Diff: MultiChannelRelay.cpp

Revision:

0:661beaa91d83

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/MultiChannelRelay.cpp	Tue Sep 08 16:20:02 2020 +0000
@@ -0,0 +1,126 @@
+/*
+    MultiChannelRelay.h
+    Seeed multi channel relay library
+
+    Copyright (c) 2018 Seeed Technology Co., Ltd.
+    Author        :   lambor
+    Create Time   :   June 2018
+    Change Log    :
+
+    This library is free software; you can redistribute it and/or
+    modify it under the terms of the GNU Lesser General Public
+    License as published by the Free Software Foundation; either
+    version 2.1 of the License, or (at your option) any later version.
+
+    This library 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
+    Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public
+    License along with this library; if not, write to the Free Software
+    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+#include "MultiChannelRelay.h"
+
+MultiChannelRelay::MultiChannelRelay(I2C *i2c, uint8_t slave_adr)
+    : _i2c(i2c)
+    //, _i2cAddr(slave_adr)
+{
+    channel_state = 0;
+    _i2cAddr = slave_adr << 1;
+}
+
+
+uint8_t MultiChannelRelay::getFirmwareVersion(void)
+{
+    char cmd[2];
+    cmd[0] = CMD_READ_FIRMWARE_VER;
+    
+    sendToDevice( cmd, 1, 1, 10 );
+
+    return cmd[0];
+}
+
+void MultiChannelRelay::changeI2CAddress(uint8_t old_addr, uint8_t new_addr)
+{
+    char cmd[2];
+    cmd[0] = CMD_SAVE_I2C_ADDR;
+    cmd[1] = new_addr;
+    
+    sendToDevice( cmd, 2, 0, 10 );
+    _i2cAddr = new_addr;
+}
+
+uint8_t MultiChannelRelay::getChannelState(void)
+{
+    return channel_state;
+}
+
+void MultiChannelRelay::channelCtrl(uint8_t state)
+{
+    channel_state = state;
+    char cmd[2];
+    cmd[0] = CMD_CHANNEL_CTRL;
+    cmd[1] = channel_state;
+    
+    sendToDevice( cmd, 2, 0, 10 );
+}
+
+void MultiChannelRelay::turn_on_channel(uint8_t channel)
+{
+    channel_state |= (1 << (channel - 1));
+    char cmd[2];
+    cmd[0] = CMD_CHANNEL_CTRL;
+    cmd[1] = channel_state;
+    
+    sendToDevice( cmd, 2, 0, 10 );
+}
+
+void MultiChannelRelay::turn_off_channel(uint8_t channel)
+{
+    channel_state &= ~(1 << (channel - 1));
+    char cmd[2];
+    cmd[0] = CMD_CHANNEL_CTRL;
+    cmd[1] = channel_state;
+    
+    sendToDevice( cmd, 2, 0, 10 );
+}
+
+
+/** Send a request to the chip, perform a wait and get response
+ * @param cmd Pointer to character array containing request, no line endings needed
+ * @param reqSize Size of the request in characters
+ * @param respSize Size of the response in bytes, must be at least 1 character
+ * @param msWait Delay between sending request and reading response in mS
+ * @return true/false to indicate command was processed sucessfully or not, true success, false failure
+ */
+bool MultiChannelRelay::sendToDevice( char *cmd, int reqSize, int respSize, long msWait )
+{
+    bool retstat = false;
+    int result = -10;
+    _i2c->frequency(100000);
+    _i2c->lock();
+    result = _i2c->write(_i2cAddr, cmd, reqSize);
+    if ( result ) {
+        _i2c->unlock();
+        return retstat;
+    }
+
+    wait_us( msWait * 100  );
+    if( respSize == 0 ) {
+        _i2c->unlock();
+        return true;
+    }
+
+    result = _i2c->read(_i2cAddr, cmd, respSize);
+    _i2c->unlock();
+    if ( result ) {
+    } else
+        retstat = true;
+
+    return retstat;
+}
+
+