typedef __u64 u64;
typedef __u32 u32;
+struct calc_ref_clk {
+ __u32 clk; /* CAN system clock frequency in Hz */
+ char *name;
+};
+
struct calc_bittiming_const {
struct can_bittiming_const bittiming_const;
- __u32 ref_clk; /* CAN system clock frequency in Hz */
+ const struct calc_ref_clk ref_clk[16];
void (*printf_btr)(struct can_bittiming *bt, bool hdr);
};
.brp_max = 64,
.brp_inc = 1,
},
- .ref_clk = 8000000,
- .printf_btr = printf_btr_sja1000,
- }, {
- .bittiming_const = {
- .name = "mscan",
- .tseg1_min = 4,
- .tseg1_max = 16,
- .tseg2_min = 2,
- .tseg2_max = 8,
- .sjw_max = 4,
- .brp_min = 1,
- .brp_max = 64,
- .brp_inc = 1,
+ .ref_clk = {
+ { .clk = 8000000, },
},
- .ref_clk = 32000000,
.printf_btr = printf_btr_sja1000,
}, {
.bittiming_const = {
.brp_max = 64,
.brp_inc = 1,
},
- .ref_clk = 33000000,
- .printf_btr = printf_btr_sja1000,
- }, {
- .bittiming_const = {
- .name = "mscan",
- .tseg1_min = 4,
- .tseg1_max = 16,
- .tseg2_min = 2,
- .tseg2_max = 8,
- .sjw_max = 4,
- .brp_min = 1,
- .brp_max = 64,
- .brp_inc = 1,
+ .ref_clk = {
+ { .clk = 32000000, },
+ { .clk = 33000000, },
+ { .clk = 33300000, },
+ { .clk = 33333333, },
+ { .clk = 66660000, .name = "mpc5121", },
+ { .clk = 66666666, .name = "mpc5121" },
},
- .ref_clk = 33300000,
- .printf_btr = printf_btr_sja1000,
- }, {
- .bittiming_const = {
- .name = "mscan",
- .tseg1_min = 4,
- .tseg1_max = 16,
- .tseg2_min = 2,
- .tseg2_max = 8,
- .sjw_max = 4,
- .brp_min = 1,
- .brp_max = 64,
- .brp_inc = 1,
- },
- .ref_clk = 33333333,
- .printf_btr = printf_btr_sja1000,
- }, {
- .bittiming_const = {
- .name = "mscan",
- .tseg1_min = 4,
- .tseg1_max = 16,
- .tseg2_min = 2,
- .tseg2_max = 8,
- .sjw_max = 4,
- .brp_min = 1,
- .brp_max = 64,
- .brp_inc = 1,
- },
- .ref_clk = 66660000, /* mpc5121 */
- .printf_btr = printf_btr_sja1000,
- }, {
- .bittiming_const = {
- .name = "mscan",
- .tseg1_min = 4,
- .tseg1_max = 16,
- .tseg2_min = 2,
- .tseg2_max = 8,
- .sjw_max = 4,
- .brp_min = 1,
- .brp_max = 64,
- .brp_inc = 1,
- },
- .ref_clk = 66666666, /* mpc5121 */
.printf_btr = printf_btr_sja1000,
}, {
.bittiming_const = {
.brp_max = 128,
.brp_inc = 1,
},
- .ref_clk = 100000000,
- .printf_btr = printf_btr_at91,
- }, {
- .bittiming_const = {
- .name = "at91",
- .tseg1_min = 4,
- .tseg1_max = 16,
- .tseg2_min = 2,
- .tseg2_max = 8,
- .sjw_max = 4,
- .brp_min = 2,
- .brp_max = 128,
- .brp_inc = 1,
+ .ref_clk = {
+ { .clk = 99532800, .name = "ronetix PM9263", },
+ { .clk = 100000000, },
},
- /* real world clock as found on the ronetix PM9263 */
- .ref_clk = 99532800,
.printf_btr = printf_btr_at91,
}, {
.bittiming_const = {
.brp_max = 256,
.brp_inc = 1,
},
- .ref_clk = 24000000, /* mx28 */
- .printf_btr = printf_btr_flexcan,
- }, {
- .bittiming_const = {
- .name = "flexcan",
- .tseg1_min = 4,
- .tseg1_max = 16,
- .tseg2_min = 2,
- .tseg2_max = 8,
- .sjw_max = 4,
- .brp_min = 1,
- .brp_max = 256,
- .brp_inc = 1,
- },
- .ref_clk = 30000000, /* mx6 */
- .printf_btr = printf_btr_flexcan,
- }, {
- .bittiming_const = {
- .name = "flexcan",
- .tseg1_min = 4,
- .tseg1_max = 16,
- .tseg2_min = 2,
- .tseg2_max = 8,
- .sjw_max = 4,
- .brp_min = 1,
- .brp_max = 256,
- .brp_inc = 1,
- },
- .ref_clk = 49875000,
- .printf_btr = printf_btr_flexcan,
- }, {
- .bittiming_const = {
- .name = "flexcan",
- .tseg1_min = 4,
- .tseg1_max = 16,
- .tseg2_min = 2,
- .tseg2_max = 8,
- .sjw_max = 4,
- .brp_min = 1,
- .brp_max = 256,
- .brp_inc = 1,
- },
- .ref_clk = 66000000,
- .printf_btr = printf_btr_flexcan,
- }, {
- .bittiming_const = {
- .name = "flexcan",
- .tseg1_min = 4,
- .tseg1_max = 16,
- .tseg2_min = 2,
- .tseg2_max = 8,
- .sjw_max = 4,
- .brp_min = 1,
- .brp_max = 256,
- .brp_inc = 1,
+ .ref_clk = {
+ { .clk = 24000000, .name = "mx28" },
+ { .clk = 30000000, .name = "mx6" },
+ { .clk = 49875000, },
+ { .clk = 66000000, },
+ { .clk = 66500000, },
+ { .clk = 66666666, },
+ { .clk = 83368421, .name = "vybrid" },
},
- .ref_clk = 66500000,
.printf_btr = printf_btr_flexcan,
- }, {
- .bittiming_const = {
- .name = "flexcan",
- .tseg1_min = 4,
- .tseg1_max = 16,
- .tseg2_min = 2,
- .tseg2_max = 8,
- .sjw_max = 4,
- .brp_min = 1,
- .brp_max = 256,
- .brp_inc = 1,
- },
- .ref_clk = 66666666,
- .printf_btr = printf_btr_flexcan,
- }, {
- .bittiming_const = {
- .name = "flexcan",
- .tseg1_min = 4,
- .tseg1_max = 16,
- .tseg2_min = 2,
- .tseg2_max = 8,
- .sjw_max = 4,
- .brp_min = 1,
- .brp_max = 256,
- .brp_inc = 1,
- },
- .ref_clk = 83368421,
- .printf_btr = printf_btr_flexcan, /* vybrid */
}, {
.bittiming_const = {
.name = "mcp251x",
.brp_max = 64,
.brp_inc = 1,
},
- .ref_clk = 8000000,
- .printf_btr = printf_btr_mcp251x,
- }, {
- .bittiming_const = {
- .name = "mcp251x",
- .tseg1_min = 3,
- .tseg1_max = 16,
- .tseg2_min = 2,
- .tseg2_max = 8,
- .sjw_max = 4,
- .brp_min = 1,
- .brp_max = 64,
- .brp_inc = 1,
+ .ref_clk = {
+ { .clk = 8000000, },
+ { .clk = 16000000, },
},
- .ref_clk = 16000000,
.printf_btr = printf_btr_mcp251x,
}, {
.bittiming_const = {
.brp_max = 256,
.brp_inc = 1,
},
- .ref_clk = 13000000,
+ .ref_clk = {
+ { .clk = 13000000, },
+ },
.printf_btr = printf_btr_ti_hecc,
}, {
.bittiming_const = {
.brp_max = 1024,
.brp_inc = 1,
},
- .ref_clk = 65000000,
+ .ref_clk = {
+ { .clk = 65000000, },
+ },
.printf_btr = printf_btr_rcar_can,
},
};
}
static void print_bit_timing(const struct calc_bittiming_const *btc,
- __u32 bitrate, __u32 sample_point, __u32 ref_clk,
+ const struct calc_ref_clk *ref_clk,
+ unsigned int bitrate_nominal,
+ unsigned int spt_nominal,
bool quiet)
{
struct net_device dev = {
- .priv.clock.freq = ref_clk,
+ .priv.clock.freq = ref_clk->clk,
};
struct can_bittiming bt = {
- .bitrate = bitrate,
- .sample_point = sample_point,
+ .bitrate = bitrate_nominal,
+ .sample_point = spt_nominal,
};
long rate_error, spt_error;
if (!quiet) {
- printf("Bit timing parameters for %s with %.6f MHz ref clock\n"
+ printf("Bit timing parameters for %s%s%s%s with %.6f MHz ref clock\n"
"nominal real Bitrt nom real SampP\n"
"Bitrate TQ[ns] PrS PhS1 PhS2 SJW BRP Bitrate Error SampP SampP Error ",
btc->bittiming_const.name,
- ref_clk / 1000000.0);
+ ref_clk->name ? " (" : "",
+ ref_clk->name ? ref_clk->name : "",
+ ref_clk->name ? ")" : "",
+ ref_clk->clk / 1000000.0);
btc->printf_btr(&bt, true);
printf("\n");
}
if (can_calc_bittiming(&dev, &bt, &btc->bittiming_const)) {
- printf("%7d ***bitrate not possible***\n", bitrate);
+ printf("%7d ***bitrate not possible***\n", bitrate_nominal);
return;
}
/* get nominal sample point */
- if (!sample_point)
- sample_point = get_cia_sample_point(bitrate);
+ if (!spt_nominal)
+ spt_nominal = get_cia_sample_point(bitrate_nominal);
- rate_error = abs(bitrate - bt.bitrate);
- spt_error = abs(sample_point - bt.sample_point);
+ rate_error = abs(bitrate_nominal - bt.bitrate);
+ spt_error = abs(spt_nominal - bt.sample_point);
printf("%7d "
"%6d %3d %4d %4d "
"%3d %3d "
"%7d %4.1f%% "
"%4.1f%% %4.1f%% %4.1f%% ",
- bitrate,
+ bitrate_nominal,
bt.tq, bt.prop_seg, bt.phase_seg1, bt.phase_seg2,
bt.sjw, bt.brp,
bt.bitrate,
- 100.0 * rate_error / bitrate,
+ 100.0 * rate_error / bitrate_nominal,
- sample_point / 10.0,
+ spt_nominal / 10.0,
bt.sample_point / 10.0,
- 100.0 * spt_error / sample_point);
+ 100.0 * spt_error / spt_nominal);
btc->printf_btr(&bt, false);
printf("\n");
int main(int argc, char *argv[])
{
- __u32 bitrate = 0;
- __u32 opt_ref_clk = 0, ref_clk;
+ __u32 bitrate_nominal = 0;
+ struct calc_ref_clk opt_ref_clk = {
+ .name = "cmd-line",
+ };
+ const struct calc_ref_clk *ref_clk;
unsigned int spt_nominal = 0;
bool quiet = false, list = false, found = false;
char *name = NULL;
- unsigned int i, j;
+ unsigned int i, j, k;
int opt;
- const struct calc_bittiming_const *btc = NULL;
+ const struct calc_bittiming_const *btc;
- while ((opt = getopt(argc, argv, "b:c:lps:")) != -1) {
+ while ((opt = getopt(argc, argv, "b:c:lqs:")) != -1) {
switch (opt) {
case 'b':
- bitrate = atoi(optarg);
+ bitrate_nominal = atoi(optarg);
break;
case 'c':
- opt_ref_clk = strtoul(optarg, NULL, 10);
+ opt_ref_clk.clk = strtoul(optarg, NULL, 10);
break;
case 'l':
found = true;
btc = &can_calc_consts[i];
- if (opt_ref_clk)
- ref_clk = opt_ref_clk;
- else
- ref_clk = btc->ref_clk;
-
- if (bitrate) {
- print_bit_timing(btc, bitrate, spt_nominal, ref_clk, quiet);
- } else {
- for (j = 0; j < ARRAY_SIZE(common_bitrates); j++)
- print_bit_timing(btc, common_bitrates[j],
- spt_nominal, ref_clk, j);
+ for (j = 0; j < ARRAY_SIZE(btc->ref_clk); j++) {
+ if (opt_ref_clk.clk)
+ ref_clk = &opt_ref_clk;
+ else
+ ref_clk = &btc->ref_clk[j];
+
+ if (!ref_clk->clk)
+ break;
+
+ if (bitrate_nominal) {
+ print_bit_timing(btc, ref_clk, bitrate_nominal,
+ spt_nominal, quiet);
+ } else {
+ for (k = 0; k < ARRAY_SIZE(common_bitrates); k++)
+ print_bit_timing(btc, ref_clk,
+ common_bitrates[k],
+ spt_nominal, k);
+ }
+ printf("\n");
+
+ if (opt_ref_clk.clk)
+ break;
}
- printf("\n");
}
if (!found) {
projects / can-utils.git / blobdiff