1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
|
#include "cdc-acm.h"
#include "cusb.h"
#include "proto.h"
#include "../gpio.h"
#include "../addrmap.h"
void cdc_acm_ep1_in_handler(u8 *buffer, int len);
void cdc_acm_ep2_in_handler(u8 *buffer, int len);
void cdc_acm_ep3_out_handler(u8 *buffer, int len);
void cdc_acm_setup_handler(UD_SETUP *pkt);
void cdc_acm_setup_ack_handler(void);
void cdc_acm_eoi(void);
u8 configuration_descriptor[128];
u8 *send_buffer;
u8 send_buffer_size=0;
u8 *recv_buffer;
u8 recv_buffer_size=0;
DeviceConfiguration CDC_ACM_CONFIG ={
.device_descriptor = {
.bDeviceClass = USB_DEVICE_CLASS_CDC,
.idProduct = 1,
.iManufacturer = 1, // String id 1
.iProduct = 2 // String id 2
},
.configuration_descriptor = {
.bNumInterfaces = 2
},
.interface_descriptors = {
{
.bInterfaceClass = USB_INTERFACE_CLASS_COMMUNICATION,
.bInterfaceSubClass = USB_INTERFACE_SUBCLASS_ACM,
.bInterfaceProtocol = USB_INTERFACE_COMMUNICATION_PROTOCOL_NOPROTO,
.bInterfaceNumber = 0,
.bNumEndpoints = 1 // SHOULD BE 1 (IT IS 0 BECAUSE GET_CONFIG DESCRIPTOR MUST BE UPDATED)
},
{
.bInterfaceClass = USB_INTERFACE_CLASS_DATA,
.bInterfaceProtocol = USB_INTERFACE_COMMUNICATION_PROTOCOL_NOPROTO,
.bInterfaceNumber = 1,
.bNumEndpoints = 2
}
},
.endpoints = {
{
.endpoint_descriptor = {
.bEndpointAddress = B_ENDPOINT_ADDRESS(1, USB_DIRECTION_IN),
.wMaxPacketSize=64,
.bmAttributes = USB_TRANSFERT_TYPE_INTERRUPT,
.bInterval = 0
},
.handler = cdc_acm_ep1_in_handler
},
{
.endpoint_descriptor = {
.bEndpointAddress = B_ENDPOINT_ADDRESS(2, USB_DIRECTION_IN),
.wMaxPacketSize=64,
.bmAttributes = USB_TRANSFERT_TYPE_BULK,
.bInterval = 0
},
.handler = cdc_acm_ep2_in_handler
},
{
.endpoint_descriptor = {
.bEndpointAddress = B_ENDPOINT_ADDRESS(3, USB_DIRECTION_OUT),
.wMaxPacketSize=64,
.bmAttributes = USB_TRANSFERT_TYPE_BULK,
.bInterval = 0
},
.handler = cdc_acm_ep3_out_handler
},
},
.descriptor_strings = {
"Raspberry Pi", // Vendor
"Pico RP2040" // Product
},
.supported_languages = {
.wLANGID0 = USB_LANG_ENGLISH_US
},
.setup_handler = cdc_acm_setup_handler,
.setup_ack_handler = cdc_acm_setup_ack_handler,
.eoi=cdc_acm_eoi
};
void usb_cdc_acm_init(void) {
cusb_init(&CDC_ACM_CONFIG);
USB_CDC_ACM_FUNCTIONAL_DESCRIPTOR f;
f.header_descriptor.bFunctionLength=sizeof(USB_CDC_HEADER_FUNCTIONAL_DESCRIPTOR);
f.header_descriptor.bDescriptorType=0x24;
f.header_descriptor.bcdCDC=0b0110;
f.acm_descriptor.bFunctionLength=sizeof(USB_ACM_FUNCTIONAL_DESCRIPTOR);
f.acm_descriptor.bDescriptorType=0x24;
f.acm_descriptor.bDescriptorSubtype=0x02;
f.acm_descriptor.bmCapabilities=0xf;
f.union_descriptor.bFunctionLength=sizeof(USB_UNION_INTERFACE_DESCRIPTOR);
f.union_descriptor.bDescriptorType=0x24;
f.union_descriptor.bDescriptorSubtype=0x06;
f.union_descriptor.bMasterInterface=0;
f.union_descriptor.bSlaveInterface0=1;
// ----- Setting-up full configuration descriptor -----
u8 *ptr=configuration_descriptor;
// Configuration descriptor
memcpy(ptr,(void*) &(CDC_ACM_CONFIG.configuration_descriptor), sizeof(USB_CONFIGURATION_DESCRIPTOR));
ptr+=sizeof(USB_CONFIGURATION_DESCRIPTOR);
// Communication interface descriptor
memcpy(ptr,(void*) &(CDC_ACM_CONFIG.interface_descriptors[0]), sizeof(USB_INTERFACE_DESCRIPTOR));
ptr+=sizeof(USB_INTERFACE_DESCRIPTOR);
memcpy(ptr,(void*) &f, sizeof(USB_CDC_ACM_FUNCTIONAL_DESCRIPTOR)); // Functional descriptor
ptr+=sizeof(USB_CDC_ACM_FUNCTIONAL_DESCRIPTOR);
memcpy(ptr,(void*) &(CDC_ACM_CONFIG.endpoints[0].endpoint_descriptor), sizeof(USB_ENDPOINT_DESCRIPTOR)); // Endpoint descriptor
ptr+=sizeof(USB_ENDPOINT_DESCRIPTOR);
// Data interface descriptor
memcpy(ptr,(void*) &(CDC_ACM_CONFIG.interface_descriptors[1]), sizeof(USB_INTERFACE_DESCRIPTOR));
ptr+=sizeof(USB_INTERFACE_DESCRIPTOR);
memcpy(ptr,(void*) &(CDC_ACM_CONFIG.endpoints[1].endpoint_descriptor), sizeof(USB_ENDPOINT_DESCRIPTOR));
ptr+=sizeof(USB_ENDPOINT_DESCRIPTOR);
memcpy(ptr,(void*) &(CDC_ACM_CONFIG.endpoints[2].endpoint_descriptor), sizeof(USB_ENDPOINT_DESCRIPTOR));
ptr+=sizeof(USB_ENDPOINT_DESCRIPTOR);
// Setup full descriptor length
USB_CONFIGURATION_DESCRIPTOR *conf=(USB_CONFIGURATION_DESCRIPTOR*)configuration_descriptor;
conf->wTotalLength=ptr-configuration_descriptor;
// Finalize
CDC_ACM_CONFIG.full_configuration_descriptor=configuration_descriptor;
// Start receiving from host
cusb_start_xfer(0,64,&(CDC_ACM_CONFIG.endpoints[2]));
}
void cdc_acm_ep1_in_handler(u8 *buffer, int len) {}
void cdc_acm_ep2_in_handler(u8 *buffer, int len) {
send_buffer_size=0;
}
void cdc_acm_ep3_out_handler(u8 *buffer, int len) {
if(recv_buffer_size){
memcpy(recv_buffer, buffer, len);
recv_buffer_size=0; // Prevent further receive until usb_cdc_acm_recv() is called again
cusb_start_xfer(0,64,&(CDC_ACM_CONFIG.endpoints[2]));
}
}
void cdc_acm_setup_handler(UD_SETUP *pkt){
u8 direction=pkt->bmRequestType & BM_REQUEST_TYPE_DIR_BIT;
if(pkt->bRequest == USB_REQUEST_CODE_SET_LINE_CODING){
// TODO
}
else if(pkt->bRequest == USB_REQUEST_CODE_SET_CONTROL_LINE_STATE){
// TODO
}
else if(pkt->bRequest == USB_REQUEST_CODE_SEND_BREAK){
// TODO
}
else {
// TODO
}
}
void cdc_acm_setup_ack_handler(void){
}
void cdc_acm_eoi(void){
if(send_buffer_size)
cusb_start_xfer(send_buffer,send_buffer_size,&(CDC_ACM_CONFIG.endpoints[1]));
}
void usb_cdc_acm_send(char *data, int size){
send_buffer=data;
send_buffer_size=size;
cusb_isr_trigger();
while(send_buffer_size){};
}
void usb_cdc_acm_recv(char *data, int size){
recv_buffer=data;
recv_buffer_size=size;
while(recv_buffer_size){}
}
|
