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Protocol.cpp
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#include "Arduino.h"
#include "config.h"
#include "def.h"
#include "types.h"
#include "EEPROM.h"
#include "LCD.h"
#include "Output.h"
#include "GPS.h"
#include "BalancingWii.h"
#include "Serial.h"
#include "Protocol.h"
#include "RX.h"
/************************************** MultiWii Serial Protocol *******************************************************/
// Multiwii Serial Protocol 0
#define MSP_VERSION 0
//to multiwii developpers/committers : do not add new MSP messages without a proper argumentation/agreement on the forum
#define MSP_IDENT 100 //out message multitype + multiwii version + protocol version + capability variable
#define MSP_STATUS 101 //out message cycletime & errors_count & sensor present & box activation & current setting number
#define MSP_RAW_IMU 102 //out message 9 DOF
#define MSP_SERVO 103 //out message 8 servos
#define MSP_MOTOR 104 //out message 8 motors
#define MSP_RC 105 //out message 8 rc chan and more
#define MSP_RAW_GPS 106 //out message fix, numsat, lat, lon, alt, speed, ground course
#define MSP_COMP_GPS 107 //out message distance home, direction home
#define MSP_ATTITUDE 108 //out message 2 angles 1 heading
#define MSP_ALTITUDE 109 //out message altitude, variometer
#define MSP_ANALOG 110 //out message vbat, powermetersum, rssi if available on RX
#define MSP_RC_TUNING 111 //out message rc rate, rc expo, rollpitch rate, yaw rate, dyn throttle PID
#define MSP_PID 112 //out message P I D coeff (9 are used currently)
#define MSP_BOX 113 //out message BOX setup (number is dependant of your setup)
#define MSP_MISC 114 //out message powermeter trig
#define MSP_MOTOR_PINS 115 //out message which pins are in use for motors & servos, for GUI
#define MSP_BOXNAMES 116 //out message the aux switch names
#define MSP_PIDNAMES 117 //out message the PID names
#define MSP_WP 118 //out message get a WP, WP# is in the payload, returns (WP#, lat, lon, alt, flags) WP#0-home, WP#16-poshold
#define MSP_BOXIDS 119 //out message get the permanent IDs associated to BOXes
#define MSP_SERVO_CONF 120 //out message Servo settings
#define MSP_SET_RAW_RC 200 //in message 8 rc chan
#define MSP_SET_RAW_GPS 201 //in message fix, numsat, lat, lon, alt, speed
#define MSP_SET_PID 202 //in message P I D coeff (9 are used currently)
#define MSP_SET_BOX 203 //in message BOX setup (number is dependant of your setup)
#define MSP_SET_RC_TUNING 204 //in message rc rate, rc expo, rollpitch rate, yaw rate, dyn throttle PID
#define MSP_ACC_CALIBRATION 205 //in message no param
#define MSP_MAG_CALIBRATION 206 //in message no param
#define MSP_SET_MISC 207 //in message powermeter trig + 8 free for future use
#define MSP_RESET_CONF 208 //in message no param
#define MSP_SET_WP 209 //in message sets a given WP (WP#,lat, lon, alt, flags)
#define MSP_SELECT_SETTING 210 //in message Select Setting Number (0-2)
#define MSP_SET_HEAD 211 //in message define a new heading hold direction
#define MSP_SET_SERVO_CONF 212 //in message Servo settings
#define MSP_SET_MOTOR 214 //in message PropBalance function
#define MSP_BIND 240 //in message no param
#define MSP_EEPROM_WRITE 250 //in message no param
#define MSP_DEBUGMSG 253 //out message debug string buffer
#define MSP_DEBUG 254 //out message debug1,debug2,debug3,debug4
#ifdef DEBUGMSG
#define DEBUG_MSG_BUFFER_SIZE 128
static char debug_buf[DEBUG_MSG_BUFFER_SIZE];
static uint8_t head_debug;
static uint8_t tail_debug;
static uint8_t debugmsg_available();
static void debugmsg_serialize(uint8_t l);
#endif
static uint8_t CURRENTPORT=0;
#define INBUF_SIZE 64
static uint8_t inBuf[INBUF_SIZE][UART_NUMBER];
static uint8_t checksum[UART_NUMBER];
static uint8_t indRX[UART_NUMBER];
static uint8_t cmdMSP[UART_NUMBER];
void evaluateOtherData(uint8_t sr);
#ifndef SUPPRESS_ALL_SERIAL_MSP
void evaluateCommand();
#endif
#define BIND_CAPABLE 0; //Used for Spektrum today; can be used in the future for any RX type that needs a bind and has a MultiWii module.
#if defined(SPEK_BIND)
#define BIND_CAPABLE 1;
#endif
// Capability is bit flags; next defines should be 2, 4, 8...
const uint32_t capability = 0+BIND_CAPABLE;
uint8_t read8() {
return inBuf[indRX[CURRENTPORT]++][CURRENTPORT]&0xff;
}
uint16_t read16() {
uint16_t t = read8();
t+= (uint16_t)read8()<<8;
return t;
}
uint32_t read32() {
uint32_t t = read16();
t+= (uint32_t)read16()<<16;
return t;
}
void serialize8(uint8_t a) {
SerialSerialize(CURRENTPORT,a);
checksum[CURRENTPORT] ^= a;
}
void serialize16(int16_t a) {
serialize8((a ) & 0xFF);
serialize8((a>>8) & 0xFF);
}
void serialize32(uint32_t a) {
serialize8((a ) & 0xFF);
serialize8((a>> 8) & 0xFF);
serialize8((a>>16) & 0xFF);
serialize8((a>>24) & 0xFF);
}
void headSerialResponse(uint8_t err, uint8_t s) {
serialize8('$');
serialize8('M');
serialize8(err ? '!' : '>');
checksum[CURRENTPORT] = 0; // start calculating a new checksum
serialize8(s);
serialize8(cmdMSP[CURRENTPORT]);
}
void headSerialReply(uint8_t s) {
headSerialResponse(0, s);
}
void inline headSerialError(uint8_t s) {
headSerialResponse(1, s);
}
void tailSerialReply() {
serialize8(checksum[CURRENTPORT]);UartSendData(CURRENTPORT);
}
void serializeNames(PGM_P s) {
headSerialReply(strlen_P(s));
for (PGM_P c = s; pgm_read_byte(c); c++) {
serialize8(pgm_read_byte(c));
}
}
void serialCom() {
uint8_t c,n;
static uint8_t offset[UART_NUMBER];
static uint8_t dataSize[UART_NUMBER];
static enum _serial_state {
IDLE,
HEADER_START,
HEADER_M,
HEADER_ARROW,
HEADER_SIZE,
HEADER_CMD,
} c_state[UART_NUMBER];// = IDLE;
for(n=0;n<UART_NUMBER;n++) {
#if !defined(PROMINI)
CURRENTPORT=n;
#endif
#define GPS_COND
#if defined(GPS_SERIAL)
#if defined(GPS_PROMINI)
#define GPS_COND
#else
#undef GPS_COND
#define GPS_COND && (GPS_SERIAL != CURRENTPORT)
#endif
#endif
#define SPEK_COND
#if defined(SPEKTRUM) && (UART_NUMBER > 1)
#define SPEK_COND && (SPEK_SERIAL_PORT != CURRENTPORT)
#endif
#define SBUS_COND
#if defined(SBUS) && (UART_NUMBER > 1)
#define SBUS_COND && (SBUS_SERIAL_PORT != CURRENTPORT)
#endif
uint8_t cc = SerialAvailable(CURRENTPORT);
while (cc-- GPS_COND SPEK_COND SBUS_COND) {
uint8_t bytesTXBuff = SerialUsedTXBuff(CURRENTPORT); // indicates the number of occupied bytes in TX buffer
if (bytesTXBuff > TX_BUFFER_SIZE - 50 ) return; // ensure there is enough free TX buffer to go further (50 bytes margin)
c = SerialRead(CURRENTPORT);
#ifdef SUPPRESS_ALL_SERIAL_MSP
// no MSP handling, so go directly
evaluateOtherData(c);
#else
// regular data handling to detect and handle MSP and other data
if (c_state[CURRENTPORT] == IDLE) {
c_state[CURRENTPORT] = (c=='$') ? HEADER_START : IDLE;
if (c_state[CURRENTPORT] == IDLE) evaluateOtherData(c); // evaluate all other incoming serial data
} else if (c_state[CURRENTPORT] == HEADER_START) {
c_state[CURRENTPORT] = (c=='M') ? HEADER_M : IDLE;
} else if (c_state[CURRENTPORT] == HEADER_M) {
c_state[CURRENTPORT] = (c=='<') ? HEADER_ARROW : IDLE;
} else if (c_state[CURRENTPORT] == HEADER_ARROW) {
if (c > INBUF_SIZE) { // now we are expecting the payload size
c_state[CURRENTPORT] = IDLE;
continue;
}
dataSize[CURRENTPORT] = c;
offset[CURRENTPORT] = 0;
checksum[CURRENTPORT] = 0;
indRX[CURRENTPORT] = 0;
checksum[CURRENTPORT] ^= c;
c_state[CURRENTPORT] = HEADER_SIZE; // the command is to follow
} else if (c_state[CURRENTPORT] == HEADER_SIZE) {
cmdMSP[CURRENTPORT] = c;
checksum[CURRENTPORT] ^= c;
c_state[CURRENTPORT] = HEADER_CMD;
} else if (c_state[CURRENTPORT] == HEADER_CMD && offset[CURRENTPORT] < dataSize[CURRENTPORT]) {
checksum[CURRENTPORT] ^= c;
inBuf[offset[CURRENTPORT]++][CURRENTPORT] = c;
} else if (c_state[CURRENTPORT] == HEADER_CMD && offset[CURRENTPORT] >= dataSize[CURRENTPORT]) {
if (checksum[CURRENTPORT] == c) { // compare calculated and transferred checksum
evaluateCommand(); // we got a valid packet, evaluate it
}
c_state[CURRENTPORT] = IDLE;
cc = 0; // no more than one MSP per port and per cycle
}
#endif // SUPPRESS_ALL_SERIAL_MSP
}
}
}
void s_struct(uint8_t *cb,uint8_t siz) {
headSerialReply(siz);
while(siz--) serialize8(*cb++);
}
void s_struct_w(uint8_t *cb,uint8_t siz) {
headSerialReply(0);
while(siz--) *cb++ = read8();
}
#ifndef SUPPRESS_ALL_SERIAL_MSP
void evaluateCommand() {
uint32_t tmp=0;
switch(cmdMSP[CURRENTPORT]) {
case MSP_SET_RAW_RC:
s_struct_w((uint8_t*)&rcSerial,16);
rcSerialCount = 50; // 1s transition
break;
#if GPS
case MSP_SET_RAW_GPS:
f.GPS_FIX = read8();
GPS_numSat = read8();
GPS_coord[LAT] = read32();
GPS_coord[LON] = read32();
GPS_altitude = read16();
GPS_speed = read16();
GPS_update |= 2; // New data signalisation to GPS functions
headSerialReply(0);
break;
#endif
case MSP_SET_PID:
s_struct_w((uint8_t*)&conf.pid[0].P8,3*PIDITEMS);
break;
case MSP_SET_BOX:
s_struct_w((uint8_t*)&conf.activate[0],CHECKBOXITEMS*2);
break;
case MSP_SET_RC_TUNING:
s_struct_w((uint8_t*)&conf.rcRate8,7);
break;
#if !defined(DISABLE_SETTINGS_TAB)
case MSP_SET_MISC:
struct {
uint16_t a,b,c,d,e,f;
uint32_t g;
uint16_t h;
uint8_t i,j,k,l;
} set_misc;
s_struct_w((uint8_t*)&set_misc,22);
#if defined(POWERMETER)
conf.powerTrigger1 = set_misc.a / PLEVELSCALE;
#endif
conf.minthrottle = set_misc.b;
#ifdef FAILSAFE
conf.failsafe_throttle = set_misc.e;
#endif
#if MAG
conf.mag_declination = set_misc.h;
#endif
#if defined(VBAT)
conf.vbatscale = set_misc.i;
conf.vbatlevel_warn1 = set_misc.j;
conf.vbatlevel_warn2 = set_misc.k;
conf.vbatlevel_crit = set_misc.l;
#endif
break;
case MSP_MISC:
struct {
uint16_t a,b,c,d,e,f;
uint32_t g;
uint16_t h;
uint8_t i,j,k,l;
} misc;
misc.a = intPowerTrigger1;
misc.b = conf.minthrottle;
misc.c = MAXTHROTTLE;
misc.d = MINCOMMAND;
#ifdef FAILSAFE
misc.e = conf.failsafe_throttle;
#else
misc.e = 0;
#endif
#ifdef LOG_PERMANENT
misc.f = plog.arm;
misc.g = plog.lifetime + (plog.armed_time / 1000000); // <- computation must be moved outside from serial
#else
misc.f = 0; misc.g =0;
#endif
#if MAG
misc.h = conf.mag_declination;
#else
misc.h = 0;
#endif
#ifdef VBAT
misc.i = conf.vbatscale;
misc.j = conf.vbatlevel_warn1;
misc.k = conf.vbatlevel_warn2;
misc.l = conf.vbatlevel_crit;
#else
misc.i = 0;misc.j = 0;misc.k = 0;misc.l = 0;
#endif
s_struct((uint8_t*)&misc,22);
break;
#endif
#if defined (DYNBALANCE)
case MSP_SET_MOTOR:
s_struct_w((uint8_t*)&actualMotorSpeed,4);
break;
#endif
#ifdef MULTIPLE_CONFIGURATION_PROFILES
case MSP_SELECT_SETTING:
if(!f.ARMED) {
global_conf.currentSet = read8();
if(global_conf.currentSet>2) global_conf.currentSet = 0;
writeGlobalSet(0);
readEEPROM();
}
headSerialReply(0);
break;
#endif
case MSP_SET_HEAD:
s_struct_w((uint8_t*)&magHold,2);
break;
case MSP_IDENT:
struct {
uint8_t v,t,msp_v;
uint32_t cap;
} id;
id.v = VERSION;
id.t = MULTITYPE;
id.msp_v = MSP_VERSION;
id.cap = capability|DYNBAL<<2|FLAP<<3;
s_struct((uint8_t*)&id,7);
break;
case MSP_STATUS:
struct {
uint16_t cycleTime,i2c_errors_count,sensor;
uint32_t flag;
uint8_t set;
} st;
st.cycleTime = cycleTime;
st.i2c_errors_count = i2c_errors_count;
st.sensor = ACC|BARO<<1|MAG<<2|GPS<<3|SONAR<<4;
#if ACC
if(f.SIMPLE_MODE) tmp |= 1<<BOXSIMPLE;
if(f.RISE_MODE) tmp |= 1<<BOXRISE;
if(f.POSHOLD_MODE) tmp |= 1<<BOXPOSHOLD;
#endif
#if BARO && (!defined(SUPPRESS_BARO_ALTHOLD))
if(f.BARO_MODE) tmp |= 1<<BOXBARO;
#endif
#if MAG
if(f.MAG_MODE) tmp |= 1<<BOXMAG;
#if !defined(FIXEDWING)
if(f.HEADFREE_MODE) tmp |= 1<<BOXHEADFREE;
if(rcOptions[BOXHEADADJ]) tmp |= 1<<BOXHEADADJ;
#endif
#endif
#if defined(SERVO_TILT) || defined(GIMBAL)|| defined(SERVO_MIX_TILT)
if(rcOptions[BOXCAMSTAB]) tmp |= 1<<BOXCAMSTAB;
#endif
#if defined(CAMTRIG)
if(rcOptions[BOXCAMTRIG]) tmp |= 1<<BOXCAMTRIG;
#endif
#if GPS
if(f.GPS_HOME_MODE) tmp |= 1<<BOXGPSHOME;
if(f.GPS_HOLD_MODE) tmp |= 1<<BOXGPSHOLD;
#endif
#if defined(FIXEDWING) || defined(HELICOPTER)
if(f.PASSTHRU_MODE) tmp |= 1<<BOXPASSTHRU;
#endif
#if defined(BUZZER)
if(rcOptions[BOXBEEPERON]) tmp |= 1<<BOXBEEPERON;
#endif
#if defined(LED_FLASHER)
if(rcOptions[BOXLEDMAX]) tmp |= 1<<BOXLEDMAX;
if(rcOptions[BOXLEDLOW]) tmp |= 1<<BOXLEDLOW;
#endif
#if defined(LANDING_LIGHTS_DDR)
if(rcOptions[BOXLLIGHTS]) tmp |= 1<<BOXLLIGHTS;
#endif
#if defined(VARIOMETER)
if(rcOptions[BOXVARIO]) tmp |= 1<<BOXVARIO;
#endif
#if defined(INFLIGHT_ACC_CALIBRATION)
if(rcOptions[BOXCALIB]) tmp |= 1<<BOXCALIB;
#endif
#if defined(GOVERNOR_P)
if(rcOptions[BOXGOV]) tmp |= 1<<BOXGOV;
#endif
#if defined(OSD_SWITCH)
if(rcOptions[BOXOSD]) tmp |= 1<<BOXOSD;
#endif
if(f.ARMED) tmp |= 1<<BOXARM;
st.flag = tmp;
st.set = global_conf.currentSet;
s_struct((uint8_t*)&st,11);
break;
case MSP_RAW_IMU:
#if defined(DYNBALANCE)
for(uint8_t axis=0;axis<3;axis++) {imu.gyroData[axis]=imu.gyroADC[axis];imu.accSmooth[axis]= imu.accADC[axis];} // Send the unfiltered Gyro & Acc values to gui.
#endif
s_struct((uint8_t*)&imu,18);
break;
case MSP_SERVO:
//s_struct((uint8_t*)&servo,16);
//s_struct((uint8_t*)&actualMotorSpeed,4);
break;
case MSP_SERVO_CONF:
s_struct((uint8_t*)&conf.servoConf[0].min,56); // struct servo_conf_ is 7 bytes length: min:2 / max:2 / middle:2 / rate:1 ---- 8 servo => 8x7 = 56
break;
case MSP_SET_SERVO_CONF:
s_struct_w((uint8_t*)&conf.servoConf[0].min,56);
break;
case MSP_MOTOR:
motor[0] = actualMotorSpeed[0] + 1500;
motor[1] = actualMotorSpeed[1] + 1500;
s_struct((uint8_t*)&motor,4);
//s_struct((uint8_t*)&actualMotorSpeed,4);
break;
case MSP_RC:
s_struct((uint8_t*)&rcData,RC_CHANS*2);
break;
#if GPS
case MSP_RAW_GPS:
headSerialReply(16);
serialize8(f.GPS_FIX);
serialize8(GPS_numSat);
serialize32(GPS_coord[LAT]);
serialize32(GPS_coord[LON]);
serialize16(GPS_altitude);
serialize16(GPS_speed);
serialize16(GPS_ground_course); // added since r1172
break;
case MSP_COMP_GPS:
headSerialReply(5);
serialize16(GPS_distanceToHome);
serialize16(GPS_directionToHome);
serialize8(GPS_update & 1);
break;
#endif
case MSP_ATTITUDE:
s_struct((uint8_t*)&att,6);
break;
case MSP_ALTITUDE:
s_struct((uint8_t*)&alt,6);
break;
case MSP_ANALOG:
s_struct((uint8_t*)&analog,7);
break;
case MSP_RC_TUNING:
s_struct((uint8_t*)&conf.rcRate8,7);
break;
case MSP_PID:
s_struct((uint8_t*)&conf.pid[0].P8,3*PIDITEMS);
break;
case MSP_PIDNAMES:
serializeNames(pidnames);
break;
case MSP_BOX:
s_struct((uint8_t*)&conf.activate[0],2*CHECKBOXITEMS);
break;
case MSP_BOXNAMES:
serializeNames(boxnames);
break;
case MSP_BOXIDS:
headSerialReply(CHECKBOXITEMS);
for(uint8_t i=0;i<CHECKBOXITEMS;i++) {
serialize8(pgm_read_byte(&(boxids[i])));
}
break;
case MSP_MOTOR_PINS:
s_struct((uint8_t*)&DRIVER_PIN,5);
break;
#if defined(USE_MSP_WP)
case MSP_WP:
{
int32_t lat = 0,lon = 0;
uint8_t wp_no = read8(); //get the wp number
headSerialReply(18);
if (wp_no == 0) {
lat = GPS_home[LAT];
lon = GPS_home[LON];
} else if (wp_no == 16) {
lat = GPS_hold[LAT];
lon = GPS_hold[LON];
}
serialize8(wp_no);
serialize32(lat);
serialize32(lon);
serialize32(AltHold); //altitude (cm) will come here -- temporary implementation to test feature with apps
serialize16(0); //heading will come here (deg)
serialize16(0); //time to stay (ms) will come here
serialize8(0); //nav flag will come here
}
break;
case MSP_SET_WP:
{
int32_t lat = 0,lon = 0,alt = 0;
uint8_t wp_no = read8(); //get the wp number
lat = read32();
lon = read32();
alt = read32(); // to set altitude (cm)
read16(); // future: to set heading (deg)
read16(); // future: to set time to stay (ms)
read8(); // future: to set nav flag
if (wp_no == 0) {
GPS_home[LAT] = lat;
GPS_home[LON] = lon;
f.GPS_HOME_MODE = 0; // with this flag, GPS_set_next_wp will be called in the next loop -- OK with SERIAL GPS / OK with I2C GPS
f.GPS_FIX_HOME = 1;
if (alt != 0) AltHold = alt; // temporary implementation to test feature with apps
} else if (wp_no == 16) { // OK with SERIAL GPS -- NOK for I2C GPS / needs more code dev in order to inject GPS coord inside I2C GPS
GPS_hold[LAT] = lat;
GPS_hold[LON] = lon;
if (alt != 0) AltHold = alt; // temporary implementation to test feature with apps
#if !defined(I2C_GPS)
nav_mode = NAV_MODE_WP;
GPS_set_next_wp(&GPS_hold[LAT],&GPS_hold[LON]);
#endif
}
}
headSerialReply(0);
break;
#endif
case MSP_RESET_CONF:
if(!f.ARMED) LoadDefaults();
headSerialReply(0);
break;
case MSP_ACC_CALIBRATION:
if(!f.ARMED) calibratingA=512;
headSerialReply(0);
break;
case MSP_MAG_CALIBRATION:
if(!f.ARMED) f.CALIBRATE_MAG = 1;
headSerialReply(0);
break;
#if defined(SPEK_BIND)
case MSP_BIND:
spekBind();
headSerialReply(0);
break;
#endif
case MSP_EEPROM_WRITE:
writeParams(0);
headSerialReply(0);
break;
case MSP_DEBUG:
s_struct((uint8_t*)&debug,8);
break;
#ifdef DEBUGMSG
case MSP_DEBUGMSG:
{
uint8_t size = debugmsg_available();
if (size > 16) size = 16;
headSerialReply(size);
debugmsg_serialize(size);
}
break;
#endif
default: // we do not know how to handle the (valid) message, indicate error MSP $M!
headSerialError(0);
break;
}
tailSerialReply();
}
#endif // SUPPRESS_ALL_SERIAL_MSP
// evaluate all other incoming serial data
void evaluateOtherData(uint8_t sr) {
#ifndef SUPPRESS_OTHER_SERIAL_COMMANDS
switch (sr) {
// Note: we may receive weird characters here which could trigger unwanted features during flight.
// this could lead to a crash easily.
// Please use if (!f.ARMED) where neccessary
#ifdef LCD_CONF
case 's':
case 'S':
if (!f.ARMED) configurationLoop();
break;
#endif
#ifdef LOG_PERMANENT_SHOW_AT_L
case 'L':
if (!f.ARMED) dumpPLog(1);
break;
#endif
#if defined(LCD_TELEMETRY) && defined(LCD_TEXTSTAR)
case 'A': // button A press
toggle_telemetry(1);
break;
case 'B': // button B press
toggle_telemetry(2);
break;
case 'C': // button C press
toggle_telemetry(3);
break;
case 'D': // button D press
toggle_telemetry(4);
break;
case 'a': // button A release
case 'b': // button B release
case 'c': // button C release
case 'd': // button D release
break;
#endif
#ifdef LCD_TELEMETRY
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
#ifndef SUPPRESS_TELEMETRY_PAGE_R
case 'R':
#endif
#if defined(DEBUG) || defined(DEBUG_FREE)
case 'F':
#endif
toggle_telemetry(sr);
break;
#endif // LCD_TELEMETRY
}
#endif // SUPPRESS_OTHER_SERIAL_COMMANDS
}
#ifdef DEBUGMSG
void debugmsg_append_str(const char *str) {
while(*str) {
debug_buf[head_debug++] = *str++;
if (head_debug == DEBUG_MSG_BUFFER_SIZE) {
head_debug = 0;
}
}
}
static uint8_t debugmsg_available() {
if (head_debug >= tail_debug) {
return head_debug-tail_debug;
} else {
return head_debug + (DEBUG_MSG_BUFFER_SIZE-tail_debug);
}
}
static void debugmsg_serialize(uint8_t l) {
for (uint8_t i=0; i<l; i++) {
if (head_debug != tail_debug) {
serialize8(debug_buf[tail_debug++]);
if (tail_debug == DEBUG_MSG_BUFFER_SIZE) {
tail_debug = 0;
}
} else {
serialize8('\0');
}
}
}
#else
void debugmsg_append_str(const char *str) {};
#endif