IBASE SMARC Evaluation Kit - Manual (Page 68)

42 SMARC Evaluation Kit
return -1;
}
switch (size) {
case I2C_SMBUS_BYTE:
if (!(funcs & I2C_FUNC_SMBUS_READ_BYTE)) {
fprintf(stderr, MISSING_FUNC_FMT, "SMBus receive byte");
return -1;
}
if (daddress >= 0
&& !(funcs & I2C_FUNC_SMBUS_WRITE_BYTE)) {
fprintf(stderr, MISSING_FUNC_FMT, "SMBus send byte");
return -1;
}
break;
case I2C_SMBUS_BYTE_DATA:
if (!(funcs & I2C_FUNC_SMBUS_READ_BYTE_DATA)) {
fprintf(stderr, MISSING_FUNC_FMT, "SMBus read byte");
return -1;
}
break;
case I2C_SMBUS_WORD_DATA:
if (!(funcs & I2C_FUNC_SMBUS_READ_WORD_DATA)) {
fprintf(stderr, MISSING_FUNC_FMT, "SMBus read word");
return -1;
}
break;
}
if (pec
&& !(funcs & (I2C_FUNC_SMBUS_PEC | I2C_FUNC_I2C))) {
fprintf(stderr, "Warning: Adapter does "
"not seem to support PEC\n");
}
return 0;
}
static int confirm(const char *filename, int address, int size, int daddress,
int pec)
{
int dont = 0;
fprintf(stderr, "WARNING! This program can confuse your I2C "
"bus, cause data loss and worse!\n");
/* Don't let the user break his/her EEPROMs */
if (address >= 0x50 && address <= 0x57 && pec) {
fprintf(stderr, "STOP! EEPROMs are I2C devices, not "
"SMBus devices. Using PEC\non I2C devices may "
"result in unexpected results, such as\n"
"trashing the contents of EEPROMs. We can't "
"let you do that, sorry.\n");
return 0;
}
if (size == I2C_SMBUS_BYTE && daddress >= 0 && pec) {
fprintf(stderr, "WARNING! All I2C chips and some SMBus chips "
"will interpret a write\nbyte command with PEC as a"
"write byte data command, effectively writing a\n"
"value into a register!\n");
dont++;
}
fprintf(stderr, "I will read from device file %s, chip "
"address 0x%02x, ", filename, address);
if (daddress < 0)
fprintf(stderr, "current data\naddress");
else