book

Raspberry Pi Hardware Reference

by Warren W. Gay

November 2014

Beginner to intermediate

248 pages

4h 40m

English

Apress

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ModelsHardware in CommonWhich Model?
Calculating PowerCurrent RequirementPeripheral PowerModel B Input PowerModel A Input Power3.3 Volt PowerPowered USB HubsPower AdaptersAn Unsuitable SupplyE-book AdaptersBest Power SourceVoltage TestBattery PowerRequirementsHeadroomLM7805 RegulationDC-DC Buck ConverterSigns of Insufficient PowerNo Power
Status LEDsOK or ACT LEDPWR LEDFDX LEDLNK LED10M or 10/100 LEDHeader P1Safe ModeLogic LevelsGPIO Configuration at Reset1-Wire DriverHeader P5Reset
/proc/meminfoMemTotalMemFreeBuffersCachedSwapCachedActiveInactiveActive(anon)Inactive(anon)Active(file)Inactive(file)UnevictableMlockedSwapTotalSwapFreeDirtyWritebackAnonPagesMappedShmemSlabSReclaimableSUnreclaimKernelStackPageTablesNFS_UnstableBounceWritebackTmpCommitLimitCommitted_ASVmallocTotalVmallocUsedVmallocChunkPhysical MemoryMemory MappingAddressLengthProtectionFlagsFile DescriptorOffsetReturn ValueVolatileVirtual MemoryFinal Thoughts on SDRAM
IdentificationOverclockingExecutionThreadspthread Headerspthread Error Handlingpthread_create(3)pthread_attr_tpthread_join(3)pthread_detach(3)pthread_self(3)pthread_kill(3)Mutexespthread_mutex_create(3)pthread_mutex_destroy(3)pthread_mutex_lock(3)pthread_mutex_unlock(3)Condition Variablespthread_cond_init(3)pthread_cond_destroy(3)pthread_cond_wait(3)pthread_cond_signal(3)pthread_cond_broadcast(3)
PowerPowered HubsUSB API SupportlibusbInclude Files
Wired Ethernet/etc/network/interfacesChanging to Static IPTest Static IP AddressUSB Adapters/etc/hosts FileWireless EthernetConfiguration
SD Card MediaSD Card InterfaceSD Card BasicsRaspbian Block SizeDisk CacheCapacities and PerformanceTransfer ModesSPI Bus Mode1-bit SD Mode4-bit SD ModeWear Leveling
RS-232 ConverterDTE or DCERS-232Start BitData BitsParity BitStop Bit(s)Baud RateBreakFlow ControlRaspberry Pi UARTsARM PL011 UARTRTS/CTS AccessPL011 UART FeaturesExclusive Serial Line UseProcedureVerificationSerial APIHeader Filesopen(2)struct termiostcgetattr(3)tcsetattr(3)tcsendbreak(3)tcdrain(3)tcflush(3)tcflow(3)cfmakeraw(3)cfgetispeed(3)cfgetospeed(3)cfsetispeed(3)cfsetospeed(3)cfsetspeed(3)read(2)write(2)readv(2) and writev(2)Error EINTR
Pins and DesignationsConfiguration After ResetPull-up ResistorsConfiguring Pull-up ResistorsTesting Pull-up StateLogic LevelsDrive StrengthInput PinsOutput PinsDriving Bi-color LEDsTesting Drive StrengthGPIO Current BudgetConfigurationAlternate Function SelectOutput PinsInput PinsAlternate FunctionSysfs GPIO AccessexportunexportgpioXChip LevelGPIO TesterGPIO Input TestFloating PotentialsReading EventsTest RunDirect Register Accessgpio_init()gpio_config()gpio_write()gpio_read()gpio_io.cGPIO Transistor DriverDriver DesignSubstitutionInductive LoadsDriver SummaryUtility gpioDisplaying GPIO SettingsReading GPIOWriting GPIOModify Drive Levels
1-Wire Line and PowerLine DrivingMaster and SlaveProtocolResetData I/OSlave SupportReading TemperatureBus MasterSlave DevicesReading the Temperature1-Wire GPIO Pin
I2C OverviewSDA and SCLMultimaster and ArbitrationBus SignalingData BitsMessage FormatsWhich I2C Bus?I2C Bus SpeedToolsI2C APIKernel Module SupportHeader Filesopen(2)ioctl(2,I2C_FUNC)ioctl(2,I2C_RDWR)
SPI BasicsSPI ModeSignalingSlave SelectionDriver SupportSPI APIOpen DeviceSPI Mode MacrosBits per WordClock RateData I/OCloseWriteReadSPI Testing
Ohm’s LawPowerUnits