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Squashed 'tmk_core/' changes from 7967731..b9e0ea0

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b9e0ea0 Merge commit '7fa9d8bdea3773d1195b04d98fcf27cf48ddd81d' as 'tool/mbed/mbed-sdk'
7fa9d8b Squashed 'tool/mbed/mbed-sdk/' content from commit 7c21ce5

git-subtree-dir: tmk_core
git-subtree-split: b9e0ea08cb940de20b3610ecdda18e9d8cd7c552
This commit is contained in:
Jun Wako 2015-04-24 16:26:14 +09:00
parent a20ef7052c
commit 1fe4406f37
4198 changed files with 2016457 additions and 0 deletions
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67
tool/mbed/mbed-sdk/libraries/tests/peripherals/SRF08/SRF08.cpp Normal file
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/*
Copyright (c) 2010 Chris Styles ( chris dot styles at mbed dot org )
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
*/
#include "SRF08.h"
SRF08::SRF08(PinName sda, PinName scl, int addr) : m_i2c(sda, scl), m_addr(addr) {
char cmd[2];
// Set up SRF08 max range and receiver sensitivity over I2C bus
cmd[0] = 0x02; // Range register
cmd[1] = 0x1C; // Set max range about 100cm
m_i2c.write(m_addr, cmd, 2);
cmd[0] = 0x01; // Receiver gain register
cmd[1] = 0x1B; // Set max receiver gain
m_i2c.write(m_addr, cmd, 2);
}
SRF08::~SRF08() {
}
float SRF08::read() {
char cmd[2];
char echo[2];
// Get range data from SRF08
// Send Tx burst command over I2C bus
cmd[0] = 0x00; // Command register
cmd[1] = 0x51; // Ranging results in cm
m_i2c.write(m_addr, cmd, 2); // Send ranging burst
wait(0.07); // Wait for return echo
// Read back range over I2C bus
cmd[0] = 0x02; // Address of first echo
m_i2c.write(m_addr, cmd, 1, 1); // Send address of first echo
m_i2c.read(m_addr, echo, 2); // Read two-byte echo result
// Generate PWM mark/space ratio from range data
float range = (echo[0]<<8)+echo[1];
return range;
}