Documentation
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Index ¶
Constants ¶
This section is empty.
Variables ¶
This section is empty.
Functions ¶
func Lock ¶
func Lock()
Lock disables write access to the IOMUX controller. It is typically used to prevent accidental changes to the electrical properties of the pins, as such a change can sometimes be destructive.
Use carefully!
Locked IOMUX prevents configuring pins. Try to keep the configuration of all pins and peripherals in one place. Remember that UsePin functions in HAL access IOMUX to set the correct alternate function for pin.
Write access to the locked IOMUX generates the BusFault exception which can be very dificult to debug so do not lock IOMUX during development. Lock it at the end of the testing stage and in the finished product.
Locked IOMUX may interfere with some debugger and programmer software and hardware.
Types ¶
type AltFunc ¶
type AltFunc int8
AltFunc represents a mux mode.
const ( ALT AltFunc = 0xf << 0 // Mux mode select field ALT0 AltFunc = 0x0 << 0 // Select ALT0 mux mode ALT1 AltFunc = 0x1 << 0 // Select ALT1 mux mode ALT2 AltFunc = 0x2 << 0 // Select ALT2 mux mode ALT3 AltFunc = 0x3 << 0 // Select ALT3 mux mode ALT4 AltFunc = 0x4 << 0 // Select ALT4 mux mode ALT5 AltFunc = 0x5 << 0 // Select ALT5 mux mode ALT6 AltFunc = 0x6 << 0 // Select ALT6 mux mode ALT7 AltFunc = 0x7 << 0 // Select ALT7 mux mode ALT8 AltFunc = 0x8 << 0 // Select ALT8 mux mode ALT9 AltFunc = 0x9 << 0 // Select ALT9 mux mode ALT10 AltFunc = 0xa << 0 // Select ALT10 mux mode SION AltFunc = 0x1 << 4 // Software Input On field GPIO = ALT5 // More readable alias for ALT5 )
type Config ¶
type Config uint32
const ( FastSR Config = 1 << 0 // Enable fast slew rate Drive Config = 7 << 3 // Drive strength field Drive0 Config = 0 << 3 // Rout = ∞Ω (output driver disabled) Drive1 Config = 1 << 3 // Rout = R, R = 150Ω @ 3V3, R = 260Ω @ 1V8 Drive2 Config = 2 << 3 // Rout = R / 2 Drive3 Config = 3 << 3 // Rout = R / 3 Drive4 Config = 4 << 3 // Rout = R / 4 Drive5 Config = 5 << 3 // Rout = R / 5 Drive6 Config = 6 << 3 // Rout = R / 6 Drive7 Config = 7 << 3 // Rout = R / 7 Speed Config = 3 << 6 // Speed field SpeedLow Config = 0 << 6 // Speed low (50MHz) SpeedMedium Config = 1 << 6 // Speed medium (100MHz) SpeedFast Config = 2 << 6 // Speed fast (150MHz) SpeedMax Config = 3 << 6 // Speed max (200MHz) OpenDrain Config = 1 << 11 // Enable open drain mode PK Config = 1 << 12 // Enable pull/keep mode Pull Config = 1 << 13 // Use pull mode instead of keep mode PullSel Config = 3 << 14 // Select pull direction and strength Down100k Config = 0 << 14 // 100kΩ pull-down Up47k Config = 1 << 14 // 47kΩ pull-up Up100k Config = 2 << 14 // 100kΩ pull up Up22k Config = 3 << 14 // 22kΩ pull up Hys Config = 1 << 16 //+ Enable hysteresis mode )
type Pin ¶
type Pin int16
Pin represents an I/O pin (pad).
const ( EMC_00 Pin = iota EMC_01 EMC_02 EMC_03 EMC_04 EMC_05 EMC_06 EMC_07 EMC_08 EMC_09 EMC_10 EMC_11 EMC_12 EMC_13 EMC_14 EMC_15 EMC_16 EMC_17 EMC_18 EMC_19 EMC_20 EMC_21 EMC_22 EMC_23 EMC_24 EMC_25 EMC_26 EMC_27 EMC_28 EMC_29 EMC_30 EMC_31 EMC_32 EMC_33 EMC_34 EMC_35 EMC_36 EMC_37 EMC_38 EMC_39 EMC_40 EMC_41 AD_B0_00 AD_B0_01 AD_B0_02 AD_B0_03 AD_B0_04 AD_B0_05 AD_B0_06 AD_B0_07 AD_B0_08 AD_B0_09 AD_B0_10 AD_B0_11 AD_B0_12 AD_B0_13 AD_B0_14 AD_B0_15 AD_B1_00 AD_B1_01 AD_B1_02 AD_B1_03 AD_B1_04 AD_B1_05 AD_B1_06 AD_B1_07 AD_B1_08 AD_B1_09 AD_B1_10 AD_B1_11 AD_B1_12 AD_B1_13 AD_B1_14 AD_B1_15 B0_00 B0_01 B0_02 B0_03 B0_04 B0_05 B0_06 B0_07 B0_08 B0_09 B0_10 B0_11 B0_12 B0_13 B0_14 B0_15 B1_00 B1_01 B1_02 B1_03 B1_04 B1_05 B1_06 B1_07 B1_08 B1_09 B1_10 B1_11 B1_12 B1_13 B1_14 B1_15 SD_B0_00 SD_B0_01 SD_B0_02 SD_B0_03 SD_B0_04 SD_B0_05 SD_B1_00 SD_B1_01 SD_B1_02 SD_B1_03 SD_B1_04 SD_B1_05 SD_B1_06 SD_B1_07 SD_B1_08 SD_B1_09 SD_B1_10 SD_B1_11 )
Source Files