Further refinements of TWIBus

This commit is contained in:
Scott Lahteine 2016-08-13 18:06:10 -07:00
parent 38fa1b1939
commit 97e0aed304
3 changed files with 128 additions and 59 deletions

View file

@ -842,12 +842,7 @@ void servo_init() {
} }
void i2c_on_request() { // just send dummy data for now void i2c_on_request() { // just send dummy data for now
static const char *msg = "Hello World!\n"; i2c.reply("Hello World!\n");
const char *adr = msg;
char c;
i2c.reset();
while (c = *adr++) i2c.addbyte(c);
i2c.send();
} }
#endif #endif

View file

@ -42,38 +42,60 @@ void TWIBus::reset() {
this->buffer[0] = 0x00; this->buffer[0] = 0x00;
} }
void TWIBus::address(const uint8_t addr) { void TWIBus::address(const uint8_t adr) {
this->addr = addr; this->addr = adr;
#if ENABLED(DEBUG_TWIBUS) #if ENABLED(DEBUG_TWIBUS)
debug(PSTR("address"), this->addr); debug(PSTR("address"), adr);
#endif #endif
} }
void TWIBus::addbyte(const char c) { void TWIBus::addbyte(const char c) {
if (buffer_s >= sizeof(this->buffer)) return; if (this->buffer_s >= COUNT(this->buffer)) return;
this->buffer[this->buffer_s++] = c; this->buffer[this->buffer_s++] = c;
#if ENABLED(DEBUG_TWIBUS) #if ENABLED(DEBUG_TWIBUS)
debug(PSTR("addbyte"), this->buffer[this->buffer_s - 1]); debug(PSTR("addbyte"), c);
#endif #endif
} }
void TWIBus::addbytes(char src[], uint8_t bytes) {
#if ENABLED(DEBUG_TWIBUS)
debug(PSTR("addbytes"), bytes);
#endif
while (bytes--) this->addbyte(*src++);
}
void TWIBus::addstring(char str[]) {
#if ENABLED(DEBUG_TWIBUS)
debug(PSTR("addstring"), str);
#endif
while (char c = *str++) this->addbyte(c);
}
void TWIBus::send() { void TWIBus::send() {
if (!this->addr) return; if (!this->addr) return;
#if ENABLED(DEBUG_TWIBUS) #if ENABLED(DEBUG_TWIBUS)
debug(PSTR("send()")); debug(PSTR("send"), this->addr);
#endif #endif
Wire.beginTransmission(this->addr); Wire.beginTransmission(this->addr);
Wire.write(this->buffer, this->buffer_s); Wire.write(this->buffer, this->buffer_s);
Wire.endTransmission(); Wire.endTransmission();
// Reset the buffer after sending the data
this->reset(); this->reset();
} }
void TWIBus::echodata(uint8_t bytes, const char prefix[], uint8_t adr) {
SERIAL_ECHO_START;
serialprintPGM(prefix);
SERIAL_ECHOPAIR(": from:", adr);
SERIAL_ECHOPAIR(" bytes:", bytes);
SERIAL_ECHOPGM (" data:");
while (bytes-- && Wire.available()) SERIAL_CHAR(Wire.read());
SERIAL_EOL;
}
void TWIBus::reqbytes(const uint8_t bytes) { void TWIBus::reqbytes(const uint8_t bytes) {
if (!this->addr) return; if (!this->addr) return;
@ -82,34 +104,57 @@ void TWIBus::reqbytes(const uint8_t bytes) {
#endif #endif
// requestFrom() is a blocking function // requestFrom() is a blocking function
millis_t t = millis() + this->timeout;
Wire.requestFrom(this->addr, bytes); Wire.requestFrom(this->addr, bytes);
// Wait until all bytes arrive, or timeout
millis_t t = millis() + this->timeout;
while (Wire.available() < bytes && PENDING(millis(), t)) { /*nada*/ } while (Wire.available() < bytes && PENDING(millis(), t)) { /*nada*/ }
this->relaydata(bytes); // Simply echo the data to the bus
this->echodata(bytes, PSTR("i2c-reply"), this->addr);
}
// Reset the buffer after sending the data #if I2C_SLAVE_ADDRESS > 0
void TWIBus::receive(uint8_t bytes) {
#if ENABLED(DEBUG_TWIBUS)
debug(PSTR("receive"), bytes);
#endif
this->echodata(bytes, PSTR("i2c-receive"), 0);
}
void TWIBus::reply(char str[]/*=NULL*/) {
#if ENABLED(DEBUG_TWIBUS)
debug(PSTR("reply"), str);
#endif
if (str) {
this->reset(); this->reset();
} this->addstring(str);
}
void TWIBus::relaydata(uint8_t bytes) { Wire.write(this->buffer, this->buffer_s);
SERIAL_ECHO_START;
SERIAL_ECHOPAIR("i2c-reply: from:", this->addr); this->reset();
SERIAL_ECHOPAIR(" bytes:", bytes); }
SERIAL_ECHOPGM (" data:");
while (bytes-- && Wire.available()) SERIAL_CHAR(Wire.read()); #endif
SERIAL_EOL;
}
#if ENABLED(DEBUG_TWIBUS) #if ENABLED(DEBUG_TWIBUS)
void TWIBus::debug(const char func[], int32_t val/*=-1*/) { void TWIBus::prefix(const char func[]) {
if (DEBUGGING(INFO)) {
SERIAL_ECHOPGM("TWIBus::"); SERIAL_ECHOPGM("TWIBus::");
serialprintPGM(func); serialprintPGM(func);
if (val >= 0) SERIAL_ECHOPAIR(": ", val); SERIAL_ECHOPGM(": ");
SERIAL_EOL;
} }
void TWIBus::debug(const char func[], uint32_t adr) {
if (DEBUGGING(INFO)) { prefix(func); SERIAL_ECHOLN(adr); }
}
void TWIBus::debug(const char func[], char c) {
if (DEBUGGING(INFO)) { prefix(func); SERIAL_ECHOLN(c); }
}
void TWIBus::debug(const char func[], char str[]) {
if (DEBUGGING(INFO)) { prefix(func); SERIAL_ECHOLN(str); }
} }
#endif #endif

View file

@ -62,7 +62,7 @@ class TWIBus {
/** /**
* @brief Number of bytes on buffer * @brief Number of bytes on buffer
* @description Number of bytes in the buffer waiting to be flushed to the bus. * @description Number of bytes in the buffer waiting to be flushed to the bus
*/ */
uint8_t buffer_s = 0; uint8_t buffer_s = 0;
@ -94,7 +94,7 @@ class TWIBus {
/** /**
* @brief Send the buffer data to the bus * @brief Send the buffer data to the bus
* @details Flush the buffer to the bus at the target address. * @details Flush the buffer to the target address
*/ */
void send(); void send();
@ -108,12 +108,40 @@ class TWIBus {
void addbyte(const char c); void addbyte(const char c);
/** /**
* @brief Set the target slave address * @brief Add some bytes to the buffer
* @details The target slave address for sending the full packet. * @details Add bytes to the end of the buffer.
* Concatenates at the buffer size.
* *
* @param addr 7-bit integer address * @param src source data address
* @param bytes the number of bytes to add
*/ */
void address(const uint8_t addr); void addbytes(char src[], uint8_t bytes);
/**
* @brief Add a null-terminated string to the buffer
* @details Add bytes to the end of the buffer up to a nul.
* Concatenates at the buffer size.
*
* @param str source string address
*/
void addstring(char str[]);
/**
* @brief Set the target slave address
* @details The target slave address for sending the full packet
*
* @param adr 7-bit integer address
*/
void address(const uint8_t adr);
/**
* @brief Echo data on the bus to serial
* @details Echo some number of bytes from the bus
* to serial in a parser-friendly format.
*
* @param bytes the number of bytes to request
*/
static void echodata(uint8_t bytes, const char prefix[], uint8_t adr);
/** /**
* @brief Request data from the slave device * @brief Request data from the slave device
@ -125,27 +153,11 @@ class TWIBus {
*/ */
void reqbytes(const uint8_t bytes); void reqbytes(const uint8_t bytes);
/**
* @brief Relay data from the slave device to serial
* @details Relay a number of bytes from the bus to
* serial in a parser-friendly format.
*
* @param bytes the number of bytes to request
*/
void relaydata(uint8_t bytes);
#if I2C_SLAVE_ADDRESS > 0 #if I2C_SLAVE_ADDRESS > 0
/**
* @brief Receive bytes (passively)
* @details Receive bytes sent to our slave address.
* and simply echo them to serial.
*/
inline void receive(uint8_t bytes) { relaydata(bytes); }
/** /**
* @brief Register a slave receive handler * @brief Register a slave receive handler
* @details Set a handler to receive data addressed to us. * @details Set a handler to receive data addressed to us
* *
* @param handler A function to handle receiving bytes * @param handler A function to handle receiving bytes
*/ */
@ -153,12 +165,25 @@ class TWIBus {
/** /**
* @brief Register a slave request handler * @brief Register a slave request handler
* @details Set a handler to send data requested from us. * @details Set a handler to send data requested from us
* *
* @param handler A function to handle receiving bytes * @param handler A function to handle receiving bytes
*/ */
inline void onRequest(const twiRequestFunc_t handler) { Wire.onRequest(handler); } inline void onRequest(const twiRequestFunc_t handler) { Wire.onRequest(handler); }
/**
* @brief Default handler to receive
* @details Receive bytes sent to our slave address
* and simply echo them to serial.
*/
void receive(uint8_t bytes);
/**
* @brief Send a reply to the bus
* @details Send the buffer and clear it.
*/
void reply(char str[]=NULL);
#endif #endif
#if ENABLED(DEBUG_TWIBUS) #if ENABLED(DEBUG_TWIBUS)
@ -167,7 +192,11 @@ class TWIBus {
* @brief Prints a debug message * @brief Prints a debug message
* @details Prints a simple debug message "TWIBus::function: value" * @details Prints a simple debug message "TWIBus::function: value"
*/ */
static void debug(const char func[], int32_t val = -1); static void prefix(const char func[]);
static void debug(const char func[], uint32_t adr);
static void debug(const char func[], char c);
static void debug(const char func[], char adr[]);
static inline void debug(const char func[], uint8_t v) { debug(func, (uint32_t)v); }
#endif #endif
}; };