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Wire buffer length improvments. (#8398)

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* Enable I2C_BUFFER_LENGTH definition for Wire lib

Based on
375a89ed58

We should have been very careful when #defining things to not use a name
that could conflict with the user's own code, so this marks that old
define as deprecated.

If you opt-into the new behavior, you do not get the old BUFFER_LENGTH
constant.

As a bonus, changing these uint8_ts to size_t both reduces the code
size & improves performance.

* Increase buffer indexing variable size

I looked over the users of these variables and they should be fine with
no additional changes. The existing methods already have an option to
use size_t rather than uint8_t.

There's a few methods which return int instead of size_t, which isn't
great from a portability perspective but will be fine since this only is
designed to run on the ESP8266.
This commit is contained in:
Flaviu Tamas
2021-12-14 11:45:57 -05:00
committed by GitHub
parent 55ef3e7397
commit 42aa0e6d25
2 changed files with 15 additions and 16 deletions
Download Patch File Download Diff File Expand all files Collapse all files

18
libraries/Wire/Wire.cpp
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@ -40,14 +40,14 @@ extern "C" {
// Initialize Class Variables //////////////////////////////////////////////////
uint8_t TwoWire::rxBuffer[BUFFER_LENGTH];
uint8_t TwoWire::rxBufferIndex = 0;
uint8_t TwoWire::rxBufferLength = 0;
uint8_t TwoWire::rxBuffer[I2C_BUFFER_LENGTH];
size_t TwoWire::rxBufferIndex = 0;
size_t TwoWire::rxBufferLength = 0;
uint8_t TwoWire::txAddress = 0;
uint8_t TwoWire::txBuffer[BUFFER_LENGTH];
uint8_t TwoWire::txBufferIndex = 0;
uint8_t TwoWire::txBufferLength = 0;
uint8_t TwoWire::txBuffer[I2C_BUFFER_LENGTH];
size_t TwoWire::txBufferIndex = 0;
size_t TwoWire::txBufferLength = 0;
uint8_t TwoWire::transmitting = 0;
void (*TwoWire::user_onRequest)(void);
@ -122,9 +122,9 @@ void TwoWire::setClockStretchLimit(uint32_t limit)
size_t TwoWire::requestFrom(uint8_t address, size_t size, bool sendStop)
{
if (size > BUFFER_LENGTH)
if (size > I2C_BUFFER_LENGTH)
{
size = BUFFER_LENGTH;
size = I2C_BUFFER_LENGTH;
}
size_t read = (twi_readFrom(address, rxBuffer, size, sendStop) == 0) ? size : 0;
rxBufferIndex = 0;
@ -183,7 +183,7 @@ size_t TwoWire::write(uint8_t data)
{
if (transmitting)
{
if (txBufferLength >= BUFFER_LENGTH)
if (txBufferLength >= I2C_BUFFER_LENGTH)
{
setWriteError();
return 0;