Provided by: libbcm2835-dev_1.71+ds-1_amd64 
NAME
constants - Constants for passing to and from library functions
SYNOPSIS
Macros
#define HIGH 0x1
#define LOW 0x0
#define MIN(a, b) (a < b ? a : b)
#define BCM2835_CORE_CLK_HZ 250000000
#define BMC2835_RPI2_DT_FILENAME '/proc/device-tree/soc/ranges'
#define BCM2835_PERI_BASE 0x20000000
#define BCM2835_PERI_SIZE 0x01000000
#define BCM2835_RPI2_PERI_BASE 0x3F000000
#define BCM2835_RPI4_PERI_BASE 0xFE000000
#define BCM2835_RPI4_PERI_SIZE 0x01800000
#define BCM2835_ST_BASE 0x3000
#define BCM2835_GPIO_PADS 0x100000
#define BCM2835_CLOCK_BASE 0x101000
#define BCM2835_GPIO_BASE 0x200000
#define BCM2835_SPI0_BASE 0x204000
#define BCM2835_BSC0_BASE 0x205000
#define BCM2835_GPIO_PWM 0x20C000
#define BCM2835_AUX_BASE 0x215000
#define BCM2835_SPI1_BASE 0x215080
#define BCM2835_SPI2_BASE 0x2150C0
#define BCM2835_BSC1_BASE 0x804000
#define BCM2835_SMI_BASE 0x600000
#define BCM2835_PAGE_SIZE (4*1024)
#define BCM2835_BLOCK_SIZE (4*1024)
#define BCM2835_GPFSEL0 0x0000
#define BCM2835_GPFSEL1 0x0004
#define BCM2835_GPFSEL2 0x0008
#define BCM2835_GPFSEL3 0x000c
#define BCM2835_GPFSEL4 0x0010
#define BCM2835_GPFSEL5 0x0014
#define BCM2835_GPSET0 0x001c
#define BCM2835_GPSET1 0x0020
#define BCM2835_GPCLR0 0x0028
#define BCM2835_GPCLR1 0x002c
#define BCM2835_GPLEV0 0x0034
#define BCM2835_GPLEV1 0x0038
#define BCM2835_GPEDS0 0x0040
#define BCM2835_GPEDS1 0x0044
#define BCM2835_GPREN0 0x004c
#define BCM2835_GPREN1 0x0050
#define BCM2835_GPFEN0 0x0058
#define BCM2835_GPFEN1 0x005c
#define BCM2835_GPHEN0 0x0064
#define BCM2835_GPHEN1 0x0068
#define BCM2835_GPLEN0 0x0070
#define BCM2835_GPLEN1 0x0074
#define BCM2835_GPAREN0 0x007c
#define BCM2835_GPAREN1 0x0080
#define BCM2835_GPAFEN0 0x0088
#define BCM2835_GPAFEN1 0x008c
#define BCM2835_GPPUD 0x0094
#define BCM2835_GPPUDCLK0 0x0098
#define BCM2835_GPPUDCLK1 0x009c
#define BCM2835_GPPUPPDN0 0x00e4 /* Pin pull-up/down for pins 15:0 */
#define BCM2835_GPPUPPDN1 0x00e8 /* Pin pull-up/down for pins 31:16 */
#define BCM2835_GPPUPPDN2 0x00ec /* Pin pull-up/down for pins 47:32 */
#define BCM2835_GPPUPPDN3 0x00f0 /* Pin pull-up/down for pins 57:48 */
#define BCM2835_GPIO_PUD_ERROR 0x08
#define BCM2835_PADS_GPIO_0_27 0x002c
#define BCM2835_PADS_GPIO_28_45 0x0030
#define BCM2835_PADS_GPIO_46_53 0x0034
#define BCM2835_PAD_PASSWRD (0x5A << 24)
#define BCM2835_PAD_SLEW_RATE_UNLIMITED 0x10
#define BCM2835_PAD_HYSTERESIS_ENABLED 0x08
#define BCM2835_PAD_DRIVE_2mA 0x00
#define BCM2835_PAD_DRIVE_4mA 0x01
#define BCM2835_PAD_DRIVE_6mA 0x02
#define BCM2835_PAD_DRIVE_8mA 0x03
#define BCM2835_PAD_DRIVE_10mA 0x04
#define BCM2835_PAD_DRIVE_12mA 0x05
#define BCM2835_PAD_DRIVE_14mA 0x06
#define BCM2835_PAD_DRIVE_16mA 0x07
#define BCM2835_AUX_IRQ 0x0000
#define BCM2835_AUX_ENABLE 0x0004
#define BCM2835_AUX_ENABLE_UART1 0x01
#define BCM2835_AUX_ENABLE_SPI0 0x02
#define BCM2835_AUX_ENABLE_SPI1 0x04
#define BCM2835_AUX_SPI_CNTL0 0x0000
#define BCM2835_AUX_SPI_CNTL1 0x0004
#define BCM2835_AUX_SPI_STAT 0x0008
#define BCM2835_AUX_SPI_PEEK 0x000C
#define BCM2835_AUX_SPI_IO 0x0020
#define BCM2835_AUX_SPI_TXHOLD 0x0030
#define BCM2835_AUX_SPI_CLOCK_MIN 30500
#define BCM2835_AUX_SPI_CLOCK_MAX 125000000
#define BCM2835_AUX_SPI_CNTL0_SPEED 0xFFF00000
#define BCM2835_AUX_SPI_CNTL0_SPEED_MAX 0xFFF
#define BCM2835_AUX_SPI_CNTL0_SPEED_SHIFT 20
#define BCM2835_AUX_SPI_CNTL0_CS0_N 0x000C0000
#define BCM2835_AUX_SPI_CNTL0_CS1_N 0x000A0000
#define BCM2835_AUX_SPI_CNTL0_CS2_N 0x00060000
#define BCM2835_AUX_SPI_CNTL0_POSTINPUT 0x00010000
#define BCM2835_AUX_SPI_CNTL0_VAR_CS 0x00008000
#define BCM2835_AUX_SPI_CNTL0_VAR_WIDTH 0x00004000
#define BCM2835_AUX_SPI_CNTL0_DOUTHOLD 0x00003000
#define BCM2835_AUX_SPI_CNTL0_ENABLE 0x00000800
#define BCM2835_AUX_SPI_CNTL0_CPHA_IN 0x00000400
#define BCM2835_AUX_SPI_CNTL0_CLEARFIFO 0x00000200
#define BCM2835_AUX_SPI_CNTL0_CPHA_OUT 0x00000100
#define BCM2835_AUX_SPI_CNTL0_CPOL 0x00000080
#define BCM2835_AUX_SPI_CNTL0_MSBF_OUT 0x00000040
#define BCM2835_AUX_SPI_CNTL0_SHIFTLEN 0x0000003F
#define BCM2835_AUX_SPI_CNTL1_CSHIGH 0x00000700
#define BCM2835_AUX_SPI_CNTL1_IDLE 0x00000080
#define BCM2835_AUX_SPI_CNTL1_TXEMPTY 0x00000040
#define BCM2835_AUX_SPI_CNTL1_MSBF_IN 0x00000002
#define BCM2835_AUX_SPI_CNTL1_KEEP_IN 0x00000001
#define BCM2835_AUX_SPI_STAT_TX_LVL 0xF0000000
#define BCM2835_AUX_SPI_STAT_RX_LVL 0x00F00000
#define BCM2835_AUX_SPI_STAT_TX_FULL 0x00000400
#define BCM2835_AUX_SPI_STAT_TX_EMPTY 0x00000200
#define BCM2835_AUX_SPI_STAT_RX_FULL 0x00000100
#define BCM2835_AUX_SPI_STAT_RX_EMPTY 0x00000080
#define BCM2835_AUX_SPI_STAT_BUSY 0x00000040
#define BCM2835_AUX_SPI_STAT_BITCOUNT 0x0000003F
#define BCM2835_SPI0_CS 0x0000
#define BCM2835_SPI0_FIFO 0x0004
#define BCM2835_SPI0_CLK 0x0008
#define BCM2835_SPI0_DLEN 0x000c
#define BCM2835_SPI0_LTOH 0x0010
#define BCM2835_SPI0_DC 0x0014
#define BCM2835_SPI0_CS_LEN_LONG 0x02000000
#define BCM2835_SPI0_CS_DMA_LEN 0x01000000
#define BCM2835_SPI0_CS_CSPOL2 0x00800000
#define BCM2835_SPI0_CS_CSPOL1 0x00400000
#define BCM2835_SPI0_CS_CSPOL0 0x00200000
#define BCM2835_SPI0_CS_RXF 0x00100000
#define BCM2835_SPI0_CS_RXR 0x00080000
#define BCM2835_SPI0_CS_TXD 0x00040000
#define BCM2835_SPI0_CS_RXD 0x00020000
#define BCM2835_SPI0_CS_DONE 0x00010000
#define BCM2835_SPI0_CS_TE_EN 0x00008000
#define BCM2835_SPI0_CS_LMONO 0x00004000
#define BCM2835_SPI0_CS_LEN 0x00002000
#define BCM2835_SPI0_CS_REN 0x00001000
#define BCM2835_SPI0_CS_ADCS 0x00000800
#define BCM2835_SPI0_CS_INTR 0x00000400
#define BCM2835_SPI0_CS_INTD 0x00000200
#define BCM2835_SPI0_CS_DMAEN 0x00000100
#define BCM2835_SPI0_CS_TA 0x00000080
#define BCM2835_SPI0_CS_CSPOL 0x00000040
#define BCM2835_SPI0_CS_CLEAR 0x00000030
#define BCM2835_SPI0_CS_CLEAR_RX 0x00000020
#define BCM2835_SPI0_CS_CLEAR_TX 0x00000010
#define BCM2835_SPI0_CS_CPOL 0x00000008
#define BCM2835_SPI0_CS_CPHA 0x00000004
#define BCM2835_SPI0_CS_CS 0x00000003
#define BCM2835_BSC_C 0x0000
#define BCM2835_BSC_S 0x0004
#define BCM2835_BSC_DLEN 0x0008
#define BCM2835_BSC_A 0x000c
#define BCM2835_BSC_FIFO 0x0010
#define BCM2835_BSC_DIV 0x0014
#define BCM2835_BSC_DEL 0x0018
#define BCM2835_BSC_CLKT 0x001c
#define BCM2835_BSC_C_I2CEN 0x00008000
#define BCM2835_BSC_C_INTR 0x00000400
#define BCM2835_BSC_C_INTT 0x00000200
#define BCM2835_BSC_C_INTD 0x00000100
#define BCM2835_BSC_C_ST 0x00000080
#define BCM2835_BSC_C_CLEAR_1 0x00000020
#define BCM2835_BSC_C_CLEAR_2 0x00000010
#define BCM2835_BSC_C_READ 0x00000001
#define BCM2835_BSC_S_CLKT 0x00000200
#define BCM2835_BSC_S_ERR 0x00000100
#define BCM2835_BSC_S_RXF 0x00000080
#define BCM2835_BSC_S_TXE 0x00000040
#define BCM2835_BSC_S_RXD 0x00000020
#define BCM2835_BSC_S_TXD 0x00000010
#define BCM2835_BSC_S_RXR 0x00000008
#define BCM2835_BSC_S_TXW 0x00000004
#define BCM2835_BSC_S_DONE 0x00000002
#define BCM2835_BSC_S_TA 0x00000001
#define BCM2835_BSC_FIFO_SIZE 16
#define BCM2835_SMI_CS 0 /*! < Control and status register > */
#define BCM2835_SMI_LENGTH 1 /*! < Transfer length register > */
#define BCM2835_SMI_ADRS 2 /*! < Transfer address register > */
#define BCM2835_SMI_DATA 3 /*! < Transfer data register > */
#define BCM2835_SMI_READ0 4 /*! < Read settings 0 register > */
#define BCM2835_SMI_WRITE0 5 /*! < Write settings 0 register > */
#define BCM2835_SMI_READ1 6 /*! < Read settings 1 register > */
#define BCM2835_SMI_WRITE1 7 /*! < Write settings 1 register > */
#define BCM2835_SMI_READ2 8 /*! < Read settings 2 register > */
#define BCM2835_SMI_WRITE2 9 /*! < Write settings 2 register > */
#define BCM2835_SMI_READ3 10 /*! < Read settings 3 register > */
#define BCM2835_SMI_WRITE3 11 /*! < Write settings 3 register > */
#define BCM2835_SMI_DMAC 12 /*! < DMA control register > */
#define BCM2835_SMI_DIRCS 13 /*! < Direct control register > */
#define BCM2835_SMI_DIRADDR 14 /*! < Direct access address register > */
#define BCM2835_SMI_DIRDATA 15 /*! < Direct access data register > */
#define BCM2835_SMI_RW_WIDTH_MSK 0xC0000000 /*! < Data width mask > */
#define BCM2835_SMI_RW_WID8 0x00000000 /*! < Data width 8 bits > */
#define BCM2835_SMI_RW_WID16 0x40000000 /*! < Data width 16 bits > */
#define BCM2835_SMI_RW_WID18 0x80000000 /*! < Data width 18 bits > */
#define BCM2835_SMI_RW_WID9 0xC0000000 /*! < Data width 9 bits > */
#define BCM2835_SMI_RW_SETUP_MSK 0x3F000000 /*! < Setup cycles (6 bits) > */
#define BCM2835_SMI_RW_SETUP_LS 24 /*! < Shift for setup cycles > */
#define BCM2835_SMI_RW_MODE68 0x00800000 /*! < Run cycle motorola mode > */
#define BCM2835_SMI_RW_MODE80 0x00000000 /*! < Run cycle intel mode > */
#define BCM2835_SMI_READ_FSETUP 0x00400000 /*! < Read : Setup only for first cycle > */
#define BCM2835_SMI_WRITE_SWAP 0x00400000 /*! < Write : swap pixel data > */
#define BCM2835_SMI_RW_HOLD_MSK 0x003F0000 /*! < Hold cycles (6 bits) > */
#define BCM2835_SMI_RW_HOLD_LS 16 /*! < Shift for hold cycles > */
#define BCM2835_SMI_RW_PACEALL 0x00008000 /*! < Apply pacing always > */
#define BCM2835_SMI_RW_PACE_MSK 0x00007F00 /*! < Pace cycles (7 bits) > */
#define BCM2835_SMI_RW_PACE_LS 8 /*! < Shift for pace cycles > */
#define BCM2835_SMI_RW_DREQ 0x00000080 /*! < Use DMA req on read/write > */
#define BCM2835_SMI_RW_STROBE_MSK 0x0000007F /*! < Strobe cycles (7 bits) > */
#define BCM2835_SMI_RW_STROBE_LS 0 /*! < Shift for strobe cycles > */
#define BCM2835_SMI_DIRCS_ENABLE 0x00000001 /*! < Set to enable SMI. 0 = Read from ext.
devices > */
#define BCM2835_SMI_DIRCS_START 0x00000002 /*! < Initiate SMI transfer > */
#define BCM2835_SMI_DIRCS_DONE 0x00000004 /*! < Set if transfer has finished / Write to
clear flag > */
#define BCM2835_SMI_DIRCS_WRITE 0x00000008 /*! < 1 = Write to ext. devices > */
#define BCM2835_SMI_DIRADRS_DEV_MSK 0x00000300 /*! < Timing configuration slot > */
#define BCM2835_SMI_DIRADRS_DEV_LS 8 /*! < Shift for configuration slot > */
#define BCM2835_SMI_DIRADRS_DEV0 0x00000000 /*! < Use timing config slot 0 > */
#define BCM2835_SMI_DIRADRS_DEV1 0x00000100 /*! < Use timing config slot 1 > */
#define BCM2835_SMI_DIRADRS_DEV2 0x00000200 /*! < Use timing config slot 2 > */
#define BCM2835_SMI_DIRADRS_DEV3 0x00000300 /*! < Use timing config slot 3 > */
#define BCM2835_SMI_DIRADRS_MSK 0x0000003F /*! < Adress bits SA5..SA0 > */
#define BCM2835_SMI_DIRADRS_LS 0 /*! < Shift for address bits > */
#define SMICLK_CNTL (44) /* = 0xB0 */
#define SMICLK_DIV (45) /* = 0xB4 */
#define BCM2835_ST_CS 0x0000
#define BCM2835_ST_CLO 0x0004
#define BCM2835_ST_CHI 0x0008
Enumerations
enum bcm2835RegisterBase { BCM2835_REGBASE_ST = 1, BCM2835_REGBASE_GPIO = 2,
BCM2835_REGBASE_PWM = 3, BCM2835_REGBASE_CLK = 4, BCM2835_REGBASE_PADS = 5,
BCM2835_REGBASE_SPI0 = 6, BCM2835_REGBASE_BSC0 = 7, BCM2835_REGBASE_BSC1 = 8,
BCM2835_REGBASE_AUX = 9, BCM2835_REGBASE_SPI1 = 10, BCM2835_REGBASE_SMI = 11 }
bcm2835RegisterBase Register bases for bcm2835_regbase()
enum bcm2835FunctionSelect { BCM2835_GPIO_FSEL_INPT = 0x00, BCM2835_GPIO_FSEL_OUTP = 0x01,
BCM2835_GPIO_FSEL_ALT0 = 0x04, BCM2835_GPIO_FSEL_ALT1 = 0x05, BCM2835_GPIO_FSEL_ALT2 =
0x06, BCM2835_GPIO_FSEL_ALT3 = 0x07, BCM2835_GPIO_FSEL_ALT4 = 0x03,
BCM2835_GPIO_FSEL_ALT5 = 0x02, BCM2835_GPIO_FSEL_MASK = 0x07 }
bcm2835PortFunction Port function select modes for bcm2835_gpio_fsel()
enum bcm2835PUDControl { BCM2835_GPIO_PUD_OFF = 0x00, BCM2835_GPIO_PUD_DOWN = 0x01,
BCM2835_GPIO_PUD_UP = 0x02 }
bcm2835PUDControl Pullup/Pulldown defines for bcm2835_gpio_pud()
enum bcm2835PadGroup { BCM2835_PAD_GROUP_GPIO_0_27 = 0, BCM2835_PAD_GROUP_GPIO_28_45 = 1,
BCM2835_PAD_GROUP_GPIO_46_53 = 2 }
bcm2835PadGroup Pad group specification for bcm2835_gpio_pad()
enum RPiGPIOPin { RPI_GPIO_P1_03 = 0, RPI_GPIO_P1_05 = 1, RPI_GPIO_P1_07 = 4,
RPI_GPIO_P1_08 = 14, RPI_GPIO_P1_10 = 15, RPI_GPIO_P1_11 = 17, RPI_GPIO_P1_12 = 18,
RPI_GPIO_P1_13 = 21, RPI_GPIO_P1_15 = 22, RPI_GPIO_P1_16 = 23, RPI_GPIO_P1_18 = 24,
RPI_GPIO_P1_19 = 10, RPI_GPIO_P1_21 = 9, RPI_GPIO_P1_22 = 25, RPI_GPIO_P1_23 = 11,
RPI_GPIO_P1_24 = 8, RPI_GPIO_P1_26 = 7, RPI_V2_GPIO_P1_03 = 2, RPI_V2_GPIO_P1_05 = 3,
RPI_V2_GPIO_P1_07 = 4, RPI_V2_GPIO_P1_08 = 14, RPI_V2_GPIO_P1_10 = 15,
RPI_V2_GPIO_P1_11 = 17, RPI_V2_GPIO_P1_12 = 18, RPI_V2_GPIO_P1_13 = 27,
RPI_V2_GPIO_P1_15 = 22, RPI_V2_GPIO_P1_16 = 23, RPI_V2_GPIO_P1_18 = 24,
RPI_V2_GPIO_P1_19 = 10, RPI_V2_GPIO_P1_21 = 9, RPI_V2_GPIO_P1_22 = 25,
RPI_V2_GPIO_P1_23 = 11, RPI_V2_GPIO_P1_24 = 8, RPI_V2_GPIO_P1_26 = 7,
RPI_V2_GPIO_P1_29 = 5, RPI_V2_GPIO_P1_31 = 6, RPI_V2_GPIO_P1_32 = 12,
RPI_V2_GPIO_P1_33 = 13, RPI_V2_GPIO_P1_35 = 19, RPI_V2_GPIO_P1_36 = 16,
RPI_V2_GPIO_P1_37 = 26, RPI_V2_GPIO_P1_38 = 20, RPI_V2_GPIO_P1_40 = 21,
RPI_V2_GPIO_P5_03 = 28, RPI_V2_GPIO_P5_04 = 29, RPI_V2_GPIO_P5_05 = 30,
RPI_V2_GPIO_P5_06 = 31, RPI_BPLUS_GPIO_J8_03 = 2, RPI_BPLUS_GPIO_J8_05 = 3,
RPI_BPLUS_GPIO_J8_07 = 4, RPI_BPLUS_GPIO_J8_08 = 14, RPI_BPLUS_GPIO_J8_10 = 15,
RPI_BPLUS_GPIO_J8_11 = 17, RPI_BPLUS_GPIO_J8_12 = 18, RPI_BPLUS_GPIO_J8_13 = 27,
RPI_BPLUS_GPIO_J8_15 = 22, RPI_BPLUS_GPIO_J8_16 = 23, RPI_BPLUS_GPIO_J8_18 = 24,
RPI_BPLUS_GPIO_J8_19 = 10, RPI_BPLUS_GPIO_J8_21 = 9, RPI_BPLUS_GPIO_J8_22 = 25,
RPI_BPLUS_GPIO_J8_23 = 11, RPI_BPLUS_GPIO_J8_24 = 8, RPI_BPLUS_GPIO_J8_26 = 7,
RPI_BPLUS_GPIO_J8_29 = 5, RPI_BPLUS_GPIO_J8_31 = 6, RPI_BPLUS_GPIO_J8_32 = 12,
RPI_BPLUS_GPIO_J8_33 = 13, RPI_BPLUS_GPIO_J8_35 = 19, RPI_BPLUS_GPIO_J8_36 = 16,
RPI_BPLUS_GPIO_J8_37 = 26, RPI_BPLUS_GPIO_J8_38 = 20, RPI_BPLUS_GPIO_J8_40 = 21 }
GPIO Pin Numbers.
enum bcm2835SPIBitOrder { BCM2835_SPI_BIT_ORDER_LSBFIRST = 0,
BCM2835_SPI_BIT_ORDER_MSBFIRST = 1 }
bcm2835SPIBitOrder SPI Bit order Specifies the SPI data bit ordering for
bcm2835_spi_setBitOrder()
enum bcm2835SPIMode { BCM2835_SPI_MODE0 = 0, BCM2835_SPI_MODE1 = 1, BCM2835_SPI_MODE2 = 2,
BCM2835_SPI_MODE3 = 3 }
SPI Data mode Specify the SPI data mode to be passed to bcm2835_spi_setDataMode()
enum bcm2835SPIChipSelect { BCM2835_SPI_CS0 = 0, BCM2835_SPI_CS1 = 1, BCM2835_SPI_CS2 = 2,
BCM2835_SPI_CS_NONE = 3 }
bcm2835SPIChipSelect Specify the SPI chip select pin(s)
enum bcm2835SPIClockDivider { BCM2835_SPI_CLOCK_DIVIDER_65536 = 0,
BCM2835_SPI_CLOCK_DIVIDER_32768 = 32768, BCM2835_SPI_CLOCK_DIVIDER_16384 = 16384,
BCM2835_SPI_CLOCK_DIVIDER_8192 = 8192, BCM2835_SPI_CLOCK_DIVIDER_4096 = 4096,
BCM2835_SPI_CLOCK_DIVIDER_2048 = 2048, BCM2835_SPI_CLOCK_DIVIDER_1024 = 1024,
BCM2835_SPI_CLOCK_DIVIDER_512 = 512, BCM2835_SPI_CLOCK_DIVIDER_256 = 256,
BCM2835_SPI_CLOCK_DIVIDER_128 = 128, BCM2835_SPI_CLOCK_DIVIDER_64 = 64,
BCM2835_SPI_CLOCK_DIVIDER_32 = 32, BCM2835_SPI_CLOCK_DIVIDER_16 = 16,
BCM2835_SPI_CLOCK_DIVIDER_8 = 8, BCM2835_SPI_CLOCK_DIVIDER_4 = 4,
BCM2835_SPI_CLOCK_DIVIDER_2 = 2, BCM2835_SPI_CLOCK_DIVIDER_1 = 1 }
bcm2835SPIClockDivider Specifies the divider used to generate the SPI clock from the
system clock. Figures below give the divider, clock period and clock frequency. Clock
divided is based on nominal core clock rate of 250MHz on RPi1 and RPi2, and 400MHz on
RPi3. It is reported that (contrary to the documentation) any even divider may used.
The frequencies shown for each divider have been confirmed by measurement on RPi1 and
RPi2. The system clock frequency on RPi3 is different, so the frequency you get from a
given divider will be different. See comments in 'SPI Pins' for information about
reliable SPI speeds. Note: it is possible to change the core clock rate of the RPi 3
back to 250MHz, by putting
enum bcm2835I2CClockDivider { BCM2835_I2C_CLOCK_DIVIDER_2500 = 2500,
BCM2835_I2C_CLOCK_DIVIDER_626 = 626, BCM2835_I2C_CLOCK_DIVIDER_150 = 150,
BCM2835_I2C_CLOCK_DIVIDER_148 = 148 }
bcm2835I2CClockDivider Specifies the divider used to generate the I2C clock from the
system clock. Clock divided is based on nominal base clock rate of 250MHz
enum bcm2835I2CReasonCodes { BCM2835_I2C_REASON_OK = 0x00, BCM2835_I2C_REASON_ERROR_NACK =
0x01, BCM2835_I2C_REASON_ERROR_CLKT = 0x02, BCM2835_I2C_REASON_ERROR_DATA = 0x04 }
bcm2835I2CReasonCodes Specifies the reason codes for the bcm2835_i2c_write and
bcm2835_i2c_read functions.
Variables
off_t bcm2835_peripherals_base
size_t bcm2835_peripherals_size
uint32_t * bcm2835_peripherals
volatile uint32_t * bcm2835_st
volatile uint32_t * bcm2835_gpio
volatile uint32_t * bcm2835_pwm
volatile uint32_t * bcm2835_clk
volatile uint32_t * bcm2835_pads
volatile uint32_t * bcm2835_spi0
volatile uint32_t * bcm2835_bsc0
volatile uint32_t * bcm2835_bsc1
volatile uint32_t * bcm2835_aux
volatile uint32_t * bcm2835_spi1
volatile uint32_t * bcm2835_smi
Detailed Description
The values here are designed to be passed to various functions in the bcm2835 library.
Macro Definition Documentation
#define BCM2835_AUX_BASE 0x215000
Base Address of the AUX registers
#define BCM2835_AUX_ENABLE_SPI0 0x02
SPI0 (SPI1 in the device)
#define BCM2835_AUX_ENABLE_SPI1 0x04
SPI1 (SPI2 in the device)
#define BCM2835_AUX_IRQ 0x0000
xxx
#define BCM2835_AUX_SPI_CLOCK_MAX 125000000
125Mhz
#define BCM2835_AUX_SPI_CLOCK_MIN 30500
30,5kHz
#define BCM2835_AUX_SPI_CNTL0_CS0_N 0x000C0000
CS 0 low
#define BCM2835_AUX_SPI_CNTL0_CS1_N 0x000A0000
CS 1 low
#define BCM2835_AUX_SPI_CNTL0_CS2_N 0x00060000
CS 2 low
#define BCM2835_AUX_SPI_IO 0x0020
Write = TX, read=RX
#define BCM2835_AUX_SPI_PEEK 0x000C
Read but do not take from FF
#define BCM2835_AUX_SPI_TXHOLD 0x0030
Write = TX keep CS, read=RX
#define BCM2835_BLOCK_SIZE (4*1024)
Size of memory block on RPi
#define BCM2835_BSC0_BASE 0x205000
Base Address of the BSC0 registers
#define BCM2835_BSC1_BASE 0x804000
Base Address of the BSC1 registers
#define BCM2835_BSC_A 0x000c
BSC Master Slave Address
#define BCM2835_BSC_C 0x0000
BSC Master Control
#define BCM2835_BSC_C_CLEAR_1 0x00000020
Clear FIFO Clear
#define BCM2835_BSC_C_CLEAR_2 0x00000010
Clear FIFO Clear
#define BCM2835_BSC_C_I2CEN 0x00008000
I2C Enable, 0 = disabled, 1 = enabled
#define BCM2835_BSC_C_INTD 0x00000100
Interrupt on DONE
#define BCM2835_BSC_C_INTR 0x00000400
Interrupt on RX
#define BCM2835_BSC_C_INTT 0x00000200
Interrupt on TX
#define BCM2835_BSC_C_READ 0x00000001
Read transfer
#define BCM2835_BSC_C_ST 0x00000080
Start transfer, 1 = Start a new transfer
#define BCM2835_BSC_CLKT 0x001c
BSC Master Clock Stretch Timeout
#define BCM2835_BSC_DEL 0x0018
BSC Master Data Delay
#define BCM2835_BSC_DIV 0x0014
BSC Master Clock Divider
#define BCM2835_BSC_DLEN 0x0008
BSC Master Data Length
#define BCM2835_BSC_FIFO 0x0010
BSC Master Data FIFO
#define BCM2835_BSC_FIFO_SIZE 16
BSC FIFO size
#define BCM2835_BSC_S 0x0004
BSC Master Status
#define BCM2835_BSC_S_CLKT 0x00000200
Clock stretch timeout
#define BCM2835_BSC_S_DONE 0x00000002
Transfer DONE
#define BCM2835_BSC_S_ERR 0x00000100
ACK error
#define BCM2835_BSC_S_RXD 0x00000020
RXD FIFO contains data
#define BCM2835_BSC_S_RXF 0x00000080
RXF FIFO full, 0 = FIFO is not full, 1 = FIFO is full
#define BCM2835_BSC_S_RXR 0x00000008
RXR FIFO needs reading (full)
#define BCM2835_BSC_S_TA 0x00000001
Transfer Active
#define BCM2835_BSC_S_TXD 0x00000010
TXD FIFO can accept data
#define BCM2835_BSC_S_TXE 0x00000040
TXE FIFO full, 0 = FIFO is not full, 1 = FIFO is full
#define BCM2835_BSC_S_TXW 0x00000004
TXW FIFO needs writing (full)
#define BCM2835_CLOCK_BASE 0x101000
Base Address of the Clock/timer registers
#define BCM2835_CORE_CLK_HZ 250000000
Speed of the core clock core_clk 250 MHz
#define BCM2835_GPAFEN0 0x0088
GPIO Pin Async. Falling Edge Detect 0
#define BCM2835_GPAFEN1 0x008c
GPIO Pin Async. Falling Edge Detect 1
#define BCM2835_GPAREN0 0x007c
GPIO Pin Async. Rising Edge Detect 0
#define BCM2835_GPAREN1 0x0080
GPIO Pin Async. Rising Edge Detect 1
#define BCM2835_GPCLR0 0x0028
GPIO Pin Output Clear 0
#define BCM2835_GPCLR1 0x002c
GPIO Pin Output Clear 1
#define BCM2835_GPEDS0 0x0040
GPIO Pin Event Detect Status 0
#define BCM2835_GPEDS1 0x0044
GPIO Pin Event Detect Status 1
#define BCM2835_GPFEN0 0x0058
GPIO Pin Falling Edge Detect Enable 0
#define BCM2835_GPFEN1 0x005c
GPIO Pin Falling Edge Detect Enable 1
#define BCM2835_GPFSEL0 0x0000
GPIO register offsets from BCM2835_GPIO_BASE. Offsets into the GPIO Peripheral block in
bytes per 6.1 Register View GPIO Function Select 0
#define BCM2835_GPFSEL1 0x0004
GPIO Function Select 1
#define BCM2835_GPFSEL2 0x0008
GPIO Function Select 2
#define BCM2835_GPFSEL3 0x000c
GPIO Function Select 3
#define BCM2835_GPFSEL4 0x0010
GPIO Function Select 4
#define BCM2835_GPFSEL5 0x0014
GPIO Function Select 5
#define BCM2835_GPHEN0 0x0064
GPIO Pin High Detect Enable 0
#define BCM2835_GPHEN1 0x0068
GPIO Pin High Detect Enable 1
#define BCM2835_GPIO_BASE 0x200000
Base Address of the GPIO registers
#define BCM2835_GPIO_PADS 0x100000
Base Address of the Pads registers
#define BCM2835_GPIO_PWM 0x20C000
Base Address of the PWM registers
#define BCM2835_GPLEN0 0x0070
GPIO Pin Low Detect Enable 0
#define BCM2835_GPLEN1 0x0074
GPIO Pin Low Detect Enable 1
#define BCM2835_GPLEV0 0x0034
GPIO Pin Level 0
#define BCM2835_GPLEV1 0x0038
GPIO Pin Level 1
#define BCM2835_GPPUD 0x0094
GPIO Pin Pull-up/down Enable
#define BCM2835_GPPUDCLK0 0x0098
GPIO Pin Pull-up/down Enable Clock 0
#define BCM2835_GPPUDCLK1 0x009c
GPIO Pin Pull-up/down Enable Clock 1
#define BCM2835_GPREN0 0x004c
GPIO Pin Rising Edge Detect Enable 0
#define BCM2835_GPREN1 0x0050
GPIO Pin Rising Edge Detect Enable 1
#define BCM2835_GPSET0 0x001c
GPIO Pin Output Set 0
#define BCM2835_GPSET1 0x0020
GPIO Pin Output Set 1
#define BCM2835_PAD_DRIVE_10mA 0x04
10mA drive current
#define BCM2835_PAD_DRIVE_12mA 0x05
12mA drive current
#define BCM2835_PAD_DRIVE_14mA 0x06
14mA drive current
#define BCM2835_PAD_DRIVE_16mA 0x07
16mA drive current
#define BCM2835_PAD_DRIVE_2mA 0x00
2mA drive current
#define BCM2835_PAD_DRIVE_4mA 0x01
4mA drive current
#define BCM2835_PAD_DRIVE_6mA 0x02
6mA drive current
#define BCM2835_PAD_DRIVE_8mA 0x03
8mA drive current
#define BCM2835_PAD_HYSTERESIS_ENABLED 0x08
Hysteresis enabled
#define BCM2835_PAD_PASSWRD (0x5A << 24)
Pad Control masks Password to enable setting pad mask
#define BCM2835_PAD_SLEW_RATE_UNLIMITED 0x10
Slew rate unlimited
#define BCM2835_PADS_GPIO_0_27 0x002c
Pad control register offsets from BCM2835_GPIO_PADS Pad control register for pads 0 to 27
#define BCM2835_PADS_GPIO_28_45 0x0030
Pad control register for pads 28 to 45
#define BCM2835_PADS_GPIO_46_53 0x0034
Pad control register for pads 46 to 53
#define BCM2835_PAGE_SIZE (4*1024)
Size of memory page on RPi
#define BCM2835_PERI_BASE 0x20000000
Physical addresses for various peripheral register sets Base Physical Address of the BCM
2835 peripheral registers Note this is different for the RPi2 BCM2836, where this is
derived from /proc/device-tree/soc/ranges If /proc/device-tree/soc/ranges exists on a RPi
1 OS, it would be expected to contain the following numbers:
Peripherals block base address on RPi 1
#define BCM2835_PERI_SIZE 0x01000000
Size of the peripherals block on RPi 1
#define BCM2835_RPI2_PERI_BASE 0x3F000000
Alternate base address for RPI 2 / 3
#define BCM2835_RPI4_PERI_BASE 0xFE000000
Alternate base address for RPI 4
#define BCM2835_RPI4_PERI_SIZE 0x01800000
Alternate size for RPI 4
#define BCM2835_SMI_BASE 0x600000
Base address of the SMI registers
#define BCM2835_SPI0_BASE 0x204000
Base Address of the SPI0 registers
#define BCM2835_SPI0_CLK 0x0008
SPI Master Clock Divider
#define BCM2835_SPI0_CS 0x0000
SPI Master Control and Status
#define BCM2835_SPI0_CS_ADCS 0x00000800
ADCS Automatically Deassert Chip Select
#define BCM2835_SPI0_CS_CLEAR 0x00000030
Clear FIFO Clear RX and TX
#define BCM2835_SPI0_CS_CLEAR_RX 0x00000020
Clear FIFO Clear RX
#define BCM2835_SPI0_CS_CLEAR_TX 0x00000010
Clear FIFO Clear TX
#define BCM2835_SPI0_CS_CPHA 0x00000004
Clock Phase
#define BCM2835_SPI0_CS_CPOL 0x00000008
Clock Polarity
#define BCM2835_SPI0_CS_CS 0x00000003
Chip Select
#define BCM2835_SPI0_CS_CSPOL 0x00000040
Chip Select Polarity
#define BCM2835_SPI0_CS_CSPOL0 0x00200000
Chip Select 0 Polarity
#define BCM2835_SPI0_CS_CSPOL1 0x00400000
Chip Select 1 Polarity
#define BCM2835_SPI0_CS_CSPOL2 0x00800000
Chip Select 2 Polarity
#define BCM2835_SPI0_CS_DMA_LEN 0x01000000
Enable DMA mode in Lossi mode
#define BCM2835_SPI0_CS_DMAEN 0x00000100
DMAEN DMA Enable
#define BCM2835_SPI0_CS_DONE 0x00010000
Done transfer Done
#define BCM2835_SPI0_CS_INTD 0x00000200
INTD Interrupt on Done
#define BCM2835_SPI0_CS_INTR 0x00000400
INTR Interrupt on RXR
#define BCM2835_SPI0_CS_LEN 0x00002000
LEN LoSSI enable
#define BCM2835_SPI0_CS_LEN_LONG 0x02000000
Enable Long data word in Lossi mode if DMA_LEN is set
#define BCM2835_SPI0_CS_LMONO 0x00004000
Unused
#define BCM2835_SPI0_CS_REN 0x00001000
REN Read Enable
#define BCM2835_SPI0_CS_RXD 0x00020000
RXD RX FIFO contains Data
#define BCM2835_SPI0_CS_RXF 0x00100000
RXF - RX FIFO Full
#define BCM2835_SPI0_CS_RXR 0x00080000
RXR RX FIFO needs Reading (full)
#define BCM2835_SPI0_CS_TA 0x00000080
Transfer Active
#define BCM2835_SPI0_CS_TE_EN 0x00008000
Unused
#define BCM2835_SPI0_CS_TXD 0x00040000
TXD TX FIFO can accept Data
#define BCM2835_SPI0_DC 0x0014
SPI DMA DREQ Controls
#define BCM2835_SPI0_DLEN 0x000c
SPI Master Data Length
#define BCM2835_SPI0_FIFO 0x0004
SPI Master TX and RX FIFOs
#define BCM2835_SPI0_LTOH 0x0010
SPI LOSSI mode TOH
#define BCM2835_SPI1_BASE 0x215080
Base Address of the AUX_SPI1 registers
#define BCM2835_SPI2_BASE 0x2150C0
Base Address of the AUX_SPI2 registers
#define BCM2835_ST_BASE 0x3000
Offsets for the bases of various peripherals within the peripherals block / Base Address
of the System Timer registers
#define BCM2835_ST_CHI 0x0008
System Timer Counter Upper 32 bits
#define BCM2835_ST_CLO 0x0004
System Timer Counter Lower 32 bits
#define BCM2835_ST_CS 0x0000
System Timer Control/Status
#define BMC2835_RPI2_DT_FILENAME '/proc/device-tree/soc/ranges'
On all recent OSs, the base of the peripherals is read from a /proc file
#define HIGH 0x1
This means pin HIGH, true, 3.3volts on a pin.
#define LOW 0x0
This means pin LOW, false, 0volts on a pin.
#define MIN(a, b) (a < b ? a : b)
Return the minimum of 2 numbers
Enumeration Type Documentation
enum bcm2835FunctionSelect
bcm2835PortFunction Port function select modes for bcm2835_gpio_fsel()
Enumerator
BCM2835_GPIO_FSEL_INPT
Input 0b000
BCM2835_GPIO_FSEL_OUTP
Output 0b001
BCM2835_GPIO_FSEL_ALT0
Alternate function 0 0b100
BCM2835_GPIO_FSEL_ALT1
Alternate function 1 0b101
BCM2835_GPIO_FSEL_ALT2
Alternate function 2 0b110,
BCM2835_GPIO_FSEL_ALT3
Alternate function 3 0b111
BCM2835_GPIO_FSEL_ALT4
Alternate function 4 0b011
BCM2835_GPIO_FSEL_ALT5
Alternate function 5 0b010
BCM2835_GPIO_FSEL_MASK
Function select bits mask 0b111
enum bcm2835I2CClockDivider
bcm2835I2CClockDivider Specifies the divider used to generate the I2C clock from the
system clock. Clock divided is based on nominal base clock rate of 250MHz
Enumerator
BCM2835_I2C_CLOCK_DIVIDER_2500
2500 = 10us = 100 kHz
BCM2835_I2C_CLOCK_DIVIDER_626
622 = 2.504us = 399.3610 kHz
BCM2835_I2C_CLOCK_DIVIDER_150
150 = 60ns = 1.666 MHz (default at reset)
BCM2835_I2C_CLOCK_DIVIDER_148
148 = 59ns = 1.689 MHz
enum bcm2835I2CReasonCodes
bcm2835I2CReasonCodes Specifies the reason codes for the bcm2835_i2c_write and
bcm2835_i2c_read functions.
Enumerator
BCM2835_I2C_REASON_OK
Success
BCM2835_I2C_REASON_ERROR_NACK
Received a NACK
BCM2835_I2C_REASON_ERROR_CLKT
Received Clock Stretch Timeout
BCM2835_I2C_REASON_ERROR_DATA
Not all data is sent / received
enum bcm2835PadGroup
bcm2835PadGroup Pad group specification for bcm2835_gpio_pad()
Enumerator
BCM2835_PAD_GROUP_GPIO_0_27
Pad group for GPIO pads 0 to 27
BCM2835_PAD_GROUP_GPIO_28_45
Pad group for GPIO pads 28 to 45
BCM2835_PAD_GROUP_GPIO_46_53
Pad group for GPIO pads 46 to 53
enum bcm2835PUDControl
bcm2835PUDControl Pullup/Pulldown defines for bcm2835_gpio_pud()
Enumerator
BCM2835_GPIO_PUD_OFF
Off ? disable pull-up/down 0b00
BCM2835_GPIO_PUD_DOWN
Enable Pull Down control 0b01
BCM2835_GPIO_PUD_UP
Enable Pull Up control 0b10
enum bcm2835RegisterBase
bcm2835RegisterBase Register bases for bcm2835_regbase()
Enumerator
BCM2835_REGBASE_ST
Base of the ST (System Timer) registers.
BCM2835_REGBASE_GPIO
Base of the GPIO registers.
BCM2835_REGBASE_PWM
Base of the PWM registers.
BCM2835_REGBASE_CLK
Base of the CLK registers.
BCM2835_REGBASE_PADS
Base of the PADS registers.
BCM2835_REGBASE_SPI0
Base of the SPI0 registers.
BCM2835_REGBASE_BSC0
Base of the BSC0 registers.
BCM2835_REGBASE_BSC1
Base of the BSC1 registers.
BCM2835_REGBASE_AUX
Base of the AUX registers.
BCM2835_REGBASE_SPI1
Base of the SPI1 registers.
BCM2835_REGBASE_SMI
Base of the SMI registers.
enum bcm2835SPIBitOrder
bcm2835SPIBitOrder SPI Bit order Specifies the SPI data bit ordering for
bcm2835_spi_setBitOrder()
Enumerator
BCM2835_SPI_BIT_ORDER_LSBFIRST
LSB First
BCM2835_SPI_BIT_ORDER_MSBFIRST
MSB First
enum bcm2835SPIChipSelect
bcm2835SPIChipSelect Specify the SPI chip select pin(s)
Enumerator
BCM2835_SPI_CS0
Chip Select 0
BCM2835_SPI_CS1
Chip Select 1
BCM2835_SPI_CS2
Chip Select 2 (ie pins CS1 and CS2 are asserted)
BCM2835_SPI_CS_NONE
No CS, control it yourself
enum bcm2835SPIClockDivider
bcm2835SPIClockDivider Specifies the divider used to generate the SPI clock from the
system clock. Figures below give the divider, clock period and clock frequency. Clock
divided is based on nominal core clock rate of 250MHz on RPi1 and RPi2, and 400MHz on
RPi3. It is reported that (contrary to the documentation) any even divider may used. The
frequencies shown for each divider have been confirmed by measurement on RPi1 and RPi2.
The system clock frequency on RPi3 is different, so the frequency you get from a given
divider will be different. See comments in 'SPI Pins' for information about reliable SPI
speeds. Note: it is possible to change the core clock rate of the RPi 3 back to 250MHz, by
putting
core_freq=250
in the config.txt
Enumerator
BCM2835_SPI_CLOCK_DIVIDER_65536
65536 = 3.814697260kHz on Rpi2, 6.1035156kHz on RPI3
BCM2835_SPI_CLOCK_DIVIDER_32768
32768 = 7.629394531kHz on Rpi2, 12.20703125kHz on RPI3
BCM2835_SPI_CLOCK_DIVIDER_16384
16384 = 15.25878906kHz on Rpi2, 24.4140625kHz on RPI3
BCM2835_SPI_CLOCK_DIVIDER_8192
8192 = 30.51757813kHz on Rpi2, 48.828125kHz on RPI3
BCM2835_SPI_CLOCK_DIVIDER_4096
4096 = 61.03515625kHz on Rpi2, 97.65625kHz on RPI3
BCM2835_SPI_CLOCK_DIVIDER_2048
2048 = 122.0703125kHz on Rpi2, 195.3125kHz on RPI3
BCM2835_SPI_CLOCK_DIVIDER_1024
1024 = 244.140625kHz on Rpi2, 390.625kHz on RPI3
BCM2835_SPI_CLOCK_DIVIDER_512
512 = 488.28125kHz on Rpi2, 781.25kHz on RPI3
BCM2835_SPI_CLOCK_DIVIDER_256
256 = 976.5625kHz on Rpi2, 1.5625MHz on RPI3
BCM2835_SPI_CLOCK_DIVIDER_128
128 = 1.953125MHz on Rpi2, 3.125MHz on RPI3
BCM2835_SPI_CLOCK_DIVIDER_64
64 = 3.90625MHz on Rpi2, 6.250MHz on RPI3
BCM2835_SPI_CLOCK_DIVIDER_32
32 = 7.8125MHz on Rpi2, 12.5MHz on RPI3
BCM2835_SPI_CLOCK_DIVIDER_16
16 = 15.625MHz on Rpi2, 25MHz on RPI3
BCM2835_SPI_CLOCK_DIVIDER_8
8 = 31.25MHz on Rpi2, 50MHz on RPI3
BCM2835_SPI_CLOCK_DIVIDER_4
4 = 62.5MHz on Rpi2, 100MHz on RPI3. Dont expect this speed to work reliably.
BCM2835_SPI_CLOCK_DIVIDER_2
2 = 125MHz on Rpi2, 200MHz on RPI3, fastest you can get. Dont expect this speed to
work reliably.
BCM2835_SPI_CLOCK_DIVIDER_1
1 = 3.814697260kHz on Rpi2, 6.1035156kHz on RPI3, same as 0/65536
enum bcm2835SPIMode
SPI Data mode Specify the SPI data mode to be passed to bcm2835_spi_setDataMode()
Enumerator
BCM2835_SPI_MODE0
CPOL = 0, CPHA = 0
BCM2835_SPI_MODE1
CPOL = 0, CPHA = 1
BCM2835_SPI_MODE2
CPOL = 1, CPHA = 0
BCM2835_SPI_MODE3
CPOL = 1, CPHA = 1
enum RPiGPIOPin
GPIO Pin Numbers. Here we define Raspberry Pin GPIO pins on P1 in terms of the underlying
BCM GPIO pin numbers. These can be passed as a pin number to any function requiring a pin.
Not all pins on the RPi 26 bin IDE plug are connected to GPIO pins and some can adopt an
alternate function. RPi version 2 has some slightly different pinouts, and these are
values RPI_V2_*. RPi B+ has yet differnet pinouts and these are defined in RPI_BPLUS_*. At
bootup, pins 8 and 10 are set to UART0_TXD, UART0_RXD (ie the alt0 function) respectively
When SPI0 is in use (ie after bcm2835_spi_begin()), SPI0 pins are dedicated to SPI and
cant be controlled independently. If you are using the RPi Compute Module, just use the
GPIO number: there is no need to use one of these symbolic names
Enumerator
RPI_GPIO_P1_03
Version 1, Pin P1-03
RPI_GPIO_P1_05
Version 1, Pin P1-05
RPI_GPIO_P1_07
Version 1, Pin P1-07
RPI_GPIO_P1_08
Version 1, Pin P1-08, defaults to alt function 0 UART0_TXD
RPI_GPIO_P1_10
Version 1, Pin P1-10, defaults to alt function 0 UART0_RXD
RPI_GPIO_P1_11
Version 1, Pin P1-11
RPI_GPIO_P1_12
Version 1, Pin P1-12, can be PWM channel 0 in ALT FUN 5
RPI_GPIO_P1_13
Version 1, Pin P1-13
RPI_GPIO_P1_15
Version 1, Pin P1-15
RPI_GPIO_P1_16
Version 1, Pin P1-16
RPI_GPIO_P1_18
Version 1, Pin P1-18
RPI_GPIO_P1_19
Version 1, Pin P1-19, MOSI when SPI0 in use
RPI_GPIO_P1_21
Version 1, Pin P1-21, MISO when SPI0 in use
RPI_GPIO_P1_22
Version 1, Pin P1-22
RPI_GPIO_P1_23
Version 1, Pin P1-23, CLK when SPI0 in use
RPI_GPIO_P1_24
Version 1, Pin P1-24, CE0 when SPI0 in use
RPI_GPIO_P1_26
Version 1, Pin P1-26, CE1 when SPI0 in use
RPI_V2_GPIO_P1_03
Version 2, Pin P1-03
RPI_V2_GPIO_P1_05
Version 2, Pin P1-05
RPI_V2_GPIO_P1_07
Version 2, Pin P1-07
RPI_V2_GPIO_P1_08
Version 2, Pin P1-08, defaults to alt function 0 UART0_TXD
RPI_V2_GPIO_P1_10
Version 2, Pin P1-10, defaults to alt function 0 UART0_RXD
RPI_V2_GPIO_P1_11
Version 2, Pin P1-11
RPI_V2_GPIO_P1_12
Version 2, Pin P1-12, can be PWM channel 0 in ALT FUN 5
RPI_V2_GPIO_P1_13
Version 2, Pin P1-13
RPI_V2_GPIO_P1_15
Version 2, Pin P1-15
RPI_V2_GPIO_P1_16
Version 2, Pin P1-16
RPI_V2_GPIO_P1_18
Version 2, Pin P1-18
RPI_V2_GPIO_P1_19
Version 2, Pin P1-19, MOSI when SPI0 in use
RPI_V2_GPIO_P1_21
Version 2, Pin P1-21, MISO when SPI0 in use
RPI_V2_GPIO_P1_22
Version 2, Pin P1-22
RPI_V2_GPIO_P1_23
Version 2, Pin P1-23, CLK when SPI0 in use
RPI_V2_GPIO_P1_24
Version 2, Pin P1-24, CE0 when SPI0 in use
RPI_V2_GPIO_P1_26
Version 2, Pin P1-26, CE1 when SPI0 in use
RPI_V2_GPIO_P1_29
Version 2, Pin P1-29
RPI_V2_GPIO_P1_31
Version 2, Pin P1-31
RPI_V2_GPIO_P1_32
Version 2, Pin P1-32
RPI_V2_GPIO_P1_33
Version 2, Pin P1-33
RPI_V2_GPIO_P1_35
Version 2, Pin P1-35, can be PWM channel 1 in ALT FUN 5
RPI_V2_GPIO_P1_36
Version 2, Pin P1-36
RPI_V2_GPIO_P1_37
Version 2, Pin P1-37
RPI_V2_GPIO_P1_38
Version 2, Pin P1-38
RPI_V2_GPIO_P1_40
Version 2, Pin P1-40
RPI_V2_GPIO_P5_03
Version 2, Pin P5-03
RPI_V2_GPIO_P5_04
Version 2, Pin P5-04
RPI_V2_GPIO_P5_05
Version 2, Pin P5-05
RPI_V2_GPIO_P5_06
Version 2, Pin P5-06
RPI_BPLUS_GPIO_J8_03
B+, Pin J8-03
RPI_BPLUS_GPIO_J8_05
B+, Pin J8-05
RPI_BPLUS_GPIO_J8_07
B+, Pin J8-07
RPI_BPLUS_GPIO_J8_08
B+, Pin J8-08, defaults to alt function 0 UART0_TXD
RPI_BPLUS_GPIO_J8_10
B+, Pin J8-10, defaults to alt function 0 UART0_RXD
RPI_BPLUS_GPIO_J8_11
B+, Pin J8-11
RPI_BPLUS_GPIO_J8_12
B+, Pin J8-12, can be PWM channel 0 in ALT FUN 5
RPI_BPLUS_GPIO_J8_13
B+, Pin J8-13
RPI_BPLUS_GPIO_J8_15
B+, Pin J8-15
RPI_BPLUS_GPIO_J8_16
B+, Pin J8-16
RPI_BPLUS_GPIO_J8_18
B+, Pin J8-18
RPI_BPLUS_GPIO_J8_19
B+, Pin J8-19, MOSI when SPI0 in use
RPI_BPLUS_GPIO_J8_21
B+, Pin J8-21, MISO when SPI0 in use
RPI_BPLUS_GPIO_J8_22
B+, Pin J8-22
RPI_BPLUS_GPIO_J8_23
B+, Pin J8-23, CLK when SPI0 in use
RPI_BPLUS_GPIO_J8_24
B+, Pin J8-24, CE0 when SPI0 in use
RPI_BPLUS_GPIO_J8_26
B+, Pin J8-26, CE1 when SPI0 in use
RPI_BPLUS_GPIO_J8_29
B+, Pin J8-29,
RPI_BPLUS_GPIO_J8_31
B+, Pin J8-31,
RPI_BPLUS_GPIO_J8_32
B+, Pin J8-32,
RPI_BPLUS_GPIO_J8_33
B+, Pin J8-33,
RPI_BPLUS_GPIO_J8_35
B+, Pin J8-35, can be PWM channel 1 in ALT FUN 5
RPI_BPLUS_GPIO_J8_36
B+, Pin J8-36,
RPI_BPLUS_GPIO_J8_37
B+, Pin J8-37,
RPI_BPLUS_GPIO_J8_38
B+, Pin J8-38,
RPI_BPLUS_GPIO_J8_40
B+, Pin J8-40,
Variable Documentation
volatile uint32_t* bcm2835_aux [extern]
Base of the AUX registers. Available after bcm2835_init has been called (as root)
volatile uint32_t* bcm2835_bsc0 [extern]
Base of the BSC0 registers. Available after bcm2835_init has been called (as root)
volatile uint32_t* bcm2835_bsc1 [extern]
Base of the BSC1 registers. Available after bcm2835_init has been called (as root)
volatile uint32_t* bcm2835_clk [extern]
Base of the CLK registers. Available after bcm2835_init has been called (as root)
volatile uint32_t* bcm2835_gpio [extern]
Base of the GPIO registers. Available after bcm2835_init has been called
volatile uint32_t* bcm2835_pads [extern]
Base of the PADS registers. Available after bcm2835_init has been called (as root)
uint32_t* bcm2835_peripherals [extern]
Virtual memory address of the mapped peripherals block
off_t bcm2835_peripherals_base [extern]
Physical address and size of the peripherals block May be overridden on RPi2
size_t bcm2835_peripherals_size [extern]
Size of the peripherals block to be mapped
volatile uint32_t* bcm2835_pwm [extern]
Base of the PWM registers. Available after bcm2835_init has been called (as root)
volatile uint32_t* bcm2835_smi [extern]
Base of SMI registers. Available after bcm2835_init has been called (as root)
volatile uint32_t* bcm2835_spi0 [extern]
Base of the SPI0 registers. Available after bcm2835_init has been called (as root)
volatile uint32_t* bcm2835_spi1 [extern]
Base of the SPI1 registers. Available after bcm2835_init has been called (as root)
volatile uint32_t* bcm2835_st [extern]
Base of the ST (System Timer) registers. Available after bcm2835_init has been called (as
root)
Author
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