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Define CAN interrupt pins #1266

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merged 2 commits into from
Jan 26, 2024
Merged

Define CAN interrupt pins #1266

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13e9de1
rpi-config: Add CAN0_INTERRUPT_PIN and CAN1_INTERRUPT_PIN variable
dferrarigrowtech Jan 23, 2024
ee923c7
docs: add info on how to set different CAN interrupt pins
dferrarigrowtech Jan 23, 2024
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7 changes: 7 additions & 0 deletions docs/extra-build-config.md
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Original file line number Diff line number Diff line change
Expand Up @@ -340,6 +340,13 @@ Some modules may require setting the frequency of the crystal oscillator used on

CAN_OSCILLATOR="8000000"

Configure the interrupt pin to the one connected to the CAN module. By default,
the pins are set to 25 for can0 and 24 for can1. To change them to 12 and 16,
the following variables also have to be set:

CAN0_INTERRUPT_PIN = "12"
CAN1_INTERRUPT_PIN = "16"

Tested modules:

* PiCAN2 (16 MHz crystal): <http://skpang.co.uk/catalog/pican2-canbus-board-for-raspberry-pi-23-p-1475.html>
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8 changes: 5 additions & 3 deletions recipes-bsp/bootfiles/rpi-config_git.bb
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Expand Up @@ -30,6 +30,8 @@ GPIO_IR ?= "18"
GPIO_IR_TX ?= "17"

CAN_OSCILLATOR ?= "16000000"
CAN0_INTERRUPT_PIN ?= "25"
CAN1_INTERRUPT_PIN ?= "24"

ENABLE_UART ??= ""

Expand Down Expand Up @@ -268,12 +270,12 @@ do_deploy() {
# ENABLE DUAL CAN
if [ "${ENABLE_DUAL_CAN}" = "1" ]; then
echo "# Enable DUAL CAN" >>$CONFIG
echo "dtoverlay=mcp2515-can0,oscillator=${CAN_OSCILLATOR},interrupt=25" >>$CONFIG
echo "dtoverlay=mcp2515-can1,oscillator=${CAN_OSCILLATOR},interrupt=24" >>$CONFIG
echo "dtoverlay=mcp2515-can0,oscillator=${CAN_OSCILLATOR},interrupt=${CAN0_INTERRUPT_PIN}" >>$CONFIG
echo "dtoverlay=mcp2515-can1,oscillator=${CAN_OSCILLATOR},interrupt=${CAN1_INTERRUPT_PIN}" >>$CONFIG
# ENABLE CAN
elif [ "${ENABLE_CAN}" = "1" ]; then
echo "# Enable CAN" >>$CONFIG
echo "dtoverlay=mcp2515-can0,oscillator=${CAN_OSCILLATOR},interrupt=25" >>$CONFIG
echo "dtoverlay=mcp2515-can0,oscillator=${CAN_OSCILLATOR},interrupt=${CAN0_INTERRUPT_PIN}" >>$CONFIG
fi


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