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Further refinements of TWIBus

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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
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7
Marlin/Marlin_main.cpp
View file

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

101
Marlin/twibus.cpp
View file

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

79
Marlin/twibus.h
View file

@ -62,7 +62,7 @@ class TWIBus {
/**
* @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;
@ -94,7 +94,7 @@ class TWIBus {
/**
* @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();
@ -108,12 +108,40 @@ class TWIBus {
void addbyte(const char c);
/**
* @brief Set the target slave address
* @details The target slave address for sending the full packet.
* @brief Add some bytes to the buffer
* @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
@ -125,27 +153,11 @@ class TWIBus {
*/
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
/**
* @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
* @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
*/
@ -153,12 +165,25 @@ class TWIBus {
/**
* @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
*/
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
#if ENABLED(DEBUG_TWIBUS)
@ -167,7 +192,11 @@ class TWIBus {
* @brief Prints a debug message
* @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
};