pico hid: uart support

hid/pico/src/CMakeLists.txt

@@ -9,6 +9,7 @@ target_sources(${target_name} PRIVATE
 	ph_usb_mouse.c
 	ph_cmds.c
 	ph_spi.c
+	ph_uart.c
 	ph_debug.c
 )
 target_link_options(${target_name} PRIVATE -Xlinker --print-memory-usage)

hid/pico/src/main.c

@@ -29,11 +29,21 @@
 #include "ph_outputs.h"
 #include "ph_usb.h"
 #include "ph_spi.h"
+#include "ph_uart.h"
 #include "ph_proto.h"
 #include "ph_cmds.h"
 #include "ph_debug.h"
 
 
+#define _COMM_PIN 22
+
+
+static bool _comm_use_spi = true;
+#define _COMM(x_func, ...) { \
+		if (_comm_use_spi) { ph_spi_##x_func(__VA_ARGS__); } \
+		else { ph_uart_##x_func(__VA_ARGS__); } \
+	}
+
 static bool _reset_required = false;
 
 
@@ -93,28 +103,37 @@ static void _send_response(u8 code) {
 
 	ph_split16(ph_crc16(resp, 6), &resp[6], &resp[7]);
 
-	ph_spi_write(resp);
+	_COMM(write, resp);
 
 	if (_reset_required) {
 		watchdog_reboot(0, 0, 100); // Даем немного времени чтобы отправить ответ, а потом ребутимся
 	}
 }
 
-static void _spi_data_handler(const u8 *data) {
+static void _data_handler(const u8 *data) {
 	_send_response(_handle_request(data));
 }
 
+static void _timeout_handler(void) {
+	_send_response(PH_PROTO_RESP_TIMEOUT_ERROR);
+}
+
 
 int main(void) {
 	ph_debug_init(false); // No UART
 	ph_outputs_init();
 	ph_usb_init();
-	ph_spi_init(_spi_data_handler);
+
+	gpio_init(_COMM_PIN);
+	gpio_set_dir(_COMM_PIN, GPIO_IN);
+	gpio_pull_up(_COMM_PIN);
+	_comm_use_spi = !gpio_get(_COMM_PIN);
+	_COMM(init, _data_handler, _timeout_handler);
 
 	while (true) {
 		ph_usb_task();
 		if (!_reset_required) {
-			ph_spi_task();
+			_COMM(task);
 			ph_debug_act_pulse(100);
 		}
 	}

hid/pico/src/ph_outputs.c

@@ -48,7 +48,7 @@ static int _read_outputs(void);
 
 
 void ph_outputs_init(void) {
-#	define INIT_SWITCH(x_pin) { gpio_init(x_pin); gpio_set_dir(x_pin, GPIO_IN); gpio_pull_down(x_pin); }
+#	define INIT_SWITCH(x_pin) { gpio_init(x_pin); gpio_set_dir(x_pin, GPIO_IN); gpio_pull_up(x_pin); }
 	INIT_SWITCH(_PS2_ENABLED_PIN);
 	INIT_SWITCH(_PS2_SET_KBD_PIN);
 	INIT_SWITCH(_PS2_SET_MOUSE_PIN);
@@ -59,14 +59,14 @@ void ph_outputs_init(void) {
 	INIT_SWITCH(_USB_SET_MOUSE_W98_PIN);
 #	undef INIT_SWITCH
 
-	const bool o_ps2_enabled = gpio_get(_PS2_ENABLED_PIN);
+	const bool o_ps2_enabled = !gpio_get(_PS2_ENABLED_PIN); // Note: all pins are pulled up!
-	const bool o_ps2_kbd = gpio_get(_PS2_SET_KBD_PIN);
+	const bool o_ps2_kbd = !gpio_get(_PS2_SET_KBD_PIN);
-	const bool o_ps2_mouse = gpio_get(_PS2_SET_MOUSE_PIN);
+	const bool o_ps2_mouse = !gpio_get(_PS2_SET_MOUSE_PIN);
 
-	const bool o_usb_disabled = gpio_get(_USB_DISABLED_PIN);
+	const bool o_usb_disabled = !gpio_get(_USB_DISABLED_PIN);
-	const bool o_usb_enabled_w98 = gpio_get(_USB_ENABLE_W98_PIN);
+	const bool o_usb_enabled_w98 = !gpio_get(_USB_ENABLE_W98_PIN);
-	const bool o_usb_mouse_rel = gpio_get(_USB_SET_MOUSE_REL_PIN);
+	const bool o_usb_mouse_rel = !gpio_get(_USB_SET_MOUSE_REL_PIN);
-	const bool o_usb_mouse_w98 = gpio_get(_USB_SET_MOUSE_W98_PIN);
+	const bool o_usb_mouse_w98 = !gpio_get(_USB_SET_MOUSE_W98_PIN);
 
 	int outputs = _read_outputs();
 	if (outputs < 0) {

hid/pico/src/ph_spi.c

@@ -51,8 +51,9 @@ static void (*_data_cb)(const u8 *) = NULL;
 static void _xfer_isr(void);
 
 
-void ph_spi_init(void (*data_cb)(const u8 *)) {
+void ph_spi_init(void (*data_cb)(const u8 *), void (*timeout_cb)(void)) {
 	_data_cb = data_cb;
+	(void)timeout_cb;
 
 	spi_init(_BUS, _FREQ);
 	spi_set_slave(_BUS, true);

hid/pico/src/ph_spi.h

@@ -25,6 +25,6 @@
 #include "ph_types.h"
 
 
-void ph_spi_init(void (*data_cb)(const u8 *));
+void ph_spi_init(void (*data_cb)(const u8 *), void (*timeout_cb)(void));
 void ph_spi_task(void);
 void ph_spi_write(const u8 *data);

hid/pico/src/ph_uart.c

@@ -0,0 +1,75 @@
+/*****************************************************************************
+#                                                                            #
+#    KVMD - The main PiKVM daemon.                                           #
+#                                                                            #
+#    Copyright (C) 2018-2023  Maxim Devaev <mdevaev@gmail.com>               #
+#                                                                            #
+#    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 <https://www.gnu.org/licenses/>.  #
+#                                                                            #
+*****************************************************************************/
+
+
+#include "ph_uart.h"
+
+#include "pico/stdlib.h"
+#include "hardware/gpio.h"
+#include "hardware/uart.h"
+
+#include "ph_types.h"
+
+
+#define _BUS		uart1
+#define _SPEED		115200
+#define _RX_PIN		21
+#define _TX_PIN		20
+#define _TIMEOUT_US	100000
+
+
+static u8 _buf[8] = {0};
+static u8 _index = 0;
+static u64 _last_ts = 0;
+
+static void (*_data_cb)(const u8 *) = NULL;
+static void (*_timeout_cb)(void) = NULL;
+
+
+void ph_uart_init(void (*data_cb)(const u8 *), void (*timeout_cb)(void)) {
+	_data_cb = data_cb;
+	_timeout_cb = timeout_cb;
+	uart_init(_BUS, _SPEED);
+	gpio_set_function(_RX_PIN, GPIO_FUNC_UART);
+	gpio_set_function(_TX_PIN, GPIO_FUNC_UART);
+}
+
+void ph_uart_task(void) {
+	if (uart_is_readable(_BUS)) {
+		_buf[_index] = (u8)uart_getc(_BUS);
+		if (_index == 7) {
+			_data_cb(_buf);
+			_index = 0;
+		} else {
+			_last_ts = time_us_64();
+			++_index;
+		}
+	} else if (_index > 0) {
+		if (_last_ts + _TIMEOUT_US < time_us_64()) {
+			_timeout_cb();
+			_index = 0;
+		}
+	}
+}
+
+void ph_uart_write(const u8 *data) {
+	uart_write_blocking(_BUS, data, 8);
+}

hid/pico/src/ph_uart.h

@@ -0,0 +1,30 @@
+/*****************************************************************************
+#                                                                            #
+#    KVMD - The main PiKVM daemon.                                           #
+#                                                                            #
+#    Copyright (C) 2018-2023  Maxim Devaev <mdevaev@gmail.com>               #
+#                                                                            #
+#    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 <https://www.gnu.org/licenses/>.  #
+#                                                                            #
+*****************************************************************************/
+
+
+#pragma once
+
+#include "ph_types.h"
+
+
+void ph_uart_init(void (*data_cb)(const u8 *), void (*timeout_cb)(void));
+void ph_uart_task(void);
+void ph_uart_write(const u8 *data);