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I2C - add functionality to change i2c clock speed #170

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I2C - add functionality to change i2c clock speed #170

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34 changes: 33 additions & 1 deletion cores/arduino/i2c.c
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Original file line number Diff line number Diff line change
Expand Up @@ -103,7 +103,7 @@ int i2c_openadapter(void)
{
int ret;

SET_PIN_MODE(24, I2C_MUX_MODE); // Rdx SOC PIN (Arduino header pin 18)
SET_PIN_MODE(24, I2C_MUX_MODE); // Rxd SOC PIN (Arduino header pin 18)
SET_PIN_MODE(25, I2C_MUX_MODE); // Txd SOC PIN (Arduino header pin 19)

SET_PIN_PULLUP(24, 1);
Expand All @@ -130,6 +130,38 @@ int i2c_openadapter(void)
return ret;
}

int i2c_openadapter_speed(int i2c_speed)
{
int ret;

SET_PIN_MODE(24, I2C_MUX_MODE); // Rxd SOC PIN (Arduino header pin 18)
SET_PIN_MODE(25, I2C_MUX_MODE); // Txd SOC PIN (Arduino header pin 19)

SET_PIN_PULLUP(24, 1);
SET_PIN_PULLUP(25, 1);

i2c_cfg_data_t i2c_cfg;
memset(&i2c_cfg, 0, sizeof(i2c_cfg_data_t));

i2c_cfg.speed = i2c_speed;
i2c_cfg.addressing_mode = I2C_7_Bit;
i2c_cfg.mode_type = I2C_MASTER;
i2c_cfg.cb_tx = ss_i2c_tx;
i2c_cfg.cb_rx = ss_i2c_rx;
i2c_cfg.cb_err = ss_i2c_err;

i2c_tx_complete = 0;
i2c_rx_complete = 0;
i2c_err_detect = 0;

ss_i2c_set_config(I2C_SENSING_0, &i2c_cfg);
ss_i2c_clock_enable(I2C_SENSING_0);
ret = wait_dev_ready(I2C_SENSING_0, false);

return ret;
}


void i2c_setslave(uint8_t addr)
{
i2c_slave = addr;
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1 change: 1 addition & 0 deletions cores/arduino/i2c.h
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Expand Up @@ -32,6 +32,7 @@ extern "C"{
#define I2C_ERROR -2

int i2c_openadapter(void);
int i2c_openadapter_speed(int);
void i2c_setslave(uint8_t addr);
int i2c_writebytes(uint8_t *bytes, uint8_t length, bool no_stop);
int i2c_readbytes(uint8_t *buf, int length, bool no_stop);
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5 changes: 5 additions & 0 deletions libraries/Wire/src/Wire.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -41,6 +41,11 @@ void TwoWire::begin(void)
init_status = i2c_openadapter();
}

void TwoWire::begin(int i2c_speed)
{
init_status = i2c_openadapter_speed(i2c_speed);
}

uint8_t TwoWire::requestFrom(uint8_t address, uint8_t quantity, uint8_t sendStop)
{
int ret;
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5 changes: 4 additions & 1 deletion libraries/Wire/src/Wire.h
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Original file line number Diff line number Diff line change
Expand Up @@ -24,12 +24,15 @@
#include "Stream.h"
#include "variant.h"

#define BUFFER_LENGTH 32
#define BUFFER_LENGTH 32
#define I2C_SPEED_SLOW 1
#define I2C_SPEED_FAST 2

class TwoWire : public Stream {
public:
TwoWire(void);
void begin();
void begin(int);
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indentation mismatch- perhaps 4 spaces were used instead of a tab?

void beginTransmission(uint8_t);
void beginTransmission(int);
uint8_t endTransmission(void);
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