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Brooklyn/gnuk/chopstx/example-cdc-gnu-linux/usb-cdc.c

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#include <stdint.h>
#include <stdlib.h>
#include <chopstx.h>
#include <string.h>
#include "usb_lld.h"
#include "tty.h"
static chopstx_intr_t usb_intr;
struct line_coding
{
uint32_t bitrate;
uint8_t format;
uint8_t paritytype;
uint8_t datatype;
} __attribute__((packed));
static const struct line_coding line_coding0 = {
115200, /* baud rate: 115200 */
0x00, /* stop bits: 1 */
0x00, /* parity: none */
0x08 /* bits: 8 */
};
/*
* Currently, we only support a single TTY.
*
* It is possible to extend to support multiple TTYs, for multiple
* interfaces.
*
* In that case, add argument to TTY_OPEN function and
* modify TTY_GET function to get the TTY structure. Functions which
* directy accesses TTY0 (usb_device_reset and usb_set_configuration)
* should be modified, too.
*
* Modification of TTY_MAIN thread will be also needed to echo back
* input for each TTY, and the thread should run if one of TTY is
* opened.
*/
struct tty {
chopstx_mutex_t mtx;
chopstx_cond_t cnd;
uint8_t inputline[LINEBUFSIZE]; /* Line editing is supported */
uint8_t send_buf[LINEBUFSIZE]; /* Sending ring buffer for echo back */
uint8_t send_buf0[64];
uint8_t recv_buf0[64];
uint32_t inputline_len : 8;
uint32_t send_head : 8;
uint32_t send_tail : 8;
uint32_t flag_connected : 1;
uint32_t flag_send_ready : 1;
uint32_t flag_input_avail : 1;
uint32_t : 2;
uint32_t device_state : 3; /* USB device status */
struct line_coding line_coding;
};
static struct tty tty0;
/*
* Locate TTY structure from interface number or endpoint number.
* Currently, it always returns tty0, because we only have the one.
*/
static struct tty *
tty_get (int interface, uint8_t ep_num)
{
struct tty *t = &tty0;
if (interface >= 0)
{
if (interface == 0)
t = &tty0;
}
else
{
if (ep_num == ENDP1 || ep_num == ENDP2 || ep_num == ENDP3)
t = &tty0;
}
return t;
}
#define USB_CDC_REQ_SET_LINE_CODING 0x20
#define USB_CDC_REQ_GET_LINE_CODING 0x21
#define USB_CDC_REQ_SET_CONTROL_LINE_STATE 0x22
#define USB_CDC_REQ_SEND_BREAK 0x23
/* USB Device Descriptor */
static const uint8_t vcom_device_desc[18] = {
18, /* bLength */
DEVICE_DESCRIPTOR, /* bDescriptorType */
0x10, 0x01, /* bcdUSB = 1.1 */
0x02, /* bDeviceClass (CDC). */
0x00, /* bDeviceSubClass. */
0x00, /* bDeviceProtocol. */
0x40, /* bMaxPacketSize. */
0xFF, 0xFF, /* idVendor */
0x01, 0x00, /* idProduct */
0x00, 0x01, /* bcdDevice */
1, /* iManufacturer. */
2, /* iProduct. */
3, /* iSerialNumber. */
1 /* bNumConfigurations. */
};
#define VCOM_FEATURE_BUS_POWERED 0x80
/* Configuration Descriptor tree for a CDC.*/
static const uint8_t vcom_config_desc[67] = {
9,
CONFIG_DESCRIPTOR, /* bDescriptorType: Configuration */
/* Configuration Descriptor.*/
67, 0x00, /* wTotalLength. */
0x02, /* bNumInterfaces. */
0x01, /* bConfigurationValue. */
0, /* iConfiguration. */
VCOM_FEATURE_BUS_POWERED, /* bmAttributes. */
50, /* bMaxPower (100mA). */
/* Interface Descriptor.*/
9,
INTERFACE_DESCRIPTOR,
0x00, /* bInterfaceNumber. */
0x00, /* bAlternateSetting. */
0x01, /* bNumEndpoints. */
0x02, /* bInterfaceClass (Communications Interface Class,
CDC section 4.2). */
0x02, /* bInterfaceSubClass (Abstract Control Model, CDC
section 4.3). */
0x01, /* bInterfaceProtocol (AT commands, CDC section
4.4). */
0, /* iInterface. */
/* Header Functional Descriptor (CDC section 5.2.3).*/
5, /* bLength. */
0x24, /* bDescriptorType (CS_INTERFACE). */
0x00, /* bDescriptorSubtype (Header Functional Descriptor). */
0x10, 0x01, /* bcdCDC. */
/* Call Management Functional Descriptor. */
5, /* bFunctionLength. */
0x24, /* bDescriptorType (CS_INTERFACE). */
0x01, /* bDescriptorSubtype (Call Management Functional
Descriptor). */
0x03, /* bmCapabilities (D0+D1). */
0x01, /* bDataInterface. */
/* ACM Functional Descriptor.*/
4, /* bFunctionLength. */
0x24, /* bDescriptorType (CS_INTERFACE). */
0x02, /* bDescriptorSubtype (Abstract Control Management
Descriptor). */
0x02, /* bmCapabilities. */
/* Union Functional Descriptor.*/
5, /* bFunctionLength. */
0x24, /* bDescriptorType (CS_INTERFACE). */
0x06, /* bDescriptorSubtype (Union Functional
Descriptor). */
0x00, /* bMasterInterface (Communication Class
Interface). */
0x01, /* bSlaveInterface0 (Data Class Interface). */
/* Endpoint 2 Descriptor.*/
7,
ENDPOINT_DESCRIPTOR,
ENDP2|0x80, /* bEndpointAddress. */
0x03, /* bmAttributes (Interrupt). */
0x08, 0x00, /* wMaxPacketSize. */
0xFF, /* bInterval. */
/* Interface Descriptor.*/
9,
INTERFACE_DESCRIPTOR, /* bDescriptorType: */
0x01, /* bInterfaceNumber. */
0x00, /* bAlternateSetting. */
0x02, /* bNumEndpoints. */
0x0A, /* bInterfaceClass (Data Class Interface, CDC section 4.5). */
0x00, /* bInterfaceSubClass (CDC section 4.6). */
0x00, /* bInterfaceProtocol (CDC section 4.7). */
0x00, /* iInterface. */
/* Endpoint 3 Descriptor.*/
7,
ENDPOINT_DESCRIPTOR, /* bDescriptorType: Endpoint */
ENDP3, /* bEndpointAddress. */
0x02, /* bmAttributes (Bulk). */
0x40, 0x00, /* wMaxPacketSize. */
0x00, /* bInterval. */
/* Endpoint 1 Descriptor.*/
7,
ENDPOINT_DESCRIPTOR, /* bDescriptorType: Endpoint */
ENDP1|0x80, /* bEndpointAddress. */
0x02, /* bmAttributes (Bulk). */
0x40, 0x00, /* wMaxPacketSize. */
0x00 /* bInterval. */
};
/*
* U.S. English language identifier.
*/
static const uint8_t vcom_string0[4] = {
4, /* bLength */
STRING_DESCRIPTOR,
0x09, 0x04 /* LangID = 0x0409: US-English */
};
static const uint8_t vcom_string1[] = {
23*2+2, /* bLength */
STRING_DESCRIPTOR, /* bDescriptorType */
/* Manufacturer: "Flying Stone Technology" */
'F', 0, 'l', 0, 'y', 0, 'i', 0, 'n', 0, 'g', 0, ' ', 0, 'S', 0,
't', 0, 'o', 0, 'n', 0, 'e', 0, ' ', 0, 'T', 0, 'e', 0, 'c', 0,
'h', 0, 'n', 0, 'o', 0, 'l', 0, 'o', 0, 'g', 0, 'y', 0,
};
static const uint8_t vcom_string2[] = {
14*2+2, /* bLength */
STRING_DESCRIPTOR, /* bDescriptorType */
/* Product name: "Chopstx Sample" */
'C', 0, 'h', 0, 'o', 0, 'p', 0, 's', 0, 't', 0, 'x', 0, ' ', 0,
'S', 0, 'a', 0, 'm', 0, 'p', 0, 'l', 0, 'e', 0,
};
/*
* Serial Number string.
*/
static const uint8_t vcom_string3[28] = {
28, /* bLength */
STRING_DESCRIPTOR, /* bDescriptorType */
'0', 0, '.', 0, '0', 0, '0', 0, /* Version number */
};
#define NUM_INTERFACES 2
static void
usb_device_reset (struct usb_dev *dev)
{
usb_lld_reset (dev, VCOM_FEATURE_BUS_POWERED);
/* Initialize Endpoint 0 */
usb_lld_setup_endp (dev, ENDP0, 1, 1);
chopstx_mutex_lock (&tty0.mtx);
tty0.inputline_len = 0;
tty0.send_head = tty0.send_tail = 0;
tty0.flag_connected = 0;
tty0.flag_send_ready = 1;
tty0.flag_input_avail = 0;
tty0.device_state = USB_DEVICE_STATE_ATTACHED;
memcpy (&tty0.line_coding, &line_coding0, sizeof (struct line_coding));
chopstx_mutex_unlock (&tty0.mtx);
}
#define CDC_CTRL_DTR 0x0001
static void
usb_ctrl_write_finish (struct usb_dev *dev)
{
struct device_req *arg = &dev->dev_req;
uint8_t type_rcp = arg->type & (REQUEST_TYPE|RECIPIENT);
if (type_rcp == (CLASS_REQUEST | INTERFACE_RECIPIENT) && arg->index == 0
&& USB_SETUP_SET (arg->type)
&& arg->request == USB_CDC_REQ_SET_CONTROL_LINE_STATE)
{
struct tty *t = tty_get (arg->index, 0);
/* Open/close the connection. */
chopstx_mutex_lock (&t->mtx);
t->flag_connected = ((arg->value & CDC_CTRL_DTR) != 0);
chopstx_cond_signal (&t->cnd);
chopstx_mutex_unlock (&t->mtx);
}
/*
* The transaction was already finished. So, it is no use to call
* usb_lld_ctrl_error when the condition does not match.
*/
}
static int
vcom_port_data_setup (struct usb_dev *dev)
{
struct device_req *arg = &dev->dev_req;
if (USB_SETUP_GET (arg->type))
{
struct tty *t = tty_get (arg->index, 0);
if (arg->request == USB_CDC_REQ_GET_LINE_CODING)
return usb_lld_ctrl_send (dev, &t->line_coding,
sizeof (struct line_coding));
}
else /* USB_SETUP_SET (req) */
{
if (arg->request == USB_CDC_REQ_SET_LINE_CODING
&& arg->len == sizeof (struct line_coding))
{
struct tty *t = tty_get (arg->index, 0);
return usb_lld_ctrl_recv (dev, &t->line_coding,
sizeof (struct line_coding));
}
else if (arg->request == USB_CDC_REQ_SET_CONTROL_LINE_STATE)
return usb_lld_ctrl_ack (dev);
}
return -1;
}
static int
usb_setup (struct usb_dev *dev)
{
struct device_req *arg = &dev->dev_req;
uint8_t type_rcp = arg->type & (REQUEST_TYPE|RECIPIENT);
if (type_rcp == (CLASS_REQUEST | INTERFACE_RECIPIENT) && arg->index == 0)
return vcom_port_data_setup (dev);
return -1;
}
static int
usb_get_descriptor (struct usb_dev *dev)
{
struct device_req *arg = &dev->dev_req;
uint8_t rcp = arg->type & RECIPIENT;
uint8_t desc_type = (arg->value >> 8);
uint8_t desc_index = (arg->value & 0xff);
if (rcp != DEVICE_RECIPIENT)
return -1;
if (desc_type == DEVICE_DESCRIPTOR)
return usb_lld_ctrl_send (dev,
vcom_device_desc, sizeof (vcom_device_desc));
else if (desc_type == CONFIG_DESCRIPTOR)
return usb_lld_ctrl_send (dev,
vcom_config_desc, sizeof (vcom_config_desc));
else if (desc_type == STRING_DESCRIPTOR)
{
const uint8_t *str;
int size;
switch (desc_index)
{
case 0:
str = vcom_string0;
size = sizeof (vcom_string0);
break;
case 1:
str = vcom_string1;
size = sizeof (vcom_string1);
break;
case 2:
str = vcom_string2;
size = sizeof (vcom_string2);
break;
case 3:
str = vcom_string3;
size = sizeof (vcom_string3);
break;
default:
return -1;
}
return usb_lld_ctrl_send (dev, str, size);
}
return -1;
}
static void
vcom_setup_endpoints_for_interface (struct usb_dev *dev,
uint16_t interface, int stop)
{
if (interface == 0)
{
if (!stop)
usb_lld_setup_endp (dev, ENDP2, 0, 1);
else
usb_lld_stall_tx (ENDP2);
}
else if (interface == 1)
{
if (!stop)
{
usb_lld_setup_endp (dev, ENDP1, 0, 1);
usb_lld_setup_endp (dev, ENDP3, 1, 0);
/* Start with no data receiving (ENDP3 not enabled)*/
}
else
{
usb_lld_stall_tx (ENDP1);
usb_lld_stall_rx (ENDP3);
}
}
}
static int
usb_set_configuration (struct usb_dev *dev)
{
int i;
uint8_t current_conf;
current_conf = usb_lld_current_configuration (dev);
if (current_conf == 0)
{
if (dev->dev_req.value != 1)
return -1;
usb_lld_set_configuration (dev, 1);
for (i = 0; i < NUM_INTERFACES; i++)
vcom_setup_endpoints_for_interface (dev, i, 0);
chopstx_mutex_lock (&tty0.mtx);
tty0.device_state = USB_DEVICE_STATE_CONFIGURED;
chopstx_cond_signal (&tty0.cnd);
chopstx_mutex_unlock (&tty0.mtx);
}
else if (current_conf != dev->dev_req.value)
{
if (dev->dev_req.value != 0)
return -1;
usb_lld_set_configuration (dev, 0);
for (i = 0; i < NUM_INTERFACES; i++)
vcom_setup_endpoints_for_interface (dev, i, 1);
chopstx_mutex_lock (&tty0.mtx);
tty0.device_state = USB_DEVICE_STATE_ADDRESSED;
chopstx_cond_signal (&tty0.cnd);
chopstx_mutex_unlock (&tty0.mtx);
}
return usb_lld_ctrl_ack (dev);
}
static int
usb_set_interface (struct usb_dev *dev)
{
uint16_t interface = dev->dev_req.index;
uint16_t alt = dev->dev_req.value;
if (interface >= NUM_INTERFACES)
return -1;
if (alt != 0)
return -1;
else
{
vcom_setup_endpoints_for_interface (dev, interface, 0);
return usb_lld_ctrl_ack (dev);
}
}
static int
usb_get_interface (struct usb_dev *dev)
{
const uint8_t zero = 0;
uint16_t interface = dev->dev_req.index;
if (interface >= NUM_INTERFACES)
return -1;
/* We don't have alternate interface, so, always return 0. */
return usb_lld_ctrl_send (dev, &zero, 1);
}
static int
usb_get_status_interface (struct usb_dev *dev)
{
const uint16_t status_info = 0;
uint16_t interface = dev->dev_req.index;
if (interface >= NUM_INTERFACES)
return -1;
return usb_lld_ctrl_send (dev, &status_info, 2);
}
/*
* Put a character into the ring buffer to be send back.
*/
static void
put_char_to_ringbuffer (struct tty *t, int c)
{
uint32_t next = (t->send_tail + 1) % LINEBUFSIZE;
if (t->send_head == next)
/* full */
/* All that we can do is ignore this char. */
return;
t->send_buf[t->send_tail] = c;
t->send_tail = next;
}
/*
* Get characters from ring buffer into S.
*/
static int
get_chars_from_ringbuffer (struct tty *t, uint8_t *s, int len)
{
int i = 0;
if (t->send_head == t->send_tail)
/* Empty */
return i;
do
{
s[i++] = t->send_buf[t->send_head];
t->send_head = (t->send_head + 1) % LINEBUFSIZE;
}
while (t->send_head != t->send_tail && i < len);
return i;
}
static void
tty_echo_char (struct tty *t, int c)
{
put_char_to_ringbuffer (t, c);
}
static void
usb_tx_done (uint8_t ep_num, uint16_t len)
{
struct tty *t = tty_get (-1, ep_num);
(void)len;
if (ep_num == ENDP1)
{
chopstx_mutex_lock (&t->mtx);
if (t->flag_send_ready == 0)
{
t->flag_send_ready = 1;
chopstx_cond_signal (&t->cnd);
}
chopstx_mutex_unlock (&t->mtx);
}
else if (ep_num == ENDP2)
{
/* Nothing */
}
}
static int
tty_input_char (struct tty *t, int c)
{
unsigned int i;
int r = 0;
/* Process DEL, C-U, C-R, and RET as editing command. */
chopstx_mutex_lock (&t->mtx);
switch (c)
{
case 0x0d: /* Control-M */
t->inputline[t->inputline_len++] = '\n';
tty_echo_char (t, 0x0d);
tty_echo_char (t, 0x0a);
t->flag_input_avail = 1;
r = 1;
chopstx_cond_signal (&t->cnd);
break;
case 0x12: /* Control-R */
tty_echo_char (t, '^');
tty_echo_char (t, 'R');
tty_echo_char (t, 0x0d);
tty_echo_char (t, 0x0a);
for (i = 0; i < t->inputline_len; i++)
tty_echo_char (t, t->inputline[i]);
break;
case 0x15: /* Control-U */
for (i = 0; i < t->inputline_len; i++)
{
tty_echo_char (t, 0x08);
tty_echo_char (t, 0x20);
tty_echo_char (t, 0x08);
}
t->inputline_len = 0;
break;
case 0x7f: /* DEL */
if (t->inputline_len > 0)
{
tty_echo_char (t, 0x08);
tty_echo_char (t, 0x20);
tty_echo_char (t, 0x08);
t->inputline_len--;
}
break;
default:
if (t->inputline_len < sizeof (t->inputline) - 1)
{
tty_echo_char (t, c);
t->inputline[t->inputline_len++] = c;
}
else
/* Beep */
tty_echo_char (t, 0x0a);
break;
}
chopstx_mutex_unlock (&t->mtx);
return r;
}
static void
usb_rx_ready (uint8_t ep_num, uint16_t len)
{
struct tty *t = tty_get (-1, ep_num);
if (ep_num == ENDP3)
{
int i;
for (i = 0; i < len; i++)
if (tty_input_char (t, t->recv_buf0[i]))
break;
chopstx_mutex_lock (&t->mtx);
if (t->flag_input_avail == 0)
usb_lld_rx_enable_buf (ENDP3, t->recv_buf0, 64);
chopstx_mutex_unlock (&t->mtx);
}
}
static void *tty_main (void *arg);
#define PRIO_TTY 4
static char __process3_stack_base__[4096];
#define STACK_ADDR_TTY ((uintptr_t)__process3_stack_base__)
#define STACK_SIZE_TTY (sizeof __process3_stack_base__)
struct tty *
tty_open (void)
{
chopstx_mutex_init (&tty0.mtx);
chopstx_cond_init (&tty0.cnd);
tty0.inputline_len = 0;
tty0.send_head = tty0.send_tail = 0;
tty0.flag_connected = 0;
tty0.flag_send_ready = 1;
tty0.flag_input_avail = 0;
tty0.device_state = USB_DEVICE_STATE_UNCONNECTED;
memcpy (&tty0.line_coding, &line_coding0, sizeof (struct line_coding));
chopstx_create (PRIO_TTY, STACK_ADDR_TTY, STACK_SIZE_TTY, tty_main, &tty0);
return &tty0;
}
static void *
tty_main (void *arg)
{
struct tty *t = arg;
struct usb_dev dev;
int e;
#if defined(OLDER_SYS_H)
/*
* Historically (before sys < 3.0), NVIC priority setting for USB
* interrupt was done in usb_lld_sys_init. Thus this code.
*
* When USB interrupt occurs between usb_lld_init (which assumes
* ISR) and chopstx_claim_irq (which clears pending interrupt),
* invocation of usb_lld_event_handler won't occur.
*
* Calling usb_lld_event_handler is no harm even if there were no
* interrupts, thus, we call it unconditionally here, just in case
* if there is a request.
*
* We can't call usb_lld_init after chopstx_claim_irq, as
* usb_lld_init does its own setting for NVIC. Calling
* chopstx_claim_irq after usb_lld_init overrides that.
*
*/
usb_lld_init (&dev, VCOM_FEATURE_BUS_POWERED);
chopstx_claim_irq (&usb_intr, INTR_REQ_USB);
goto event_handle;
#else
chopstx_claim_irq (&usb_intr, INTR_REQ_USB);
usb_lld_init (&dev, VCOM_FEATURE_BUS_POWERED);
#endif
while (1)
{
chopstx_intr_wait (&usb_intr);
if (usb_intr.ready)
{
uint8_t ep_num;
#if defined(OLDER_SYS_H)
event_handle:
#endif
/*
* When interrupt is detected, call usb_lld_event_handler.
* The event may be one of following:
* (1) Transfer to endpoint (bulk or interrupt)
* In this case EP_NUM is encoded in the variable E.
* (2) "NONE" event: some trasfer was done, but all was
* done by lower layer, no other work is needed in
* upper layer.
* (3) Device events: Reset or Suspend
* (4) Device requests to the endpoint zero.
*
*/
e = usb_lld_event_handler (&dev);
chopstx_intr_done (&usb_intr);
ep_num = USB_EVENT_ENDP (e);
if (ep_num != 0)
{
if (USB_EVENT_TXRX (e))
usb_tx_done (ep_num, USB_EVENT_LEN (e));
else
usb_rx_ready (ep_num, USB_EVENT_LEN (e));
}
else
switch (USB_EVENT_ID (e))
{
case USB_EVENT_DEVICE_RESET:
usb_device_reset (&dev);
continue;
case USB_EVENT_DEVICE_ADDRESSED:
/* The addres is assigned to the device. We don't
* need to do anything for this actually, but in this
* application, we maintain the USB status of the
* device. Usually, just "continue" as EVENT_OK is
* OK.
*/
chopstx_mutex_lock (&tty0.mtx);
tty0.device_state = USB_DEVICE_STATE_ADDRESSED;
chopstx_cond_signal (&tty0.cnd);
chopstx_mutex_unlock (&tty0.mtx);
continue;
case USB_EVENT_GET_DESCRIPTOR:
if (usb_get_descriptor (&dev) < 0)
usb_lld_ctrl_error (&dev);
continue;
case USB_EVENT_SET_CONFIGURATION:
if (usb_set_configuration (&dev) < 0)
usb_lld_ctrl_error (&dev);
continue;
case USB_EVENT_SET_INTERFACE:
if (usb_set_interface (&dev) < 0)
usb_lld_ctrl_error (&dev);
continue;
case USB_EVENT_CTRL_REQUEST:
/* Device specific device request. */
if (usb_setup (&dev) < 0)
usb_lld_ctrl_error (&dev);
continue;
case USB_EVENT_GET_STATUS_INTERFACE:
if (usb_get_status_interface (&dev) < 0)
usb_lld_ctrl_error (&dev);
continue;
case USB_EVENT_GET_INTERFACE:
if (usb_get_interface (&dev) < 0)
usb_lld_ctrl_error (&dev);
continue;
case USB_EVENT_SET_FEATURE_DEVICE:
case USB_EVENT_SET_FEATURE_ENDPOINT:
case USB_EVENT_CLEAR_FEATURE_DEVICE:
case USB_EVENT_CLEAR_FEATURE_ENDPOINT:
usb_lld_ctrl_ack (&dev);
continue;
case USB_EVENT_CTRL_WRITE_FINISH:
/* Control WRITE transfer finished. */
usb_ctrl_write_finish (&dev);
continue;
case USB_EVENT_OK:
case USB_EVENT_DEVICE_SUSPEND:
default:
continue;
}
}
chopstx_mutex_lock (&t->mtx);
if (t->device_state == USB_DEVICE_STATE_CONFIGURED && t->flag_connected
&& t->flag_send_ready)
{
uint8_t line[32];
int len = get_chars_from_ringbuffer (t, line, sizeof (len));
if (len)
{
memcpy (t->send_buf0, line, len);
usb_lld_tx_enable_buf (ENDP1, t->send_buf0, len);
t->flag_send_ready = 0;
}
}
chopstx_mutex_unlock (&t->mtx);
}
return NULL;
}
void
tty_wait_configured (struct tty *t)
{
chopstx_mutex_lock (&t->mtx);
while (t->device_state != USB_DEVICE_STATE_CONFIGURED)
chopstx_cond_wait (&t->cnd, &t->mtx);
chopstx_mutex_unlock (&t->mtx);
}
void
tty_wait_connection (struct tty *t)
{
chopstx_mutex_lock (&t->mtx);
while (t->flag_connected == 0)
chopstx_cond_wait (&t->cnd, &t->mtx);
t->flag_send_ready = 1;
t->flag_input_avail = 0;
t->send_head = t->send_tail = 0;
t->inputline_len = 0;
usb_lld_rx_enable_buf (ENDP3, t->recv_buf0, 64); /* Accept input for line */
chopstx_mutex_unlock (&t->mtx);
}
static int
check_tx (struct tty *t)
{
if (t->flag_send_ready)
/* TX done */
return 1;
if (t->flag_connected == 0)
/* Disconnected */
return -1;
return 0;
}
int
tty_send (struct tty *t, const char *buf, int len)
{
int r;
const char *p;
int count;
p = buf;
count = len >= 64 ? 64 : len;
while (1)
{
chopstx_mutex_lock (&t->mtx);
while ((r = check_tx (t)) == 0)
chopstx_cond_wait (&t->cnd, &t->mtx);
if (r > 0)
{
usb_lld_tx_enable_buf (ENDP1, p, count);
t->flag_send_ready = 0;
}
chopstx_mutex_unlock (&t->mtx);
len -= count;
p += count;
if (len == 0 && count != 64)
/*
* The size of the last packet should be != 0
* If 64, send ZLP (zelo length packet)
*/
break;
count = len >= 64 ? 64 : len;
}
/* Wait until all sent. */
chopstx_mutex_lock (&t->mtx);
while ((r = check_tx (t)) == 0)
chopstx_cond_wait (&t->cnd, &t->mtx);
chopstx_mutex_unlock (&t->mtx);
return r;
}
static int
check_rx (void *arg)
{
struct tty *t = arg;
if (t->flag_input_avail)
/* RX */
return 1;
if (t->flag_connected == 0)
/* Disconnected */
return 1;
return 0;
}
/*
* Returns -1 on connection close
* 0 on timeout.
* >0 length of the inputline (including final \n)
*
*/
int
tty_recv (struct tty *t, char *buf, uint32_t *timeout)
{
int r;
chopstx_poll_cond_t poll_desc;
poll_desc.type = CHOPSTX_POLL_COND;
poll_desc.ready = 0;
poll_desc.cond = &t->cnd;
poll_desc.mutex = &t->mtx;
poll_desc.check = check_rx;
poll_desc.arg = t;
while (1)
{
struct chx_poll_head *pd_array[1] = {
(struct chx_poll_head *)&poll_desc
};
chopstx_poll (timeout, 1, pd_array);
chopstx_mutex_lock (&t->mtx);
r = check_rx (t);
chopstx_mutex_unlock (&t->mtx);
if (r || (timeout != NULL && *timeout == 0))
break;
}
chopstx_mutex_lock (&t->mtx);
if (t->flag_connected == 0)
r = -1;
else if (t->flag_input_avail)
{
r = t->inputline_len;
memcpy (buf, t->inputline, r);
t->flag_input_avail = 0;
usb_lld_rx_enable_buf (ENDP3, t->recv_buf0, 64);
t->inputline_len = 0;
}
else
r = 0;
chopstx_mutex_unlock (&t->mtx);
return r;
}