RTL8721DM pins

Every GPIO bonded out on the RTL8721DM's QFN68 package, one row each, with one column per device. It is a reference for porting Wellfed to a board.

The same pin often does different jobs on different boards. PA25 is the buzzer on the PLAF103 and an RFID UART line on the AF301, so a role in one column says nothing about another. Each role carries its evidence level.

Sources#

• Bonded pins (External). The 34 GPIOs come from earlynerd's AF301 pin map, which checked them against the datasheet's package figure and a live chip. Every pin the PLAF103 uses is in that list.
• Pins to avoid (External). The same project reports that PB13, PB14, PB16 and PB17 fault in the SDK's gpio_init and are readable only through the ROM, and that re-muxing the internal flash pads hangs execute-in-place.
• Peripheral functions (Recovered). The UART, ADC and PWM columns are the SDK HAL pin tables at the pinned revision (component/common/mbed/targets/hal/rtl8721d/: serial_api.c, analogin_api.c, pwmout_api.c). The pinmux supports more functions (I²C, SPI, I²S, keyscan, captouch) than these tables list. Check rtl8721d_pinmux.h and the datasheet before you rely on a pin's absence here.
• SDK number is (port << 5) | pin (chip). PA7/PA8 are the LOGUART.

Table#

A dash in a device column means that device's docs record no role. It does not mean the pin is unused. The PLAF103's details, open questions and stock instruction anchors are on its board page.