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Expand all USB serial 2 & 3 stuff (needed for Arduino IDE use)

teensy4-core
PaulStoffregen 5 年前
父节点
405371e633
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cd4c30fde5
共有 5 个文件被更改，包括 880 次插入 和 38 次删除
合并视图 显示文件统计
  1. +144
    -4
      teensy3/usb_desc.c
  2. +269
    -9
      teensy3/usb_serial2.c
  3. +99
    -8
      teensy3/usb_serial2.h
  4. +269
    -9
      teensy3/usb_serial3.c
  5. +99
    -8
      teensy3/usb_serial3.h

+ 144
- 4
teensy3/usb_desc.c 查看文件

#endif // CDC_DATA_INTERFACE #endif // CDC_DATA_INTERFACE


#ifdef CDC2_DATA_INTERFACE #ifdef CDC2_DATA_INTERFACE
EMIT_CDC_IAD_DESCRIPTOR(CDC2),
EMIT_CDC_DESCRIPTORS(CDC2),
// interface association descriptor, USB ECN, Table 9-Z
8, // bLength
11, // bDescriptorType
CDC2_STATUS_INTERFACE, // bFirstInterface
2, // bInterfaceCount
0x02, // bFunctionClass
0x02, // bFunctionSubClass
0x01, // bFunctionProtocol
0, // iFunction
// interface descriptor, USB spec 9.6.5, page 267-269, Table 9-12
9, // bLength
4, // bDescriptorType
CDC2_STATUS_INTERFACE, // bInterfaceNumber
0, // bAlternateSetting
1, // bNumEndpoints
0x02, // bInterfaceClass
0x02, // bInterfaceSubClass
0x01, // bInterfaceProtocol
0, // iInterface
// CDC Header Functional Descriptor, CDC Spec 5.2.3.1, Table 26
5, // bFunctionLength
0x24, // bDescriptorType
0x00, // bDescriptorSubtype
0x10, 0x01, // bcdCDC
// Call Management Functional Descriptor, CDC Spec 5.2.3.2, Table 27
5, // bFunctionLength
0x24, // bDescriptorType
0x01, // bDescriptorSubtype
0x01, // bmCapabilities
1, // bDataInterface
// Abstract Control Management Functional Descriptor, CDC Spec 5.2.3.3, Table 28
4, // bFunctionLength
0x24, // bDescriptorType
0x02, // bDescriptorSubtype
0x06, // bmCapabilities
// Union Functional Descriptor, CDC Spec 5.2.3.8, Table 33
5, // bFunctionLength
0x24, // bDescriptorType
0x06, // bDescriptorSubtype
CDC2_STATUS_INTERFACE, // bMasterInterface
CDC2_DATA_INTERFACE, // bSlaveInterface0
// endpoint descriptor, USB spec 9.6.6, page 269-271, Table 9-13
7, // bLength
5, // bDescriptorType
CDC2_ACM_ENDPOINT | 0x80, // bEndpointAddress
0x03, // bmAttributes (0x03=intr)
CDC2_ACM_SIZE, 0, // wMaxPacketSize
64, // bInterval
// interface descriptor, USB spec 9.6.5, page 267-269, Table 9-12
9, // bLength
4, // bDescriptorType
CDC2_DATA_INTERFACE, // bInterfaceNumber
0, // bAlternateSetting
2, // bNumEndpoints
0x0A, // bInterfaceClass
0x00, // bInterfaceSubClass
0x00, // bInterfaceProtocol
0, // iInterface
// endpoint descriptor, USB spec 9.6.6, page 269-271, Table 9-13
7, // bLength
5, // bDescriptorType
CDC2_RX_ENDPOINT, // bEndpointAddress
0x02, // bmAttributes (0x02=bulk)
CDC2_RX_SIZE, 0, // wMaxPacketSize
0, // bInterval
// endpoint descriptor, USB spec 9.6.6, page 269-271, Table 9-13
7, // bLength
5, // bDescriptorType
CDC2_TX_ENDPOINT | 0x80, // bEndpointAddress
0x02, // bmAttributes (0x02=bulk)
CDC2_TX_SIZE, 0, // wMaxPacketSize
0, // bInterval
#endif // CDC2_DATA_INTERFACE #endif // CDC2_DATA_INTERFACE


#ifdef CDC3_DATA_INTERFACE #ifdef CDC3_DATA_INTERFACE
EMIT_CDC_IAD_DESCRIPTOR(CDC3),
EMIT_CDC_DESCRIPTORS(CDC3),
// interface association descriptor, USB ECN, Table 9-Z
8, // bLength
11, // bDescriptorType
CDC3_STATUS_INTERFACE, // bFirstInterface
2, // bInterfaceCount
0x02, // bFunctionClass
0x02, // bFunctionSubClass
0x01, // bFunctionProtocol
0, // iFunction
// interface descriptor, USB spec 9.6.5, page 267-269, Table 9-12
9, // bLength
4, // bDescriptorType
CDC3_STATUS_INTERFACE, // bInterfaceNumber
0, // bAlternateSetting
1, // bNumEndpoints
0x02, // bInterfaceClass
0x02, // bInterfaceSubClass
0x01, // bInterfaceProtocol
0, // iInterface
// CDC Header Functional Descriptor, CDC Spec 5.2.3.1, Table 26
5, // bFunctionLength
0x24, // bDescriptorType
0x00, // bDescriptorSubtype
0x10, 0x01, // bcdCDC
// Call Management Functional Descriptor, CDC Spec 5.2.3.2, Table 27
5, // bFunctionLength
0x24, // bDescriptorType
0x01, // bDescriptorSubtype
0x01, // bmCapabilities
1, // bDataInterface
// Abstract Control Management Functional Descriptor, CDC Spec 5.2.3.3, Table 28
4, // bFunctionLength
0x24, // bDescriptorType
0x02, // bDescriptorSubtype
0x06, // bmCapabilities
// Union Functional Descriptor, CDC Spec 5.2.3.8, Table 33
5, // bFunctionLength
0x24, // bDescriptorType
0x06, // bDescriptorSubtype
CDC3_STATUS_INTERFACE, // bMasterInterface
CDC3_DATA_INTERFACE, // bSlaveInterface0
// endpoint descriptor, USB spec 9.6.6, page 269-271, Table 9-13
7, // bLength
5, // bDescriptorType
CDC3_ACM_ENDPOINT | 0x80, // bEndpointAddress
0x03, // bmAttributes (0x03=intr)
CDC3_ACM_SIZE, 0, // wMaxPacketSize
64, // bInterval
// interface descriptor, USB spec 9.6.5, page 267-269, Table 9-12
9, // bLength
4, // bDescriptorType
CDC3_DATA_INTERFACE, // bInterfaceNumber
0, // bAlternateSetting
2, // bNumEndpoints
0x0A, // bInterfaceClass
0x00, // bInterfaceSubClass
0x00, // bInterfaceProtocol
0, // iInterface
// endpoint descriptor, USB spec 9.6.6, page 269-271, Table 9-13
7, // bLength
5, // bDescriptorType
CDC3_RX_ENDPOINT, // bEndpointAddress
0x02, // bmAttributes (0x02=bulk)
CDC3_RX_SIZE, 0, // wMaxPacketSize
0, // bInterval
// endpoint descriptor, USB spec 9.6.6, page 269-271, Table 9-13
7, // bLength
5, // bDescriptorType
CDC3_TX_ENDPOINT | 0x80, // bEndpointAddress
0x02, // bmAttributes (0x02=bulk)
CDC3_TX_SIZE, 0, // wMaxPacketSize
0, // bInterval
#endif // CDC3_DATA_INTERFACE #endif // CDC3_DATA_INTERFACE


#ifdef MIDI_INTERFACE #ifdef MIDI_INTERFACE

+ 269
- 9
teensy3/usb_serial2.c 查看文件

*/ */


#include "usb_dev.h" #include "usb_dev.h"
#include "usb_serial3.h"
#include "core_pins.h" // for yield()
//#include "HardwareSerial.h"
#include <string.h> // for memcpy()


// defined by usb_dev.h -> usb_desc.h // defined by usb_dev.h -> usb_desc.h
#if defined(CDC2_STATUS_INTERFACE) && defined(CDC2_DATA_INTERFACE)

#if defined(CDC3_STATUS_INTERFACE) && defined(CDC3_DATA_INTERFACE)
#if F_CPU >= 20000000 #if F_CPU >= 20000000
#include "usb_serial_port.h"


struct usb_serial_port usb_serial2_instance = {
.cdc_rx_endpoint = CDC2_RX_ENDPOINT,
.cdc_tx_endpoint = CDC2_TX_ENDPOINT,
.cdc_tx_size = CDC2_TX_SIZE,
};
uint32_t usb_cdc3_line_coding[2];
volatile uint32_t usb_cdc3_line_rtsdtr_millis;
volatile uint8_t usb_cdc3_line_rtsdtr=0;
volatile uint8_t usb_cdc3_transmit_flush_timer=0;

static usb_packet_t *rx_packet=NULL;
static usb_packet_t *tx_packet=NULL;
static volatile uint8_t tx_noautoflush=0;

#define TRANSMIT_FLUSH_TIMEOUT 5 /* in milliseconds */

// get the next character, or -1 if nothing received
int usb_serial3_getchar(void)
{
unsigned int i;
int c;

if (!rx_packet) {
if (!usb_configuration) return -1;
rx_packet = usb_rx(CDC3_RX_ENDPOINT);
if (!rx_packet) return -1;
}
i = rx_packet->index;
c = rx_packet->buf[i++];
if (i >= rx_packet->len) {
usb_free(rx_packet);
rx_packet = NULL;
} else {
rx_packet->index = i;
}
return c;
}

// peek at the next character, or -1 if nothing received
int usb_serial3_peekchar(void)
{
if (!rx_packet) {
if (!usb_configuration) return -1;
rx_packet = usb_rx(CDC3_RX_ENDPOINT);
if (!rx_packet) return -1;
}
if (!rx_packet) return -1;
return rx_packet->buf[rx_packet->index];
}

// number of bytes available in the receive buffer
int usb_serial3_available(void)
{
int count;
count = usb_rx_byte_count(CDC3_RX_ENDPOINT);
if (rx_packet) count += rx_packet->len - rx_packet->index;
return count;
}

// read a block of bytes to a buffer
int usb_serial3_read(void *buffer, uint32_t size)
{
uint8_t *p = (uint8_t *)buffer;
uint32_t qty, count=0;

while (size) {
if (!usb_configuration) break;
if (!rx_packet) {
rx:
rx_packet = usb_rx(CDC3_RX_ENDPOINT);
if (!rx_packet) break;
if (rx_packet->len == 0) {
usb_free(rx_packet);
goto rx;
}
}
qty = rx_packet->len - rx_packet->index;
if (qty > size) qty = size;
memcpy(p, rx_packet->buf + rx_packet->index, qty);
p += qty;
count += qty;
size -= qty;
rx_packet->index += qty;
if (rx_packet->index >= rx_packet->len) {
usb_free(rx_packet);
rx_packet = NULL;
}
}
return count;
}

// discard any buffered input
void usb_serial3_flush_input(void)
{
usb_packet_t *rx;

if (!usb_configuration) return;
if (rx_packet) {
usb_free(rx_packet);
rx_packet = NULL;
}
while (1) {
rx = usb_rx(CDC3_RX_ENDPOINT);
if (!rx) break;
usb_free(rx);
}
}

// Maximum number of transmit packets to queue so we don't starve other endpoints for memory
#define TX_PACKET_LIMIT 8

// When the PC isn't listening, how long do we wait before discarding data? If this is
// too short, we risk losing data during the stalls that are common with ordinary desktop
// software. If it's too long, we stall the user's program when no software is running.
#define TX_TIMEOUT_MSEC 70
#if F_CPU == 256000000
#define TX_TIMEOUT (TX_TIMEOUT_MSEC * 1706)
#elif F_CPU == 240000000
#define TX_TIMEOUT (TX_TIMEOUT_MSEC * 1600)
#elif F_CPU == 216000000
#define TX_TIMEOUT (TX_TIMEOUT_MSEC * 1440)
#elif F_CPU == 192000000
#define TX_TIMEOUT (TX_TIMEOUT_MSEC * 1280)
#elif F_CPU == 180000000
#define TX_TIMEOUT (TX_TIMEOUT_MSEC * 1200)
#elif F_CPU == 168000000
#define TX_TIMEOUT (TX_TIMEOUT_MSEC * 1100)
#elif F_CPU == 144000000
#define TX_TIMEOUT (TX_TIMEOUT_MSEC * 932)
#elif F_CPU == 120000000
#define TX_TIMEOUT (TX_TIMEOUT_MSEC * 764)
#elif F_CPU == 96000000
#define TX_TIMEOUT (TX_TIMEOUT_MSEC * 596)
#elif F_CPU == 72000000
#define TX_TIMEOUT (TX_TIMEOUT_MSEC * 512)
#elif F_CPU == 48000000
#define TX_TIMEOUT (TX_TIMEOUT_MSEC * 428)
#elif F_CPU == 24000000
#define TX_TIMEOUT (TX_TIMEOUT_MSEC * 262)
#endif #endif


#endif // CDC2_STATUS_INTERFACE && CDC2_DATA_INTERFACE
// When we've suffered the transmit timeout, don't wait again until the computer
// begins accepting data. If no software is running to receive, we'll just discard
// data as rapidly as Serial.print() can generate it, until there's something to
// actually receive it.
static uint8_t transmit_previous_timeout=0;


// transmit a character. 0 returned on success, -1 on error
int usb_serial3_putchar(uint8_t c)
{
return usb_serial3_write(&c, 1);
}


int usb_serial3_write(const void *buffer, uint32_t size)
{
uint32_t ret = size;
uint32_t len;
uint32_t wait_count;
const uint8_t *src = (const uint8_t *)buffer;
uint8_t *dest;

tx_noautoflush = 1;
while (size > 0) {
if (!tx_packet) {
wait_count = 0;
while (1) {
if (!usb_configuration) {
tx_noautoflush = 0;
return -1;
}
if (usb_tx_packet_count(CDC3_TX_ENDPOINT) < TX_PACKET_LIMIT) {
tx_noautoflush = 1;
tx_packet = usb_malloc();
if (tx_packet) break;
tx_noautoflush = 0;
}
if (++wait_count > TX_TIMEOUT || transmit_previous_timeout) {
transmit_previous_timeout = 1;
return -1;
}
yield();
}
}
transmit_previous_timeout = 0;
len = CDC3_TX_SIZE - tx_packet->index;
if (len > size) len = size;
dest = tx_packet->buf + tx_packet->index;
tx_packet->index += len;
size -= len;
while (len-- > 0) *dest++ = *src++;
if (tx_packet->index >= CDC3_TX_SIZE) {
tx_packet->len = CDC3_TX_SIZE;
usb_tx(CDC3_TX_ENDPOINT, tx_packet);
tx_packet = NULL;
}
usb_cdc3_transmit_flush_timer = TRANSMIT_FLUSH_TIMEOUT;
}
tx_noautoflush = 0;
return ret;
}

int usb_serial3_write_buffer_free(void)
{
uint32_t len;

tx_noautoflush = 1;
if (!tx_packet) {
if (!usb_configuration ||
usb_tx_packet_count(CDC3_TX_ENDPOINT) >= TX_PACKET_LIMIT ||
(tx_packet = usb_malloc()) == NULL) {
tx_noautoflush = 0;
return 0;
}
}
len = CDC3_TX_SIZE - tx_packet->index;
// TODO: Perhaps we need "usb_cdc_transmit_flush_timer = TRANSMIT_FLUSH_TIMEOUT"
// added here, so the SOF interrupt can't take away the available buffer
// space we just promised the user could write without blocking?
// But does this come with other performance downsides? Could it lead to
// buffer data never actually transmitting in some usage cases? More
// investigation is needed.
// https://github.com/PaulStoffregen/cores/issues/10#issuecomment-61514955
tx_noautoflush = 0;
return len;
}

void usb_serial3_flush_output(void)
{
if (!usb_configuration) return;
tx_noautoflush = 1;
if (tx_packet) {
usb_cdc3_transmit_flush_timer = 0;
tx_packet->len = tx_packet->index;
usb_tx(CDC3_TX_ENDPOINT, tx_packet);
tx_packet = NULL;
} else {
usb_packet_t *tx = usb_malloc();
if (tx) {
usb_cdc3_transmit_flush_timer = 0;
usb_tx(CDC3_TX_ENDPOINT, tx);
} else {
usb_cdc3_transmit_flush_timer = 1;
}
}
tx_noautoflush = 0;
}

void usb_serial3_flush_callback(void)
{
if (tx_noautoflush) return;
if (tx_packet) {
tx_packet->len = tx_packet->index;
usb_tx(CDC3_TX_ENDPOINT, tx_packet);
tx_packet = NULL;
} else {
usb_packet_t *tx = usb_malloc();
if (tx) {
usb_tx(CDC3_TX_ENDPOINT, tx);
} else {
usb_cdc3_transmit_flush_timer = 1;
}
}
}




#endif // F_CPU
#endif // CDC3_STATUS_INTERFACE && CDC3_DATA_INTERFACE

+ 99
- 8
teensy3/usb_serial2.h 查看文件

#include "usb_desc.h" #include "usb_desc.h"


#if defined(CDC2_STATUS_INTERFACE) && defined(CDC2_DATA_INTERFACE) #if defined(CDC2_STATUS_INTERFACE) && defined(CDC2_DATA_INTERFACE)
#define USB_SERIAL_SUFFIX 2
#define SERIAL_CLASS_SUFFIX A


#include "usb_serial_template.h"
#include <inttypes.h>


#define usb_cdc2_line_coding usb_serial2_instance.cdc_line_coding
#define usb_cdc2_line_rtsdtr_millis usb_serial2_instance.cdc_line_rtsdtr_millis
#define usb_cdc2_line_rtsdtr usb_serial2_instance.cdc_line_rtsdtr
#define usb_cdc2_transmit_flush_timer usb_serial2_instance.cdc_transmit_flush_timer
#endif // CDC_STATUS_INTERFACE && CDC_DATA_INTERFACE
#if F_CPU >= 20000000

#include "core_pins.h" // for millis()

// C language implementation
#ifdef __cplusplus
extern "C" {
#endif
int usb_serial2_getchar(void);
int usb_serial2_peekchar(void);
int usb_serial2_available(void);
int usb_serial2_read(void *buffer, uint32_t size);
void usb_serial2_flush_input(void);
int usb_serial2_putchar(uint8_t c);
int usb_serial2_write(const void *buffer, uint32_t size);
int usb_serial2_write_buffer_free(void);
void usb_serial2_flush_output(void);
void usb_serial2_flush_callback(void);
extern uint32_t usb_cdc2_line_coding[2];
extern volatile uint32_t usb_cdc2_line_rtsdtr_millis;
extern volatile uint32_t systick_millis_count;
extern volatile uint8_t usb_cdc2_line_rtsdtr;
extern volatile uint8_t usb_cdc2_transmit_flush_timer;
extern volatile uint8_t usb_configuration;
#ifdef __cplusplus
}
#endif

#ifndef USB_SERIAL_DTR
#define USB_SERIAL_DTR 0x01
#endif
#ifndef USB_SERIAL_RTS
#define USB_SERIAL_RTS 0x02
#endif

// C++ interface
#ifdef __cplusplus
#include "Stream.h"
class usb_serial2_class : public Stream
{
public:
constexpr usb_serial2_class() {}
void begin(long) {
//uint32_t millis_begin = systick_millis_count;
//disabled for now - causes more trouble than it solves?
//while (!(*this)) {
// wait up to 2.5 seconds for Arduino Serial Monitor
// Yes, this is a long time, but some Windows systems open
// the port very slowly. This wait allows programs for
// Arduino Uno to "just work" (without forcing a reboot when
// the port is opened), and when no PC is connected the user's
// sketch still gets to run normally after this wait time.
//if ((uint32_t)(systick_millis_count - millis_begin) > 2500) break;
//}
}
void end() { /* TODO: flush output and shut down USB port */ };
virtual int available() { return usb_serial2_available(); }
virtual int read() { return usb_serial2_getchar(); }
virtual int peek() { return usb_serial2_peekchar(); }
virtual void flush() { usb_serial2_flush_output(); } // TODO: actually wait for data to leave USB...
virtual void clear(void) { usb_serial2_flush_input(); }
virtual size_t write(uint8_t c) { return usb_serial2_putchar(c); }
virtual size_t write(const uint8_t *buffer, size_t size) { return usb_serial2_write(buffer, size); }
size_t write(unsigned long n) { return write((uint8_t)n); }
size_t write(long n) { return write((uint8_t)n); }
size_t write(unsigned int n) { return write((uint8_t)n); }
size_t write(int n) { return write((uint8_t)n); }
virtual int availableForWrite() { return usb_serial2_write_buffer_free(); }
using Print::write;
void send_now(void) { usb_serial2_flush_output(); }
uint32_t baud(void) { return usb_cdc2_line_coding[0]; }
uint8_t stopbits(void) { uint8_t b = usb_cdc2_line_coding[1]; if (!b) b = 1; return b; }
uint8_t paritytype(void) { return usb_cdc2_line_coding[1] >> 8; } // 0=none, 1=odd, 2=even
uint8_t numbits(void) { return usb_cdc2_line_coding[1] >> 16; }
uint8_t dtr(void) { return (usb_cdc2_line_rtsdtr & USB_SERIAL_DTR) ? 1 : 0; }
uint8_t rts(void) { return (usb_cdc2_line_rtsdtr & USB_SERIAL_RTS) ? 1 : 0; }
operator bool() { return usb_configuration && (usb_cdc2_line_rtsdtr & USB_SERIAL_DTR) &&
((uint32_t)(systick_millis_count - usb_cdc2_line_rtsdtr_millis) >= 15);
}
size_t readBytes(char *buffer, size_t length) {
size_t count=0;
unsigned long startMillis = millis();
do {
count += usb_serial2_read(buffer + count, length - count);
if (count >= length) return count;
} while(millis() - startMillis < _timeout);
setReadError();
return count;
}

};
extern usb_serial2_class SerialA;
extern void serialEventA(void);
#endif // __cplusplus

#endif // F_CPU

#endif // CDC2_STATUS_INTERFACE && CDC2_DATA_INTERFACE


#endif // USBserial2_h_ #endif // USBserial2_h_

+ 269
- 9
teensy3/usb_serial3.c 查看文件

*/ */


#include "usb_dev.h" #include "usb_dev.h"
#include "usb_serial2.h"
#include "core_pins.h" // for yield()
//#include "HardwareSerial.h"
#include <string.h> // for memcpy()


// defined by usb_dev.h -> usb_desc.h // defined by usb_dev.h -> usb_desc.h
#if defined(CDC3_STATUS_INTERFACE) && defined(CDC3_DATA_INTERFACE)

#if defined(CDC2_STATUS_INTERFACE) && defined(CDC2_DATA_INTERFACE)
#if F_CPU >= 20000000 #if F_CPU >= 20000000
#include "usb_serial_port.h"


struct usb_serial_port usb_serial3_instance = {
.cdc_rx_endpoint = CDC3_RX_ENDPOINT,
.cdc_tx_endpoint = CDC3_TX_ENDPOINT,
.cdc_tx_size = CDC3_TX_SIZE,
};
uint32_t usb_cdc2_line_coding[2];
volatile uint32_t usb_cdc2_line_rtsdtr_millis;
volatile uint8_t usb_cdc2_line_rtsdtr=0;
volatile uint8_t usb_cdc2_transmit_flush_timer=0;

static usb_packet_t *rx_packet=NULL;
static usb_packet_t *tx_packet=NULL;
static volatile uint8_t tx_noautoflush=0;

#define TRANSMIT_FLUSH_TIMEOUT 5 /* in milliseconds */

// get the next character, or -1 if nothing received
int usb_serial2_getchar(void)
{
unsigned int i;
int c;

if (!rx_packet) {
if (!usb_configuration) return -1;
rx_packet = usb_rx(CDC2_RX_ENDPOINT);
if (!rx_packet) return -1;
}
i = rx_packet->index;
c = rx_packet->buf[i++];
if (i >= rx_packet->len) {
usb_free(rx_packet);
rx_packet = NULL;
} else {
rx_packet->index = i;
}
return c;
}

// peek at the next character, or -1 if nothing received
int usb_serial2_peekchar(void)
{
if (!rx_packet) {
if (!usb_configuration) return -1;
rx_packet = usb_rx(CDC2_RX_ENDPOINT);
if (!rx_packet) return -1;
}
if (!rx_packet) return -1;
return rx_packet->buf[rx_packet->index];
}

// number of bytes available in the receive buffer
int usb_serial2_available(void)
{
int count;
count = usb_rx_byte_count(CDC2_RX_ENDPOINT);
if (rx_packet) count += rx_packet->len - rx_packet->index;
return count;
}

// read a block of bytes to a buffer
int usb_serial2_read(void *buffer, uint32_t size)
{
uint8_t *p = (uint8_t *)buffer;
uint32_t qty, count=0;

while (size) {
if (!usb_configuration) break;
if (!rx_packet) {
rx:
rx_packet = usb_rx(CDC2_RX_ENDPOINT);
if (!rx_packet) break;
if (rx_packet->len == 0) {
usb_free(rx_packet);
goto rx;
}
}
qty = rx_packet->len - rx_packet->index;
if (qty > size) qty = size;
memcpy(p, rx_packet->buf + rx_packet->index, qty);
p += qty;
count += qty;
size -= qty;
rx_packet->index += qty;
if (rx_packet->index >= rx_packet->len) {
usb_free(rx_packet);
rx_packet = NULL;
}
}
return count;
}

// discard any buffered input
void usb_serial2_flush_input(void)
{
usb_packet_t *rx;

if (!usb_configuration) return;
if (rx_packet) {
usb_free(rx_packet);
rx_packet = NULL;
}
while (1) {
rx = usb_rx(CDC2_RX_ENDPOINT);
if (!rx) break;
usb_free(rx);
}
}

// Maximum number of transmit packets to queue so we don't starve other endpoints for memory
#define TX_PACKET_LIMIT 8

// When the PC isn't listening, how long do we wait before discarding data? If this is
// too short, we risk losing data during the stalls that are common with ordinary desktop
// software. If it's too long, we stall the user's program when no software is running.
#define TX_TIMEOUT_MSEC 70
#if F_CPU == 256000000
#define TX_TIMEOUT (TX_TIMEOUT_MSEC * 1706)
#elif F_CPU == 240000000
#define TX_TIMEOUT (TX_TIMEOUT_MSEC * 1600)
#elif F_CPU == 216000000
#define TX_TIMEOUT (TX_TIMEOUT_MSEC * 1440)
#elif F_CPU == 192000000
#define TX_TIMEOUT (TX_TIMEOUT_MSEC * 1280)
#elif F_CPU == 180000000
#define TX_TIMEOUT (TX_TIMEOUT_MSEC * 1200)
#elif F_CPU == 168000000
#define TX_TIMEOUT (TX_TIMEOUT_MSEC * 1100)
#elif F_CPU == 144000000
#define TX_TIMEOUT (TX_TIMEOUT_MSEC * 932)
#elif F_CPU == 120000000
#define TX_TIMEOUT (TX_TIMEOUT_MSEC * 764)
#elif F_CPU == 96000000
#define TX_TIMEOUT (TX_TIMEOUT_MSEC * 596)
#elif F_CPU == 72000000
#define TX_TIMEOUT (TX_TIMEOUT_MSEC * 512)
#elif F_CPU == 48000000
#define TX_TIMEOUT (TX_TIMEOUT_MSEC * 428)
#elif F_CPU == 24000000
#define TX_TIMEOUT (TX_TIMEOUT_MSEC * 262)
#endif #endif


#endif // CDC3_STATUS_INTERFACE && CDC3_DATA_INTERFACE
// When we've suffered the transmit timeout, don't wait again until the computer
// begins accepting data. If no software is running to receive, we'll just discard
// data as rapidly as Serial.print() can generate it, until there's something to
// actually receive it.
static uint8_t transmit_previous_timeout=0;


// transmit a character. 0 returned on success, -1 on error
int usb_serial2_putchar(uint8_t c)
{
return usb_serial2_write(&c, 1);
}


int usb_serial2_write(const void *buffer, uint32_t size)
{
uint32_t ret = size;
uint32_t len;
uint32_t wait_count;
const uint8_t *src = (const uint8_t *)buffer;
uint8_t *dest;

tx_noautoflush = 1;
while (size > 0) {
if (!tx_packet) {
wait_count = 0;
while (1) {
if (!usb_configuration) {
tx_noautoflush = 0;
return -1;
}
if (usb_tx_packet_count(CDC2_TX_ENDPOINT) < TX_PACKET_LIMIT) {
tx_noautoflush = 1;
tx_packet = usb_malloc();
if (tx_packet) break;
tx_noautoflush = 0;
}
if (++wait_count > TX_TIMEOUT || transmit_previous_timeout) {
transmit_previous_timeout = 1;
return -1;
}
yield();
}
}
transmit_previous_timeout = 0;
len = CDC2_TX_SIZE - tx_packet->index;
if (len > size) len = size;
dest = tx_packet->buf + tx_packet->index;
tx_packet->index += len;
size -= len;
while (len-- > 0) *dest++ = *src++;
if (tx_packet->index >= CDC2_TX_SIZE) {
tx_packet->len = CDC2_TX_SIZE;
usb_tx(CDC2_TX_ENDPOINT, tx_packet);
tx_packet = NULL;
}
usb_cdc2_transmit_flush_timer = TRANSMIT_FLUSH_TIMEOUT;
}
tx_noautoflush = 0;
return ret;
}

int usb_serial2_write_buffer_free(void)
{
uint32_t len;

tx_noautoflush = 1;
if (!tx_packet) {
if (!usb_configuration ||
usb_tx_packet_count(CDC2_TX_ENDPOINT) >= TX_PACKET_LIMIT ||
(tx_packet = usb_malloc()) == NULL) {
tx_noautoflush = 0;
return 0;
}
}
len = CDC2_TX_SIZE - tx_packet->index;
// TODO: Perhaps we need "usb_cdc_transmit_flush_timer = TRANSMIT_FLUSH_TIMEOUT"
// added here, so the SOF interrupt can't take away the available buffer
// space we just promised the user could write without blocking?
// But does this come with other performance downsides? Could it lead to
// buffer data never actually transmitting in some usage cases? More
// investigation is needed.
// https://github.com/PaulStoffregen/cores/issues/10#issuecomment-61514955
tx_noautoflush = 0;
return len;
}

void usb_serial2_flush_output(void)
{
if (!usb_configuration) return;
tx_noautoflush = 1;
if (tx_packet) {
usb_cdc2_transmit_flush_timer = 0;
tx_packet->len = tx_packet->index;
usb_tx(CDC2_TX_ENDPOINT, tx_packet);
tx_packet = NULL;
} else {
usb_packet_t *tx = usb_malloc();
if (tx) {
usb_cdc2_transmit_flush_timer = 0;
usb_tx(CDC2_TX_ENDPOINT, tx);
} else {
usb_cdc2_transmit_flush_timer = 1;
}
}
tx_noautoflush = 0;
}

void usb_serial2_flush_callback(void)
{
if (tx_noautoflush) return;
if (tx_packet) {
tx_packet->len = tx_packet->index;
usb_tx(CDC2_TX_ENDPOINT, tx_packet);
tx_packet = NULL;
} else {
usb_packet_t *tx = usb_malloc();
if (tx) {
usb_tx(CDC2_TX_ENDPOINT, tx);
} else {
usb_cdc2_transmit_flush_timer = 1;
}
}
}




#endif // F_CPU
#endif // CDC2_STATUS_INTERFACE && CDC2_DATA_INTERFACE

+ 99
- 8
teensy3/usb_serial3.h 查看文件

#include "usb_desc.h" #include "usb_desc.h"


#if defined(CDC3_STATUS_INTERFACE) && defined(CDC3_DATA_INTERFACE) #if defined(CDC3_STATUS_INTERFACE) && defined(CDC3_DATA_INTERFACE)
#define USB_SERIAL_SUFFIX 3
#define SERIAL_CLASS_SUFFIX B


#include "usb_serial_template.h"
#include <inttypes.h>


#define usb_cdc3_line_coding usb_serial3_instance.cdc_line_coding
#define usb_cdc3_line_rtsdtr_millis usb_serial3_instance.cdc_line_rtsdtr_millis
#define usb_cdc3_line_rtsdtr usb_serial3_instance.cdc_line_rtsdtr
#define usb_cdc3_transmit_flush_timer usb_serial3_instance.cdc_transmit_flush_timer
#endif // CDC_STATUS_INTERFACE && CDC_DATA_INTERFACE
#if F_CPU >= 20000000

#include "core_pins.h" // for millis()

// C language implementation
#ifdef __cplusplus
extern "C" {
#endif
int usb_serial3_getchar(void);
int usb_serial3_peekchar(void);
int usb_serial3_available(void);
int usb_serial3_read(void *buffer, uint32_t size);
void usb_serial3_flush_input(void);
int usb_serial3_putchar(uint8_t c);
int usb_serial3_write(const void *buffer, uint32_t size);
int usb_serial3_write_buffer_free(void);
void usb_serial3_flush_output(void);
void usb_serial3_flush_callback(void);
extern uint32_t usb_cdc3_line_coding[2];
extern volatile uint32_t usb_cdc3_line_rtsdtr_millis;
extern volatile uint32_t systick_millis_count;
extern volatile uint8_t usb_cdc3_line_rtsdtr;
extern volatile uint8_t usb_cdc3_transmit_flush_timer;
extern volatile uint8_t usb_configuration;
#ifdef __cplusplus
}
#endif

#ifndef USB_SERIAL_DTR
#define USB_SERIAL_DTR 0x01
#endif
#ifndef USB_SERIAL_RTS
#define USB_SERIAL_RTS 0x02
#endif

// C++ interface
#ifdef __cplusplus
#include "Stream.h"
class usb_serial3_class : public Stream
{
public:
constexpr usb_serial3_class() {}
void begin(long) {
//uint32_t millis_begin = systick_millis_count;
//disabled for now - causes more trouble than it solves?
//while (!(*this)) {
// wait up to 2.5 seconds for Arduino Serial Monitor
// Yes, this is a long time, but some Windows systems open
// the port very slowly. This wait allows programs for
// Arduino Uno to "just work" (without forcing a reboot when
// the port is opened), and when no PC is connected the user's
// sketch still gets to run normally after this wait time.
//if ((uint32_t)(systick_millis_count - millis_begin) > 2500) break;
//}
}
void end() { /* TODO: flush output and shut down USB port */ };
virtual int available() { return usb_serial3_available(); }
virtual int read() { return usb_serial3_getchar(); }
virtual int peek() { return usb_serial3_peekchar(); }
virtual void flush() { usb_serial3_flush_output(); } // TODO: actually wait for data to leave USB...
virtual void clear(void) { usb_serial3_flush_input(); }
virtual size_t write(uint8_t c) { return usb_serial3_putchar(c); }
virtual size_t write(const uint8_t *buffer, size_t size) { return usb_serial3_write(buffer, size); }
size_t write(unsigned long n) { return write((uint8_t)n); }
size_t write(long n) { return write((uint8_t)n); }
size_t write(unsigned int n) { return write((uint8_t)n); }
size_t write(int n) { return write((uint8_t)n); }
virtual int availableForWrite() { return usb_serial3_write_buffer_free(); }
using Print::write;
void send_now(void) { usb_serial3_flush_output(); }
uint32_t baud(void) { return usb_cdc3_line_coding[0]; }
uint8_t stopbits(void) { uint8_t b = usb_cdc3_line_coding[1]; if (!b) b = 1; return b; }
uint8_t paritytype(void) { return usb_cdc3_line_coding[1] >> 8; } // 0=none, 1=odd, 2=even
uint8_t numbits(void) { return usb_cdc3_line_coding[1] >> 16; }
uint8_t dtr(void) { return (usb_cdc3_line_rtsdtr & USB_SERIAL_DTR) ? 1 : 0; }
uint8_t rts(void) { return (usb_cdc3_line_rtsdtr & USB_SERIAL_RTS) ? 1 : 0; }
operator bool() { return usb_configuration && (usb_cdc3_line_rtsdtr & USB_SERIAL_DTR) &&
((uint32_t)(systick_millis_count - usb_cdc3_line_rtsdtr_millis) >= 15);
}
size_t readBytes(char *buffer, size_t length) {
size_t count=0;
unsigned long startMillis = millis();
do {
count += usb_serial3_read(buffer + count, length - count);
if (count >= length) return count;
} while(millis() - startMillis < _timeout);
setReadError();
return count;
}

};
extern usb_serial3_class SerialB;
extern void serialEventB(void);
#endif // __cplusplus

#endif // F_CPU

#endif // CDC3_STATUS_INTERFACE && CDC3_DATA_INTERFACE


#endif // USBserial3_h_ #endif // USBserial3_h_

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