Hello, all
I am one of the socketcan users. The kernel I am using is 2.6.29.1. So I can
only change the baud rate of the can bus using the ioctl() function. I find
this usage from the cantest project. If I want to set the baud rate as 1Mbps, I
should write the code as follows:
struct ifreq ifr;
int s;
.......
s = socket(PF_CAN, SOCK_RAW, CAN_RAW);
ifr.ifr_ifru.ifru_ivalue = 1000000;
ret = ioctl(s, SIOCSCANBAUDRATE, &ifr);
But I find that the actual baud rate is 666.7Kbps, which is 2/3 of 1000Kbps.
Then I try some other values. I find that all of the actual baud rate is 2/3 of
the setting value. It is very strange. I find that that is a function in the
file ./net/can/dev.c, named can_calc_bit_time. This function change the baud
rate to bit rate. So does this function correct ?
Plus, the board I am using is TWR-MPC5125 provided by freescale.
Guohu Li
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