Does this still work at all with latest Pi OS images?

[clickworkorange]

I'm trying to upgrade to Pi OS "bookworm" but the Monarco hat seems to have gone AWOL; both the 1-wire interface and the RTC are missing from i2cdetect -y 1:

     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:                         -- -- -- -- -- -- -- -- 
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
50: -- -- -- 53 -- -- -- -- -- -- -- -- -- -- -- -- 
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
70: -- -- -- -- -- -- -- --

I would expect to see these devices as 0x6f and 0x18 respectively. Also the EEPROM is absent, which should be on 0x57 - perhaps this is the root cause? 0x53 is an accelerometer that also hangs off i2c-1, this is working as it should, so there's nothing wrong with the i2c bus itself.

[clickworkorange]

Curiously, they do show up in /sys:

$ ls /sys/bus/i2c/devices/
10-0036  1-0018  1-006f  i2c-0  i2c-1  i2c-10  i2c-11

$ cat /sys/bus/i2c/devices/*/name
ov5647
ds2482
mcp7941x
i2c-11-mux (chan_id 0)
i2c-11-mux (chan_id 1)
bcm2835 (i2c@7e205000)
bcm2835 (i2c@7e804000)

[clickworkorange]

Trying to run the flash updater with kernel 6.6 I get a write error on /sys/class/gpio:

./monarco-flash.pl flash ./firmware-bin/fw-monarco-hat-2008.bin
Monarco HAT Flash Firmware Downloader, version 1.1
(c) REX Controls 2016, http://www.rexcontrols.com

HAT ID detected:
  Vendor: REX Controls
  Product: Monarco HAT
  Product ID: 0x0001
  Product VER: 0x1105
  UUID: fe0f39bf-7c03-4eb6-9a91-df861ae5abcd

Serial device /dev/ttyAMA0 check OK.

write error at ./monarco-flash.pl line 293.
	main::file_write("/sys/class/gpio/export", 21) called at ./monarco-flash.pl line 261
	main::gpio_init() called at ./monarco-flash.pl line 158

This is most likely caused by the reorganisation of /sys/class/gpio introduced in kernel 6.6: raspberrypi/linux#6037 - the updater still works fine with 6.1:

$ sudo ./monarco-flash.pl flash ./firmware-bin/fw-monarco-hat-2008.bin
Monarco HAT Flash Firmware Downloader, version 1.1
(c) REX Controls 2016, http://www.rexcontrols.com

HAT ID detected:
  Vendor: REX Controls
  Product: Monarco HAT
  Product ID: 0x0001
  Product VER: 0x1105
  UUID: fe0f39bf-7c03-4eb6-9a91-df861ae5abcd

Serial device /dev/ttyAMA0 check OK.

MCU Bootloader ID: [1.60 ChipID: 247DBC0658172069]

Press ENTER to continue ...
XModem: Start, waiting for handshake
XModem: Handshake success
XModem: Sending: ...............................................................................................................................................................................

CRC RESULT: [18] c--CRC: 00009D4D--

OK!

[clickworkorange]

It seems the hat EEPROM is being read, since it activates both the i2c and spi buses even when these are not enabled in /boot/firmware/config.txt. I'm not sure if the last bit works though, where it remaps uart0&1:

https://github.com/monarco/monarco-hat-firmware-bin/blob/master/device-tree/monarco-hat-4-9.dts#L53-L98

I also see

$ ls /proc/device-tree/hat/
name  product  product_id  product_ver  uuid  vendor

$ cat /proc/device-tree/hat/product
Monarco HAT

But with no changes to my /boot/firmware/config.txt I see a /dev/serial0 device whereas I think the hat EEPROM should change this to /dev/serial1?

[clickworkorange]

I've downloaded the Rexygen Bookworm image and had a poke around in it, to see if you're doing anything special to get the Monarco Hat working, but I don't spot anything obvious... Still, I'm encouraged that it even exists - that means the hat should work on my set-up as well.

[clickworkorange]

I see your Rexygen Bookworm image is 32-bit:

# less /media/me/rootfs/etc/apt/sources.list
deb [ arch=armhf ] http://raspbian.raspberrypi.com/raspbian/ bookworm main contrib non-free rpi

Whereas I'm running 64-bit PiOS Bookworm - could that be the issue?

[clickworkorange]

Here's how the GPIOs are configured on the Pi in question:

$ pinctrl
 0: a0    -- | hi // ID_SDA/GPIO0 = SDA0
 1: a0    -- | hi // ID_SCL/GPIO1 = SCL0
 2: a0    -- | hi // SDA1/GPIO2 = SDA1
 3: a0    -- | hi // SCL1/GPIO3 = SCL1
 4: ip    -- | hi // GPIO_GCLK/GPIO4 = input
 5: ip    -- | hi // GPIO5 = input
 6: ip    -- | hi // GPIO6 = input
 7: op -- -- | hi // SPI_CE1_N/GPIO7 = output
 8: op -- -- | hi // SPI_CE0_N/GPIO8 = output
 9: a0    -- | lo // SPI_MISO/GPIO9 = SPI0_MISO
10: a0    -- | lo // SPI_MOSI/GPIO10 = SPI0_MOSI
11: a0    -- | lo // SPI_SCLK/GPIO11 = SPI0_SCLK
12: ip    -- | lo // GPIO12 = input
13: op -- -- | hi // GPIO13 = output
14: a0    -- | hi // TXD1/GPIO14 = TXD0
15: a0    -- | hi // RXD1/GPIO15 = RXD0
16: ip    -- | lo // GPIO16 = input
17: ip    -- | lo // GPIO17 = input
18: ip    -- | lo // GPIO18 = input
19: ip    -- | lo // GPIO19 = input
20: ip    -- | lo // GPIO20 = input
21: ip    -- | hi // GPIO21 = input
22: ip    -- | lo // GPIO22 = input
23: ip    -- | lo // GPIO23 = input
24: ip    -- | lo // GPIO24 = input
25: ip    -- | lo // GPIO25 = input
26: ip    -- | hi // GPIO26 = input
27: ip    -- | lo // GPIO27 = input
28: ip    -- | hi // HDMI_HPD_N/GPIO28 = input
29: op -- -- | lo // STATUS_LED_G/GPIO29 = output
30: ip    -- | hi // CTS0/GPIO30 = input
31: ip    -- | hi // RTS0/GPIO31 = input
32: ip    -- | hi // TXD0/GPIO32 = input
33: ip    -- | hi // RXD0/GPIO33 = input
34: ip    -- | hi // SD1_CLK/GPIO34 = input
35: ip    -- | hi // SD1_CMD/GPIO35 = input
36: ip    -- | hi // SD1_DATA0/GPIO36 = input
37: ip    -- | hi // SD1_DATA1/GPIO37 = input
38: ip    -- | hi // SD1_DATA2/GPIO38 = input
39: ip    -- | hi // SD1_DATA3/GPIO39 = input
40: a0    -- | lo // PWM0_OUT/GPIO40 = PWM0
41: a0    -- | lo // PWM1_OUT/GPIO41 = PWM1
42: a0    -- | lo // ETH_CLK/GPIO42 = GPCLK1
43: a0    -- | lo // WIFI_CLK/GPIO43 = GPCLK2
44: ip    -- | hi // SDA0/GPIO44 = input
45: ip    -- | hi // SCL0/GPIO45 = input
46: ip    -- | hi // SMPS_SCL/GPIO46 = input
47: op -- -- | hi // SMPS_SDA/GPIO47 = output
48: a0    -- | lo // SD_CLK_R/GPIO48 = SD0_CLK
49: a0    -- | hi // SD_CMD_R/GPIO49 = SD0_CMD
50: a0    -- | hi // SD_DATA0_R/GPIO50 = SD0_DAT0
51: a0    -- | hi // SD_DATA1_R/GPIO51 = SD0_DAT1
52: a0    -- | hi // SD_DATA2_R/GPIO52 = SD0_DAT2
53: a0    -- | hi // SD_DATA3_R/GPIO53 = SD0_DAT3

Looks correct to me?

[clickworkorange]

Loaded i2c modules:

$ lsmod | grep i2c
i2c_dev                20480  14
regmap_i2c             16384  1 rtc_ds1307
i2c_mux_pinctrl        16384  0
i2c_mux                16384  1 i2c_mux_pinctrl
i2c_bcm2835            20480  8

[clickworkorange]

Trying to read from the RTC and 1-Wire controller with i2cget fails:

$ i2cget -f 1 0x6f 
WARNING! This program can confuse your I2C bus, cause data loss and worse!
I will read from device file /dev/i2c-1, chip address 0x6f, current data
address, using read byte.
Continue? [Y/n] 
Error: Read failed

$ i2cget -f 1 0x18 
WARNING! This program can confuse your I2C bus, cause data loss and worse!
I will read from device file /dev/i2c-1, chip address 0x18, current data
address, using read byte.
Continue? [Y/n] 
Error: Read failed