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Add access methods to get the Wire bus number and I2C bus handle #11570

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Merged
merged 3 commits into from
Jul 8, 2025
+19 −1
Merged

Add access methods to get the Wire bus number and I2C bus handle #11570

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9eb66f3
feat(i2c): Add method to access the I2C bus handle
me-no-dev Jul 8, 2025
1a240e4
feat(wire): Add access method to get the I2C bus number
me-no-dev Jul 8, 2025
6300908
ci(pre-commit): Apply automatic fixes
pre-commit-ci-lite[bot] Jul 8, 2025
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7 changes: 7 additions & 0 deletions cores/esp32/esp32-hal-i2c-ng.c
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Original file line number Diff line number Diff line change
Expand Up @@ -56,6 +56,13 @@ static bool i2cDetachBus(void *bus_i2c_num) {
return true;
}

void * i2cBusHandle(uint8_t i2c_num) {
if (i2c_num >= SOC_I2C_NUM) {
return NULL;
}
return bus[i2c_num].bus_handle;
}

bool i2cIsInit(uint8_t i2c_num) {
if (i2c_num >= SOC_I2C_NUM) {
return false;
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5 changes: 5 additions & 0 deletions cores/esp32/esp32-hal-i2c.h
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Expand Up @@ -19,6 +19,7 @@

#include "soc/soc_caps.h"
#if SOC_I2C_SUPPORTED
#include "esp_idf_version.h"

#ifdef __cplusplus
extern "C" {
Expand All @@ -39,6 +40,10 @@ esp_err_t i2cWriteReadNonStop(
);
bool i2cIsInit(uint8_t i2c_num);

#if ESP_IDF_VERSION >= ESP_IDF_VERSION_VAL(5, 4, 0)
void * i2cBusHandle(uint8_t i2c_num);
#endif

#ifdef __cplusplus
}
#endif
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6 changes: 5 additions & 1 deletion libraries/Wire/src/Wire.cpp
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Expand Up @@ -39,7 +39,7 @@ extern "C" {
#include "Arduino.h"

TwoWire::TwoWire(uint8_t bus_num)
: num(bus_num & 1), sda(-1), scl(-1), bufferSize(I2C_BUFFER_LENGTH) // default Wire Buffer Size
: num(bus_num), sda(-1), scl(-1), bufferSize(I2C_BUFFER_LENGTH) // default Wire Buffer Size
,
rxBuffer(NULL), rxIndex(0), rxLength(0), txBuffer(NULL), txLength(0), txAddress(0), _timeOutMillis(50), nonStop(false)
#if !CONFIG_DISABLE_HAL_LOCKS
Expand All @@ -62,6 +62,10 @@ TwoWire::~TwoWire() {
#endif
}

uint8_t TwoWire::getBusNum() {
return num;
}

bool TwoWire::initPins(int sdaPin, int sclPin) {
if (sdaPin < 0) { // default param passed
if (num == 0) {
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2 changes: 2 additions & 0 deletions libraries/Wire/src/Wire.h
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Expand Up @@ -105,6 +105,8 @@ class TwoWire : public HardwareI2C {

bool end() override;

uint8_t getBusNum();

bool setClock(uint32_t freq) override;

void beginTransmission(uint8_t address) override;
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