cdcacm.c 10 KB
Newer Older
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
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
/*******************************************************************************
 * Copyright (C) 2016 Maxim Integrated Products, Inc., All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 * IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES
 * OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 *
 * Except as contained in this notice, the name of Maxim Integrated
 * Products, Inc. shall not be used except as stated in the Maxim Integrated
 * Products, Inc. Branding Policy.
 *
 * The mere transfer of this software does not imply any licenses
 * of trade secrets, proprietary technology, copyrights, patents,
 * trademarks, maskwork rights, or any other form of intellectual
 * property whatsoever. Maxim Integrated Products, Inc. retains all
 * ownership rights.
 *
 * $Id: main.c 32120 2017-11-28 23:51:11Z lorne.smith $
 *
 *******************************************************************************
 */

/**
 * @file    main.c
 * @brief   USB CDC-ACM example
 * @details This project creates a virtual COM port, which loops back data sent to it.
 *          Load the project, connect a cable from the PC to the USB connector
 *          on the Evaluation Kit, and observe that the PC now recognizes a new COM port.
 *          A driver for the COM port, if needed, is located in the Driver/ subdirectory.
 *
 */

#include <stdio.h>
#include <stddef.h>
#include "mxc_config.h"
#include "mxc_sys.h"
#include "mxc_delay.h"
#include "board.h"
#include "led.h"
#include "usb.h"
#include "usb_event.h"
#include "enumerate.h"
#include "cdc_acm.h"
#include "descriptors.h"


/***** Definitions *****/
#define EVENT_ENUM_COMP     MAXUSB_NUM_EVENTS

#define BUFFER_SIZE  64

#define STRINGIFY(x) #x
#define TOSTRING(x) STRINGIFY(x)

/***** Global Data *****/
volatile int configured;
volatile int suspended;
volatile unsigned int event_flags;
int remote_wake_en;

/***** Function Prototypes *****/
static int setconfig_callback(usb_setup_pkt *sud, void *cbdata);
static int setfeature_callback(usb_setup_pkt *sud, void *cbdata);
static int clrfeature_callback(usb_setup_pkt *sud, void *cbdata);
static int event_callback(maxusb_event_t evt, void *data);
static void usb_app_sleep(void);
static void usb_app_wakeup(void);
static int usb_read_callback(void);
//static void echo_usb(void);

/***** File Scope Variables *****/

/* This EP assignment must match the Configuration Descriptor */
static const acm_cfg_t acm_cfg = {
  1,                  /* EP OUT */
  MXC_USBHS_MAX_PACKET, /* OUT max packet size */
  2,                  /* EP IN */
  MXC_USBHS_MAX_PACKET, /* IN max packet size */
  3,                  /* EP Notify */
  MXC_USBHS_MAX_PACKET, /* Notify max packet size */
};

static volatile int usb_read_complete;

int usb_startup_cb()
{
    const sys_cfg_usbhs_t sys_usbhs_cfg = NULL;
    return SYS_USBHS_Init(&sys_usbhs_cfg);
}

int usb_shutdown_cb()
{
    return SYS_USBHS_Shutdown();
}

/* User-supplied function to delay usec micro-seconds */
void delay_us(unsigned int usec)
{
    /* mxc_delay() takes unsigned long, so can't use it directly */
    mxc_delay(usec);
}


/******************************************************************************/
void cdcacm_init(void)
{
    maxusb_cfg_options_t usb_opts;

    /* Initialize state */
    configured = 0;
    suspended = 0;
    event_flags = 0;
    remote_wake_en = 0;

    /* Start out in full speed */
    usb_opts.enable_hs = 0;
    usb_opts.delay_us = delay_us; /* Function which will be used for delays */
    usb_opts.init_callback = usb_startup_cb;
    usb_opts.shutdown_callback = usb_shutdown_cb;

    /* Initialize the usb module */
    if (usb_init(&usb_opts) != 0) {
        printf("usb_init() failed\n");
        while (1);
    }

    /* Initialize the enumeration module */
    if (enum_init() != 0) {
        printf("enum_init() failed\n");
        while (1);
    }

    /* Register enumeration data */
    enum_register_descriptor(ENUM_DESC_DEVICE, (uint8_t*)&device_descriptor, 0);
    enum_register_descriptor(ENUM_DESC_CONFIG, (uint8_t*)&config_descriptor, 0);
    enum_register_descriptor(ENUM_DESC_STRING, lang_id_desc, 0);
    enum_register_descriptor(ENUM_DESC_STRING, mfg_id_desc, 1);
    enum_register_descriptor(ENUM_DESC_STRING, prod_id_desc, 2);

    /* Handle configuration */
    enum_register_callback(ENUM_SETCONFIG, setconfig_callback, NULL);

    /* Handle feature set/clear */
    enum_register_callback(ENUM_SETFEATURE, setfeature_callback, NULL);
    enum_register_callback(ENUM_CLRFEATURE, clrfeature_callback, NULL);

    /* Initialize the class driver */
    if (acm_init(&config_descriptor.comm_interface_descriptor) != 0) {
        printf("acm_init() failed\n");
        while (1);
    }

    /* Register callbacks */
    usb_event_enable(MAXUSB_EVENT_NOVBUS, event_callback, NULL);
    usb_event_enable(MAXUSB_EVENT_VBUS, event_callback, NULL);
    acm_register_callback(ACM_CB_READ_READY, usb_read_callback);
    usb_read_complete = 0;

    /* Start with USB in low power mode */
    usb_app_sleep();
    NVIC_EnableIRQ(USB_IRQn);
}

int cdcacm_num_read_avail(void)
{
    return acm_canread();
}

uint8_t cdcacm_read(void)
{
    while(acm_canread() <= 0) {
    }

    uint8_t buf;
    acm_read(&buf, 1);
    return buf;
}

void cdcacm_write(uint8_t *data, int len)
{
    while (acm_present()) {
        // TODO: This might fail horribly
        if (acm_write(data, len) == len) {
            break;
        }
    }
}


/******************************************************************************/
#if 0
static void echo_usb(void)
{
  int chars;
  uint8_t buffer[BUFFER_SIZE];
  
  if ((chars = acm_canread()) > 0) {

    if (chars > BUFFER_SIZE) {
      chars = BUFFER_SIZE;
    }

    // Read the data from USB
    if (acm_read(buffer, chars) != chars) {
      printf("acm_read() failed\n");
      return;
    }

    // Echo it back
    if (acm_present()) {
      if (acm_write(buffer, chars) != chars) {
        printf("acm_write() failed\n");
      }
    }
  }
}
#endif
/******************************************************************************/
static int setconfig_callback(usb_setup_pkt *sud, void *cbdata)
{
    /* Confirm the configuration value */
    if (sud->wValue == config_descriptor.config_descriptor.bConfigurationValue) {
        configured = 1;
        MXC_SETBIT(&event_flags, EVENT_ENUM_COMP);
        return acm_configure(&acm_cfg); /* Configure the device class */
    } else if (sud->wValue == 0) {
        configured = 0;
        return acm_deconfigure();
    }

    return -1;
}

/******************************************************************************/
static int setfeature_callback(usb_setup_pkt *sud, void *cbdata)
{
    if(sud->wValue == FEAT_REMOTE_WAKE) {
        remote_wake_en = 1;
    } else {
        // Unknown callback
        return -1;
    }

    return 0;
}

/******************************************************************************/
static int clrfeature_callback(usb_setup_pkt *sud, void *cbdata)
{
    if(sud->wValue == FEAT_REMOTE_WAKE) {
        remote_wake_en = 0;
    } else {
        // Unknown callback
        return -1;
    }
    
    return 0;
}

/******************************************************************************/
static void usb_app_sleep(void)
{
    /* TODO: Place low-power code here */
    suspended = 1;
}

/******************************************************************************/
static void usb_app_wakeup(void)
{
    /* TODO: Place low-power code here */
    suspended = 0;
}

/******************************************************************************/
static int event_callback(maxusb_event_t evt, void *data)
{
    /* Set event flag */
    MXC_SETBIT(&event_flags, evt);

    switch (evt) {
        case MAXUSB_EVENT_NOVBUS:
            usb_event_disable(MAXUSB_EVENT_BRST);
            usb_event_disable(MAXUSB_EVENT_SUSP);
            usb_event_disable(MAXUSB_EVENT_DPACT);
            usb_disconnect();
            configured = 0;
            enum_clearconfig();
            acm_deconfigure();
            usb_app_sleep();
            break;
        case MAXUSB_EVENT_VBUS:
            usb_event_clear(MAXUSB_EVENT_BRST);
            usb_event_enable(MAXUSB_EVENT_BRST, event_callback, NULL);
            usb_event_clear(MAXUSB_EVENT_SUSP);
            usb_event_enable(MAXUSB_EVENT_SUSP, event_callback, NULL);
            usb_connect();
            usb_app_sleep();
            break;
        case MAXUSB_EVENT_BRST:
            usb_app_wakeup();
            enum_clearconfig();
            acm_deconfigure();
            configured = 0;
            suspended = 0;
            break;
        case MAXUSB_EVENT_SUSP:
            usb_app_sleep();
            break;
        case MAXUSB_EVENT_DPACT:
            usb_app_wakeup();
            break;
        default:
            break;
    }

    return 0;
}

/******************************************************************************/
static int usb_read_callback(void)
{
    usb_read_complete = 1;
    return 0;
}

/******************************************************************************/
void USB_IRQHandler(void)
{
    usb_event_handler();
}

/******************************************************************************/
Rahix's avatar
Rahix committed
347
348
/* TODO: We probably need to fix something related to this */
#if 0
349
350
351
352
void SysTick_Handler(void)
{
    mxc_delay_handler();
}
Rahix's avatar
Rahix committed
353
#endif /* 0 */