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
185
186
187
|
#include "stm32.h"
#include "rcc.h"
#include "interrupt.h"
#include "thread.h"
#include "time.h"
#include "pin.h"
#include "usb.h"
static Pin& led_green = PD12;
static Pin& led_yellow = PD13;
static Pin& led_red = PD14;
static Pin& led_blue = PD15;
static Pin& usb_dm = PA11;
static Pin& usb_dp = PA12;
static Pin& usb_vbus = PA9;
void usb_write(uint32_t* bufp, uint32_t len) {
OTG_FS.dev_iep_reg[0].DIEPTSIZ = (1 << 19) | len;
// PKTCNT
OTG_FS.dev_iep_reg[0].DIEPCTL |= (1 << 31) | (1 << 26);
// EPENA CNAK
len = (len + 3) >> 2;
while(len--) {
OTG_FS.fifo = *bufp++;
}
}
uint32_t dev_desc[] = {0x02000112, 0x400000ff, 0x56781234, 0x00000000, 0x0100};
uint32_t conf_desc[] = {0x00090209, 0xc0000100, 0x00};
bool get_descriptor(uint16_t wValue, uint16_t wIndex, uint16_t wLength) {
switch(wValue) {
case 0x100:
usb_write(dev_desc, wLength);
return true;
case 0x200:
usb_write(conf_desc, wLength);
return true;
default:
return false;
}
}
bool set_address(uint16_t wValue, uint16_t wIndex, uint16_t wLength) {
OTG_FS.dev_reg.DCFG |= wValue << 4;
usb_write(0, 0);
return true;
}
void handle_setup(const uint32_t* bufp) {
led_red.toggle();
uint8_t bmRequestType = bufp[0] & 0xff;
uint8_t bRequest = (bufp[0] >> 8) & 0xff;
uint16_t wValue = (bufp[0] >> 16) & 0xffff;
uint16_t wIndex = bufp[1] & 0xffff;
uint16_t wLength = (bufp[1] >> 16) & 0xffff;
// GET_DESCRIPTOR
if(bmRequestType == 0x80 && bRequest == 0x06) {
if(get_descriptor(wValue, wIndex, wLength)) {
return;
}
}
// SET_ADDRESS
if(bmRequestType == 0x00 && bRequest == 0x05) {
if(set_address(wValue, wIndex, wLength)) {
return;
}
}
OTG_FS.dev_iep_reg[0].DIEPCTL |= (1 << 21);
}
static uint32_t buf[16];
void handle_rxfifo() {
uint32_t status = OTG_FS.reg.GRXSTSP;
uint32_t len = (status & 0x7ff0) >> 6;
for(uint32_t i = 0; i < len; i++) {
buf[i] = OTG_FS.fifo;
}
//if(status == 0x000c0080) {
if((status & (0xf << 17)) == (0x4 << 17)) {
handle_setup(buf);
OTG_FS.dev_oep_reg[0].DOEPCTL |= (1 << 26);
}
}
template<>
void interrupt<(Interrupt::IRQ)67>() {
//led_red.toggle();
// USB reset.
if(OTG_FS.reg.GINTSTS & (1 << 12)) {
led_yellow.toggle();
OTG_FS.dev_oep_reg[0].DOEPCTL = (1 << 27);
OTG_FS.dev_reg.DAINTMSK = (1 << 16) | 1;
OTG_FS.dev_reg.DOEPMSK = (1 << 3) | 1;
OTG_FS.dev_reg.DIEPEMPMSK = (1 << 3) | 1;
OTG_FS.reg.GRXFSIZ = 256;
OTG_FS.dev_oep_reg[0].DOEPTSIZ = (3 << 29);
}
// OTG interrupt.
if(OTG_FS.reg.GINTSTS & (1 << 2)) {
led_blue.toggle();
OTG_FS.reg.GOTGINT = (1 << 2); // SEDET
}
// RxFIFO non-empty.
if(OTG_FS.reg.GINTSTS & (1 << 4)) {
handle_rxfifo();
}
OTG_FS.reg.GINTSTS = 0xffffffff;
}
int main() {
// Initialize system timer.
STK.LOAD = 168000000 / 8 / 1000; // 1000 Hz.
STK.CTRL = 0x03;
RCC.enable(RCC.GPIOA);
RCC.enable(RCC.GPIOB);
RCC.enable(RCC.GPIOD);
led_green.set_mode(Pin::Output);
led_yellow.set_mode(Pin::Output);
led_red.set_mode(Pin::Output);
led_blue.set_mode(Pin::Output);
led_red.off();
led_blue.off();
led_yellow.off();
usb_vbus.set_mode(Pin::AF);
usb_vbus.set_pull(Pin::PullNone);
usb_vbus.set_af(10);
usb_dm.set_mode(Pin::AF);
usb_dm.set_pull(Pin::PullNone);
usb_dm.set_af(10);
usb_dp.set_mode(Pin::AF);
usb_dp.set_pull(Pin::PullNone);
usb_dp.set_af(10);
RCC.enable(RCC.OTGFS);
Interrupt::enable((Interrupt::IRQ)67);
OTG_FS.reg.GAHBCFG = 1;
//OTG_FS.reg.GRSTCTL |= 1;
//while(OTG_FS.reg.GRSTCTL & 1);
//Time::sleep(10);
// USB configuration
OTG_FS.reg.GUSBCFG = (1 << 30) | (0xf << 10) | (0 << 9) | (0 << 8);
// FDMOD TRDT HNPCAP SRPCAP
// interrupt mask
OTG_FS.reg.GINTMSK = (1 << 13) | (1 << 12) | (1 << 11) | (1 << 10) | (1 << 3) | (1 << 2) | (1 << 1) | (1 << 4);
// ENUMDNEM USBRST USBSUSPM ESUSPM SOFM OTGINT MMISM
// device configuration
OTG_FS.dev_reg.DCFG = (1 << 2) | 3;
// NZLSOHSK DSPD
// core configuration
OTG_FS.reg.GCCFG = (1 << 19) | (1 << 16);
// VBUSBSEN PWRDWN
while(1) {
led_green.toggle();
Time::sleep(100);
}
}
|
