Wire lib change buffer size definition to BUFFER_LENGTH for better AVR compatibility

Author: rogerclarkmelbourne

STM32F1/libraries/Wire/SoftWire.h

@@ -57,7 +57,7 @@
 //#define I2C_DELAY(x) {uint32 time=micros(); while(time>(micros()+x));}
 #define I2C_DELAY(x) do{for(int i=0;i<x;i++) {asm volatile("nop");}}while(0)
 
-#define BUFFER_LENGTH 32
+
 
 
 class TwoWire : public WireBase {

STM32F1/libraries/Wire/WireBase.cpp

@@ -78,8 +78,8 @@ uint8 WireBase::endTransmission(){
 // call, allows for the Arduino style to stay while also giving the flexibility
 // to bulk send
 uint8 WireBase::requestFrom(uint8 address, int num_bytes) {
-    if (num_bytes > WIRE_BUFSIZ) {
-        num_bytes = WIRE_BUFSIZ;
+    if (num_bytes > BUFFER_LENGTH) {
+        num_bytes = BUFFER_LENGTH;
     }
     itc_msg.addr = address;
     itc_msg.flags = I2C_MSG_READ;
@@ -96,7 +96,7 @@ uint8 WireBase::requestFrom(int address, int numBytes) {
 }
 
 void WireBase::write(uint8 value) {
-    if (tx_buf_idx == WIRE_BUFSIZ) {
+    if (tx_buf_idx == BUFFER_LENGTH) {
         tx_buf_overflow = true;
         return;
     }

STM32F1/libraries/Wire/WireBase.h

@@ -44,7 +44,7 @@
 #include "wirish.h"
 #include <libmaple/i2c.h>
 
-#define WIRE_BUFSIZ 32
+#define BUFFER_LENGTH 32
 
 /* return codes from endTransmission() */
 #define SUCCESS   0        /* transmission was successful */
@@ -56,11 +56,11 @@
 class WireBase { // Abstraction is awesome!
 protected:
     i2c_msg itc_msg;
-    uint8 rx_buf[WIRE_BUFSIZ];      /* receive buffer */
+    uint8 rx_buf[BUFFER_LENGTH];      /* receive buffer */
     uint8 rx_buf_idx;               /* first unread idx in rx_buf */
     uint8 rx_buf_len;               /* number of bytes read */
 
-    uint8 tx_buf[WIRE_BUFSIZ];      /* transmit buffer */
+    uint8 tx_buf[BUFFER_LENGTH];      /* transmit buffer */
     uint8 tx_buf_idx;  // next idx available in tx_buf, -1 overflow
     boolean tx_buf_overflow;