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btstack_slip: send C0 (SOF) before and after frame

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This commit is contained in:
Matthias Ringwald 2021-02-26 21:00:11 +01:00
parent 6950433682
commit 4a2b7fea83
1 changed files with 20 additions and 6 deletions
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26
src/btstack_slip.c
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@ -47,6 +47,7 @@
typedef enum {
SLIP_ENCODER_DEFAULT,
SLIP_ENCODER_SEND_C0,
SLIP_ENCODER_SEND_DC,
SLIP_ENCODER_SEND_DD
} btstack_slip_encoder_state_t;
@ -81,7 +82,8 @@ static uint16_t decoder_pos;
* @param len
*/
void btstack_slip_encoder_start(const uint8_t * data, uint16_t len){
encoder_state = SLIP_ENCODER_DEFAULT;
// start with C0 SOF
encoder_state = SLIP_ENCODER_SEND_C0;
encoder_data = data;
encoder_len = len;
}
@ -108,24 +110,36 @@ uint8_t btstack_slip_encoder_get_byte(void){
switch (next_byte){
case BTSTACK_SLIP_SOF:
encoder_state = SLIP_ENCODER_SEND_DC;
return 0xdb;
next_byte = 0xdb;
break;
case 0xdb:
encoder_state = SLIP_ENCODER_SEND_DD;
return 0xdb;
next_byte = 0xdb;
default:
break;
}
return next_byte;
break;
case SLIP_ENCODER_SEND_C0:
encoder_state = SLIP_ENCODER_DEFAULT;
return 0xc0;
case SLIP_ENCODER_SEND_DC:
encoder_state = SLIP_ENCODER_DEFAULT;
return 0x0dc;
next_byte = 0xdc;
break;
case SLIP_ENCODER_SEND_DD:
encoder_state = SLIP_ENCODER_DEFAULT;
return 0x0dd;
next_byte = 0x0dd;
break;
default:
log_error("btstack_slip_encoder_get_byte invalid state %x", encoder_state);
return 0x00;
}
// After last byte, send CO SOF again
if ((encoder_state == SLIP_ENCODER_DEFAULT) && (encoder_len == 0)){
encoder_state = SLIP_ENCODER_SEND_C0;
}
return next_byte;
}
// Decoder