# Please note that this is only a sample, we recommend you to change it to fit
# your needs.
# You should override this file using BR2_PACKAGE_RPI_FIRMWARE_CONFIG_FILE.
# See http://buildroot.org/manual.html#rootfs-custom
# and http://elinux.org/RPiconfig for a description of config.txt syntax

start_file=start.elf
fixup_file=fixup.dat

kernel=zImage

# To use an external initramfs file
#initramfs rootfs.cpio.gz

# Disable overscan assuming the display supports displaying the full resolution
# If the text shown on the screen disappears off the edge, comment this out
disable_overscan=1

# How much memory in MB to assign to the GPU on Pi models having
# 256, 512 or 1024 MB total memory
gpu_mem_256=100
gpu_mem_512=100
gpu_mem_1024=100

# Set I2C speed to 400kHz(Fast mode)
dtparam=i2c_arm=on,i2c_arm_baudrate=400000

# Enable spidev node
dtparam=spi=on

# Add PCF8574A GPIO expander
dtoverlay=pcf857x,pcf8574a,addr=0x38,interrupt=22

# Add DS3231 driver
dtoverlay=i2c-rtc,ds3231

# Add BME280 sensor
dtoverlay=i2c-sensor,bme280,addr=0x76

# PPS signal
dtoverlay=pps-gpio,gpiopin=17,capture_clear