I want to use SystemRDL to define some registers for a peripheral I2C device. I tried the following spec:
regfile eTACHS {
name = "TACH registers";
reg {
name = "Read tach";
field {
desc = "Checksum-byte 0xFF means not ready";
} CHECK[7:0] = 0;
field {
desc = "All 16bits should be 0x0000";
} ZEROS[15:8] = 0;
field {
desc = "Value with the RPM";
} TACH[24:16] = 0;
field {
desc = "Rest of the buffer is discarded";
} RESERVED[31:25] = 0;
} READ_TACH0 @ 0x0a;
reg {
name = "Read tach";
field {
desc = "Checksum-byte 0xFF means not ready";
} CHECK[7:0] = 0;
field {
desc = "All 16bits should be 0x0000";
} ZEROS[15:8] = 0;
field {
desc = "Value with the RPM";
} TACH[24:16] = 0;
field {
desc = "Rest of the buffer is discarded";
} RESERVED[31:25] = 0;
} READ_TACH1 @ 0x0b;
};
addrmap fan {
name = "FAN registers";
eTACHS TACHS;
};
The data size for each I2C command is 32 bits.
The above rdl when I tried to `dump` it, I got the following result:
peakrdl dump fan_i2c.rdl
fan_i2c.rdl:36:7: error: Instance 'READ_TACH1' at offset +0xB:0xE overlaps with 'READ_TACH0' at offset +0xA:0xD
} READ_TACH1 @ 0x0b;
^^^^^^^^^^
fatal: Elaborate aborted due to previous errors
My I2C peripheral device is a set of commands like:
READ_TACH0 = 0x0a
READ_TACH1 = 0x0b
....
The are many commands like that.
With SystemRDL, would it be possible to define a RDL for I2C slave register map ? Maybe some way to avoid overlaps errors ?
Well, I could find a RDL example for I2C specification.
Thanks
