Initial commit of 1 port USB relay firmware

[usb-relay-firmware.git] / main.c

diff --git a/main.c b/main.c
new file mode 100644 (file)
index 0000000..920db3e
--- /dev/null
+++ b/main.c
@@ -0,0 +1,166 @@
+/*
+ * Basic firmware for www.dcttech.com 1 port USB Relay
+ *
+ * Copyright 2016 Jonathan McDowell <noodles@earth.li>
+ *
+ * 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 <http://www.gnu.org/licenses/>.
+ */
+#include <avr/eeprom.h>
+#include <avr/interrupt.h>
+#include <avr/io.h>
+#include <avr/wdt.h>
+#include <util/delay.h>
+
+#include <avr/pgmspace.h>
+#include "usbdrv.h"
+#include "libs-device/osccal.h"
+
+#define RELAY_BIT 8 /* Bit 3 on port B */
+#define CMD_ALL_ON 0xfe
+#define CMD_ALL_OFF 0xfc
+#define CMD_ON 0xff
+#define CMD_OFF 0xfd
+#define CMD_SET_SERIAL 0xfa
+
+uchar serno_read = 0;
+uchar serno[6];
+
+PROGMEM const char usbHidReportDescriptor[22] = {
+       0x06, 0x00, 0xff,               /* USAGE PAGE (Generic Desktop) */
+       0x09, 0x01,                     /* USAGE (Vendor Usage 1) */
+       0xa1, 0x01,                     /* COLLECTION (Application) */
+       0x15, 0x00,                     /*   LOGICAL_MINIMUM (0) */
+       0x26, 0xff, 0x00,               /*   LOGICAL_MAXIMUM (255) */
+       0x75, 0x08,                     /*   REPORT_SIZE (8) */
+       0x95, 0x08,                     /*   REPORT_COUNT (8) */
+       0x09, 0x00,                     /*   USAGE (Undefined) */
+       0xb2, 0x02, 0x01,               /*   FEATURE (Data, Var, Abs, Buf) */
+       0xc0                            /* END_COLLECTION */
+};
+
+void fetch_serno(void)
+{
+       if (!serno_read) {
+               eeprom_read_block(serno, 0, 6);
+               if (serno[0] == 0xff) {
+                       /* If the EEPROM is blank, return a default serial # */
+                       serno[0] = 'U';
+                       serno[1] = 'N';
+                       serno[2] = 'S';
+                       serno[3] = 'E';
+                       serno[4] = 'T';
+                       serno[5] = 0;
+               }
+               serno_read = 1;
+       }
+}
+
+void update_serno(uchar *buf, uchar len)
+{
+       uchar i;
+
+       /*
+        * I have no idea why this gets stored 3 times, but the original
+        * firmware does it.
+        */
+       eeprom_write_block(buf, (void *) 0x00, len);
+       eeprom_write_block(buf, (void *) 0x40, len);
+       eeprom_write_block(buf, (void *) 0x80, len);
+
+       for (i = 0; i < 6; i++) {
+               serno[i] = buf[i];
+       }
+}
+
+usbMsgLen_t usbFunctionSetup(uchar data[8])
+{
+       usbRequest_t *rq = (void *) data;
+
+       if ((rq->bmRequestType & USBRQ_TYPE_MASK) == USBRQ_TYPE_CLASS) {
+               if ((rq->bRequest == USBRQ_HID_GET_REPORT) ||
+                               (rq->bRequest == USBRQ_HID_SET_REPORT)) {
+                       return 0xFF;
+               }
+       }
+
+       return 0;
+}
+
+uchar usbFunctionRead(uchar *data, uchar len)
+{
+       uchar i;
+
+       if (len != 0) {
+               fetch_serno();
+               for (i = 0; i < 6; i++) {
+                       data[i] = serno[i];
+               }
+               data[6] = data[7] = 0;
+               if (PORTB & RELAY_BIT) {
+                       data[7] = 1;
+               }
+               return len;
+       }
+
+       return 0;
+}
+
+uchar usbFunctionWrite(uchar *data, uchar len)
+{
+       if (data[0] == CMD_ALL_ON) {
+               PORTB |= RELAY_BIT;
+       } else if (data[0] == CMD_ALL_OFF) {
+               PORTB &= ~(RELAY_BIT);
+       } else if (data[0] == CMD_ON) {
+               if (data[1] == 1) {
+                       PORTB |= RELAY_BIT;
+               }
+       } else if (data[0] == CMD_OFF) {
+               if (data[1] == 1) {
+                       PORTB &= ~(RELAY_BIT);
+               }
+       } else if (data[0] == CMD_SET_SERIAL) {
+               update_serno(&data[1], 6);
+       }
+
+       return len;
+}
+
+int __attribute__((noreturn)) main(void)
+{
+       unsigned char i;
+
+       wdt_enable(WDTO_1S);
+
+       usbInit();
+       usbDeviceDisconnect();
+
+       i = 0;
+       while (--i) {
+               wdt_reset();
+               _delay_ms(1);
+       }
+
+       usbDeviceConnect();
+
+       /* Set the relay bit to output mode */
+       DDRB |= RELAY_BIT;
+
+       sei(); /* We're ready to go; enable interrupts */
+
+       while (1) {
+               wdt_reset();
+               usbPoll();
+       }
+}