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Allow customization of transmit and receive buffer sizes for I2C 'Wire' object. #589

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Allow customization of transmit and receive buffer sizes for I2C 'Wire' object. #589

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59355fe
Renamed twi.c to twi.cpp
dac1e Jan 2, 2025
56ef4a4
Make Wire and twi buffers weak and allow to override by macro
dac1e Jan 2, 2025
cb707b8
Moved macros from twi.h to twi.cpp.
dac1e Jan 3, 2025
7d5eae1
Moved Wire api functions that do just type cast from .cpp file to .h
dac1e Jan 3, 2025
c1eaa79
Use C++ static_cast instead of C cast.
dac1e Jan 3, 2025
b9df583
Use override specifier in Wire.h
dac1e Jan 3, 2025
4962837
Deleted obsolete debug code.
dac1e Jan 4, 2025
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Moved macros from twi.h to twi.cpp. 
Placed TWI states in enum TWI_STATE : uint8_t.
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@dac1e
dac1e committed Jan 3, 2025
commit cb707b8414a31c89744fae497d99850c004522ab
12 changes: 11 additions & 1 deletion libraries/Wire/src/utility/twi.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -41,7 +41,17 @@
#include "pins_arduino.h"
#include "twi.h"

static volatile uint8_t twi_state;
constexpr uint32_t TWI_FREQ = 100000L;

enum TWI_STATE : uint8_t {
TWI_READY = 0,
TWI_MRX = 1,
TWI_MTX = 2,
TWI_SRX = 3,
TWI_STX = 4,
};

static volatile TWI_STATE twi_state;
static volatile uint8_t twi_slarw;
static volatile uint8_t twi_sendStop; // should the transaction end with a stop
static volatile uint8_t twi_inRepStart; // in the middle of a repeated start
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11 changes: 0 additions & 11 deletions libraries/Wire/src/utility/twi.h
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Expand Up @@ -27,17 +27,6 @@
#include <inttypes.h>
//#define ATMEGA8

#ifndef TWI_FREQ
#define TWI_FREQ 100000L
#endif

#define TWI_READY 0
#define TWI_MRX 1
#define TWI_MTX 2
#define TWI_SRX 3
#define TWI_STX 4


void twi_init(void);
void twi_disable(void);
void twi_setAddress(uint8_t);
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