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feat: trainer SBUS processing in IDLE IRQ (#5672)

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This commit is contained in:
3djc
2024-11-25 10:58:53 +10:00
committed by GitHub
parent b35baecfb9
commit 7594a47a2d
5 changed files with 65 additions and 102 deletions
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radio/src/sbus.cpp
+41 -68
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@@ -19,54 +19,63 @@
* GNU General Public License for more details.
*/
#include "edgetx.h"
#include "sbus.h"
#include "edgetx.h"
#include "timers_driver.h"
#define SBUS_FRAME_GAP_DELAY_US 500
#define SBUS_FRAME_SIZE 25
#define SBUS_START_BYTE 0x0F
#define SBUS_END_BYTE 0x00
#define SBUS_FLAGS_IDX 23
#define SBUS_FRAMELOST_BIT 2
#define SBUS_FAILSAFE_BIT 3
#define SBUS_START_BYTE 0x0F
#define SBUS_END_BYTE 0x00
#define SBUS_FLAGS_IDX 23
#define SBUS_FRAMELOST_BIT 2
#define SBUS_FAILSAFE_BIT 3
#define SBUS_CH_BITS 11
#define SBUS_CH_MASK ((1 << SBUS_CH_BITS) - 1)
#define SBUS_CH_BITS 11
#define SBUS_CH_MASK ((1<<SBUS_CH_BITS) - 1)
#define SBUS_CH_CENTER 0x3E0
#define SBUS_CH_CENTER 0x3E0
static const etx_serial_driver_t* _sbus_drv = nullptr;
static void* _sbus_ctx = nullptr;
static bool _sbus_aux_enabled = false;
static int (*_sbusAuxGetByte)(void*, uint8_t*) = nullptr;
static void* _sbusAuxGetByteCtx = nullptr;
static void sbusProcessFrame(int16_t* pulses, uint8_t* sbus, uint32_t size);
void sbusSetAuxGetByte(void* ctx, int (*fct)(void*, uint8_t*))
void sbusSetReceiveCtx(void* ctx, const etx_serial_driver_t* drv)
{
_sbusAuxGetByte = nullptr;
_sbusAuxGetByteCtx = ctx;
_sbusAuxGetByte = fct;
_sbus_ctx = ctx;
_sbus_drv = drv;
}
int sbusAuxGetByte(uint8_t* byte)
void sbusAuxFrameReceived(void*)
{
auto _getByte = _sbusAuxGetByte;
auto _ctx = _sbusAuxGetByteCtx;
if (!_sbus_aux_enabled) return;
sbusFrameReceived(nullptr);
}
if (_getByte) {
return _getByte(_ctx, byte);
void sbusAuxSetEnabled(bool enabled) { _sbus_aux_enabled = enabled; }
void sbusFrameReceived(void*)
{
if (!_sbus_drv || !_sbus_ctx || !_sbus_drv->copyRxBuffer ||
!_sbus_drv->getBufferedBytes)
return;
if (_sbus_drv->getBufferedBytes(_sbus_ctx) != SBUS_FRAME_SIZE) {
_sbus_drv->clearRxBuffer(_sbus_ctx);
return;
}
return -1;
}
uint8_t frame[SBUS_FRAME_SIZE];
int received = _sbus_drv->copyRxBuffer(_sbus_ctx, frame, SBUS_FRAME_SIZE);
if (received < 0) return;
static int (*sbusGetByte)(uint8_t*) = nullptr;
void sbusSetGetByte(int (*fct)(uint8_t*))
{
sbusGetByte = fct;
sbusProcessFrame(trainerInput, frame, received);
}
// Range for pulses (ppm input) is [-512:+512]
void processSbusFrame(uint8_t * sbus, int16_t * pulses, uint32_t size)
static void sbusProcessFrame(int16_t* pulses, uint8_t* sbus, uint32_t size)
{
if (size != SBUS_FRAME_SIZE || sbus[0] != SBUS_START_BYTE ||
sbus[SBUS_FRAME_SIZE - 1] != SBUS_END_BYTE) {
@@ -77,55 +86,19 @@ void processSbusFrame(uint8_t * sbus, int16_t * pulses, uint32_t size)
return; // SBUS invalid frame or failsafe mode
}
sbus++; // skip start byte
sbus++; // skip start byte
uint32_t inputbitsavailable = 0;
uint32_t inputbits = 0;
for (uint32_t i=0; i<MAX_TRAINER_CHANNELS; i++) {
for (uint32_t i = 0; i < MAX_TRAINER_CHANNELS; i++) {
while (inputbitsavailable < SBUS_CH_BITS) {
inputbits |= *sbus++ << inputbitsavailable;
inputbitsavailable += 8;
}
*pulses++ = ((int32_t) (inputbits & SBUS_CH_MASK) - SBUS_CH_CENTER) * 5 / 8;
*pulses++ = ((int32_t)(inputbits & SBUS_CH_MASK) - SBUS_CH_CENTER) * 5 / 8;
inputbitsavailable -= SBUS_CH_BITS;
inputbits >>= SBUS_CH_BITS;
}
trainerResetTimer();
}
void processSbusInput()
{
// TODO: place this outside of the function
static uint8_t SbusIndex = 0;
static uint32_t SbusTimer;
static uint8_t SbusFrame[SBUS_FRAME_SIZE];
uint32_t active = 0;
// Drain input first (if existing)
uint8_t rxchar;
auto _getByte = sbusGetByte;
while (_getByte && (_getByte(&rxchar) > 0)) {
active = 1;
if (SbusIndex > SBUS_FRAME_SIZE - 1) {
SbusIndex = SBUS_FRAME_SIZE - 1;
}
SbusFrame[SbusIndex++] = rxchar;
}
// Data has been received
if (active) {
SbusTimer = timersGetUsTick();
return;
}
// Check if end-of-frame is detected
if (SbusIndex) {
if ((uint32_t)(timersGetUsTick() - SbusTimer) > SBUS_FRAME_GAP_DELAY_US) {
processSbusFrame(SbusFrame, trainerInput, SbusIndex);
SbusIndex = 0;
}
}
}