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pimoroni / automation-hat

Python library and examples for the Pimoroni Automation HAT, pHAT and HAT Mini
https://shop.pimoroni.com/products/automation-hat
MIT License
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Unable to use LCD Display on Automation Hat Mini #57

Closed fussel132 closed 7 months ago

fussel132 commented 7 months ago

Hi there,

I am not able to get the display to work. Neither the examples here nor the ones over at the st7735 library work. Using the proposed install script (after disabling the externally managed env) still delivers the old examples where 9 instead of "GPIO9" is used as dc parameter.

According to the pinout (found at https://pinout.xyz/pinout/automation_hat_mini), the config below should let me control the display:

# Create ST7735 LCD display class. disp = st7735.ST7735( port=0, cs=st7735.BG_SPI_CS_FRONT, dc="GPIO9", backlight="GPIO25", rotation=90, spi_speed_hz=4000000 )

However it always results in the following output:

Woah there, suitable gpiochip not found! ❌ GPIO9: not found - /dev/gpiochip1 (raspberrypi-exp-gpio)! ❌ GPIO9: not found - /dev/gpiochip0 (pinctrl-bcm2711)!

HELP! SPI is enabled via raspi-config. I am running the latest release of headless rpi os 64bit (debian bookworm) as of today on a RPi4 with 4GiB of RAM.

The output of gpioinfo looks like this (I am not an expert but the display isn't there I guess):

gpioinfo output > user@rpi:~ $ gpioinfo gpiochip0 - 58 lines: line 0: "ID_SDA" unused input active-high line 1: "ID_SCL" unused input active-high line 2: "SDA1" unused input active-high line 3: "SCL1" unused input active-high line 4: "GPIO_GCLK" unused input active-high line 5: "GPIO5" unused output active-high line 6: "GPIO6" unused output active-high line 7: "SPI_CE1_N" "spi0 CS1" output active-low [used] line 8: "SPI_CE0_N" "spi0 CS0" output active-low [used] line 9: "SPI_MISO" unused input active-high line 10: "SPI_MOSI" unused input active-high line 11: "SPI_SCLK" unused input active-high line 12: "GPIO12" unused output active-high line 13: "GPIO13" unused output active-high line 14: "TXD1" unused input active-high line 15: "RXD1" unused input active-high line 16: "GPIO16" unused output active-high line 17: "GPIO17" unused input active-high line 18: "GPIO18" unused input active-high line 19: "GPIO19" unused input active-high line 20: "GPIO20" unused input active-high line 21: "GPIO21" unused input active-high line 22: "GPIO22" unused input active-high line 23: "GPIO23" unused input active-high line 24: "GPIO24" unused input active-high line 25: "GPIO25" unused output active-high line 26: "GPIO26" unused input active-high line 27: "GPIO27" unused input active-high line 28: "RGMII_MDIO" unused input active-high line 29: "RGMIO_MDC" unused input active-high line 30: "CTS0" unused input active-high line 31: "RTS0" unused input active-high line 32: "TXD0" unused input active-high line 33: "RXD0" unused input active-high line 34: "SD1_CLK" unused input active-high line 35: "SD1_CMD" unused input active-high line 36: "SD1_DATA0" unused input active-high line 37: "SD1_DATA1" unused input active-high line 38: "SD1_DATA2" unused input active-high line 39: "SD1_DATA3" unused input active-high line 40: "PWM0_MISO" unused input active-high line 41: "PWM1_MOSI" unused input active-high line 42: "STATUS_LED_G_CLK" "ACT" output active-high [used] line 43: "SPIFLASH_CE_N" unused input active-high line 44: "SDA0" unused input active-high line 45: "SCL0" unused input active-high line 46: "RGMII_RXCLK" unused input active-high line 47: "RGMII_RXCTL" unused input active-high line 48: "RGMII_RXD0" unused input active-high line 49: "RGMII_RXD1" unused input active-high line 50: "RGMII_RXD2" unused input active-high line 51: "RGMII_RXD3" unused input active-high line 52: "RGMII_TXCLK" unused input active-high line 53: "RGMII_TXCTL" unused input active-high line 54: "RGMII_TXD0" unused input active-high line 55: "RGMII_TXD1" unused input active-high line 56: "RGMII_TXD2" unused input active-high line 57: "RGMII_TXD3" unused input active-high gpiochip1 - 8 lines: line 0: "BT_ON" "shutdown" output active-high [used] line 1: "WL_ON" unused output active-high line 2: "PWR_LED_OFF" "PWR" output active-low [used] line 3: "GLOBAL_RESET" unused output active-high line 4: "VDD_SD_IO_SEL" "vdd-sd-io" output active-high [used] line 5: "CAM_GPIO" "cam1_regulator" output active-high [used] line 6: "SD_PWR_ON" "sd_vcc_reg" output active-high [used] line 7: "SD_OC_N" unused input active-high
Gadgetoid commented 7 months ago

There are two potential gotchas here:

  1. "GPIO9" is named "SPI_MISO" on your board- so you can just swap "GPIO9" to "SPI_MISO" and it... should work
  2. "SPI_MISO" might be owned by the SPI driver, so it could complain about it being in use

Raspberry Pi are normalising the GPIO names between boards to help avoid things like this (see: https://github.com/raspberrypi/linux/pull/5902)

fussel132 commented 7 months ago

Hm ok so using SPI_MISO indeed helped resolving this issue. Slightly confusing but thanks a lot!