diff --git a/README.md b/README.md
index dc4419dd..f064bb34 100644
--- a/README.md
+++ b/README.md
@@ -91,6 +91,7 @@ Read the [Contributing Guide](https://github.com/earlephilhower/arduino-pico/blo
 * SparkFun ProMicro RP2040
 * SparkFun ProMicro RP2350
 * SparkFun Thing Plus RP2040
+* SparkFun Thing Plus RP2350
 * uPesy RP2040 DevKit
 * VCC-GND YD-RP2040
 * Viyalab Mizu RP2040
diff --git a/boards.txt b/boards.txt
index 7feda9f9..90d23592 100644
--- a/boards.txt
+++ b/boards.txt
@@ -24921,6 +24921,341 @@ sparkfun_thingplusrp2040.menu.uploadmethod.picoprobe_cmsis_dap.upload.maximum_da
 sparkfun_thingplusrp2040.menu.uploadmethod.picoprobe_cmsis_dap.upload.tool=picoprobe_cmsis_dap
 sparkfun_thingplusrp2040.menu.uploadmethod.picoprobe_cmsis_dap.upload.tool.default=picoprobe_cmsis_dap
 
+# -----------------------------------
+# SparkFun Thing Plus RP2350
+# -----------------------------------
+sparkfun_thingplusrp2350.name=SparkFun Thing Plus RP2350
+sparkfun_thingplusrp2350.vid.0=0x1b4f
+sparkfun_thingplusrp2350.pid.0=0x0038
+sparkfun_thingplusrp2350.vid.1=0x1b4f
+sparkfun_thingplusrp2350.pid.1=0x0138
+sparkfun_thingplusrp2350.vid.2=0x1b4f
+sparkfun_thingplusrp2350.pid.2=0x4038
+sparkfun_thingplusrp2350.vid.3=0x1b4f
+sparkfun_thingplusrp2350.pid.3=0x4138
+sparkfun_thingplusrp2350.vid.4=0x1b4f
+sparkfun_thingplusrp2350.pid.4=0x8038
+sparkfun_thingplusrp2350.vid.5=0x1b4f
+sparkfun_thingplusrp2350.pid.5=0x8138
+sparkfun_thingplusrp2350.vid.6=0x1b4f
+sparkfun_thingplusrp2350.pid.6=0xc038
+sparkfun_thingplusrp2350.vid.7=0x1b4f
+sparkfun_thingplusrp2350.pid.7=0xc138
+sparkfun_thingplusrp2350.upload_port.0.vid=0x1b4f
+sparkfun_thingplusrp2350.upload_port.0.pid=0x0038
+sparkfun_thingplusrp2350.upload_port.1.vid=0x1b4f
+sparkfun_thingplusrp2350.upload_port.1.pid=0x0138
+sparkfun_thingplusrp2350.upload_port.2.vid=0x1b4f
+sparkfun_thingplusrp2350.upload_port.2.pid=0x4038
+sparkfun_thingplusrp2350.upload_port.3.vid=0x1b4f
+sparkfun_thingplusrp2350.upload_port.3.pid=0x4138
+sparkfun_thingplusrp2350.upload_port.4.vid=0x1b4f
+sparkfun_thingplusrp2350.upload_port.4.pid=0x8038
+sparkfun_thingplusrp2350.upload_port.5.vid=0x1b4f
+sparkfun_thingplusrp2350.upload_port.5.pid=0x8138
+sparkfun_thingplusrp2350.upload_port.6.vid=0x1b4f
+sparkfun_thingplusrp2350.upload_port.6.pid=0xc038
+sparkfun_thingplusrp2350.upload_port.7.vid=0x1b4f
+sparkfun_thingplusrp2350.upload_port.7.pid=0xc138
+sparkfun_thingplusrp2350.build.usbvid=-DUSBD_VID=0x1b4f
+sparkfun_thingplusrp2350.build.usbpid=-DUSBD_PID=0x0038
+sparkfun_thingplusrp2350.build.usbpwr=-DUSBD_MAX_POWER_MA=250
+sparkfun_thingplusrp2350.build.board=SPARKFUN_THINGPLUS_RP2350
+sparkfun_thingplusrp2350.build.variant=sparkfun_thingplusrp2350
+sparkfun_thingplusrp2350.upload.maximum_size=16777216
+sparkfun_thingplusrp2350.upload.wait_for_upload_port=true
+sparkfun_thingplusrp2350.upload.erase_cmd=
+sparkfun_thingplusrp2350.serial.disableDTR=false
+sparkfun_thingplusrp2350.serial.disableRTS=false
+sparkfun_thingplusrp2350.build.f_cpu=125000000
+sparkfun_thingplusrp2350.build.led=
+sparkfun_thingplusrp2350.build.core=rp2040
+sparkfun_thingplusrp2350.build.ldscript=memmap_default.ld
+sparkfun_thingplusrp2350.build.boot2=none
+sparkfun_thingplusrp2350.build.usb_manufacturer="SparkFun"
+sparkfun_thingplusrp2350.build.usb_product="Thing Plus RP2350"
+sparkfun_thingplusrp2350.build.psram_length=0x800000
+sparkfun_thingplusrp2350.menu.flash.16777216_0=16MB (no FS)
+sparkfun_thingplusrp2350.menu.flash.16777216_0.upload.maximum_size=16769024
+sparkfun_thingplusrp2350.menu.flash.16777216_0.build.flash_total=16777216
+sparkfun_thingplusrp2350.menu.flash.16777216_0.build.flash_length=16769024
+sparkfun_thingplusrp2350.menu.flash.16777216_0.build.eeprom_start=285204480
+sparkfun_thingplusrp2350.menu.flash.16777216_0.build.fs_start=285204480
+sparkfun_thingplusrp2350.menu.flash.16777216_0.build.fs_end=285204480
+sparkfun_thingplusrp2350.menu.flash.16777216_65536=16MB (Sketch: 16320KB, FS: 64KB)
+sparkfun_thingplusrp2350.menu.flash.16777216_65536.upload.maximum_size=16703488
+sparkfun_thingplusrp2350.menu.flash.16777216_65536.build.flash_total=16777216
+sparkfun_thingplusrp2350.menu.flash.16777216_65536.build.flash_length=16703488
+sparkfun_thingplusrp2350.menu.flash.16777216_65536.build.eeprom_start=285204480
+sparkfun_thingplusrp2350.menu.flash.16777216_65536.build.fs_start=285138944
+sparkfun_thingplusrp2350.menu.flash.16777216_65536.build.fs_end=285204480
+sparkfun_thingplusrp2350.menu.flash.16777216_131072=16MB (Sketch: 16256KB, FS: 128KB)
+sparkfun_thingplusrp2350.menu.flash.16777216_131072.upload.maximum_size=16637952
+sparkfun_thingplusrp2350.menu.flash.16777216_131072.build.flash_total=16777216
+sparkfun_thingplusrp2350.menu.flash.16777216_131072.build.flash_length=16637952
+sparkfun_thingplusrp2350.menu.flash.16777216_131072.build.eeprom_start=285204480
+sparkfun_thingplusrp2350.menu.flash.16777216_131072.build.fs_start=285073408
+sparkfun_thingplusrp2350.menu.flash.16777216_131072.build.fs_end=285204480
+sparkfun_thingplusrp2350.menu.flash.16777216_262144=16MB (Sketch: 16128KB, FS: 256KB)
+sparkfun_thingplusrp2350.menu.flash.16777216_262144.upload.maximum_size=16506880
+sparkfun_thingplusrp2350.menu.flash.16777216_262144.build.flash_total=16777216
+sparkfun_thingplusrp2350.menu.flash.16777216_262144.build.flash_length=16506880
+sparkfun_thingplusrp2350.menu.flash.16777216_262144.build.eeprom_start=285204480
+sparkfun_thingplusrp2350.menu.flash.16777216_262144.build.fs_start=284942336
+sparkfun_thingplusrp2350.menu.flash.16777216_262144.build.fs_end=285204480
+sparkfun_thingplusrp2350.menu.flash.16777216_524288=16MB (Sketch: 15872KB, FS: 512KB)
+sparkfun_thingplusrp2350.menu.flash.16777216_524288.upload.maximum_size=16244736
+sparkfun_thingplusrp2350.menu.flash.16777216_524288.build.flash_total=16777216
+sparkfun_thingplusrp2350.menu.flash.16777216_524288.build.flash_length=16244736
+sparkfun_thingplusrp2350.menu.flash.16777216_524288.build.eeprom_start=285204480
+sparkfun_thingplusrp2350.menu.flash.16777216_524288.build.fs_start=284680192
+sparkfun_thingplusrp2350.menu.flash.16777216_524288.build.fs_end=285204480
+sparkfun_thingplusrp2350.menu.flash.16777216_1048576=16MB (Sketch: 15MB, FS: 1MB)
+sparkfun_thingplusrp2350.menu.flash.16777216_1048576.upload.maximum_size=15720448
+sparkfun_thingplusrp2350.menu.flash.16777216_1048576.build.flash_total=16777216
+sparkfun_thingplusrp2350.menu.flash.16777216_1048576.build.flash_length=15720448
+sparkfun_thingplusrp2350.menu.flash.16777216_1048576.build.eeprom_start=285204480
+sparkfun_thingplusrp2350.menu.flash.16777216_1048576.build.fs_start=284155904
+sparkfun_thingplusrp2350.menu.flash.16777216_1048576.build.fs_end=285204480
+sparkfun_thingplusrp2350.menu.flash.16777216_2097152=16MB (Sketch: 14MB, FS: 2MB)
+sparkfun_thingplusrp2350.menu.flash.16777216_2097152.upload.maximum_size=14671872
+sparkfun_thingplusrp2350.menu.flash.16777216_2097152.build.flash_total=16777216
+sparkfun_thingplusrp2350.menu.flash.16777216_2097152.build.flash_length=14671872
+sparkfun_thingplusrp2350.menu.flash.16777216_2097152.build.eeprom_start=285204480
+sparkfun_thingplusrp2350.menu.flash.16777216_2097152.build.fs_start=283107328
+sparkfun_thingplusrp2350.menu.flash.16777216_2097152.build.fs_end=285204480
+sparkfun_thingplusrp2350.menu.flash.16777216_3145728=16MB (Sketch: 13MB, FS: 3MB)
+sparkfun_thingplusrp2350.menu.flash.16777216_3145728.upload.maximum_size=13623296
+sparkfun_thingplusrp2350.menu.flash.16777216_3145728.build.flash_total=16777216
+sparkfun_thingplusrp2350.menu.flash.16777216_3145728.build.flash_length=13623296
+sparkfun_thingplusrp2350.menu.flash.16777216_3145728.build.eeprom_start=285204480
+sparkfun_thingplusrp2350.menu.flash.16777216_3145728.build.fs_start=282058752
+sparkfun_thingplusrp2350.menu.flash.16777216_3145728.build.fs_end=285204480
+sparkfun_thingplusrp2350.menu.flash.16777216_4194304=16MB (Sketch: 12MB, FS: 4MB)
+sparkfun_thingplusrp2350.menu.flash.16777216_4194304.upload.maximum_size=12574720
+sparkfun_thingplusrp2350.menu.flash.16777216_4194304.build.flash_total=16777216
+sparkfun_thingplusrp2350.menu.flash.16777216_4194304.build.flash_length=12574720
+sparkfun_thingplusrp2350.menu.flash.16777216_4194304.build.eeprom_start=285204480
+sparkfun_thingplusrp2350.menu.flash.16777216_4194304.build.fs_start=281010176
+sparkfun_thingplusrp2350.menu.flash.16777216_4194304.build.fs_end=285204480
+sparkfun_thingplusrp2350.menu.flash.16777216_5242880=16MB (Sketch: 11MB, FS: 5MB)
+sparkfun_thingplusrp2350.menu.flash.16777216_5242880.upload.maximum_size=11526144
+sparkfun_thingplusrp2350.menu.flash.16777216_5242880.build.flash_total=16777216
+sparkfun_thingplusrp2350.menu.flash.16777216_5242880.build.flash_length=11526144
+sparkfun_thingplusrp2350.menu.flash.16777216_5242880.build.eeprom_start=285204480
+sparkfun_thingplusrp2350.menu.flash.16777216_5242880.build.fs_start=279961600
+sparkfun_thingplusrp2350.menu.flash.16777216_5242880.build.fs_end=285204480
+sparkfun_thingplusrp2350.menu.flash.16777216_6291456=16MB (Sketch: 10MB, FS: 6MB)
+sparkfun_thingplusrp2350.menu.flash.16777216_6291456.upload.maximum_size=10477568
+sparkfun_thingplusrp2350.menu.flash.16777216_6291456.build.flash_total=16777216
+sparkfun_thingplusrp2350.menu.flash.16777216_6291456.build.flash_length=10477568
+sparkfun_thingplusrp2350.menu.flash.16777216_6291456.build.eeprom_start=285204480
+sparkfun_thingplusrp2350.menu.flash.16777216_6291456.build.fs_start=278913024
+sparkfun_thingplusrp2350.menu.flash.16777216_6291456.build.fs_end=285204480
+sparkfun_thingplusrp2350.menu.flash.16777216_7340032=16MB (Sketch: 9MB, FS: 7MB)
+sparkfun_thingplusrp2350.menu.flash.16777216_7340032.upload.maximum_size=9428992
+sparkfun_thingplusrp2350.menu.flash.16777216_7340032.build.flash_total=16777216
+sparkfun_thingplusrp2350.menu.flash.16777216_7340032.build.flash_length=9428992
+sparkfun_thingplusrp2350.menu.flash.16777216_7340032.build.eeprom_start=285204480
+sparkfun_thingplusrp2350.menu.flash.16777216_7340032.build.fs_start=277864448
+sparkfun_thingplusrp2350.menu.flash.16777216_7340032.build.fs_end=285204480
+sparkfun_thingplusrp2350.menu.flash.16777216_8388608=16MB (Sketch: 8MB, FS: 8MB)
+sparkfun_thingplusrp2350.menu.flash.16777216_8388608.upload.maximum_size=8380416
+sparkfun_thingplusrp2350.menu.flash.16777216_8388608.build.flash_total=16777216
+sparkfun_thingplusrp2350.menu.flash.16777216_8388608.build.flash_length=8380416
+sparkfun_thingplusrp2350.menu.flash.16777216_8388608.build.eeprom_start=285204480
+sparkfun_thingplusrp2350.menu.flash.16777216_8388608.build.fs_start=276815872
+sparkfun_thingplusrp2350.menu.flash.16777216_8388608.build.fs_end=285204480
+sparkfun_thingplusrp2350.menu.flash.16777216_9437184=16MB (Sketch: 7MB, FS: 9MB)
+sparkfun_thingplusrp2350.menu.flash.16777216_9437184.upload.maximum_size=7331840
+sparkfun_thingplusrp2350.menu.flash.16777216_9437184.build.flash_total=16777216
+sparkfun_thingplusrp2350.menu.flash.16777216_9437184.build.flash_length=7331840
+sparkfun_thingplusrp2350.menu.flash.16777216_9437184.build.eeprom_start=285204480
+sparkfun_thingplusrp2350.menu.flash.16777216_9437184.build.fs_start=275767296
+sparkfun_thingplusrp2350.menu.flash.16777216_9437184.build.fs_end=285204480
+sparkfun_thingplusrp2350.menu.flash.16777216_10485760=16MB (Sketch: 6MB, FS: 10MB)
+sparkfun_thingplusrp2350.menu.flash.16777216_10485760.upload.maximum_size=6283264
+sparkfun_thingplusrp2350.menu.flash.16777216_10485760.build.flash_total=16777216
+sparkfun_thingplusrp2350.menu.flash.16777216_10485760.build.flash_length=6283264
+sparkfun_thingplusrp2350.menu.flash.16777216_10485760.build.eeprom_start=285204480
+sparkfun_thingplusrp2350.menu.flash.16777216_10485760.build.fs_start=274718720
+sparkfun_thingplusrp2350.menu.flash.16777216_10485760.build.fs_end=285204480
+sparkfun_thingplusrp2350.menu.flash.16777216_11534336=16MB (Sketch: 5MB, FS: 11MB)
+sparkfun_thingplusrp2350.menu.flash.16777216_11534336.upload.maximum_size=5234688
+sparkfun_thingplusrp2350.menu.flash.16777216_11534336.build.flash_total=16777216
+sparkfun_thingplusrp2350.menu.flash.16777216_11534336.build.flash_length=5234688
+sparkfun_thingplusrp2350.menu.flash.16777216_11534336.build.eeprom_start=285204480
+sparkfun_thingplusrp2350.menu.flash.16777216_11534336.build.fs_start=273670144
+sparkfun_thingplusrp2350.menu.flash.16777216_11534336.build.fs_end=285204480
+sparkfun_thingplusrp2350.menu.flash.16777216_12582912=16MB (Sketch: 4MB, FS: 12MB)
+sparkfun_thingplusrp2350.menu.flash.16777216_12582912.upload.maximum_size=4186112
+sparkfun_thingplusrp2350.menu.flash.16777216_12582912.build.flash_total=16777216
+sparkfun_thingplusrp2350.menu.flash.16777216_12582912.build.flash_length=4186112
+sparkfun_thingplusrp2350.menu.flash.16777216_12582912.build.eeprom_start=285204480
+sparkfun_thingplusrp2350.menu.flash.16777216_12582912.build.fs_start=272621568
+sparkfun_thingplusrp2350.menu.flash.16777216_12582912.build.fs_end=285204480
+sparkfun_thingplusrp2350.menu.flash.16777216_13631488=16MB (Sketch: 3MB, FS: 13MB)
+sparkfun_thingplusrp2350.menu.flash.16777216_13631488.upload.maximum_size=3137536
+sparkfun_thingplusrp2350.menu.flash.16777216_13631488.build.flash_total=16777216
+sparkfun_thingplusrp2350.menu.flash.16777216_13631488.build.flash_length=3137536
+sparkfun_thingplusrp2350.menu.flash.16777216_13631488.build.eeprom_start=285204480
+sparkfun_thingplusrp2350.menu.flash.16777216_13631488.build.fs_start=271572992
+sparkfun_thingplusrp2350.menu.flash.16777216_13631488.build.fs_end=285204480
+sparkfun_thingplusrp2350.menu.flash.16777216_14680064=16MB (Sketch: 2MB, FS: 14MB)
+sparkfun_thingplusrp2350.menu.flash.16777216_14680064.upload.maximum_size=2088960
+sparkfun_thingplusrp2350.menu.flash.16777216_14680064.build.flash_total=16777216
+sparkfun_thingplusrp2350.menu.flash.16777216_14680064.build.flash_length=2088960
+sparkfun_thingplusrp2350.menu.flash.16777216_14680064.build.eeprom_start=285204480
+sparkfun_thingplusrp2350.menu.flash.16777216_14680064.build.fs_start=270524416
+sparkfun_thingplusrp2350.menu.flash.16777216_14680064.build.fs_end=285204480
+sparkfun_thingplusrp2350.menu.flash.16777216_15728640=16MB (Sketch: 1MB, FS: 15MB)
+sparkfun_thingplusrp2350.menu.flash.16777216_15728640.upload.maximum_size=1040384
+sparkfun_thingplusrp2350.menu.flash.16777216_15728640.build.flash_total=16777216
+sparkfun_thingplusrp2350.menu.flash.16777216_15728640.build.flash_length=1040384
+sparkfun_thingplusrp2350.menu.flash.16777216_15728640.build.eeprom_start=285204480
+sparkfun_thingplusrp2350.menu.flash.16777216_15728640.build.fs_start=269475840
+sparkfun_thingplusrp2350.menu.flash.16777216_15728640.build.fs_end=285204480
+sparkfun_thingplusrp2350.menu.arch.arm=ARM
+sparkfun_thingplusrp2350.menu.arch.arm.build.chip=rp2350
+sparkfun_thingplusrp2350.menu.arch.arm.build.toolchain=arm-none-eabi
+sparkfun_thingplusrp2350.menu.arch.arm.build.toolchainpkg=pqt-gcc
+sparkfun_thingplusrp2350.menu.arch.arm.build.toolchainopts=-mcpu=cortex-m33 -mthumb -march=armv8-m.main+fp+dsp -mfloat-abi=softfp -mcmse
+sparkfun_thingplusrp2350.menu.arch.arm.build.uf2family=--family rp2350-arm-s --abs-block
+sparkfun_thingplusrp2350.menu.arch.riscv=RISC-V
+sparkfun_thingplusrp2350.menu.arch.riscv.build.chip=rp2350-riscv
+sparkfun_thingplusrp2350.menu.arch.riscv.build.toolchain=riscv32-unknown-elf
+sparkfun_thingplusrp2350.menu.arch.riscv.build.toolchainpkg=pqt-gcc-riscv
+sparkfun_thingplusrp2350.menu.arch.riscv.build.toolchainopts=-march=rv32imac_zicsr_zifencei_zba_zbb_zbs_zbkb -mabi=ilp32
+sparkfun_thingplusrp2350.menu.arch.riscv.build.uf2family=--family rp2350-riscv --abs-block
+sparkfun_thingplusrp2350.menu.freq.150=150 MHz
+sparkfun_thingplusrp2350.menu.freq.150.build.f_cpu=150000000L
+sparkfun_thingplusrp2350.menu.freq.50=50 MHz
+sparkfun_thingplusrp2350.menu.freq.50.build.f_cpu=50000000L
+sparkfun_thingplusrp2350.menu.freq.100=100 MHz
+sparkfun_thingplusrp2350.menu.freq.100.build.f_cpu=100000000L
+sparkfun_thingplusrp2350.menu.freq.120=120 MHz
+sparkfun_thingplusrp2350.menu.freq.120.build.f_cpu=120000000L
+sparkfun_thingplusrp2350.menu.freq.125=125 MHz
+sparkfun_thingplusrp2350.menu.freq.125.build.f_cpu=125000000L
+sparkfun_thingplusrp2350.menu.freq.128=128 MHz
+sparkfun_thingplusrp2350.menu.freq.128.build.f_cpu=128000000L
+sparkfun_thingplusrp2350.menu.freq.133=133 MHz
+sparkfun_thingplusrp2350.menu.freq.133.build.f_cpu=133000000L
+sparkfun_thingplusrp2350.menu.freq.175=175 MHz (Overclock)
+sparkfun_thingplusrp2350.menu.freq.175.build.f_cpu=175000000L
+sparkfun_thingplusrp2350.menu.freq.200=200 MHz (Overclock)
+sparkfun_thingplusrp2350.menu.freq.200.build.f_cpu=200000000L
+sparkfun_thingplusrp2350.menu.freq.225=225 MHz (Overclock)
+sparkfun_thingplusrp2350.menu.freq.225.build.f_cpu=225000000L
+sparkfun_thingplusrp2350.menu.freq.240=240 MHz (Overclock)
+sparkfun_thingplusrp2350.menu.freq.240.build.f_cpu=240000000L
+sparkfun_thingplusrp2350.menu.freq.250=250 MHz (Overclock)
+sparkfun_thingplusrp2350.menu.freq.250.build.f_cpu=250000000L
+sparkfun_thingplusrp2350.menu.freq.275=275 MHz (Overclock)
+sparkfun_thingplusrp2350.menu.freq.275.build.f_cpu=275000000L
+sparkfun_thingplusrp2350.menu.freq.300=300 MHz (Overclock)
+sparkfun_thingplusrp2350.menu.freq.300.build.f_cpu=300000000L
+sparkfun_thingplusrp2350.menu.opt.Small=Small (-Os) (standard)
+sparkfun_thingplusrp2350.menu.opt.Small.build.flags.optimize=-Os
+sparkfun_thingplusrp2350.menu.opt.Optimize=Optimize (-O)
+sparkfun_thingplusrp2350.menu.opt.Optimize.build.flags.optimize=-O
+sparkfun_thingplusrp2350.menu.opt.Optimize2=Optimize More (-O2)
+sparkfun_thingplusrp2350.menu.opt.Optimize2.build.flags.optimize=-O2
+sparkfun_thingplusrp2350.menu.opt.Optimize3=Optimize Even More (-O3)
+sparkfun_thingplusrp2350.menu.opt.Optimize3.build.flags.optimize=-O3
+sparkfun_thingplusrp2350.menu.opt.Fast=Fast (-Ofast) (maybe slower)
+sparkfun_thingplusrp2350.menu.opt.Fast.build.flags.optimize=-Ofast
+sparkfun_thingplusrp2350.menu.opt.Debug=Debug (-Og)
+sparkfun_thingplusrp2350.menu.opt.Debug.build.flags.optimize=-Og
+sparkfun_thingplusrp2350.menu.rtti.Disabled=Disabled
+sparkfun_thingplusrp2350.menu.rtti.Disabled.build.flags.rtti=-fno-rtti
+sparkfun_thingplusrp2350.menu.rtti.Enabled=Enabled
+sparkfun_thingplusrp2350.menu.rtti.Enabled.build.flags.rtti=
+sparkfun_thingplusrp2350.menu.stackprotect.Disabled=Disabled
+sparkfun_thingplusrp2350.menu.stackprotect.Disabled.build.flags.stackprotect=
+sparkfun_thingplusrp2350.menu.stackprotect.Enabled=Enabled
+sparkfun_thingplusrp2350.menu.stackprotect.Enabled.build.flags.stackprotect=-fstack-protector
+sparkfun_thingplusrp2350.menu.exceptions.Disabled=Disabled
+sparkfun_thingplusrp2350.menu.exceptions.Disabled.build.flags.exceptions=-fno-exceptions
+sparkfun_thingplusrp2350.menu.exceptions.Disabled.build.flags.libstdcpp=-lstdc++
+sparkfun_thingplusrp2350.menu.exceptions.Enabled=Enabled
+sparkfun_thingplusrp2350.menu.exceptions.Enabled.build.flags.exceptions=-fexceptions
+sparkfun_thingplusrp2350.menu.exceptions.Enabled.build.flags.libstdcpp=-lstdc++-exc
+sparkfun_thingplusrp2350.menu.dbgport.Disabled=Disabled
+sparkfun_thingplusrp2350.menu.dbgport.Disabled.build.debug_port=
+sparkfun_thingplusrp2350.menu.dbgport.Serial=Serial
+sparkfun_thingplusrp2350.menu.dbgport.Serial.build.debug_port=-DDEBUG_RP2040_PORT=Serial
+sparkfun_thingplusrp2350.menu.dbgport.Serial1=Serial1
+sparkfun_thingplusrp2350.menu.dbgport.Serial1.build.debug_port=-DDEBUG_RP2040_PORT=Serial1
+sparkfun_thingplusrp2350.menu.dbgport.Serial2=Serial2
+sparkfun_thingplusrp2350.menu.dbgport.Serial2.build.debug_port=-DDEBUG_RP2040_PORT=Serial2
+sparkfun_thingplusrp2350.menu.dbglvl.None=None
+sparkfun_thingplusrp2350.menu.dbglvl.None.build.debug_level=
+sparkfun_thingplusrp2350.menu.dbglvl.Core=Core
+sparkfun_thingplusrp2350.menu.dbglvl.Core.build.debug_level=-DDEBUG_RP2040_CORE
+sparkfun_thingplusrp2350.menu.dbglvl.SPI=SPI
+sparkfun_thingplusrp2350.menu.dbglvl.SPI.build.debug_level=-DDEBUG_RP2040_SPI
+sparkfun_thingplusrp2350.menu.dbglvl.Wire=Wire
+sparkfun_thingplusrp2350.menu.dbglvl.Wire.build.debug_level=-DDEBUG_RP2040_WIRE
+sparkfun_thingplusrp2350.menu.dbglvl.Bluetooth=Bluetooth
+sparkfun_thingplusrp2350.menu.dbglvl.Bluetooth.build.debug_level=-DDEBUG_RP2040_BLUETOOTH
+sparkfun_thingplusrp2350.menu.dbglvl.All=All
+sparkfun_thingplusrp2350.menu.dbglvl.All.build.debug_level=-DDEBUG_RP2040_WIRE -DDEBUG_RP2040_SPI -DDEBUG_RP2040_CORE -DDEBUG_RP2040_BLUETOOTH
+sparkfun_thingplusrp2350.menu.dbglvl.NDEBUG=NDEBUG
+sparkfun_thingplusrp2350.menu.dbglvl.NDEBUG.build.debug_level=-DNDEBUG
+sparkfun_thingplusrp2350.menu.usbstack.picosdk=Pico SDK
+sparkfun_thingplusrp2350.menu.usbstack.picosdk.build.usbstack_flags=
+sparkfun_thingplusrp2350.menu.usbstack.tinyusb=Adafruit TinyUSB
+sparkfun_thingplusrp2350.menu.usbstack.tinyusb.build.usbstack_flags=-DUSE_TINYUSB "-I{runtime.platform.path}/libraries/Adafruit_TinyUSB_Arduino/src/arduino"
+sparkfun_thingplusrp2350.menu.usbstack.tinyusb_host=Adafruit TinyUSB Host (native)
+sparkfun_thingplusrp2350.menu.usbstack.tinyusb_host.build.usbstack_flags=-DUSE_TINYUSB -DUSE_TINYUSB_HOST "-I{runtime.platform.path}/libraries/Adafruit_TinyUSB_Arduino/src/arduino"
+sparkfun_thingplusrp2350.menu.usbstack.nousb=No USB
+sparkfun_thingplusrp2350.menu.usbstack.nousb.build.usbstack_flags="-DNO_USB -DDISABLE_USB_SERIAL -I{runtime.platform.path}/tools/libpico"
+sparkfun_thingplusrp2350.menu.ipbtstack.ipv4only=IPv4 Only
+sparkfun_thingplusrp2350.menu.ipbtstack.ipv4only.build.libpicow=libipv4.a
+sparkfun_thingplusrp2350.menu.ipbtstack.ipv4only.build.libpicowdefs=-DLWIP_IPV6=0 -DLWIP_IPV4=1
+sparkfun_thingplusrp2350.menu.ipbtstack.ipv4ipv6=IPv4 + IPv6
+sparkfun_thingplusrp2350.menu.ipbtstack.ipv4ipv6.build.libpicow=libipv4-ipv6.a
+sparkfun_thingplusrp2350.menu.ipbtstack.ipv4ipv6.build.libpicowdefs=-DLWIP_IPV6=1 -DLWIP_IPV4=1
+sparkfun_thingplusrp2350.menu.ipbtstack.ipv4btcble=IPv4 + Bluetooth
+sparkfun_thingplusrp2350.menu.ipbtstack.ipv4btcble.build.libpicow=libipv4-bt.a
+sparkfun_thingplusrp2350.menu.ipbtstack.ipv4btcble.build.libpicowdefs=-DLWIP_IPV6=0 -DLWIP_IPV4=1 -DENABLE_CLASSIC=1 -DENABLE_BLE=1
+sparkfun_thingplusrp2350.menu.ipbtstack.ipv4ipv6btcble=IPv4 + IPv6 + Bluetooth
+sparkfun_thingplusrp2350.menu.ipbtstack.ipv4ipv6btcble.build.libpicow=libipv4-ipv6-bt.a
+sparkfun_thingplusrp2350.menu.ipbtstack.ipv4ipv6btcble.build.libpicowdefs=-DLWIP_IPV6=1 -DLWIP_IPV4=1 -DENABLE_CLASSIC=1 -DENABLE_BLE=1
+sparkfun_thingplusrp2350.menu.ipbtstack.ipv4onlybig=IPv4 Only - 32K
+sparkfun_thingplusrp2350.menu.ipbtstack.ipv4onlybig.build.libpicow=libipv4-big.a
+sparkfun_thingplusrp2350.menu.ipbtstack.ipv4onlybig.build.libpicowdefs=-DLWIP_IPV6=0 -DLWIP_IPV4=1 -D__LWIP_MEMMULT=2
+sparkfun_thingplusrp2350.menu.ipbtstack.ipv4ipv6big=IPv4 + IPv6 - 32K
+sparkfun_thingplusrp2350.menu.ipbtstack.ipv4ipv6big.build.libpicow=libipv4-ipv6-big.a
+sparkfun_thingplusrp2350.menu.ipbtstack.ipv4ipv6big.build.libpicowdefs=-DLWIP_IPV6=1 -DLWIP_IPV4=1 -D__LWIP_MEMMULT=2
+sparkfun_thingplusrp2350.menu.ipbtstack.ipv4btcblebig=IPv4 + Bluetooth - 32K
+sparkfun_thingplusrp2350.menu.ipbtstack.ipv4btcblebig.build.libpicow=libipv4-bt-big.a
+sparkfun_thingplusrp2350.menu.ipbtstack.ipv4btcblebig.build.libpicowdefs=-DLWIP_IPV6=0 -DLWIP_IPV4=1 -DENABLE_CLASSIC=1 -DENABLE_BLE=1 -D__LWIP_MEMMULT=2
+sparkfun_thingplusrp2350.menu.ipbtstack.ipv4ipv6btcblebig=IPv4 + IPv6 + Bluetooth - 32K
+sparkfun_thingplusrp2350.menu.ipbtstack.ipv4ipv6btcblebig.build.libpicow=libipv4-ipv6-bt-big.a
+sparkfun_thingplusrp2350.menu.ipbtstack.ipv4ipv6btcblebig.build.libpicowdefs=-DLWIP_IPV6=1 -DLWIP_IPV4=1 -DENABLE_CLASSIC=1 -DENABLE_BLE=1 -D__LWIP_MEMMULT=2
+sparkfun_thingplusrp2350.menu.uploadmethod.default=Default (UF2)
+sparkfun_thingplusrp2350.menu.uploadmethod.default.build.ram_length=512k
+sparkfun_thingplusrp2350.menu.uploadmethod.default.build.debugscript=picoprobe_cmsis_dap.tcl
+sparkfun_thingplusrp2350.menu.uploadmethod.default.upload.maximum_data_size=524288
+sparkfun_thingplusrp2350.menu.uploadmethod.default.upload.tool=uf2conv
+sparkfun_thingplusrp2350.menu.uploadmethod.default.upload.tool.default=uf2conv
+sparkfun_thingplusrp2350.menu.uploadmethod.default.upload.tool.network=uf2conv-network
+sparkfun_thingplusrp2350.menu.uploadmethod.picotool=Picotool
+sparkfun_thingplusrp2350.menu.uploadmethod.picotool.build.ram_length=512k
+sparkfun_thingplusrp2350.menu.uploadmethod.picotool.build.debugscript=picoprobe.tcl
+sparkfun_thingplusrp2350.menu.uploadmethod.picotool.build.picodebugflags=-DENABLE_PICOTOOL_USB
+sparkfun_thingplusrp2350.menu.uploadmethod.picotool.upload.maximum_data_size=524288
+sparkfun_thingplusrp2350.menu.uploadmethod.picotool.upload.tool=picotool
+sparkfun_thingplusrp2350.menu.uploadmethod.picotool.upload.tool.default=picotool
+sparkfun_thingplusrp2350.menu.uploadmethod.picoprobe_cmsis_dap=Picoprobe/Debugprobe (CMSIS-DAP)
+sparkfun_thingplusrp2350.menu.uploadmethod.picoprobe_cmsis_dap.build.ram_length=512k
+sparkfun_thingplusrp2350.menu.uploadmethod.picoprobe_cmsis_dap.build.debugscript=picoprobe_cmsis_dap.tcl
+sparkfun_thingplusrp2350.menu.uploadmethod.picoprobe_cmsis_dap.upload.maximum_data_size=524288
+sparkfun_thingplusrp2350.menu.uploadmethod.picoprobe_cmsis_dap.upload.tool=picoprobe_cmsis_dap
+sparkfun_thingplusrp2350.menu.uploadmethod.picoprobe_cmsis_dap.upload.tool.default=picoprobe_cmsis_dap
+
 # -----------------------------------
 # uPesy RP2040 DevKit
 # -----------------------------------
diff --git a/package/package_pico_index.template.json b/package/package_pico_index.template.json
index f0a53e0b..41284cb3 100644
--- a/package/package_pico_index.template.json
+++ b/package/package_pico_index.template.json
@@ -281,6 +281,9 @@
                   {
                      "name": "SparkFun Thing Plus RP2040"
                   },
+                  {
+                     "name": "SparkFun Thing Plus RP2350"
+                  },
                   {
                      "name": "uPesy RP2040 DevKit"
                   },
diff --git a/tools/json/sparkfun_thingplusrp2350.json b/tools/json/sparkfun_thingplusrp2350.json
new file mode 100644
index 00000000..0f9fdaf1
--- /dev/null
+++ b/tools/json/sparkfun_thingplusrp2350.json
@@ -0,0 +1,56 @@
+{
+    "build": {
+        "arduino": {
+            "earlephilhower": {
+                "boot2_source": "none.S",
+                "usb_vid": "0x1B4F",
+                "usb_pid": "0x0038"
+            }
+        },
+        "core": "earlephilhower",
+        "cpu": "cortex-m33",
+        "extra_flags": "-DARDUINO_SPARKFUN_THINGPLUS_RP2350 -DARDUINO_ARCH_RP2040 -DUSBD_MAX_POWER_MA=250 ",
+        "f_cpu": "150000000L",
+        "hwids": [
+            [
+                "0x2E8A",
+                "0x00C0"
+            ],
+            [
+                "0x1B4F",
+                "0x0038"
+            ]
+        ],
+        "mcu": "rp2350",
+        "variant": "sparkfun_thingplusrp2350"
+    },
+    "debug": {
+        "jlink_device": "RP2350_0",
+        "openocd_target": "rp2350.cfg",
+        "svd_path": "rp2350.svd"
+    },
+    "frameworks": [
+        "arduino"
+    ],
+    "name": "Thing Plus RP2350",
+    "upload": {
+        "maximum_ram_size": 524288,
+        "maximum_size": 16777216,
+        "require_upload_port": true,
+        "native_usb": true,
+        "use_1200bps_touch": true,
+        "wait_for_upload_port": false,
+        "protocol": "picotool",
+        "protocols": [
+            "blackmagic",
+            "cmsis-dap",
+            "jlink",
+            "raspberrypi-swd",
+            "picotool",
+            "picoprobe"
+        ],
+        "psram_length": 8388608
+    },
+    "url": "https://www.raspberrypi.org/products/raspberry-pi-pico/",
+    "vendor": "SparkFun"
+}
\ No newline at end of file
diff --git a/tools/makeboards.py b/tools/makeboards.py
index c4f06c2b..b4e68e9d 100755
--- a/tools/makeboards.py
+++ b/tools/makeboards.py
@@ -630,6 +630,7 @@ def MakeBoardJSON(name, chip, vendor_name, product_name, vid, pid, pwr, boarddef
 MakeBoard("sparkfun_promicrorp2040", "rp2040", "SparkFun", "ProMicro RP2040", "0x1b4f", "0x0026", 250, "SPARKFUN_PROMICRO_RP2040", 16, 0, "boot2_generic_03h_4_padded_checksum")
 MakeBoard("sparkfun_promicrorp2350", "rp2350", "SparkFun", "ProMicro RP2350", "0x1b4f", "0x0026", 250, "SPARKFUN_PROMICRO_RP2350", 16, 8, "none")
 MakeBoard("sparkfun_thingplusrp2040", "rp2040", "SparkFun", "Thing Plus RP2040", "0x1b4f", "0x0026", 250, "SPARKFUN_THINGPLUS_RP2040", 16, 0, "boot2_w25q080_2_padded_checksum")
+MakeBoard("sparkfun_thingplusrp2350", "rp2350", "SparkFun", "Thing Plus RP2350", "0x1b4f", "0x0038", 250, "SPARKFUN_THINGPLUS_RP2350", 16, 8, "none")
 
 # Upesy
 MakeBoard("upesy_rp2040_devkit", "rp2040", "uPesy", "RP2040 DevKit", "0x2e8a", "0x1007", 250, "UPESY_RP2040_DEVKIT", 2, 0, "boot2_w25q080_2_padded_checksum")
diff --git a/variants/sparkfun_thingplusrp2350/picow_digital.cpp b/variants/sparkfun_thingplusrp2350/picow_digital.cpp
new file mode 100644
index 00000000..46879116
--- /dev/null
+++ b/variants/sparkfun_thingplusrp2350/picow_digital.cpp
@@ -0,0 +1,60 @@
+/*
+    pinMode and digitalRead/Write for the Raspberry Pi Pico W RP2040
+    Copyright (c) 2022 Earle F. Philhower, III <earlephilhower@yahoo.com>
+
+    This library is free software; you can redistribute it and/or
+    modify it under the terms of the GNU Lesser General Public
+    License as published by the Free Software Foundation; either
+    version 2.1 of the License, or (at your option) any later version.
+
+    This library is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+    Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public
+    License along with this library; if not, write to the Free Software
+    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+#include "Arduino.h"
+#include <pico/cyw43_arch.h>
+
+extern "C" void __pinMode(pin_size_t pin, PinMode mode);
+extern "C" void __digitalWrite(pin_size_t pin, PinStatus val);
+extern "C" PinStatus __digitalRead(pin_size_t pin);
+
+extern bool  __isPicoW;
+
+extern "C" void pinMode(pin_size_t pin, PinMode mode) {
+    if (!__isPicoW && (pin == PIN_LED)) {
+        pin = 25;  // Silently swap in the Pico's LED
+    }
+    if (pin < 32) {
+        __pinMode(pin, mode);
+    } else {
+        // TBD - There is no GPIO direction control in the driver
+    }
+}
+
+extern "C" void digitalWrite(pin_size_t pin, PinStatus val) {
+    if (!__isPicoW && (pin == PIN_LED)) {
+        pin = 25;  // Silently swap in the Pico's LED
+    }
+    if (pin < 32) {
+        __digitalWrite(pin, val);
+    } else {
+        cyw43_arch_gpio_put(pin - 32, val == HIGH ? 1 : 0);
+    }
+}
+
+extern "C" PinStatus digitalRead(pin_size_t pin) {
+    if (!__isPicoW && (pin == PIN_LED)) {
+        pin = 25;  // Silently swap in the Pico's LED
+    }
+    if (pin < 32) {
+        return __digitalRead(pin);
+    } else {
+        return cyw43_arch_gpio_get(pin - 32) ? HIGH : LOW;
+    }
+}
diff --git a/variants/sparkfun_thingplusrp2350/picow_init.cpp b/variants/sparkfun_thingplusrp2350/picow_init.cpp
new file mode 100644
index 00000000..1a2e77d6
--- /dev/null
+++ b/variants/sparkfun_thingplusrp2350/picow_init.cpp
@@ -0,0 +1,75 @@
+/*
+    Initialize the Pico W WiFi driver
+
+    Copyright (c) 2022 Earle F. Philhower, III <earlephilhower@yahoo.com>
+
+    This library is free software; you can redistribute it and/or
+    modify it under the terms of the GNU Lesser General Public
+    License as published by the Free Software Foundation; either
+    version 2.1 of the License, or (at your option) any later version.
+
+    This library is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+    Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public
+    License along with this library; if not, write to the Free Software
+    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+#include <pico/cyw43_arch.h>
+#include <pico/lwip_nosys.h>
+#include "hardware/resets.h"
+#include "hardware/gpio.h"
+#include "hardware/adc.h"
+
+#ifndef WIFICC
+#define WIFICC CYW43_COUNTRY_WORLDWIDE
+#endif
+
+// Taken from https://datasheets.raspberrypi.com/picow/connecting-to-the-internet-with-pico-w.pdf
+// also discussion in https://github.com/earlephilhower/arduino-pico/issues/849
+static bool CheckPicoW() {
+    adc_init();
+    auto dir = gpio_get_dir(29);
+    auto fnc = gpio_get_function(29);
+    adc_gpio_init(29);
+    adc_select_input(3);
+    auto adc29 = adc_read();
+    gpio_set_function(29, fnc);
+    gpio_set_dir(29, dir);
+
+    dir = gpio_get_dir(25);
+    fnc = gpio_get_function(25);
+    gpio_init(25);
+    gpio_set_dir(25, GPIO_IN);
+    auto gp25 = gpio_get(25);
+    gpio_set_function(25, fnc);
+    gpio_set_dir(25, dir);
+
+    if (gp25) {
+        return true; // Can't tell, so assume yes
+    } else if (adc29 < 200) {
+        return true; // PicoW
+    } else {
+        return false;
+    }
+}
+
+bool __isPicoW = true;
+
+extern "C" void initVariant() {
+    __isPicoW = CheckPicoW();
+    if (__isPicoW) {
+        cyw43_arch_init_with_country(WIFICC);
+    }
+}
+
+extern "C" void __lockBluetooth() {
+    async_context_acquire_lock_blocking(cyw43_arch_async_context());
+}
+
+extern "C" void __unlockBluetooth() {
+    async_context_release_lock(cyw43_arch_async_context());
+}
diff --git a/variants/sparkfun_thingplusrp2350/pins_arduino.h b/variants/sparkfun_thingplusrp2350/pins_arduino.h
new file mode 100644
index 00000000..13331486
--- /dev/null
+++ b/variants/sparkfun_thingplusrp2350/pins_arduino.h
@@ -0,0 +1,57 @@
+#pragma once
+
+extern bool __isPicoW;
+
+#ifdef __cplusplus
+extern "C" {
+#endif // __cplusplus
+extern void __lockBluetooth();
+extern void __unlockBluetooth();
+#ifdef __cplusplus
+}; // extern "C"
+#endif // __cplusplus
+
+// LEDs
+#define PIN_LED        (32u)
+
+#define PIN_NEOPIXEL   (14)
+#define NUM_NEOPIXEL   (1)
+
+// Serial
+#define PIN_SERIAL1_TX (0u)
+#define PIN_SERIAL1_RX (1u)
+
+#define PIN_SERIAL2_TX (31u)
+#define PIN_SERIAL2_RX (31u)
+
+// SPI
+#define PIN_SPI0_MISO  (4u)
+#define PIN_SPI0_MOSI  (3u)
+#define PIN_SPI0_SCK   (2u)
+#define PIN_SPI0_SS    (9u) // CS pin for SD card
+
+#define PIN_SPI1_MISO  (31u)
+#define PIN_SPI1_MOSI  (31u)
+#define PIN_SPI1_SCK   (31u)
+#define PIN_SPI1_SS    (31u)
+
+// Wire
+#define PIN_WIRE0_SDA  (6u)
+#define PIN_WIRE0_SCL  (7u)
+
+#define PIN_WIRE1_SDA  (31u)
+#define PIN_WIRE1_SCL  (31u)
+
+// Thing Plus uses I2C for Qwiic connector, make that the default
+#ifndef __WIRE0_DEVICE
+#define __WIRE0_DEVICE i2c1
+#endif
+#ifndef __WIRE1_DEVICE
+#define __WIRE1_DEVICE i2c0
+#endif
+
+#define SERIAL_HOWMANY (3u)
+#define SPI_HOWMANY    (1u)
+#define WIRE_HOWMANY   (1u)
+
+#include "../generic/common.h"