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esp-idf/components/usb/usb_helpers.c

322 wiersze
13 KiB
C
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/*
* SPDX-FileCopyrightText: 2015-2022 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <stdint.h>
#include <stdbool.h>
#include <stdlib.h>
#include <assert.h>
#include <stdio.h>
#include <string.h>
#include "usb/usb_helpers.h"
#include "usb/usb_types_ch9.h"
#include "esp_check.h"
#include "usb/usb_host.h"
// ---------------------------------------- Configuration Descriptor Parsing -------------------------------------------
const usb_standard_desc_t *usb_parse_next_descriptor(const usb_standard_desc_t *cur_desc, uint16_t wTotalLength, int *offset)
{
assert(cur_desc != NULL && offset != NULL);
if (*offset >= wTotalLength) {
return NULL; // We have traversed the entire configuration descriptor
}
if (*offset + cur_desc->bLength >= wTotalLength) {
return NULL; // Next descriptor is out of bounds
}
// Return the next descriptor, update offset
const usb_standard_desc_t *ret_desc = (const usb_standard_desc_t *)(((uint32_t)cur_desc) + cur_desc->bLength);
*offset += cur_desc->bLength;
return ret_desc;
}
const usb_standard_desc_t *usb_parse_next_descriptor_of_type(const usb_standard_desc_t *cur_desc, uint16_t wTotalLength, uint8_t bDescriptorType, int *offset)
{
assert(cur_desc != NULL && offset != NULL);
int offset_temp = *offset; // We only want to update offset if we've actually found a descriptor
// Keep stepping over descriptors until we find one of bDescriptorType or until we go out of bounds
const usb_standard_desc_t *ret_desc = usb_parse_next_descriptor(cur_desc, wTotalLength, &offset_temp);
while (ret_desc != NULL) {
if (ret_desc->bDescriptorType == bDescriptorType) {
break;
}
ret_desc = usb_parse_next_descriptor(ret_desc, wTotalLength, &offset_temp);
}
if (ret_desc != NULL) {
// We've found a descriptor. Update the offset
*offset = offset_temp;
}
return ret_desc;
}
int usb_parse_interface_number_of_alternate(const usb_config_desc_t *config_desc, uint8_t bInterfaceNumber)
{
assert(config_desc != NULL);
int offset = 0;
// Find the first interface descriptor of bInterfaceNumber
const usb_intf_desc_t *first_intf_desc = usb_parse_interface_descriptor(config_desc, bInterfaceNumber, 0, &offset);
if (first_intf_desc == NULL) {
return -1; // bInterfaceNumber not found
}
int num_alt_setting = 0;
const usb_intf_desc_t *next_intf_desc = (const usb_intf_desc_t *)usb_parse_next_descriptor_of_type((const usb_standard_desc_t *)first_intf_desc, config_desc->wTotalLength, USB_B_DESCRIPTOR_TYPE_INTERFACE, &offset);
while (next_intf_desc != NULL) {
if (next_intf_desc->bInterfaceNumber != bInterfaceNumber) {
break;
}
num_alt_setting++;
next_intf_desc = (const usb_intf_desc_t *)usb_parse_next_descriptor_of_type((const usb_standard_desc_t *)next_intf_desc, config_desc->wTotalLength, USB_B_DESCRIPTOR_TYPE_INTERFACE, &offset);
}
return num_alt_setting;
}
const usb_intf_desc_t *usb_parse_interface_descriptor(const usb_config_desc_t *config_desc, uint8_t bInterfaceNumber, uint8_t bAlternateSetting, int *offset)
{
assert(config_desc != NULL);
// Walk to first interface descriptor of bInterfaceNumber
int offset_temp = 0;
const usb_intf_desc_t *next_intf_desc = (const usb_intf_desc_t *)usb_parse_next_descriptor_of_type((const usb_standard_desc_t *)config_desc, config_desc->wTotalLength, USB_B_DESCRIPTOR_TYPE_INTERFACE, &offset_temp);
while (next_intf_desc != NULL) {
if (next_intf_desc->bInterfaceNumber == bInterfaceNumber) {
break; // We found the first interface descriptor with matching bInterfaceNumber
}
next_intf_desc = (const usb_intf_desc_t *)usb_parse_next_descriptor_of_type((const usb_standard_desc_t *)next_intf_desc, config_desc->wTotalLength, USB_B_DESCRIPTOR_TYPE_INTERFACE, &offset_temp);
}
if (next_intf_desc == NULL) {
return NULL; // Couldn't find a interface with bInterfaceNumber
}
// Keep walking until an interface descriptor matching bInterfaceNumber and bAlternateSetting is found
while (next_intf_desc != NULL) {
if (next_intf_desc->bInterfaceNumber == bInterfaceNumber + 1) {
// We've walked past our target bInterfaceNumber
next_intf_desc = NULL;
break;
}
if (next_intf_desc->bAlternateSetting == bAlternateSetting) {
// We've found our target interface descriptor
break;
}
// Get the next interface descriptor
next_intf_desc = (const usb_intf_desc_t *)usb_parse_next_descriptor_of_type((const usb_standard_desc_t *)next_intf_desc, config_desc->wTotalLength, USB_B_DESCRIPTOR_TYPE_INTERFACE, &offset_temp);
}
if (next_intf_desc != NULL && offset != NULL) {
*offset = offset_temp;
}
return next_intf_desc;
}
const usb_ep_desc_t *usb_parse_endpoint_descriptor_by_index(const usb_intf_desc_t *intf_desc, int index, uint16_t wTotalLength, int *offset)
{
assert(intf_desc != NULL && offset != NULL);
if (index >= intf_desc->bNumEndpoints) {
return NULL; // Index is out of range
}
// Walk to the Nth endpoint descriptor we find
int offset_temp = *offset;
bool ep_found = true;
const usb_standard_desc_t *next_desc = (const usb_standard_desc_t *)intf_desc;
for (int i = 0; i <= index; i++) {
next_desc = usb_parse_next_descriptor_of_type((const usb_standard_desc_t *)next_desc, wTotalLength, USB_B_DESCRIPTOR_TYPE_ENDPOINT, &offset_temp);
if (next_desc == NULL) {
ep_found = false;
break;
}
}
if (ep_found) {
*offset = offset_temp;
return (const usb_ep_desc_t *)next_desc;
}
return NULL;
}
const usb_ep_desc_t *usb_parse_endpoint_descriptor_by_address(const usb_config_desc_t *config_desc, uint8_t bInterfaceNumber, uint8_t bAlternateSetting, uint8_t bEndpointAddress, int *offset)
{
assert(config_desc != NULL);
// Find the interface descriptor
int offset_intf;
const usb_intf_desc_t *intf_desc = usb_parse_interface_descriptor(config_desc, bInterfaceNumber, bAlternateSetting, &offset_intf);
if (intf_desc == NULL) {
return NULL;
}
// Walk endpoint descriptors until one matching bEndpointAddress is found
int offset_ep;
bool ep_found = false;
const usb_ep_desc_t *ep_desc = NULL;
for (int index = 0; index < intf_desc->bNumEndpoints; index++) {
offset_ep = offset_intf;
ep_desc = usb_parse_endpoint_descriptor_by_index(intf_desc, index, config_desc->wTotalLength, &offset_ep);
if (ep_desc == NULL) {
break;
}
if (ep_desc->bEndpointAddress == bEndpointAddress) {
ep_found = true;
break;
}
}
if (ep_found && offset != NULL) {
*offset = offset_ep;
}
return ep_desc;
}
// ----------------------------------------------- Descriptor Printing -------------------------------------------------
static void print_ep_desc(const usb_ep_desc_t *ep_desc)
{
const char *ep_type_str;
int type = ep_desc->bmAttributes & USB_BM_ATTRIBUTES_XFERTYPE_MASK;
switch (type) {
case USB_BM_ATTRIBUTES_XFER_CONTROL:
ep_type_str = "CTRL";
break;
case USB_BM_ATTRIBUTES_XFER_ISOC:
ep_type_str = "ISOC";
break;
case USB_BM_ATTRIBUTES_XFER_BULK:
ep_type_str = "BULK";
break;
case USB_BM_ATTRIBUTES_XFER_INT:
ep_type_str = "INT";
break;
default:
ep_type_str = NULL;
break;
}
printf("\t\t*** Endpoint descriptor ***\n");
printf("\t\tbLength %d\n", ep_desc->bLength);
printf("\t\tbDescriptorType %d\n", ep_desc->bDescriptorType);
printf("\t\tbEndpointAddress 0x%x\tEP %d %s\n", ep_desc->bEndpointAddress,
USB_EP_DESC_GET_EP_NUM(ep_desc),
USB_EP_DESC_GET_EP_DIR(ep_desc) ? "IN" : "OUT");
printf("\t\tbmAttributes 0x%x\t%s\n", ep_desc->bmAttributes, ep_type_str);
printf("\t\twMaxPacketSize %d\n", USB_EP_DESC_GET_MPS(ep_desc));
printf("\t\tbInterval %d\n", ep_desc->bInterval);
}
static void usbh_print_intf_desc(const usb_intf_desc_t *intf_desc)
{
printf("\t*** Interface descriptor ***\n");
printf("\tbLength %d\n", intf_desc->bLength);
printf("\tbDescriptorType %d\n", intf_desc->bDescriptorType);
printf("\tbInterfaceNumber %d\n", intf_desc->bInterfaceNumber);
printf("\tbAlternateSetting %d\n", intf_desc->bAlternateSetting);
printf("\tbNumEndpoints %d\n", intf_desc->bNumEndpoints);
printf("\tbInterfaceClass 0x%x\n", intf_desc->bInterfaceClass);
printf("\tbInterfaceSubClass 0x%x\n", intf_desc->bInterfaceSubClass);
printf("\tbInterfaceProtocol 0x%x\n", intf_desc->bInterfaceProtocol);
printf("\tiInterface %d\n", intf_desc->iInterface);
}
static void usbh_print_cfg_desc(const usb_config_desc_t *cfg_desc)
{
printf("*** Configuration descriptor ***\n");
printf("bLength %d\n", cfg_desc->bLength);
printf("bDescriptorType %d\n", cfg_desc->bDescriptorType);
printf("wTotalLength %d\n", cfg_desc->wTotalLength);
printf("bNumInterfaces %d\n", cfg_desc->bNumInterfaces);
printf("bConfigurationValue %d\n", cfg_desc->bConfigurationValue);
printf("iConfiguration %d\n", cfg_desc->iConfiguration);
printf("bmAttributes 0x%x\n", cfg_desc->bmAttributes);
printf("bMaxPower %dmA\n", cfg_desc->bMaxPower * 2);
}
static void print_iad_desc(const usb_iad_desc_t *iad_desc)
{
printf("*** Interface Association Descriptor ***\n");
printf("bLength %d\n", iad_desc->bLength);
printf("bDescriptorType %d\n", iad_desc->bDescriptorType);
printf("bFirstInterface %d\n", iad_desc->bFirstInterface);
printf("bInterfaceCount %d\n", iad_desc->bInterfaceCount);
printf("bFunctionClass 0x%x\n", iad_desc->bFunctionClass);
printf("bFunctionSubClass 0x%x\n", iad_desc->bFunctionSubClass);
printf("bFunctionProtocol 0x%x\n", iad_desc->bFunctionProtocol);
printf("iFunction %d\n", iad_desc->iFunction);
}
void usb_print_device_descriptor(const usb_device_desc_t *devc_desc)
{
if (devc_desc == NULL) {
return;
}
printf("*** Device descriptor ***\n");
printf("bLength %d\n", devc_desc->bLength);
printf("bDescriptorType %d\n", devc_desc->bDescriptorType);
printf("bcdUSB %d.%d0\n", ((devc_desc->bcdUSB >> 8) & 0xF), ((devc_desc->bcdUSB >> 4) & 0xF));
printf("bDeviceClass 0x%x\n", devc_desc->bDeviceClass);
printf("bDeviceSubClass 0x%x\n", devc_desc->bDeviceSubClass);
printf("bDeviceProtocol 0x%x\n", devc_desc->bDeviceProtocol);
printf("bMaxPacketSize0 %d\n", devc_desc->bMaxPacketSize0);
printf("idVendor 0x%x\n", devc_desc->idVendor);
printf("idProduct 0x%x\n", devc_desc->idProduct);
printf("bcdDevice %d.%d0\n", ((devc_desc->bcdDevice >> 8) & 0xF), ((devc_desc->bcdDevice >> 4) & 0xF));
printf("iManufacturer %d\n", devc_desc->iManufacturer);
printf("iProduct %d\n", devc_desc->iProduct);
printf("iSerialNumber %d\n", devc_desc->iSerialNumber);
printf("bNumConfigurations %d\n", devc_desc->bNumConfigurations);
}
void usb_print_config_descriptor(const usb_config_desc_t *cfg_desc, print_class_descriptor_cb class_specific_cb)
{
if (cfg_desc == NULL) {
return;
}
int offset = 0;
uint16_t wTotalLength = cfg_desc->wTotalLength;
const usb_standard_desc_t *next_desc = (const usb_standard_desc_t *)cfg_desc;
do {
switch (next_desc->bDescriptorType) {
case USB_B_DESCRIPTOR_TYPE_CONFIGURATION:
usbh_print_cfg_desc((const usb_config_desc_t *)next_desc);
break;
case USB_B_DESCRIPTOR_TYPE_INTERFACE:
usbh_print_intf_desc((const usb_intf_desc_t *)next_desc);
break;
case USB_B_DESCRIPTOR_TYPE_ENDPOINT:
print_ep_desc((const usb_ep_desc_t *)next_desc);
break;
case USB_B_DESCRIPTOR_TYPE_INTERFACE_ASSOCIATION:
print_iad_desc((const usb_iad_desc_t *)next_desc);
break;
default:
if (class_specific_cb) {
class_specific_cb(next_desc);
}
break;
}
next_desc = usb_parse_next_descriptor(next_desc, wTotalLength, &offset);
} while (next_desc != NULL);
}
void usb_print_string_descriptor(const usb_str_desc_t *str_desc)
{
if (str_desc == NULL) {
return;
}
for (int i = 0; i < str_desc->bLength / 2; i++) {
/*
USB String descriptors of UTF-16.
Right now We just skip any character larger than 0xFF to stay in BMP Basic Latin and Latin-1 Supplement range.
*/
if (str_desc->wData[i] > 0xFF) {
continue;
}
printf("%c", (char)str_desc->wData[i]);
}
printf("\n");
}
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