updated to latest adafruit version

Author: ekettenburg

digistump-avr/libraries/TinyWireM/README.md

@@ -0,0 +1,8 @@
+TinyWireM
+=========
+
+ATtiny (e.g. Adafruit Trinket, Gemma) I2C library, adapted from BroHogan's code on Arduino Playground: http://playground.arduino.cc/Code/USIi2c
+
+Minor changes for consistency with the Arduino 1.0 Wire library (e.g. uses write() instead of send()). Buffer size slightly increased for Adafruit_LEDBackpack use.
+
+On the Trinket boards, pin #0 is SDA (I2C data), pin #2 is SCK (I2C clock).

digistump-avr/libraries/TinyWireM/TinyWireM.cpp

@@ -37,6 +37,9 @@ USI_TWI::USI_TWI(){
 
 // Public Methods //////////////////////////////////////////////////////////////
 
+//int USI_TWI::peek(){}
+//void USI_TWI::flush(){}
+
 void USI_TWI::begin(){ // initialize I2C lib
   USI_TWI_Master_Initialise();          
 }
@@ -46,18 +49,32 @@ void USI_TWI::beginTransmission(uint8_t slaveAddr){ // setup address & write bit
   USI_Buf[USI_BufIdx] = (slaveAddr<<TWI_ADR_BITS) | USI_SEND; 
 }
 
-void USI_TWI::send(uint8_t data){ // buffers up data to send
-  if (USI_BufIdx >= USI_BUF_SIZE) return;         // dont blow out the buffer
+size_t USI_TWI::write(uint8_t data){ // buffers up data to send
+  if (USI_BufIdx >= USI_BUF_SIZE) return 0;       // dont blow out the buffer
   USI_BufIdx++;                                   // inc for next byte in buffer
   USI_Buf[USI_BufIdx] = data;
+  return 1;
+}
+
+uint8_t USI_TWI::endTransmission() {
+  endTransmission(1);
 }
 
-uint8_t USI_TWI::endTransmission(){ // actually sends the buffer
+uint8_t USI_TWI::endTransmission(uint8_t stop){ // actually sends the buffer
   bool xferOK = false;
   uint8_t errorCode = 0;
   xferOK = USI_TWI_Start_Read_Write(USI_Buf,USI_BufIdx+1); // core func that does the work
   USI_BufIdx = 0;
-  if (xferOK) return 0;
+  if (xferOK) {
+    if (stop) {
+      errorCode = USI_TWI_Master_Stop();
+      if (errorCode == 0) {
+        errorCode = USI_TWI_Get_State_Info();
+        return errorCode;
+      }
+    }
+    return 0;
+  }
   else {                                  // there was an error
     errorCode = USI_TWI_Get_State_Info(); // this function returns the error number
     return errorCode;
@@ -73,19 +90,26 @@ uint8_t USI_TWI::requestFrom(uint8_t slaveAddr, uint8_t numBytes){ // setup for
   USI_Buf[0] = (slaveAddr<<TWI_ADR_BITS) | USI_RCVE;   // setup address & Rcve bit
   xferOK = USI_TWI_Start_Read_Write(USI_Buf,numBytes); // core func that does the work
   // USI_Buf now holds the data read
-  if (xferOK) return 0;
+  if (xferOK) {
+    errorCode = USI_TWI_Master_Stop();
+    if (errorCode == 0) {
+      errorCode = USI_TWI_Get_State_Info();
+      return errorCode;
+    }
+    return 0;
+  }
   else {                                  // there was an error
     errorCode = USI_TWI_Get_State_Info(); // this function returns the error number
     return errorCode;
   }
 }
 
-uint8_t USI_TWI::receive(){ // returns the bytes received one at a time
+int USI_TWI::read(){ // returns the bytes received one at a time
   USI_LastRead++;     // inc first since first uint8_t read is in USI_Buf[1]
   return USI_Buf[USI_LastRead];
 }
 
-uint8_t USI_TWI::available(){ // the bytes available that haven't been read yet
+int USI_TWI::available(){ // the bytes available that haven't been read yet
   return USI_BytesAvail - (USI_LastRead); 
 }
 

digistump-avr/libraries/TinyWireM/TinyWireM.h

@@ -38,10 +38,12 @@
 #define TinyWireM_h
 
 #include <inttypes.h>
+#include "Arduino.h"
 #define USI_SEND         0              // indicates sending to TWI
 #define USI_RCVE         1              // indicates receiving from TWI
-#define USI_BUF_SIZE    16              // bytes in message buffer
+#define USI_BUF_SIZE    18              // bytes in message buffer
 
+//class USI_TWI : public Stream
 class USI_TWI
 {
   private:
@@ -51,14 +53,30 @@ class USI_TWI
 	static uint8_t USI_BytesAvail;      // number of bytes requested but not read
 
   public:
- 	USI_TWI();
-	void begin();
-    void beginTransmission(uint8_t);
-    void send(uint8_t);
+    USI_TWI();
+    void    begin();
+    void    beginTransmission(uint8_t);
+    size_t  write(uint8_t);
+    inline size_t write(uint8_t* d, uint8_t n) { uint16_t i; for (i = 0; i < n; i++) write(d[i]); return (size_t)n; }
+    inline size_t write(unsigned long n) { return write((uint8_t)n); }
+    inline size_t write(long n) { return write((uint8_t)n); }
+    inline size_t write(unsigned int n) { return write((uint8_t)n); }
+    inline size_t write(int n) { return write((uint8_t)n); }
+    void send(uint8_t b)               { write(b); }
+    void send(uint8_t *d, uint8_t n)   { write(d, n); }
+    void send(int n)                   { write((uint8_t)n); }
     uint8_t endTransmission();
+    uint8_t endTransmission(uint8_t);
     uint8_t requestFrom(uint8_t, uint8_t);
-    uint8_t receive(); 
-    uint8_t available(); 
+    int     read(); 
+    int     available(); 
+    int     peek(void);
+    void    flush(void);
+    uint8_t receive(void) {
+        int c = read();
+        if (c < 0) return 0;
+        return c;
+    }
 };
 
 extern USI_TWI TinyWireM;

digistump-avr/libraries/TinyWireM/USI_TWI_Master.cpp

@@ -20,20 +20,12 @@
 *			length should be these two bytes plus the number of bytes to read.
 ****************************************************************************/
 #include <avr/interrupt.h>
-#if defined (__AVR_ATtiny45__) || defined (__AVR_ATtiny85__)
-#define F_CPU 16500000UL  
-
-#elif defined (__AVR_ATtiny87__) || defined (__AVR_ATtiny167__)
-#define F_CPU 16000000UL        // Sets up the default speed for delay.h
-#endif
-
 #include <util/delay.h>
 #include <avr/io.h>
 #include "USI_TWI_Master.h"
 
 unsigned char USI_TWI_Start_Transceiver_With_Data( unsigned char * , unsigned char );
 unsigned char USI_TWI_Master_Transfer( unsigned char );
-unsigned char USI_TWI_Master_Stop( void );
 unsigned char USI_TWI_Master_Start( void );
 
 union  USI_TWI_state
@@ -254,11 +246,8 @@ unsigned char USI_TWI_Start_Transceiver_With_Data( unsigned char *msg, unsigned
       USI_TWI_Master_Transfer( tempUSISR_1bit );   // Generate ACK/NACK.
     }
   }while( --msgSize) ;                             // Until all data sent/received.
-  
-  if (!USI_TWI_Master_Stop())
-  {
-	return (FALSE);                           // Send a STOP condition on the TWI bus.
-	}
+
+  // usually a stop condition is sent here, but TinyWireM needs to choose whether or not to send it
 
 /* Transmission successfully completed*/
   return (TRUE);

digistump-avr/libraries/TinyWireM/USI_TWI_Master.h

@@ -21,14 +21,6 @@
 //********** Defines **********//
 
 // Defines controlling timing limits - SCL <= 100KHz.
-#if defined (__AVR_ATtiny45__) || defined (__AVR_ATtiny85__)
-#define SYS_CLK   16500.0  // [kHz] Default for ATtiny2313
-
-#elif defined (__AVR_ATtiny87__) || defined (__AVR_ATtiny167__)
-#define SYS_CLK   16000.0  // [kHz] Default for ATtiny2313
-#endif
-
-
 
 // For use with _delay_us()
 #define T2_TWI    5 		// >4,7us
@@ -88,6 +80,16 @@
     #define PIN_USI_SCL         PINB2
 #endif
 
+#if defined(__AVR_ATtiny84__) | defined(__AVR_ATtiny44__)
+    #  define DDR_USI           DDRA
+    #  define PORT_USI          PORTA
+    #  define PIN_USI           PINA
+    #  define PORT_USI_SDA      PORTA6
+    #  define PORT_USI_SCL      PORTA4
+    #  define PIN_USI_SDA       PINA6
+    #  define PIN_USI_SCL       PINA4
+#endif
+
 #if defined(__AVR_AT90Tiny2313__) | defined(__AVR_ATtiny2313__)
     #define DDR_USI             DDRB
     #define PORT_USI            PORTB
@@ -119,4 +121,5 @@
 void              USI_TWI_Master_Initialise( void );
 unsigned char USI_TWI_Start_Random_Read( unsigned char * , unsigned char );
 unsigned char USI_TWI_Start_Read_Write( unsigned char * , unsigned char );
+unsigned char USI_TWI_Master_Stop( void );
 unsigned char USI_TWI_Get_State_Info( void );

digistump-avr/libraries/TinyWireM/keywords.txt

@@ -14,8 +14,8 @@ begin	KEYWORD2
 beginTransmission	KEYWORD2
 endTransmission	KEYWORD2
 requestFrom	KEYWORD2
-send	KEYWORD2
-receive	KEYWORD2
+write	KEYWORD2
+read	KEYWORD2
 
 #######################################
 # Instances (KEYWORD2)

digistump-avr/libraries/TinyWireM/library.properties

@@ -0,0 +1,9 @@
+name=TinyWireM
+version=1.0.0
+author=Adafruit
+maintainer=Adafruit <[email protected]>
+sentence=I2C library for Trinket and Gemma, adapted from BroHogan's code on Arduino Playground
+paragraph=I2C library for Trinket and Gemma, adapted from BroHogan's code on Arduino Playground
+category=Signal Input/Output
+url=https://github.com/adafruit/TinyWireM
+architectures=*