diff options
Diffstat (limited to 'board/esd/plu405/plu405.c')
| -rw-r--r-- | board/esd/plu405/plu405.c | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/board/esd/plu405/plu405.c b/board/esd/plu405/plu405.c index e385a78..0f7fa69 100644 --- a/board/esd/plu405/plu405.c +++ b/board/esd/plu405/plu405.c @@ -46,6 +46,34 @@ const unsigned char fpgadata[] = */ #include "../common/fpga.c" +/* + * generate a short spike on the CAN tx line + * to bring the couplers in sync + */ +void init_coupler(u32 addr) +{ + struct sja1000_basic_s *ctrl = (struct sja1000_basic_s *)addr; + + /* reset */ + out_8(&ctrl->cr, CR_RR); + + /* dominant */ + out_8(&ctrl->btr0, 0x00); /* btr setup is required */ + out_8(&ctrl->btr1, 0x14); /* we use 1Mbit/s */ + out_8(&ctrl->oc, OC_TP1 | OC_TN1 | OC_POL1 | + OC_TP0 | OC_TN0 | OC_POL0 | OC_MODE1); + out_8(&ctrl->cr, 0x00); + + /* delay */ + in_8(&ctrl->cr); + in_8(&ctrl->cr); + in_8(&ctrl->cr); + in_8(&ctrl->cr); + + /* reset */ + out_8(&ctrl->cr, CR_RR); +} + int board_early_init_f(void) { /* |