Hello @fkarner

I get SimStatus: 1 when SIM card is installed and recognized. (I get SimStatus: 0 if I remove the SIM card.)

So yes, it appears that something is either wrong with the SIM card you are using or with the sim card slot in the DTU.

Thanks
Felix

Hello @ewoodier84

hmm, I am not seeing that. I get to select from all three buttons in UIFlow2 V2.2.3 with M5Core2 selected.

The same is true when I load some of my older UIFlow2 programs.

Which browser are you using? I think UIFlow2 only works properly in Chrome. Maybe try to clear the cache?

Thanks
Felix

Hello @fkarner

I get the same error, but it's not fatal. The error stems from the fact that in ATOM_DTU_NB.h a GPIO is defined, e.g.

#define ATOM_DTU_SIM7020_RESET -1

for the SIM7020 reset which isn't connected in the DTU.
If you change that to something like 13 the error goes away.

The program is probably stuck in Inititalzing modem as it tries to check for the SIM card and that it doesn't have a PIN defined.

Have you double-checked that the SIM card is placed in the correct orientation and that it doesn't use a PIN?

Thanks
Felix

Hello @s1y99

reading your other post, I think you already figured that out yourself. It's not possible to jumper LoRa V1.1 so the same GPIOs are used as it were for the older LoRa module.

Both LoRa modules use the same GPIOs for MOSI (23), MISO (19) and SCK (18). However RST and IRQ cannot be jumpered the same; CS/NSS can be jumpered the same.

LoRa (433 old): RST(26), IRQ (36), CS/NSS (5)
LoRa V1.1: RST(25/13), IRQ (35/34), CS/NSS (0, 15, 12, 5)

Note: GPIO numbers above are for an M5Core (Basic).

Please also see schematics here and here.

Just curious. What is preventing you from modifying your firmware to use the GPIOs of the newer LoRa module?

Thanks
Felix

Hello @desmbr

have you checked the boot option? In M5Burner click onto the Configure (yellow) button and then set Boot Option to Show startup menu and network setup. Then click onto Next to set the new boot option.

Thanks
Felix

Hello @fkarner

thank you for the update. So it's confirmed something's wrong with the first SIM7020G. I still suspect the baudrate got changed somehow, especially since you are writing that the LEDs behave normally.

Thanks
Felix

Hello @peolsolutions

just an FYI: M5Stack Fire doesn't have an AXP192 PMU.

I get the feeling some of your posts are AI generated, no? If I am correct I'd appreciate if you could first verify the technical facts before posting.

Thank you very much for your understanding.

Thanks
Felix

@kubeqq
Please follow this instruction and see if helps:

1. Observe whether there are any obvious physical damage marks on the device.
2. Install the device driver:
   1. Windows: https://m5stack.oss-cn-shenzhen.aliyuncs.com/resource/drivers/CH9102_VCP_SER_Windows.exe
   2. macOS: https://m5stack.oss-cn-shenzhen.aliyuncs.com/resource/drivers/CH9102_VCP_MacOS_v1.7.zip
3. Connect the device using a USB cable and open the device manager. Check whether the device manager page refreshes when the device is inserted, and whether a new device appears in Universal Serial Bus controllers. If not:
   1. If you are using USB C to C cable: First disconnect the StickCPlus2, turn off the device, and then plug in the cable (press and hold the power button until the green light turns on to indicate that it is turned off). Or replace it with an A to C cable.
   2. If you are using USB A to C cable: "Try to change the data cable", "Try to reinstall the driver", "Try to change the PC".
4. Reburn the factory firmware: https://docs.m5stack.com/en/guide/restore_factory/m5stickc_plus2.
5. The screen is still black after burning:
   1. Press and hold the leftmost button until the green light inside turns on, then plug in the USB cable
   2. Observe whether the screen is black but has a faint backlight, and whether there is a beep sound when pressing the button

Hello @wrs642

Note:

• port A (red) is by default I2C
• port B (black) is by default IN/OUT
• port C (blue) is by default UART

M5GoPlus2 has three port B, none of which is I2C. I2C is only available on MBUS (pins 21/22). Please check schematics here.

Thanks
Felix

Hello @davekc

M5Stamp-C3: PORT-U pins and USB-C are not the same. Check schematics here.

M5Stamp-C3U: PORT-U pins and USB-C are the same. Check schematics here.

Thanks
Felix