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我希望有人向我解釋以下無法理解這行代碼，C++
我有C++代碼，包括初始化期間該行
ESPCommand<BufferedSerial> esp(D1, D0, PTC6);
其中ESPCommand是一個類， BufferedSerial是一個類，這是我第一次看到這種類型的初始化是什麼意思？這裏的類
class BufferedSerial : public RawSerial
{
private:
MyBuffer <char> _rxbuf;
MyBuffer <char> _txbuf;
uint32_t _buf_size;
uint32_t _tx_multiple;
void rxIrq(void);
void txIrq(void);
void prime(void);
public:
/** Create a BufferedSerial port, connected to the specified transmit and receive pins
* @param tx Transmit pin
* @param rx Receive pin
* @param buf_size printf() buffer size
* @param tx_multiple amount of max printf() present in the internal ring buffer at one time
* @param name optional name
* @note Either tx or rx may be specified as NC if unused
*/
BufferedSerial(PinName tx, PinName rx, uint32_t buf_size = 256, uint32_t tx_multiple = 4,const char* name=NULL);
/** Destroy a BufferedSerial port
*/
virtual ~BufferedSerial(void);
/** Check on how many bytes are in the rx buffer
* @return 1 if something exists, 0 otherwise
*/
virtual int readable(void);
/** Check to see if the tx buffer has room
* @return 1 always has room and can overwrite previous content if too small/slow
*/
virtual int writeable(void);
/** Get a single byte from the BufferedSerial Port.
* Should check readable() before calling this.
* @return A byte that came in on the Serial Port
*/
virtual int getc(void);
/** Write a single byte to the BufferedSerial Port.
* @param c The byte to write to the Serial Port
* @return The byte that was written to the Serial Port Buffer
*/
virtual int putc(int c);
/** Write a string to the BufferedSerial Port. Must be NULL terminated
* @param s The string to write to the Serial Port
* @return The number of bytes written to the Serial Port Buffer
*/
virtual int puts(const char *s);
/** Write a formatted string to the BufferedSerial Port.
* @param format The string + format specifiers to write to the Serial Port
* @return The number of bytes written to the Serial Port Buffer
*/
virtual int printf(const char* format, ...);
/** Write data to the Buffered Serial Port
* @param s A pointer to data to send
* @param length The amount of data being pointed to
* @return The number of bytes written to the Serial Port Buffer
*/
virtual ssize_t write(const void *s, std::size_t length);
};
，這是另一種
template <typename SERIAL>
class ESPCommand {
private:
SLIPPacket<SERIAL> _slip;
DigitalIn _button;
public:
ESPCommand(PinName tx, PinName rx, PinName button) :
_slip(tx, rx), _button(button){}
private:
bool command_start(char cmd, uint16_t len) {
len -= 4; // First word not included in length
return _slip.req_start() &&
_slip.putc(0x00) &&
_slip.putc(cmd) &&
_slip.send(&len, 2);
}
bool command_flush() {
uint16_t len;
return _slip.resp_start() &&
_slip.getc() == 0x01 &&
_slip.getc() >= 0 &&
_slip.recv(&len, 2) &&
_slip.recv(0, 4+len-2) &&
_slip.getc() == 0x00 &&
_slip.getc() >= 0 &&
_slip.resp_finish();
}
bool command_finish() {
return _slip.req_finish() &&
command_flush();
}
public:
bool sync() {
#ifdef LED_STATUS
led_green = 0; // Show progress
#endif
while (true) {
if (sync_frame()) {
#ifdef LED_STATUS
led_green = 1; // Show progress
#endif
return true;
}
}
}
bool sync_frame() {
// Flush serial line
_slip.flush();
printf("\r\nPower cycle ESP, put into FW Update mode, push user button\r\n");
int temp_button = _button;
while(temp_button == _button){;} // wait for button press
printf("\r\nContinuing Now\r\n");
// Send sync frame
uint32_t x = 0;
if (!(command_start(ESP_SYNC_FRAME, 2*4 + 32) &&
_slip.send(&x, 4) &&
_slip.putc(0x07) &&
_slip.putc(0x07) &&
_slip.putc(0x12) &&
_slip.putc(0x20)))
return false;
for (int i = 0; i < 32; i++) {
if (!_slip.putc(0x55))
return false;
}
if (!command_finish())
return false;
for (int i = 0; i < 7; i++) {
if (!command_flush())
return false;
}
return true;
}
bool flash_start(uint32_t blocks, uint32_t block_size, uint32_t address) {
uint32_t x = 0;
uint32_t size = blocks * block_size;
return command_start(ESP_FLASH_START, 5*4) &&
_slip.send(&x, 4) &&
_slip.send(&size, 4) &&
_slip.send(&blocks, 4) &&
_slip.send(&block_size, 4) &&
_slip.send(&address, 4) &&
command_finish();
}
bool flash_data(const char *data, uint32_t len, uint32_t n) {
uint32_t zero = 0;
uint32_t x = 0xef;
for (int i = 0; i < len; i++) {
x ^= data[i];
}
return command_start(ESP_FLASH_DATA, 5*4 + len) &&
_slip.send(&x, 4) &&
_slip.send(&len, 4) &&
_slip.send(&n, 4) &&
_slip.send(&zero, 4) &&
_slip.send(&zero, 4) &&
_slip.send(data, len) &&
command_finish();
}
bool flash_finish() {
uint32_t x = 0;
return command_start(ESP_FLASH_FINISH, 2*4) &&
_slip.send(&x, 4) &&
_slip.send(&x, 4) &&
command_finish();
}
bool flash_write(uint32_t address, const char *data, uint32_t size) {
uint32_t blocks = (size-1)/FLASH_BLOCK_SIZE + 1;
printf("Synching...\r\n");
if (!sync())
error("Sync error!");
printf("Starting transfer 0x%05x - 0x%05x\r\n", address, address + blocks*FLASH_BLOCK_SIZE);
if (!flash_start(blocks, FLASH_BLOCK_SIZE, address))
return false;
for (int i = 0; i < blocks; i++) {
printf("Flashing address 0x%05x\r\n", address + i*FLASH_BLOCK_SIZE);
if (!flash_data(&data[i*FLASH_BLOCK_SIZE], FLASH_BLOCK_SIZE, i))
return false;
}
printf("Finishing transfer\r\n");
if (!flash_finish())
return false;
wait_ms(250);
return true;
}
};
模板類？請查找。 –
@πάνταῥεῖA *類模板*，即用於製作類的模板。 – juanchopanza