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I2C bus reset with info to user

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I2C slave might stil have something to send when ESP826 starts I2C, thus
keeping the bus stuck.
Happens e.g. when power failure/reset during transmission.
Thanks to work of drmpf there is a solution.
Implemented as separate method so as not to interfere with existing.
Usage:

Wire.begin();
if (Wire.status() != I2C_OK) Serial.writeln("Something wrong with I2C
bus that cannot be recovered. Perform power cycle or search for other
masters on bus.";
This commit is contained in:
Dave P
2016-05-26 12:53:48 +02:00
parent 5313c56f24
commit 099f3a4147
4 changed files with 27 additions and 0 deletions
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7
cores/esp8266/twi.h
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@ -26,12 +26,19 @@
extern "C" {
#endif
#define I2C_OK 0
#define I2C_SCL_HELD_LOW 1
#define I2C_SCL_HELD_LOW_AFTER_READ 2
#define I2C_SDA_HELD_LOW 3
#define I2C_SDA_HELD_LOW_AFTER_INIT 4
void twi_init(unsigned char sda, unsigned char scl);
void twi_stop(void);
void twi_setClock(unsigned int freq);
void twi_setClockStretchLimit(uint32_t limit);
uint8_t twi_writeTo(unsigned char address, unsigned char * buf, unsigned int len, unsigned char sendStop);
uint8_t twi_readFrom(unsigned char address, unsigned char * buf, unsigned int len, unsigned char sendStop);
uint8_t twi_status();
#ifdef __cplusplus
}