iCE40HX8K-EVB-EXT to 4 PMOD port adapter.

Soldering

Solder every SMD component. Measure if 5V gets regulates to 3V3.

Solder every through-hole component. Measure for shorts between any of the signal pins on the tiny 1.27 header J1, correct if needed.

Clean the PCB.

Pin mapping from PMOD to iCE40HX8K

Header on adapter (J2, J3, J4, J5 column) ➔ pin number on EXT connector (EXT column) ➔ FPGA pin when using EXTx (EXT1, EXT2, EXT3, EXT4 column) connector on FPGA board.

J2	EXT	EXT1	EXT2	EXT3	EXT4
1	14	A7	K12	D15	M5
2	18	D8	L13	F14	M4
3	22	F7	L12	D16	N3
4	26	F9	M13	E16	M3
7	12	C7	M16	F11	R1
8	16	B8	L14	F12	P2
9	20	B9	N16	G12	P1
10	24	C8	M14	G13	L5

J3	EXT	EXT1	EXT2	EXT3	EXT4
1	21	A16	E6	K16	N12
2	17	E11	A5	J15	M11
3	13	B14	A6	K13	E13
4	9	B15	C6	J11	F13
7	19	C13	B5	K15	T13
8	15	C12	D6	K14	D14
9	11	D13	D7	L16	B16
10	7	C14	B6	M15	C16

J4	EXT	EXT1	EXT2	EXT3	EXT4
1	35	B10	B3	H16	L1
2	31	D11	C5	H13	K3
3	27	E10	D5	J13	J1
4	23	A15	B4	J14	M12
7	37	B11	D4	H14	K4
8	33	B12	C4	H11	L4
9	29	C11	A1	J16	K1
10	25	B13	A2	J12	R16

J5	EXT	EXT1	EXT2	EXT3	EXT4
1	28	A9	P16	G14	M6
2	32	E9	P14	G11	L7
3	36	D10	R14	G10	K5
4	40	A10	D3	H12	L6
7	30	D9	P15	F15	N2
8	34	C9	R15	F16	M2
9	38	A11	C3	G15	L3
10	39	C10	E5	G16	M1