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BV I2C: improve bus error detection code

This commit is contained in:
King Kévin 2018-09-01 00:58:00 +02:00
parent 956188fdee
commit 7f7994678f
1 changed files with 41 additions and 44 deletions
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85
lib/busvoodoo_i2c.c
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@ -464,60 +464,57 @@ static void busvoodoo_i2c_command_scan(void* argument)
busvoodoo_led_blue_off(); // clear blinking
}
printf("scanning for I2C slaves\n");
int16_t i2c_slaves = 0; // number of slaves found
uint16_t i2c_slaves = 0; // number of slaves found
bool bus_error = false; // to remember bus error
bool periph_error = false; // to remember I2C peripheral error (which need peripheral reset)
// check for I2C slaves by going through the address space
printf("I2C slaves found: ");
for (uint16_t address = 0; address < (1 << busvoodoo_i2c_addressbits); address++) {
busvoodoo_led_blue_pulse(BUSVOODOO_LED_PULSE); // pulse blue LED to show transmission
switch (i2c_master_select_slave(BUSVOODOO_I2C, address, 10 == busvoodoo_i2c_addressbits, false)) { // try to select slave (includes start condition)
case I2C_MASTER_RC_NONE: // slave found
busvoodoo_led_blue_pulse(BUSVOODOO_LED_PULSE); // pulse blue LED to show we found a slave
printf((busvoodoo_i2c_addressbits > 7) ? "%+03x " : "%+02x ", address); // display address
i2c_slaves++; // increase slave count
break;
case I2C_MASTER_RC_START_STOP_IN_PROGESS: // I2C peripheral error
printf("start condition failed\n"); // show error to user
i2c_slaves = -2; // remember error
break; // stop scanning
case I2C_MASTER_RC_NOT_MASTER: // start condition failed
i2c_master_reset(BUSVOODOO_I2C); // reset the I2C peripheral since it might be stuck
printf("start condition failed\n"); // show error to user
i2c_slaves = -1; // remember error
break; // stop scanning
case I2C_MASTER_RC_NAK: // slave did not respond
break; // nothing to do
case I2C_MASTER_RC_BUS_ERROR:
printf("error detected on bus\n");
i2c_slaves = -2; // remember error
break;
default: // unexpected error
printf("error occurred\n");
i2c_slaves = -1; // remember error
break;
case I2C_MASTER_RC_NONE: // slave found
busvoodoo_led_blue_pulse(BUSVOODOO_LED_PULSE); // pulse blue LED to show we found a slave
printf((busvoodoo_i2c_addressbits > 7) ? "%+03x " : "%+02x ", address); // display address
i2c_slaves++; // increase slave count
break;
case I2C_MASTER_RC_START_STOP_IN_PROGESS: // I2C peripheral error
printf("start condition failed\n"); // show error to user
periph_error = true; // remember error
break; // stop scanning
case I2C_MASTER_RC_NOT_MASTER: // start condition failed
i2c_master_reset(BUSVOODOO_I2C); // reset the I2C peripheral since it might be stuck
printf("start condition failed\n"); // show error to user
bus_error = true; // remember error
break; // stop scanning
case I2C_MASTER_RC_NAK: // slave did not respond
break; // nothing to do
case I2C_MASTER_RC_BUS_ERROR:
printf("error detected on bus\n");
periph_error = true; // remember error
break;
default: // unexpected error
printf("error occurred\n");
bus_error = true; // remember error
break;
}
// TODO use proper flag
if (i2c_slaves < 0) { // error happened
if (bus_error) {
busvoodoo_leds_blink(0.5, 0.5); // show error on LEDs
if (-1 == i2c_slaves) { // just end communication
i2c_master_stop(BUSVOODOO_I2C); // send stop condition
} else if (-2 == i2c_slaves) { // reset peripheral
busvoodoo_i2c_command_reset(NULL);
}
i2c_master_stop(BUSVOODOO_I2C); // send stop condition
break; // stop scan
} else {
if (I2C_MASTER_RC_NONE != i2c_master_stop(BUSVOODOO_I2C)) { // stop stop condition
i2c_master_reset(BUSVOODOO_I2C); // reset the I2C peripheral since it might be stuck
printf("stop condition failed\n"); // show error to user
busvoodoo_leds_blink(0.5, 0.5); // show error on LEDs
i2c_slaves = -1; // remember error
break;
}
}
if (periph_error) {
busvoodoo_leds_blink(0.5, 0.5); // show error on LEDs
busvoodoo_i2c_command_reset(NULL);
break; // stop scan
}
if (I2C_MASTER_RC_NONE != i2c_master_stop(BUSVOODOO_I2C)) { // send stop condition
i2c_master_reset(BUSVOODOO_I2C); // reset the I2C peripheral since it might be stuck
printf("stop condition failed\n"); // show error to user
busvoodoo_leds_blink(0.5, 0.5); // show error on LEDs
break;
}
}
printf("\n");
if (i2c_slaves >= 0) {
printf("%u slave(s) found\n", i2c_slaves); // show summary
}
printf("\n%u slave(s) found\n", i2c_slaves); // show summary
}
/** I2C menu commands */