From 73b8f85816c3209f6213e358a0d3737c7a73d45f Mon Sep 17 00:00:00 2001 From: Dimitris Papavasiliou Date: Fri, 5 Mar 2021 20:25:20 +0200 Subject: [Keyboard] Lagrange handwired keyboard (#11374) * [Keyboard] Add the Lagrange keyboard * Covert the master side to use the SPI driver. --- keyboards/handwired/lagrange/lagrange.c | 59 +++++++++++++++++++++++++++++++++ 1 file changed, 59 insertions(+) create mode 100644 keyboards/handwired/lagrange/lagrange.c (limited to 'keyboards/handwired/lagrange/lagrange.c') diff --git a/keyboards/handwired/lagrange/lagrange.c b/keyboards/handwired/lagrange/lagrange.c new file mode 100644 index 0000000000..0c76512c57 --- /dev/null +++ b/keyboards/handwired/lagrange/lagrange.c @@ -0,0 +1,59 @@ +/* Copyright 2020 Dimitris Papavasiliou + * + * This program is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see . + */ + +#include + +#include "lagrange.h" + +#ifndef SPLIT_USB_TIMEOUT_POLL +# define SPLIT_USB_TIMEOUT_POLL 10 +#endif + +/* Instead of timing out, the slave waits indefinitely for the other + * side to signal that it has become master. This avoids both sides + * assuming the slave role when the USB port is powered but not + * otherwise active (e.g. when the host is turned off, or suspended). + * The SPI SS line is used for signaling. On power-up it is + * configured as input with pull-up enabled. When one side assumes + * the master role, it reconfigures the line for SPI, and pulls it low + * to select the slave, which doubles as the signal. */ + +bool is_keyboard_master(void) { + static int8_t is_master = -1; + + if (is_master < 0) { + while (readPin(SPI_SS_PIN)) { + if (USB_Device_IsAddressSet()) { + is_master = 1; + return is_master; + } + wait_ms(SPLIT_USB_TIMEOUT_POLL); + } + + is_master = 0; + + USB_Disable(); + USB_DeviceState = DEVICE_STATE_Unattached; + } + + return is_master; +} + +void keyboard_pre_init_kb(void) { + setPinInputHigh(SPI_SS_PIN); + + keyboard_pre_init_user(); +} -- cgit v1.2.3