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
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
|
// Hardware interface to SAM4 USB Device Port
//
// Copyright (C) 2018 Kevin O'Connor <kevin@koconnor.net>
//
// This file may be distributed under the terms of the GNU GPLv3 license.
#include <string.h> // NULL
#include "board/armcm_boot.h" // armcm_enable_irq
#include "board/irq.h" // irq_disable
#include "board/usb_cdc.h" // usb_notify_ep0
#include "board/usb_cdc_ep.h" // USB_CDC_EP_BULK_IN
#include "command.h" // DECL_CONSTANT_STR
#include "internal.h" // UDP
#include "sched.h" // DECL_INIT
#define CSR_EP0 (UDP_CSR_EPTYPE_CTRL | UDP_CSR_EPEDS)
#define CSR_ACM (UDP_CSR_EPTYPE_INT_IN | UDP_CSR_EPEDS)
#define CSR_BULK_OUT (UDP_CSR_EPTYPE_BULK_OUT | UDP_CSR_EPEDS)
#define CSR_BULK_IN (UDP_CSR_EPTYPE_BULK_IN | UDP_CSR_EPEDS)
static void
usb_write_packet(uint32_t ep, const uint8_t *data, uint32_t len)
{
while (len--)
UDP->UDP_FDR[ep] = *data++;
}
static uint32_t
usb_read_packet(uint32_t ep, uint32_t csr, uint8_t *data, uint32_t max_len)
{
uint32_t pk_len = (csr & UDP_CSR_RXBYTECNT_Msk) >> UDP_CSR_RXBYTECNT_Pos;
uint32_t len = pk_len < max_len ? pk_len : max_len, orig_len = len;
while (len--)
*data++ = UDP->UDP_FDR[ep];
return orig_len;
}
int_fast8_t
usb_read_bulk_out(void *data, uint_fast8_t max_len)
{
static uint32_t next_bk = UDP_CSR_RX_DATA_BK0;
const uint32_t other_irqs = (UDP_CSR_RXSETUP | UDP_CSR_STALLSENT
| UDP_CSR_TXCOMP);
uint32_t csr = UDP->UDP_CSR[USB_CDC_EP_BULK_OUT];
uint32_t bk = csr & (UDP_CSR_RX_DATA_BK0 | UDP_CSR_RX_DATA_BK1);
if (!bk) {
// Not ready to receive data
if (csr & other_irqs)
UDP->UDP_CSR[USB_CDC_EP_BULK_OUT] = (
CSR_BULK_OUT | UDP_CSR_RX_DATA_BK0 | UDP_CSR_RX_DATA_BK1);
UDP->UDP_IER = 1<<USB_CDC_EP_BULK_OUT;
return -1;
}
uint32_t len = usb_read_packet(USB_CDC_EP_BULK_OUT, csr, data, max_len);
if (bk == (UDP_CSR_RX_DATA_BK0 | UDP_CSR_RX_DATA_BK1))
bk = next_bk;
next_bk = bk ^ (UDP_CSR_RX_DATA_BK0 | UDP_CSR_RX_DATA_BK1);
UDP->UDP_CSR[USB_CDC_EP_BULK_OUT] = CSR_BULK_OUT | next_bk;
return len;
}
int_fast8_t
usb_send_bulk_in(void *data, uint_fast8_t len)
{
const uint32_t other_irqs = (UDP_CSR_RXSETUP | UDP_CSR_STALLSENT
| UDP_CSR_RX_DATA_BK0 | UDP_CSR_RX_DATA_BK1);
uint32_t csr = UDP->UDP_CSR[USB_CDC_EP_BULK_IN];
if (csr & UDP_CSR_TXPKTRDY) {
// Not ready to send
if (csr & other_irqs)
UDP->UDP_CSR[USB_CDC_EP_BULK_IN] = CSR_BULK_IN | UDP_CSR_TXCOMP;
UDP->UDP_IER = 1<<USB_CDC_EP_BULK_IN;
return -1;
}
usb_write_packet(USB_CDC_EP_BULK_IN, data, len);
UDP->UDP_CSR[USB_CDC_EP_BULK_IN] = CSR_BULK_IN | UDP_CSR_TXPKTRDY;
return len;
}
int_fast8_t
usb_read_ep0(void *data, uint_fast8_t max_len)
{
const uint32_t other_irqs = (UDP_CSR_RXSETUP | UDP_CSR_STALLSENT
| UDP_CSR_TXCOMP | UDP_CSR_RX_DATA_BK1);
uint32_t csr = UDP->UDP_CSR[0];
if (csr & other_irqs)
return -2;
if (!(csr & UDP_CSR_RX_DATA_BK0)) {
// Not ready to receive data
UDP->UDP_IER = 1<<0;
return -1;
}
uint32_t len = usb_read_packet(0, csr, data, max_len);
if (UDP->UDP_CSR[0] & other_irqs)
return -2;
UDP->UDP_CSR[0] = CSR_EP0 | other_irqs;
return len;
}
int_fast8_t
usb_read_ep0_setup(void *data, uint_fast8_t max_len)
{
const uint32_t other_irqs = (UDP_CSR_STALLSENT | UDP_CSR_TXCOMP
| UDP_CSR_RX_DATA_BK0 | UDP_CSR_RX_DATA_BK1);
uint32_t csr = UDP->UDP_CSR[0];
if (!(csr & UDP_CSR_RXSETUP)) {
// No data ready to read
if (csr & other_irqs)
UDP->UDP_CSR[0] = CSR_EP0 | UDP_CSR_RXSETUP;
UDP->UDP_IER = 1<<0;
return -1;
}
uint32_t len = usb_read_packet(0, csr, data, max_len);
uint32_t dir = *(uint8_t*)data & 0x80 ? UDP_CSR_DIR : 0;
UDP->UDP_CSR[0] = CSR_EP0 | dir;
return len;
}
int_fast8_t
usb_send_ep0(const void *data, uint_fast8_t len)
{
const uint32_t other_irqs = (UDP_CSR_RXSETUP | UDP_CSR_STALLSENT
| UDP_CSR_RX_DATA_BK0 | UDP_CSR_RX_DATA_BK1);
uint32_t csr = UDP->UDP_CSR[0];
if (csr & other_irqs)
return -2;
if (csr & UDP_CSR_TXPKTRDY) {
// Not ready to send
UDP->UDP_IER = 1<<0;
return -1;
}
usb_write_packet(0, data, len);
uint32_t dir = csr & UDP_CSR_DIR;
UDP->UDP_CSR[0] = CSR_EP0 | dir | UDP_CSR_TXPKTRDY | other_irqs;
return len;
}
void
usb_stall_ep0(void)
{
UDP->UDP_CSR[0] = CSR_EP0 | UDP_CSR_FORCESTALL;
UDP->UDP_IER = 1<<0;
}
static uint32_t set_address;
void
usb_set_address(uint_fast8_t addr)
{
set_address = addr | UDP_FADDR_FEN;
usb_send_ep0(NULL, 0);
UDP->UDP_IER = 1<<0;
}
void
usb_set_configure(void)
{
UDP->UDP_CSR[USB_CDC_EP_ACM] = CSR_ACM;
UDP->UDP_CSR[USB_CDC_EP_BULK_OUT] = CSR_BULK_OUT;
UDP->UDP_CSR[USB_CDC_EP_BULK_IN] = CSR_BULK_IN;
UDP->UDP_GLB_STAT |= UDP_GLB_STAT_CONFG;
}
// Configure endpoint 0 after usb reset completes
static void
handle_end_reset(void)
{
UDP->UDP_ICR = UDP_ISR_ENDBUSRES;
UDP->UDP_CSR[0] = CSR_EP0;
UDP->UDP_IER = 1<<0;
UDP->UDP_TXVC = UDP_TXVC_PUON;
}
void
UDP_Handler(void)
{
uint32_t s = UDP->UDP_ISR;
UDP->UDP_IDR = s;
if (s & UDP_ISR_ENDBUSRES)
handle_end_reset();
if (s & UDP_ISR_RXRSM)
UDP->UDP_ICR = UDP_ISR_RXRSM;
if (s & (1<<0)) {
usb_notify_ep0();
if (set_address && UDP->UDP_CSR[0] & UDP_CSR_TXCOMP) {
// Ack from set_address command sent - now update address
UDP->UDP_FADDR = set_address;
UDP->UDP_GLB_STAT |= UDP_GLB_STAT_FADDEN;
set_address = 0;
}
}
if (s & (1<<USB_CDC_EP_BULK_OUT))
usb_notify_bulk_out();
if (s & (1<<USB_CDC_EP_BULK_IN))
usb_notify_bulk_in();
}
DECL_CONSTANT_STR("RESERVE_PINS_USB", "PB10,PB11");
void
usbserial_init(void)
{
// Enable clocks
enable_pclock(ID_UDP);
PMC->PMC_USB = PMC_USB_USBDIV(5 - 1); // PLLA=240Mhz; divide by 5 for 48Mhz
PMC->PMC_SCER = PMC_SCER_UDP;
// Enable USB pullup
UDP->UDP_TXVC = UDP_TXVC_PUON | UDP_TXVC_TXVDIS;
// Enable interrupts
UDP->UDP_ICR = 0xffffffff;
armcm_enable_irq(UDP_Handler, UDP_IRQn, 1);
}
DECL_INIT(usbserial_init);
|
