Branch data     Line data    Source code

       1                 :             : #include <stdint.h>
       2                 :             : 
       3                 :             : #include "can.h"
       4                 :             : #include "timing_util.h"
       5                 :             : 
       6                 :             : #if (CANLIB_BIT_TIME_US != 4)
       7                 :             : #warning "the bit time that can.h is expecting is not what timing_util is expecting"
       8                 :             : #endif
       9                 :             : 
      10                 :           0 : bool can_generate_timing_params(uint32_t system_freq, can_timing_t *timing) {
      11                 :             :         // this function is designed to create a bit time of 4 microseconds
      12   [ #  #  #  # ]:           0 :         switch (system_freq) {
      13                 :           0 :                 case 48000000:
      14                 :           0 :                         timing->brp = 7;
      15                 :           0 :                         timing->sjw = 3;
      16                 :           0 :                         timing->btlmode = 1;
      17                 :           0 :                         timing->sam = 0;
      18                 :           0 :                         timing->seg1ph = 4;
      19                 :           0 :                         timing->prseg = 0;
      20                 :           0 :                         timing->seg2ph = 4;
      21                 :           0 :                         return true;
      22                 :           0 :                 case 12000000:
      23                 :           0 :                         timing->brp = 1;
      24                 :           0 :                         timing->sjw = 3;
      25                 :           0 :                         timing->btlmode = 1;
      26                 :           0 :                         timing->sam = 0;
      27                 :           0 :                         timing->seg1ph = 4;
      28                 :           0 :                         timing->prseg = 0;
      29                 :           0 :                         timing->seg2ph = 4;
      30                 :           0 :                         return true;
      31                 :           0 :                 case 6000000:
      32                 :           0 :                         timing->brp = 0;
      33                 :           0 :                         timing->sjw = 3;
      34                 :           0 :                         timing->btlmode = 1;
      35                 :           0 :                         timing->sam = 0;
      36                 :           0 :                         timing->seg1ph = 4;
      37                 :           0 :                         timing->prseg = 0;
      38                 :           0 :                         timing->seg2ph = 4;
      39                 :           0 :                         return true;
      40                 :             :                 default:
      41                 :             :                         // unhandled can frequency, just abort
      42                 :             :                         return false;
      43                 :             :         }
      44                 :             : }