miad711为什么这么火Imax=E/R0
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时间：2017-11-17 15:28
>> gps.txt
gps.txt ( File view )
; generated by Component: ARM Compiler 5.05 update 1 (build 106) Tool: ArmCC [4d0efa]
; commandline ArmCC [--c99 --list --debug -c --asm --interleave --gnu -o.\obj\gps.o --asm_dir=.\obj\ --list_dir=.\obj\ --depend=.\obj\gps.d --cpu=Cortex-M3 --apcs=interwork -O0 --diag_suppress=9931 -Ilib\CMSIS\CM3\CoreSupport -Ilib\CMSIS\CM3\DeviceSupport\ST\STM32F10x -Ilib\STM32F10x_StdPeriph_Driver\inc -ID:\MDK5\ARM\RV31\INC -ID:\MDK5\ARM\CMSIS\Include -ID:\MDK5\ARM\Inc\ST\STM32F10x -D__MICROLIB -D__UVISION_VERSION=514 -DSTM32F10X_MD -DUSE_STDPERIPH_DRIVER -DNAZE --omf_browse=.\obj\gps.crf src\gps.c]
AREA ||.text||, CODE, READONLY, ALIGN=2
gpsSetState PROC
static void gpsSetState(uint8_t state)
gpsData.state =
r0,|L1.1004|
r4,[r0,#0]
gpsData.state_position = 0;
r1,|L1.1004|
r0,[r1,#0x1c] gpsData
gpsData.state_ts = millis();
r1,|L1.1004|
r0,[r1,#0x24] gpsData
gpsData.config_position = 0;
r0,[r1,#0x20] gpsData
gpsSetPIDs PROC
// Get the relevant P I D values and set the PID controllers
void gpsSetPIDs(void)
posholdPID_PARAM.kP = (float)cfg.P8[PIDPOS] / 100.0f;
r1,|L1.1008|
r0,[r1,#5]
__aeabi_ui2f
r1,|L1.1012|
__aeabi_fdiv
r1,|L1.1016|
r0,[r1,#0] posholdPID_PARAM
posholdPID_PARAM.kI = (float)cfg.I8[PIDPOS] / 100.0f;
r1,|L1.1008|
r0,[r1,#0xf]
__aeabi_ui2f
r1,|L1.1012|
__aeabi_fdiv
r1,|L1.1016|
r0,[r1,#4] posholdPID_PARAM
posholdPID_PARAM.Imax = POSHOLD_RATE_IMAX * 100;
r0,|L1.1020|
r0,[r1,#0xc] posholdPID_PARAM
poshold_ratePID_PARAM.kP = (float)cfg.P8[PIDPOSR] / 10.0f;
r1,|L1.1008|
r0,[r1,#6]
__aeabi_ui2f
r1,|L1.1024|
__aeabi_fdiv
r1,|L1.1028|
r0,[r1,#0] poshold_ratePID_PARAM
poshold_ratePID_PARAM.kI = (float)cfg.I8[PIDPOSR] / 100.0f;
r1,|L1.1008|
r0,[r1,#0x10]
__aeabi_ui2f
r1,|L1.1012|
__aeabi_fdiv
r1,|L1.1028|
r0,[r1,#4] poshold_ratePID_PARAM
poshold_ratePID_PARAM.kD = (float)cfg.D8[PIDPOSR] / 1000.0f;
r1,|L1.1008|
r0,[r1,#0x1a]
__aeabi_ui2f
r1,|L1.1032|
__aeabi_fdiv
r1,|L1.1028|
r0,[r1,#8] poshold_ratePID_PARAM
poshold_ratePID_PARAM.Imax = POSHOLD_RATE_IMAX * 100;
r0,|L1.1020|
r0,[r1,#0xc] poshold_ratePID_PARAM
navPID_PARAM.kP = (float)cfg.P8[PIDNAVR] / 10.0f;
r1,|L1.1008|
r0,[r1,#7]
__aeabi_ui2f
r1,|L1.1024|
__aeabi_fdiv
r1,|L1.1036|
r0,[r1,#0] navPID_PARAM
navPID_PARAM.kI = (float)cfg.I8[PIDNAVR] / 100.0f;
r1,|L1.1008|
r0,[r1,#0x11]
__aeabi_ui2f
r1,|L1.1012|
__aeabi_fdiv
r1,|L1.1036|
r0,[r1,#4] navPID_PARAM
navPID_PARAM.kD = (float)cfg.D8[PIDNAVR] / 1000.0f;
r1,|L1.1008|
r0,[r1,#0x1b]
__aeabi_ui2f
r1,|L1.1032|
__aeabi_fdiv
r1,|L1.1036|
r0,[r1,#8] navPID_PARAM
navPID_PARAM.Imax = POSHOLD_RATE_IMAX * 100;
r0,|L1.1020|
r0,[r1,#0xc] navPID_PARAM
if (f.FIXED_WING) {
r0,|L1.1040|
r0,[r0,#0x10] f
r0,|L1.268|
altPID_PARAM.kP
= (float)cfg.P8[PIDALT] / 10.0f;
r1,|L1.1008|
r0,[r1,#4]
__aeabi_ui2f
r1,|L1.1024|
__aeabi_fdiv
r1,|L1.1044|
r0,[r1,#0] altPID_PARAM
altPID_PARAM.kI
= (float)cfg.I8[PIDALT] / 100.0f;
r1,|L1.1008|
r0,[r1,#0xe]
__aeabi_ui2f
r1,|L1.1012|
__aeabi_fdiv
r1,|L1.1044|
r0,[r1,#4] altPID_PARAM
altPID_PARAM.kD
= (float)cfg.D8[PIDALT] / 1000.0f;
r1,|L1.1008|
r0,[r1,#0x18]
__aeabi_ui2f
r1,|L1.1032|
__aeabi_fdiv
r1,|L1.1044|
r0,[r1,#8] altPID_PARAM
gpsInit PROC
void gpsInit(uint8_t baudrateIndex)
portMode_t mode = MODE_RXTX;
// init gpsData structure. if we're not actually enabled, don't bother doing anything else
gpsSetState(GPS_UNKNOWN);
gpsSetState
if (!feature(FEATURE_GPS))
r0,|L1.294|
if (feature(FEATURE_SERIALRX) && !feature(FEATURE_SOFTSERIAL) && !mcfg.spektrum_sat_on_flexport)
gpsData.baudrateIndex = baudrateI
gpsData.lastMessage = millis();
gpsData.errors = 0;
// only RX is needed for NMEA-style GPS
if (mcfg.gps_type == GPS_NMEA)
mode = MODE_RX;
gpsSetPIDs();
if (feature(FEATURE_SERIALRX) && feature(FEATURE_SOFTSERIAL) && !mcfg.spektrum_sat_on_flexport) {
if (gpsInitData[baudrateIndex].baudrate & SOFT_SERIAL_MAX_BAUD_RATE) {
mcfg.softserial_baudrate = SOFT_SERIAL_MAX_BAUD_RATE;
for (i = 0; i & GPS_INIT_ENTRIES; i++)
if (SOFT_SERIAL_MAX_BAUD_RATE == gpsInitData[i].baudrate)
mcfg.gps_baudrate = gpsInitData[i].
mcfg.softserial_baudrate = gpsInitData[baudrateIndex].
// If SerialRX is in use then use soft serial ports for GPS (pin 5 & 6)
core.gpsport = &(softSerialPorts[0].port);
// Open GPS UART, no callback - buffer will be read out in gpsThread()
core.gpsport = uartOpen(USART2, NULL, gpsInitData[baudrateIndex].baudrate, mode);
// signal GPS &thread& to initialize when it
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还剩 5 秒&扫二维码下载作业帮
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如图所示的电路中，电池的电动势E=5V，内电阻r=10Ω，固定电阻R=90Ω，R0是可变电阻．在R0由0增加到400Ω的过程中，求：（1）可变电阻R0上消耗热功率最大的条件和最大热功率；（2）电池的内电阻r和固定电阻R上消耗的最小热功率之和．
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（1）根据电源的内电阻和外电阻相等的时候，电源的输出功率最大可知，当把R0和电源看做一个整体时，即把电源的内阻看做R0+r，当R=R0+r时，即R=100Ω时，电源的输出功率最大，即R上获得最大功率，此时电路中电流为 I=0+R)＝52×100＝0.025AR上消耗的最大热功率为P=I2R=0.0252×100W=0.0625W（2）当R=400Ω的时候，电路中电流最小，则电池的内电阻r和电阻R0上消耗的热功率之和最小，此时电路中电流为Imin=0+r+R＝5500＝0.01则内电阻r和电阻R0上消耗的热功率之和最小值为Pmin=max2(R0+r)＝0.012×100=0.01W答：（1）可变电阻上消耗热功率最大的条件是R为100Ω，最大热功率是0.0625W；（2）电池的内电阻r和电阻R0上消耗的热功率之和的最小值是0.01W．
为您推荐：
（1）当电源的内电阻和外电阻相等的时候，电源的输出功率最大．可将R0是看成电源的内阻，当等效电源的内阻等于R时，R的功率最大，再由功率公式求解最大功率．（2）r和R0为定值电阻，R为可变电阻，根据P=I2R0可以分析电阻r和R0的功率之和，当R最大时，电路中电流最小，所求功率最小．
本题考点：
电功、电功率．
考点点评：
对于R的功率的分析是本题的难点，通常的分析方法都是把R0和电源看做一个整体来分析电源的输出功率的变化情况，即为R的功率的情况．
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gps.txt ( File view )
; generated by Component: ARM Compiler 5.05 update 1 (build 106) Tool: ArmCC [4d0efa]
; commandline ArmCC [--c99 --list --debug -c --asm --interleave --gnu -o.\obj\gps.o --asm_dir=.\obj\ --list_dir=.\obj\ --depend=.\obj\gps.d --cpu=Cortex-M3 --apcs=interwork -O0 --diag_suppress=9931 -Ilib\CMSIS\CM3\CoreSupport -Ilib\CMSIS\CM3\DeviceSupport\ST\STM32F10x -Ilib\STM32F10x_StdPeriph_Driver\inc -ID:\MDK5\ARM\RV31\INC -ID:\MDK5\ARM\CMSIS\Include -ID:\MDK5\ARM\Inc\ST\STM32F10x -D__MICROLIB -D__UVISION_VERSION=514 -DSTM32F10X_MD -DUSE_STDPERIPH_DRIVER -DNAZE --omf_browse=.\obj\gps.crf src\gps.c]
AREA ||.text||, CODE, READONLY, ALIGN=2
gpsSetState PROC
static void gpsSetState(uint8_t state)
gpsData.state =
r0,|L1.1004|
r4,[r0,#0]
gpsData.state_position = 0;
r1,|L1.1004|
r0,[r1,#0x1c] gpsData
gpsData.state_ts = millis();
r1,|L1.1004|
r0,[r1,#0x24] gpsData
gpsData.config_position = 0;
r0,[r1,#0x20] gpsData
gpsSetPIDs PROC
// Get the relevant P I D values and set the PID controllers
void gpsSetPIDs(void)
posholdPID_PARAM.kP = (float)cfg.P8[PIDPOS] / 100.0f;
r1,|L1.1008|
r0,[r1,#5]
__aeabi_ui2f
r1,|L1.1012|
__aeabi_fdiv
r1,|L1.1016|
r0,[r1,#0] posholdPID_PARAM
posholdPID_PARAM.kI = (float)cfg.I8[PIDPOS] / 100.0f;
r1,|L1.1008|
r0,[r1,#0xf]
__aeabi_ui2f
r1,|L1.1012|
__aeabi_fdiv
r1,|L1.1016|
r0,[r1,#4] posholdPID_PARAM
posholdPID_PARAM.Imax = POSHOLD_RATE_IMAX * 100;
r0,|L1.1020|
r0,[r1,#0xc] posholdPID_PARAM
poshold_ratePID_PARAM.kP = (float)cfg.P8[PIDPOSR] / 10.0f;
r1,|L1.1008|
r0,[r1,#6]
__aeabi_ui2f
r1,|L1.1024|
__aeabi_fdiv
r1,|L1.1028|
r0,[r1,#0] poshold_ratePID_PARAM
poshold_ratePID_PARAM.kI = (float)cfg.I8[PIDPOSR] / 100.0f;
r1,|L1.1008|
r0,[r1,#0x10]
__aeabi_ui2f
r1,|L1.1012|
__aeabi_fdiv
r1,|L1.1028|
r0,[r1,#4] poshold_ratePID_PARAM
poshold_ratePID_PARAM.kD = (float)cfg.D8[PIDPOSR] / 1000.0f;
r1,|L1.1008|
r0,[r1,#0x1a]
__aeabi_ui2f
r1,|L1.1032|
__aeabi_fdiv
r1,|L1.1028|
r0,[r1,#8] poshold_ratePID_PARAM
poshold_ratePID_PARAM.Imax = POSHOLD_RATE_IMAX * 100;
r0,|L1.1020|
r0,[r1,#0xc] poshold_ratePID_PARAM
navPID_PARAM.kP = (float)cfg.P8[PIDNAVR] / 10.0f;
r1,|L1.1008|
r0,[r1,#7]
__aeabi_ui2f
r1,|L1.1024|
__aeabi_fdiv
r1,|L1.1036|
r0,[r1,#0] navPID_PARAM
navPID_PARAM.kI = (float)cfg.I8[PIDNAVR] / 100.0f;
r1,|L1.1008|
r0,[r1,#0x11]
__aeabi_ui2f
r1,|L1.1012|
__aeabi_fdiv
r1,|L1.1036|
r0,[r1,#4] navPID_PARAM
navPID_PARAM.kD = (float)cfg.D8[PIDNAVR] / 1000.0f;
r1,|L1.1008|
r0,[r1,#0x1b]
__aeabi_ui2f
r1,|L1.1032|
__aeabi_fdiv
r1,|L1.1036|
r0,[r1,#8] navPID_PARAM
navPID_PARAM.Imax = POSHOLD_RATE_IMAX * 100;
r0,|L1.1020|
r0,[r1,#0xc] navPID_PARAM
if (f.FIXED_WING) {
r0,|L1.1040|
r0,[r0,#0x10] f
r0,|L1.268|
altPID_PARAM.kP
= (float)cfg.P8[PIDALT] / 10.0f;
r1,|L1.1008|
r0,[r1,#4]
__aeabi_ui2f
r1,|L1.1024|
__aeabi_fdiv
r1,|L1.1044|
r0,[r1,#0] altPID_PARAM
altPID_PARAM.kI
= (float)cfg.I8[PIDALT] / 100.0f;
r1,|L1.1008|
r0,[r1,#0xe]
__aeabi_ui2f
r1,|L1.1012|
__aeabi_fdiv
r1,|L1.1044|
r0,[r1,#4] altPID_PARAM
altPID_PARAM.kD
= (float)cfg.D8[PIDALT] / 1000.0f;
r1,|L1.1008|
r0,[r1,#0x18]
__aeabi_ui2f
r1,|L1.1032|
__aeabi_fdiv
r1,|L1.1044|
r0,[r1,#8] altPID_PARAM
gpsInit PROC
void gpsInit(uint8_t baudrateIndex)
portMode_t mode = MODE_RXTX;
// init gpsData structure. if we're not actually enabled, don't bother doing anything else
gpsSetState(GPS_UNKNOWN);
gpsSetState
if (!feature(FEATURE_GPS))
r0,|L1.294|
if (feature(FEATURE_SERIALRX) && !feature(FEATURE_SOFTSERIAL) && !mcfg.spektrum_sat_on_flexport)
gpsData.baudrateIndex = baudrateI
gpsData.lastMessage = millis();
gpsData.errors = 0;
// only RX is needed for NMEA-style GPS
if (mcfg.gps_type == GPS_NMEA)
mode = MODE_RX;
gpsSetPIDs();
if (feature(FEATURE_SERIALRX) && feature(FEATURE_SOFTSERIAL) && !mcfg.spektrum_sat_on_flexport) {
if (gpsInitData[baudrateIndex].baudrate & SOFT_SERIAL_MAX_BAUD_RATE) {
mcfg.softserial_baudrate = SOFT_SERIAL_MAX_BAUD_RATE;
for (i = 0; i & GPS_INIT_ENTRIES; i++)
if (SOFT_SERIAL_MAX_BAUD_RATE == gpsInitData[i].baudrate)
mcfg.gps_baudrate = gpsInitData[i].
mcfg.softserial_baudrate = gpsInitData[baudrateIndex].
// If SerialRX is in use then use soft serial ports for GPS (pin 5 & 6)
core.gpsport = &(softSerialPorts[0].port);
// Open GPS UART, no callback - buffer will be read out in gpsThread()
core.gpsport = uartOpen(USART2, NULL, gpsInitData[baudrateIndex].baudrate, mode);
// signal GPS &thread& to initialize when it
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如图所示的电路中，电池的电动势E=5V，内电阻r=10Ω，固定电阻R=90Ω，R0是可变电阻．在R0由0增加到400Ω的过程中，求：（1）可变电阻R0上消耗热功率最大的条件和最大热功率；（2）电池的内电阻r和固定电阻R上消耗的最小热功率之和．
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（1）根据电源的内电阻和外电阻相等的时候，电源的输出功率最大可知，当把R0和电源看做一个整体时，即把电源的内阻看做R0+r，当R=R0+r时，即R=100Ω时，电源的输出功率最大，即R上获得最大功率，此时电路中电流为 I=0+R)＝52×100＝0.025AR上消耗的最大热功率为P=I2R=0.0252×100W=0.0625W（2）当R=400Ω的时候，电路中电流最小，则电池的内电阻r和电阻R0上消耗的热功率之和最小，此时电路中电流为Imin=0+r+R＝5500＝0.01则内电阻r和电阻R0上消耗的热功率之和最小值为Pmin=max2(R0+r)＝0.012×100=0.01W答：（1）可变电阻上消耗热功率最大的条件是R为100Ω，最大热功率是0.0625W；（2）电池的内电阻r和电阻R0上消耗的热功率之和的最小值是0.01W．
为您推荐：
（1）当电源的内电阻和外电阻相等的时候，电源的输出功率最大．可将R0是看成电源的内阻，当等效电源的内阻等于R时，R的功率最大，再由功率公式求解最大功率．（2）r和R0为定值电阻，R为可变电阻，根据P=I2R0可以分析电阻r和R0的功率之和，当R最大时，电路中电流最小，所求功率最小．
本题考点：
电功、电功率．
考点点评：
对于R的功率的分析是本题的难点，通常的分析方法都是把R0和电源看做一个整体来分析电源的输出功率的变化情况，即为R的功率的情况．
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