ULX4M-CM4-HAT

On V1 we have FTDI to FPGA working and we can upload bitstream to FPGA, serial passtrue is also working. For some reason it was hard to put ESP32 into bootloader mode, and I was not able to load micropython while shiled was connected to FPGA. After doing that directly (bricking pins on shield FTDI TX > ESP32 RX, ESP32 TX > FTDI RX, GPIO0 > GND) I have succesfully loaded micropython on ESP32. WROOM is still not perfect fit as it has low memory. WROWER can access shared SD card, and flash FPGA over WIFI.

Current pinout

cm4_gpio	wifi_gpio	HAT function	FPGA	FPGA
0	21	SDA0	P17
1	22	SCL0	P16
2	12	SD_D2	K1	K5
3	4	SD_D1	H1	J5
4	2	SD_D0	J3	K4
5	33		H16
6		BTN1	R1
7		BTN2	P3
8	19		P4
9	27		G16
10	26		N17
11	25		L16
12	23	TDI	R5
13		FTDI_TXDEN	T1
14	13	SD_D3	K2	L4
15	14	SD_CLK	H2	L5
16	34	TDO	V4
17	35		N17
18		LED1	N5
19	0	BOOT_PULL_UP	U1
20	18	TCK	T5
21	5	TMS	U5
22	EN	WIFI_EN	U18
23		FTDI_TXD	N4
24		FTDI_RX	N3
25	RXD0	WIFI_RDX	P5
26	TXD0	WIFI_TXD	V1
27	15	SD_CMD	J1	N16

ToDo

• FTDI chip
• USB
• FTDI JTAG connected to FPGA
• FTDI UART connected to FPGA
• ESP32 UART connected to FPGA
• ESP32 connected to SD card that is connected to FPGA ( SD card sharing )
• LEDS
• BTNS
• USBC
• 8 LEDs
• 8 BTNs
• ESP32 WROM
• ESP32 WROVER
• ESP32 S2
• ESP32 S3
• FT4232
• USB A host connector connected directly to FPGA
• I2S Audio
• Audio amplifier
• PMOD connector/connectors