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mbed-os
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pull/8109/head
deepikabhavnani 2018-09-14 10:26:03 -05:00
parent a30da7e61e
commit 0ef5d92d92
1 changed files with 9 additions and 10 deletions
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17
drivers/I2C.cpp
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@ -145,22 +145,20 @@ int I2C::recover(PinName sda, PinName scl)
DigitalInOut pin_sda(sda, PIN_INPUT, PullNone, 1); DigitalInOut pin_sda(sda, PIN_INPUT, PullNone, 1);
DigitalInOut pin_scl(scl, PIN_INPUT, PullNone, 1); DigitalInOut pin_scl(scl, PIN_INPUT, PullNone, 1);
// Read and verify if recovery is required
if (pin_scl == 1) {
if (pin_sda == 1) {
// Return successfuly as SDA and SCL is high
return 0;
}
} else {
// Return as SCL is low and no access to become master. // Return as SCL is low and no access to become master.
if (pin_scl == 0) {
return I2C_ERROR_BUS_BUSY; return I2C_ERROR_BUS_BUSY;
} }
// Return successfully as SDA and SCL is high
if (pin_sda == 1) {
return 0;
}
// Send clock pulses, for device to recover 9 // Send clock pulses, for device to recover 9
pin_scl.mode(PullNone); pin_scl.mode(PullNone);
pin_scl.output(); pin_scl.output();
int count = 9; for (int count = 0; count < 10; count++) {
while (count--) {
pin_scl.mode(PullNone); pin_scl.mode(PullNone);
pin_scl = 0; pin_scl = 0;
wait_us(5); wait_us(5);
@ -184,6 +182,7 @@ int I2C::recover(PinName sda, PinName scl)
// Return as SCL is low and no access to become master. // Return as SCL is low and no access to become master.
return I2C_ERROR_BUS_BUSY; return I2C_ERROR_BUS_BUSY;
} }
return 0; return 0;
} }