Bouffalo Lab BL702 - Page 308

18
USB
18.1 USB introduction
USB (Universal Serial Bus), fully supports USB1.1 full-speed devices, and partially supports USB2.0.
18.2 USB main features
• Support USB full speed device-mode
• Supports 8 bidirectional endpoints: EP0 can be configured as control/bulk/interrupt/synchronization endpoints,
EP1-EP7 can be configured as bulk/interrupt/synchronization endpoints
• Each endpoint contains TX and RX FIFOs with a depth of 64 bytes and supports DMA
• Support internal transceiver
• Support suspend/resume
• Support LPM
• Support multiple USB interrupt configurations
18.3 USB function description
18.3.1 USB steps
1. Configure the internal transceiver, the corresponding addresses are 0x40000228 and 0x4000022C
2. Configure usb_config and epx_config of each endpoint
3. Configure USB interrupt related registers
4. Configure USB DMA related (optional)
5. Configure GPIO as USB function (internal transmitter----function is 10)
BL702/704/706 Reference Manual
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