ADXL345 to SKR SPI

	A	B	C	D	E	F
1	https://www.klipper3d.org/Measuring_Resonances.html
2	ADXL345 pin	RPi pin	RPi pin name	SKR pin	color
3	3V3 (or VCC)	1	3.3v DC power	SWD1	red
4	GND	6	Ground	6	black
5	CS	24	GPIO08 (SPI0_CE0_N)	5	blue
6	SDO	21	GPIO09 (SPI0_MISO)	1	green
7	SDA	19	GPIO10 (SPI0_MOSI)	4	yellow
8	SCL	23	GPIO11 (SPI0_SCLK)	3	orange
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14	https://github.com/bigtreetech/BIGTREETECH-SKR-V1.3/blob/master/BTT%20SKR%20V1.4/Hardware/BTT%20SKR%20V1.4PIN.pdf
15	SPI header pin	PIN name	color
16	1	0.8-MISO1	green	SPI connector:
17		SWD1	red	blue / CS	orange / SCL	green / SDO
18	3	0.7-SCK1	orange	black / GND	yellow / SDA
19	4	0.9-MOSI1	yellow
20	5	P0.26 (CS)	blue
21	6	GND	black
22
23	klipper config:
24	[adxl345] spi_bus: ssp1 cs_pin: P0.26 [resonance_tester] accel_chip: adxl345 probe_points: 150,150,20
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26	https://github.com/bigtreetech/BIGTREETECH-SKR-V1.3/blob/master/BTT%20SKR%20V1.3/hardware/SKR-V1.3-PIN.pdf
27	This version works with both SKR 1.3 and SKR 1.4.
28	EXP2 header pin	PIN name	color
29	10	0.17-MISO0	green
30	3.3V	SWD1 (SKR1.4) or ICSP2 (SKR1.3)	red	EXP2 connector:
31	9	0.15-SCK0	orange		black / GND
32	5	0.18-MOSI0	yellow
33	7	0.16-SSEL0 (CS)	blue	yellow / SDA
34	2	GND	black	blue / CS
35				orange / SCL	green / SDO
36	klipper config:
37	[adxl345] spi_bus: ssp0 cs_pin: P0.16 [resonance_tester] accel_chip: adxl345 probe_points: 150,150,20
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