Code: Select all
#define SERIAL_SUM_PPM PITCH,YAW,THROTTLE,ROLL,AUX1,AUX2,AUX3,AUX4,AUX5 //For Chainlink????Code: Select all
//RAW RC values will be store here
#if defined(SBUS)
volatile uint16_t rcValue[18] = {1502, 1502, 1502, 1502, 1502, 1502, 1502, 1502, 1502, 1502, 1502, 1502, 1502, 1502, 1502, 1502, 1502, 1502}; // interval [1000;2000]
#else
volatile uint16_t rcValue[9] = {1502, 1502, 1502, 1502, 1502, 1502, 1502, 1502, 1502}; // interval [1000;2000]
#endifCode: Select all
#if defined(SERIAL_SUM_PPM) //Channel order for PPM SUM RX Configs
static uint8_t rcChannel[9] = {SERIAL_SUM_PPM};
#elif defined(SBUS) //Channel order for SBUS RX Configs
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// Read PPM SUM RX Data
#if defined(SERIAL_SUM_PPM)
void rxInt() {
uint16_t now,diff;
static uint16_t last = 0;
static uint8_t chan = 0;
now = micros();
diff = now - last;
last = now;
if(diff>3000) chan = 0;
else {
if(900<diff && diff<2200 && chan<9 ) { //Only if the signal is between these values it is valid, otherwise the failsafe counter should move up
rcValue[chan] = diff;
#if defined(FAILSAFE)
if(failsafeCnt > 20) failsafeCnt -= 20; else failsafeCnt = 0; // clear FailSafe counter
#endif
}
chan++;
}
}
#endifthere is compatible problem of volt peak of MCUs, we use the STM8, I think the multiwii may
use the atmel or PIC, is that right, the high and low volt peak is a little different which cause some compatibe problem
Hi, I am Wee from BEVRC, there is a problem for the ChainLinkdare is that the Tx's antenna and Rx's antenna shouldn't be too close, such as half a meter, which will cause the Rx enter a saturate mode, which we have mentioned in the manual. Ali encountered the same situation and he thought it's faulty and sent it back for check, indeed, it's a hardware bug, hope to get it sorted when the v1.1 hardware for the Rx released soon.
So, it's easy to get it worked well for most of the situation, don't get the Tx's antenna and Rx's antenna too close.
there is compatible problem of volt peak of MCUs, we use the STM8, I think the multiwii may
use the atmel or PIC, is that right, the high and low volt peak is a little different which cause some compatibe problem
howardhb wrote:
4.7V Zener diode would be fine.
Always good practice to add a current limiting resistor, but probably not necessary here.
also tried it with the resistor.Code: Select all
// When using negative PPM, high to low going pulses need to be found......
// The Rx interrupt must be set to trigger on FALLING edge to find the first pulse.
// During the last channel pulse measuring, we must set the interrupt to RISING edge in order to find the end of that last pulse.
// Then, set the interrupt back to FALLING edge.....to wait for channel 0 again
#if defined(SERIAL_SUM_PPM)
#if !defined(PROMICRO)
void rxInt() {
#else
ISR(INT6_vect){
#endif
uint16_t now,diff;
static uint16_t last = 0;
static uint8_t chan = 0;
now = micros();
diff = now - last;
last = now;
if(diff>3000) chan = 0;
else {
if(900<diff && diff<2200 && chan<9) { //Only if the signal is between these values it is valid, otherwise the failsafe counter should move up
rcValue[chan] = diff;
#if defined(FAILSAFE)
if(failsafeCnt > 20) failsafeCnt -= 20; else failsafeCnt = 0; // clear FailSafe counter - added by MIS //incompatible to quadroppm
#endif
}
chan++;
if(chan==8) attachInterrupt(0, rxInt, RISING); // Chainlink Dare has 9 channels... so set interrupt to catch the rising edge to find end of last channel
if(chan==9) attachInterrupt(0, rxInt, FALLING); //set interrupt back to falling edge to catch the first channel in the next loop after 3000 delay
}
}
#endifhowardhb wrote:Badbert, one last thing to try is a re-written rx routine specifically for negative ppm sum.
In a previous post you mentioned that setting falling edge interrupt helped, but not entirely.
For that to work correctly the rx routine needs to be modified slightly.
I am using a modified routine with a simple ppm sum encoder, made from diodes and a single transistor.
(the transistor effectively inverts the ppm sum from the receiver, thus requiring modified rx code)
In Def.h. ....attachInterrupt(0, rxInt, FALLING); //set interrupt to falling edge to catch the first channel
then, replace the rx function with the code below:Code: Select all
chan++;
if(chan==8) attachInterrupt(0, rxInt, RISING); // Chainlink Dare has 9 channels... so set interrupt to catch the rising edge to find end of last channel
if(chan==9) attachInterrupt(0, rxInt, FALLING); //set interrupt back to falling edge to catch the first channel in the next loop after 3000 delay
}
}
#endif
H.
copterrichie wrote:@Howard,
A thought occurred to me that if we were to replace the NPN Transistor with a PNP like a 2N3906, maybe that will do the trick. What is your opinion?
howardhb wrote:Good!
Consider moving the 1k bias resistor to the +5V vcc line so that the transistor is biased "off" . Might save a few mA.
H.
I believe we need that final pulse because when I used a known good PPM source, there is an extra pulse at the end of the stream.But there is still no channel Six detected by the MWC.
Mis wrote:But there is still no channel Six detected by the MWC.
If your receiver have more than 6 channels, connect one additional diode to channel 7 and you get 6 working channels.
