“It comes with a read-only bootloader that can either mount as a USB mass storage device (firmware updates can just be copypasted to the "storage device")”

doing basic keyboard PCBs, the included bootloader makes it REALLY simple to work with (no worries about having to manage an ISP/SPI interface on top of everything else)

[–] TCB13@lemmy.world 2 points 4 months ago (1 children)

I really like Espressif:

	ESP8266	ESP32	ESP32-S2	ESP32-S3	ESP32-C3	ESP32-C6
Announcement Date	2014, August	2016, September	2019, September	2020, December	2020, November	2021, April
Main processor	Tensilica L106 32-bit (up to 160MHz)	Tensilica Xtensa 32-bit LX6 (up to 240MHz) (optionally dual core)	Tensilica Xtensa 32-bit LX7 (up to 240MHz)	Tensilica Xtensa 32-bit LX7 dual core (up to 240MHz)	RISC-V 32-bit (up to 160MHz)	RISC-V 32-bit (up to 160MHz)
SRAM	160KB	520KB	320KB	512KB	400KB	400KB
ROM	0	448KB	128KB	384KB	384KB	384KB
JTAG	X	✓	✓	?	✓	✓
Cache	32 KB instruction	64KB	8/16KB (configurable)	?	16KB	?
WiFi	Wi-Fi 4 (only up to 72.2Mbps)	Wi-Fi 4	Wi-Fi 4	Wi-Fi 4	Wi-Fi 4	Wi-Fi 6
Bluetooth	X	BLE 4.2 (upgrade to 5.0, with limitations)	X	BLE 5.0	BLE 5.0	BLE 5.0
Ethernet	X	✓	X	?	X	?
RTC memory	768B	16KB	16KB	16KB	8KB	?
PMU	✓	✓	✓	?	✓	?
ULP coprocessor	X	✓	ULP-RISC-V	?	X	?
Cryptographic Accelerator	X	SHA, RSA, AES, RNG	SHA, RSA, AES, RNG, HMAC, Digital Signature	SHA, RSA, AES, RNG, HMAC, Digital Signature	SHA, RSA, AES, RNG, HMAC, Digital Signature	SHA, RSA, AES, RNG, HMAC, Digital Signature
Secure boot	X	✓	✓	✓	✓	✓
Flash encryption	X	✓	XTS-AES-128/256	✓	XTS-AES-128	XTS-AES-128
SPI	2	4	4	?	3	?
I2C	1	2	2	?	1	?
I2S	1	2	1	?	1	?
UART	2 (one TX only)	3	2	?	2	?
SDIO Host	0	1	0	2	0	0
SDIO Slave	0	1	0	0	0	0
GPIO	17	34	43	44	22	22
LED PWM	5	16	8	?	6	?
MCPWM	0	6	0	2	0	0
Pulse counter	0	8	4	?	0	X
GDMA*	0	0	0	?	6	?
USB	X	X	USB OTG 1.1	?	Serial/JTAG	?
TWAI**	0	1	1	?

[–] h3ndrik@feddit.de 2 points 4 months ago* (last edited 4 months ago)

~~The chips after the esp8266 are also very nice 😊~~

Edit: Don't mind. I was on mobile and only saw the first column.

The ESPs are really nice. Affordable, nice peripherals and plenty of them. Wifi and Bluetooth are a dream come true for IoT stuff. And they come with crazy amounts of RAM. Like 520kB is plenty. And with the PSRAM we can also fit in seconds of webradio buffer, images and whatever. Also the newer ones also have USB so you can just mount them on the PC and drag and drop Python programs.

I have at least a dozen of them.