Unit BCM2708
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Description
This unit provides the BCM2708 specific implementations of the following devices:
- SPI0
- I2C0
- I2C1
- SPI1
- SPI2
- I2C Slave
- SPI Slave
- DMA
- PWM0
- PWM1
- PCM
- GPIO
- UART0
- UART1
- SDHCI (eMMC)
- Clock
- ARM Timer
- Random
- Mailbox
- Watchdog
- Framebuffer
- MIPI CSI-2 (Camera Serial Interface)
- DSI (Display Serial Interface)
BCM2708 SPI0 Device
The BCM2708 has a single master mode SPI controller that supports 3 wire, 2 wire and LoSSI modes of operation. It also has 2 auxiliary SPI masters which do not support DMA mode (see SPI1/2 below).
The main SPI0 controller supports polled, interrupt and DMA modes and includes 3 chip selects although only CS0 and 1 are available on the 26 or 40 pin header.
By default SPI0 can appear on GPIO pins 7 to 11 (CS1, CS0, MISO, MOSI, SCLK) using alternate function 0 or on GPIO pins 35 to 39 (CS1, CS0, MISO, MOSI, SCLK) using alternate function 0, only pins 7 to 11 are available on the header.
BCM2708 I2C0/1 Device
The BCM2708 has 3 Broadcom Serial Controller (BSC) devices which are fast mode (400Kz) masters numbered BSC0, BSC1 and BSC2.
Device BSC2 is dedicated to the HDMI interface and is not availale for use by the ARM processor. All BSC devices contain a 16 byte FIFO, support 7 bit and 10 bit addressing and have software configurable clock timing.
By default BSC0 can appear on GPIO pins 0 and 1 (Alternate function 0), 28 and 29 (Alternate function 0) or 44 and 45 (Alternate function 1). Unfortunately on all except the Revision 1 models none of these pins are available on the 26 or 40 pin header.
Note: On the Raspberry Pi A+/B+/Zero/2B/3B the ID EEPROM pins on the 40 pin header are actually connected to GPIO 0 and 1 (BSC0)
Device BSC1 can appear on GPIO pins 2 and 3 (Alternate function 0) or 44 and 45 (Alternate function 2) but only pins 2 and 3 are exposed on the 26 or 40 pin header.
BCM2708 SPI1/2 Device
The BCM2708 has 2 additional SPI universal masters available as part of the AUX device which support interrupt mode but not DMA and therefore only allow limited bandwidth transfers due to the CPU overhead required to sustain high data rates.
Both devices support 3 chip selects, by default SPI1 is available on GPIO pins 16 to 21 (CS2, CS1, CS0, MISO, MOSI, SCLK) using alternate function 4 and SPI2 is available on GPIO pins 40 to 45 (MISO, MOSI, SCLK, CS0, CS1, CS2) using alternate function 4. Only pins 16 to 21 are available on the header and only on the 40 pin header of the Raspberry Pi A+/B+/Zero/2B/3B.
BCM2708 DMA Device
The DMA controller has 16 channels in total although not all are available for software to use as some are already used by the GPU.
The firmware will pass the value dma.dmachans on the command line which will indicate which channels are available for our use.
Channels 0 to 6 are normal channels which support 2D stride and transfers up to 1GB per control block
Channels 7 to 14 are Lite channels which do not support stride and only allow transfers up to 64KB per control block Channel 15 is not mentioned in most documentation and is shown as not available in the mask passed in dma.dmachans
Channel 0 and 15 are Bulk channels which have an additional FIFO for faster transfers (8 beat burst per read)
Constants
To be documented
Type definitions
To be documented
Public variables
To be documented
Function declarations
To be documented
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