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Add missing decrement operator to I2C clockCount (#5292)

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Develo 2018-10-29 16:30:21 -03:00 committed by GitHub
parent 8785143bff
commit 8ae0746e4a
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1 changed files with 9 additions and 10 deletions
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19
cores/esp8266/core_esp8266_si2c.c
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@ -293,24 +293,23 @@ unsigned char twi_readFrom(unsigned char address, unsigned char* buf, unsigned i
}
uint8_t twi_status() {
if (SCL_READ()==0) {
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
twi_read_bit();
if (SCL_READ()==0) {
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) {
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()) {
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;
}
return I2C_OK;
}
uint8_t twi_transmit(const uint8_t* data, uint8_t length)