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RasPi Direct Hardware Access
Integrated peripheral access without operating system drivers.
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RasPi Direct Hardware Access
Integrated peripheral access without operating system drivers.
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Declarations for all publicly known (as of 08/2013) Raspberry Pi hardware registers. More...
#include <stdint.h>Go to the source code of this file.
Macros | |
| #define | AUX_OFFSET 0x215000 |
| AUX register offset. | |
| #define | UART1_OFFSET 0x215040 |
| UART1 register offset. | |
| #define | SPI1_OFFSET 0x215080 |
| SPI1 register offset. | |
| #define | SPI2_OFFSET 0x2150c0 |
| SPI2 register offset. | |
| #define | BSC0_OFFSET 0x205000 |
| BSC0 register offset. | |
| #define | BSC1_OFFSET 0x804000 |
| BSC1 register offset. | |
| #define | BSC2_OFFSET 0x805000 |
| BSC2 register offset. | |
| #define | DMA15_OFFSET 0xe05000 |
| DMA 15 register offset. | |
| #define | DMA_OFFSET 0x007000 |
| DMA 0-14 register offset. | |
| #define | DMA_GLOBAL_OFFSET 0x007fe0 |
| DMA_GLOBAL register offset. | |
| #define | RNG_OFFSET 0x104000 |
| RNG register offset. | |
| #define | EMMC_OFFSET 0x300000 |
| EMMC register offset. | |
| #define | GPIO_OFFSET 0x200000 |
| GPIO register offset. | |
| #define | GPCLK_OFFSET 0x101070 |
| GPCLK register offset. | |
| #define | IRQ_OFFSET 0x00b200 |
| IRQ register offset. | |
| #define | PCM_OFFSET 0x203000 |
| PCM register offset. | |
| #define | PWM_OFFSET 0x20c000 |
| PWM register offset. | |
| #define | SPI0_OFFSET 0x204000 |
| SPI0 register offset. | |
| #define | BSCSL_OFFSET 0x214000 |
| BSCSL register offset. | |
| #define | ST_OFFSET 0x003000 |
| ST register offset. | |
| #define | UART0_OFFSET 0x201000 |
| UART0 register offset. | |
| #define | TIMER_OFFSET 0x00b400 |
| TIMER register offset. | |
| #define | USB_OFFSET 0x980000 |
| USB register offset. | |
| #define | MMC_OFFSET 0x202000 |
| MMC register offset. | |
| #define | CM_PASSWD (0x5a) |
| Password for the PASSWD field of various Clock Manager registers. | |
| #define | CM_OFFSET 0x101000 |
| CM register offset. | |
| #define | PM_PASSWD (0x5a) |
| Password for the PASSWD field of various Power Management registers. | |
| #define | PM_OFFSET 0x100000 |
| PM register offset. | |
| #define | HW (*pHW) |
| Accessor to parent structure containing all hardware peripherals. More... | |
| #define | CORE_CLOCK 250000000 |
| Clock frequency in Hz of the APB (Advanced Peripheral Bus). | |
| #define | memory_barrier() asm volatile ("mcr p15, #0, %[zero], c7, c10, #5" :: [zero] "r" (0)) |
| Stall any following memory access until those before this call have completed. Always call this after using a peripheral or in between using two different peripherals! The peripheral bus may mangle your memory accesses otherwise. | |
| #define | synchronization_barrier() asm volatile ("mcr p15, #0, %[zero], c7, c10, #4" :: [zero] "r" (0)) |
| Stall execution until all pending memory accesses have completed. | |
| #define | ARM(x) ((x)+0x20000000ul) |
| Map peripheral register offset to physical address space as seen by the ARM CPU. | |
| #define | BUS(x) ((x)+0x7e000000ul) |
| Map peripheral register offset to bus addresses as seen by the DMA controller and other peripherals. | |
| #define | ST_NOW ((st_time_t)HW.ST.CLO) |
| Return current system timer timestamp. It measures time independent of clock scaling. | |
| #define | ST_1s ((st_delta_t)1000000) |
| System timer frequency in Hz (== timer ticks in 1 s) | |
| #define | ST_1ms (ST_1s/1000) |
| System timer ticks in 1 ms. | |
| #define | ST_1us (ST_1s/1000000) |
| System timer ticks in 1 µs. | |
Typedefs | |
| typedef raspi_SPI1_regs | raspi_SPI2_regs |
| Auxillary mini SPI1 (= SPI2). More... | |
| typedef raspi_BSC0_regs | raspi_BSC1_regs |
| BSC1 (I2C1) master. More... | |
| typedef raspi_BSC0_regs | raspi_BSC2_regs |
| BSC2 (I2C2) master. More... | |
| typedef raspi_DMA15_regs | raspi_DMA_regs [15] |
| DMA channels 0-14. More... | |
| typedef raspi_CM_reg | raspi_CM_regs [57] |
| Clock Manager register array. | |
| typedef uint32_t | st_time_t |
| Type for system timer time stamps. | |
| typedef uint32_t | st_delta_t |
| Type for system timer time stamp differences. | |
Enumerations | |
| enum | raspi_CM_CTL_SRC_t { CM_GND = 0, CM_OSC = 1, CM_PLLA = 4, CM_PLLC = 5, CM_PLLD = 6, CM_HDMI = 7 } |
| Clock manager sources. | |
| enum | raspi_CM_reg_t { CM_VPU = 1, CM_H264 = 5, CM_UNK_0x30 = 6, CM_V3D = 7, CM_CAM0_LP = 8, CM_DSI_ESC = 11, CM_DPI = 13, CM_GP0 = 14, CM_GP1 = 15, CM_GP2 = 16, CM_HSM = 17, CM_ISP = 18, CM_PCM = 19, CM_PWM = 20, CM_SLIM = 21, CM_SMI = 22, CM_EMMC = 24, CM_TSENS = 28, CM_TIME = 29, CM_UART = 30, CM_VEC = 31, CM_UNK_0x190 = 50, CM_ARM = 54, CM_UNK_0x1C0 = 56 } |
| Known clock manager entries. | |
| enum | raspi_PM_RSTC_WRCFG_t { PM_CLR = 0, PM_SET = 1, PM_FULL_RESET = 2 } |
| Possible values for `HW.PM.RSTC.B.WRCFG`. | |
| enum | raspi_GPIO_function { Input = 0, Output = 1, Alt0 = 4, Alt1 = 5, Alt2 = 6, Alt3 = 7, Alt4 = 3, Alt5 = 2 } |
| Select between GPIO input, GPIO output, or one of the alternate (peripheral) functions. | |
Functions | |
| int | raspi_map_hw (void) |
| Map the hardware registers into the current user-space process. Return true if successful, false on error. | |
| static void | gpio_configure (int gpio, raspi_GPIO_function function) |
| Configure GPIO gpio for function function. | |
| static void | gpio_set (int gpio) |
| Set (to logical high) GPIO output gpio. | |
| static void | gpio_clear (int gpio) |
| Clear (set to logical low) GPIO output gpio. | |
| static uint32_t | gpio_read (int gpio) |
| Return true (but not neccessarily 1) if GPIO input gpio is driven high. | |
| static int | st_elapsed (st_time_t before, st_time_t after, st_delta_t diff) |
| Return true if after is at least diff ticks after before. | |
| static void | st_delay (st_delta_t delay) |
| Busy-wait for the given delay. | |
Variables | |
| raspi_peripherals * | pHW |
| Hardware registers base pointer. See HW. | |
Declarations for all publicly known (as of 08/2013) Raspberry Pi hardware registers.
Copyright (c) 2013 OFFIS e.V.
Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.
| struct raspi_peripherals |
Contains all perpherals declared in this file.
See HW for suggested usage.
Documentation taken from the official data sheet and https://github.com/hermanhermitage/videocoreiv/wiki/Register-Documentation
| #define HW (*pHW) |
Accessor to parent structure containing all hardware peripherals.
For example, the UART0 line control register can be accessed as HW.UART0.LCRH. To access the register as a single 32-bit unsigned value, use HW.UART0.LCRH.U. To access just the parity enable bit PEN, use HW.UART0.LCRH.B.PEN.
Names follow those listed in the official datasheet, with common prefixes and suffixes (if any) removed. See Register Declarations for a list of available entries.
1.8.3.1