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Add request, capture, flush to TWIBus

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This commit is contained in:
Scott Lahteine 2016-08-14 21:45:28 -07:00
parent 132322e4d9
commit bd928a69ec
3 changed files with 103 additions and 17 deletions
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4
Marlin/Marlin_main.cpp
View File

@ -5285,8 +5285,8 @@ inline void gcode_M121() { endstops.enable_globally(false); }
uint8_t bytes = code_seen('B') ? code_value_byte() : 1;
if (i2c.addr > 0 && bytes > 0 && bytes <= 32) {
i2c.reqbytes(bytes);
if (i2c.addr && bytes && bytes <= TWIBUS_BUFFER_SIZE) {
i2c.relay(bytes);
}
else {
SERIAL_ERROR_START;

59
Marlin/twibus.cpp
View File

@ -86,32 +86,72 @@ void TWIBus::send() {
this->reset();
}
void TWIBus::echodata(uint8_t bytes, const char prefix[], uint8_t adr) {
// static
void TWIBus::echoprefix(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:");
}
// static
void TWIBus::echodata(uint8_t bytes, const char prefix[], uint8_t adr) {
echoprefix(bytes, prefix, adr);
while (bytes-- && Wire.available()) SERIAL_CHAR(Wire.read());
SERIAL_EOL;
}
void TWIBus::reqbytes(const uint8_t bytes) {
if (!this->addr) return;
void TWIBus::echobuffer(const char prefix[], uint8_t adr) {
echoprefix(this->buffer_s, prefix, adr);
for (uint8_t i = 0; i < this->buffer_s; i++) SERIAL_CHAR(this->buffer[i]);
SERIAL_EOL;
}
bool TWIBus::request(const uint8_t bytes) {
if (!this->addr) return false;
#if ENABLED(DEBUG_TWIBUS)
debug(PSTR("reqbytes"), bytes);
debug(PSTR("request"), bytes);
#endif
// requestFrom() is a blocking function
Wire.requestFrom(this->addr, bytes);
// Wait until all bytes arrive, or timeout
// Wait for all bytes to arrive
millis_t t = millis() + this->timeout;
while (Wire.available() < bytes && PENDING(millis(), t)) { /*nada*/ }
while (Wire.available() < bytes)
if (ELAPSED(millis(), t)) {
#if ENABLED(DEBUG_TWIBUS)
SERIAL_ECHO_START;
SERIAL_ECHOLNPGM("i2c timeout");
#endif
return false;
}
// Simply echo the data to the bus
this->echodata(bytes, PSTR("i2c-reply"), this->addr);
return true;
}
void TWIBus::relay(const uint8_t bytes) {
#if ENABLED(DEBUG_TWIBUS)
debug(PSTR("relay"), bytes);
#endif
if (this->request(bytes))
echodata(bytes, PSTR("i2c-reply"), this->addr);
}
uint8_t TWIBus::capture(char *dst, const uint8_t bytes) {
this->reset();
uint8_t count = 0;
while (count < bytes && Wire.available())
dst[count++] = Wire.read();
return count;
}
// static
void TWIBus::flush() {
while (Wire.available()) Wire.read();
}
#if I2C_SLAVE_ADDRESS > 0
@ -120,7 +160,7 @@ void TWIBus::reqbytes(const uint8_t bytes) {
#if ENABLED(DEBUG_TWIBUS)
debug(PSTR("receive"), bytes);
#endif
this->echodata(bytes, PSTR("i2c-receive"), 0);
echodata(bytes, PSTR("i2c-receive"), 0);
}
void TWIBus::reply(char str[]/*=NULL*/) {
@ -142,6 +182,7 @@ void TWIBus::reqbytes(const uint8_t bytes) {
#if ENABLED(DEBUG_TWIBUS)
// static
void TWIBus::prefix(const char func[]) {
SERIAL_ECHOPGM("TWIBus::");
serialprintPGM(func);

57
Marlin/twibus.h
View File

@ -33,6 +33,8 @@
typedef void (*twiReceiveFunc_t)(int bytes);
typedef void (*twiRequestFunc_t)();
#define TWIBUS_BUFFER_SIZE 32
/**
* TWIBUS class
*
@ -70,7 +72,7 @@ class TWIBus {
* @brief Internal buffer
* @details A fixed buffer. TWI commands can be no longer than this.
*/
char buffer[32];
char buffer[TWIBUS_BUFFER_SIZE];
public:
@ -134,6 +136,14 @@ class TWIBus {
*/
void address(const uint8_t adr);
/**
* @brief Prefix for echo to serial
* @details Echo a label, length, address, and "data:"
*
* @param bytes the number of bytes to request
*/
static void echoprefix(uint8_t bytes, const char prefix[], uint8_t adr);
/**
* @brief Echo data on the bus to serial
* @details Echo some number of bytes from the bus
@ -144,14 +154,48 @@ class TWIBus {
static void echodata(uint8_t bytes, const char prefix[], uint8_t adr);
/**
* @brief Request data from the slave device
* @details Request a number of bytes from a slave device.
* This implementation simply sends the data to serial
* in a parser-friendly format.
* @brief Echo data in the buffer to serial
* @details Echo the entire buffer to serial
* to serial in a parser-friendly format.
*
* @param bytes the number of bytes to request
*/
void reqbytes(const uint8_t bytes);
void echobuffer(const char prefix[], uint8_t adr);
/**
* @brief Request data from the slave device and wait.
* @details Request a number of bytes from a slave device.
* Wait for the data to arrive until the timeout
* interval expires. Return true on success.
*
* @param bytes the number of bytes to request
* @return status of the request: true=success, false=timeout
*/
bool request(const uint8_t bytes);
/**
* @brief Capture data from the bus into the buffer.
* @details Capture data after a request has succeeded.
*
* @param bytes the number of bytes to request
* @return the number of bytes captured to the buffer
*/
uint8_t capture(char *dst, const uint8_t bytes);
/**
* @brief Flush the i2c bus.
* @details Get all bytes on the bus and throw them away.
*/
static void flush();
/**
* @brief Request data from the slave device, echo to serial.
* @details Request a number of bytes from a slave device and output
* the returned data to serial in a parser-friendly format.
*
* @param bytes the number of bytes to request
*/
void relay(const uint8_t bytes);
#if I2C_SLAVE_ADDRESS > 0
@ -181,6 +225,7 @@ class TWIBus {
/**
* @brief Send a reply to the bus
* @details Send the buffer and clear it.
* If a string is passed, write it into the buffer first.
*/
void reply(char str[]=NULL);
inline void reply(const char str[]) { this->reply((char*)str); }