Line data    Source code

       1             : /*
       2             :  * This file is free software: you can redistribute it and/or modify it
       3             :  * under the terms of the GNU General Public License as published by the
       4             :  * Free Software Foundation, either version 3 of the License, or
       5             :  * (at your option) any later version.
       6             :  *
       7             :  * This file is distributed in the hope that it will be useful, but
       8             :  * WITHOUT ANY WARRANTY; without even the implied warranty of
       9             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
      10             :  * See the GNU General Public License for more details.
      11             :  *
      12             :  * You should have received a copy of the GNU General Public License along
      13             :  * with this program.  If not, see <http://www.gnu.org/licenses/>.
      14             :  */
      15             : 
      16             : #pragma once
      17             : 
      18             : #include "AP_RCProtocol.h"
      19             : 
      20             : class SoftSerial {
      21             : public:
      22             :     enum serial_config {
      23             :         SERIAL_CONFIG_8N1  = 0, // DSM, SRXL etc, 8 bit, no parity, 1 stop bit
      24             :         SERIAL_CONFIG_8E2I = 1, // SBUS, 8 bit, even parity, 2 stop bits, inverted
      25             :         SERIAL_CONFIG_8N1I = 2, // FPort inverted, 8 bit, no parity, 1 stop bit
      26             :     };
      27             : 
      28             :     SoftSerial(uint32_t baudrate, enum serial_config config);
      29             :     bool process_pulse(uint32_t width_s0, uint32_t width_s1, uint8_t &b);
      30             : 
      31             :     // get timestamp of the last byte
      32           0 :     uint32_t get_byte_timestamp_us(void) const {
      33           0 :         return byte_timestamp_us;
      34             :     }
      35             : 
      36           0 :     uint32_t baud() const { return baudrate; }
      37             : 
      38             : private:
      39             :     const uint32_t baudrate;
      40             :     const uint8_t half_bit; // width of half a bit in microseconds
      41             :     const enum serial_config config;
      42             : 
      43             :     uint8_t data_width;
      44             :     uint8_t byte_width;
      45             :     uint16_t stop_mask;
      46             :     uint32_t timestamp_us;
      47             :     uint32_t byte_timestamp_us;
      48             : 
      49             :     struct {
      50             :         uint32_t byte;
      51             :         uint16_t bit_ofs;
      52             :     } state;
      53             : };