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Update core_esp8266_si2c.c (#4070)

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* Update core_esp8266_si2c.c

Add 'clockCount' decrement, while-loop, twi_status()

* Update core_esp8266_si2c.c

Indents in changed function, removed superflous else
This commit is contained in:
mrwgx3 2018-03-24 11:49:27 -06:00 committed by Develo
parent 2d39bcba7d
commit 438d3f1d11
1 changed files with 14 additions and 8 deletions
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22
cores/esp8266/core_esp8266_si2c.c
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@ -198,17 +198,23 @@ unsigned char twi_readFrom(unsigned char address, unsigned char* buf, unsigned i
return 0;
}
uint8_t twi_status(){
if (SCL_READ()==0) return I2C_SCL_HELD_LOW; //SCL held low by another device, no procedure available to recover
uint8_t twi_status() {
if (SCL_READ()==0)
return I2C_SCL_HELD_LOW; //SCL held low by another device, no procedure available to recover
int clockCount = 20;
while (SDA_READ()==0 && clockCount>0){ //if SDA low, read the bits slaves have to sent to a max
while (SDA_READ()==0 && clockCount>0) { //if SDA low, read the bits slaves have to sent to a max
--clockCount;
twi_read_bit();
if (SCL_READ()==0) return I2C_SCL_HELD_LOW_AFTER_READ; //I2C bus error. SCL held low beyond slave clock stretch time
if (SCL_READ()==0)
return I2C_SCL_HELD_LOW_AFTER_READ; //I2C bus error. SCL held low beyond slave clock stretch time
}
if (SDA_READ()==0) return I2C_SDA_HELD_LOW; //I2C bus error. SDA line held low by slave/another_master after n bits.
if (SDA_READ()==0)
return I2C_SDA_HELD_LOW; //I2C bus error. SDA line held low by slave/another_master after n bits.
if(!twi_write_start()) return I2C_SDA_HELD_LOW_AFTER_INIT; //line busy. SDA again held low by another device. 2nd master?
else return I2C_OK; //all ok
}
if(!twi_write_start())
return I2C_SDA_HELD_LOW_AFTER_INIT; //line busy. SDA again held low by another device. 2nd master?
return I2C_OK; //all ok
}