = 0,
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.bAlternateSetting = 0,
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.bNumEndpoints = 2, // Interface has 2 endpoints
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.bInterfaceClass = 0xff, // Vendor specific endpoint
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.bInterfaceSubClass = 0,
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.bInterfaceProtocol = 0,
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.iInterface = 0
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};
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static const struct usb_endpoint_descriptor ep1_out = {
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.bLength = sizeof(struct usb_endpoint_descriptor),
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.bDescriptorType = USB_DT_ENDPOINT,
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.bEndpointAddress = EP1_OUT_ADDR, // EP number 1, OUT from host (rx to device)
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.bmAttributes = USB_TRANSFER_TYPE_BULK,
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.wMaxPacketSize = 64,
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.bInterval = 0
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};
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static const struct usb_endpoint_descriptor ep2_in = {
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.bLength = sizeof(struct usb_endpoint_descriptor),
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.bDescriptorType = USB_DT_ENDPOINT,
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.bEndpointAddress = EP2_IN_ADDR, // EP number 2, IN from host (tx from device)
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.bmAttributes = USB_TRANSFER_TYPE_BULK,
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.wMaxPacketSize = 64,
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.bInterval = 0
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};
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static const struct usb_configuration_descriptor config_descriptor = {
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.bLength = sizeof(struct usb_configuration_descriptor),
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.bDescriptorType = USB_DT_CONFIG,
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.wTotalLength = (sizeof(config_descriptor) +
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sizeof(interface_descriptor) +
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sizeof(ep1_out) +
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sizeof(ep2_in)),
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.bNumInterfaces = 1,
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.bConfigurationValue = 1, // Configuration 1
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.iConfiguration = 0, // No string
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.bmAttributes = 0xc0, // attributes: self powered, no remote wakeup
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.bMaxPower = 0x32 // 100ma
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};
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static const unsigned char lang_descriptor[] = {
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4, // bLength
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0x03, // bDescriptorType == String Descriptor
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0x09, 0x04 // language id = us english
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};
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static const unsigned char *descriptor_strings[] = {
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(unsigned char *) "Raspberry Pi", // Vendor
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(unsigned char *) "Pico Test Device" // Product
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};
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#endif |