PicoSDK + 0/2 examples

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SourceVuRaspberry Pi Pico SDK and ExamplesPicoSDKinterp_config

interp_config struct

Interpolator configuration Each interpolator needs to be configured, these functions provide handy helpers to set up configuration structures.

Syntax

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Summary

Declaration

from interp.h:58

typedef struct { uint32_t ctrl; } interp_config;

Fields

Field

Declared as

interp_config::ctrl

uint32_t

Related Functions

Found 10 other functions taking a interp_config argument:

Function

Description

interp_set_config()

Send configuration to a lane If an invalid configuration is specified (ie a lane specific item is set on wrong lane), depending on setup this function can panic.

interp_config_set_mask()

Set the interpolator mask range Sets the range of bits (least to most) that are allowed to pass through the interpolator

interp_config_set_shift()

Set the interpolator shift value Sets the number of bits the accumulator is shifted before masking, on each iteration.

interp_config_set_signed()

Set sign extension Enables signed mode, where the shifted and masked accumulator value is sign-extended to 32 bits before adding to BASE1, and LANE1 PEEK/POP results appear extended to 32 bits when read by processor.

interp_config_set_blend()

Set blend mode If enabled, LANE1 result is a linear interpolation between BASE0 and BASE1, controlled by the 8 LSBs of lane 1 shift and mask value (a fractional number between 0 and 255/256ths) LANE0 result does not have BASE0 added (yields only the 8 LSBs of lane 1 shift+mask value) FULL result does not have lane 1 shift+mask value added (BASE2 + lane 0 shift+mask) LANE1 SIGNED flag controls whether the interpolation is signed or unsig

interp_config_set_add_raw()

Set raw add option When enabled, mask + shift is bypassed for LANE0 result. This does not affect the FULL result.

interp_config_set_cross_input()

Enable cross input Allows feeding of the accumulator content from the other lane back in to this lanes shift+mask hardware. This will take effect even if the interp_config_set_add_raw option is set as the cross input mux is before the shift+mask bypass

interp_config_set_cross_result()

Enable cross results Allows feeding of the other lane’s result into this lane’s accumulator on a POP operation.

interp_config_set_clamp()

Set interpolator clamp mode (Interpolator 1 only) Only present on INTERP1 on each core. If CLAMP mode is enabled: - LANE0 result is a shifted and masked ACCUM0, clamped by a lower bound of BASE0 and an upper bound of BASE1. - Signedness of these comparisons is determined by LANE0_CTRL_SIGNED

interp_config_set_force_bits()

Set interpolator Force bits ORed into bits 29:28 of the lane result presented to the processor on the bus. No effect on the internal 32-bit datapath. Handy for using a lane to generate sequence of pointers into flash or SRAM