Support for ZG-227Z

[h3ifri]

I received a couple ZG-227Z devices, labeled on the sticker as HZ-HT-03. The sensor is an AHT20.

Is it possible to support this device?

[h3ifri]

This should be the pin mapping:

// TLSR8253F512ET32 (ZG-227ZS)
// (03) GPIO_PA0 - free
// (04) GPIO_PA1 - free
// (05) GPIO_PA7 - SWS, free, header
// (06) GPIO_PB1 - UART_TX, free, header
// (14) GPIO_PB4 - free
// (15) GPIO_PB5 - free
// (16) GPIO_PB6 - free
// (17) GPIO_PB7 - UART_RX, free, header
// (20) GPIO_PC0 - SDA, used I2C AHT20
// (21) GPIO_PC1 - SCL, used I2C AHT20
// (22) GPIO_PC2 - LED (->GND)
// (23) GPIO_PC3 - free?
// (24) GPIO_PC4 - free?
// (31) GPIO_PD2 - free
// (32) GPIO_PD3 - free
// (01) GPIO_PD4 - KEY (->GND)
// (02) GPIO_PD7 - free

I'm unsure about PC3/PC4, they are connected to vias, but I can't trace them without unsoldering the PCB.

[h3ifri]

I unsoldered the PCB:

// (20) GPIO_PC0 - free
// (21) GPIO_PC1 - free
// (22) GPIO_PC2 - LED (->GND)
// (23) GPIO_PC3 - SDA
// (24) GPIO_PC4 - SCL

I2C is on PC3/PC4, which has no hardware support for it.

So this device is useless?

[pvvx]

For example, lktmzl02 uses a software implementation of I2C.

[h3ifri]

After a quick look, this is outside my skill set... I will try to rewire the sensor to PC0/PC1 :)