Re: CAN implementation on A20 Allwinner

[Gerhard Bertelsmann <info@gerhard-bertelsmann.de>]

Hi Marc,

Am 2015-08-27 15:49, schrieb Marc Kleine-Budde:
> On 08/27/2015 03:34 PM, Gerhard Bertelsmann wrote:
>>> Which are the registers that have the upper 24 bit used?
>> 
>> CAN_STA_REG  status register
>> CAN_BUS_TIME bus timing
>> CAN_REC_REG  errot counter
> 
> That's ok.
> 
>> Some regs also have a different address
> 
> Which one? How may?

here a quick overview (not a complete list):

   original    address    Allwinner
SJA1000_MOD    0x00   CAN_MOD_SEL    OK
SJA1000_CMR    0x01   CAN_CMD_REG    OK
SJA1000_SR     0x02   CAN_STA_REG    OK but 24 bit (more values)
SJA1000_IR     0x03   CAN_INT_REG    OK
SJA1000_IER    0x04   CAN_INTE_REG   OK
                0x05   CAN_BUS_TIME   NOK also 24 bit
SJA1000_BTR0   0x06   CAN_TEWL       NOK CAN TX error warn limit reg
SJA1000_BTR1   0x07   CAN_ERRC       NOK CAN error counter register
SJA1000_OCR    0x08   CAN_RMCNT      NOK CAN receive message count reg

SJA1000_ALC    0x0B                  NOK
SJA1000_ECC    0x0C                  NOK
SJA1000_EWL    0x0D                  NOK
SJA1000_RXERR  0x0E                  NOK
SJA1000_TXERR  0x0F                  NOK
SJA1000_ACCC0  0x10   CAN_AC0        OK  Reset mode: CAN_ACP_CODE but 32 
bit
SJA1000_ACCC1  0x11   CAN_AM0        NOK Reset mode: CAN_ACP_CODE 32 bit
SJA1000_ACCC2  0x12   CAN_TRBUF2     NOK CAN TX/RX mbuffer 2 reg
SJA1000_ACCC3  0x13   CAN_TRBUF3     NOK CAN TX/RX mbuffer 3 reg
SJA1000_ACCM0  0x14   CAN_TRBUF4     NOK CAN TX/RX mbuffer 4 reg
SJA1000_ACCM1  0x15   CAN_TRBUF5     NOK CAN TX/RX mbuffer 5 reg
SJA1000_ACCM2  0x16   CAN_TRBUF6     NOK CAN TX/RX mbuffer 6 reg
SJA1000_ACCM3  0x17   CAN_TRBUF7     NOK CAN TX/RX mbuffer 7 reg
SJA1000_RMC    0x1D   CAN_TRBUF8     NOK CAN TX/RX mbuffer 8 reg
SJA1000_RBSA   0x1E   CAN_TRBUF9     NOK CAN TX/RX mbuffer 9 reg

more differences than similarities ... A sja1000 module with "quirks" 
makes
no sense to me.

Gerd