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AnalogOut.h@27:7110ebee3484, 2011-11-29 (annotated)

Committer:
emilmont
Date:
Tue Nov 29 14:59:27 2011 +0000
Revision:
27:7110ebee3484
Parent:
11:1c1ebd0324fa
Child:
43:e2ed12d17f06
New Libraries 11.11

Who changed what in which revision?

UserRevisionLine numberNew contents of line
simon.ford@mbed.co.uk 0:82220227f4fa 1 /* mbed Microcontroller Library - AnalogOut
emilmont 27:7110ebee3484 2 * Copyright (c) 2006-2011 ARM Limited. All rights reserved.
simon.ford@mbed.co.uk 5:62573be585e9 3 */
simon.ford@mbed.co.uk 0:82220227f4fa 4
simon.ford@mbed.co.uk 0:82220227f4fa 5 #ifndef MBED_ANALOGOUT_H
simon.ford@mbed.co.uk 0:82220227f4fa 6 #define MBED_ANALOGOUT_H
simon.ford@mbed.co.uk 0:82220227f4fa 7
emilmont 27:7110ebee3484 8 #include "device.h"
emilmont 27:7110ebee3484 9
emilmont 27:7110ebee3484 10 #if DEVICE_ANALOGOUT
emilmont 27:7110ebee3484 11
rolf.meyer@arm.com 11:1c1ebd0324fa 12 #include "platform.h"
rolf.meyer@arm.com 11:1c1ebd0324fa 13 #include "PinNames.h"
rolf.meyer@arm.com 11:1c1ebd0324fa 14 #include "PeripheralNames.h"
simon.ford@mbed.co.uk 0:82220227f4fa 15 #include "Base.h"
simon.ford@mbed.co.uk 0:82220227f4fa 16
simon.ford@mbed.co.uk 0:82220227f4fa 17 namespace mbed {
simon.ford@mbed.co.uk 0:82220227f4fa 18
simon.ford@mbed.co.uk 0:82220227f4fa 19 /* Class: AnalogOut
simon.ford@mbed.co.uk 0:82220227f4fa 20 * An analog output, used for setting the voltage on a pin
rolf.meyer@arm.com 11:1c1ebd0324fa 21 *
rolf.meyer@arm.com 11:1c1ebd0324fa 22 * Example:
rolf.meyer@arm.com 11:1c1ebd0324fa 23 * > // Make a sawtooth output
rolf.meyer@arm.com 11:1c1ebd0324fa 24 * >
rolf.meyer@arm.com 11:1c1ebd0324fa 25 * > #include "mbed.h"
rolf.meyer@arm.com 11:1c1ebd0324fa 26 * >
rolf.meyer@arm.com 11:1c1ebd0324fa 27 * > AnalogOut tri(p18);
rolf.meyer@arm.com 11:1c1ebd0324fa 28 * > int main() {
rolf.meyer@arm.com 11:1c1ebd0324fa 29 * > while(1) {
rolf.meyer@arm.com 11:1c1ebd0324fa 30 * > tri = tri + 0.01;
rolf.meyer@arm.com 11:1c1ebd0324fa 31 * > wait_us(1);
rolf.meyer@arm.com 11:1c1ebd0324fa 32 * > if(tri == 1) {
rolf.meyer@arm.com 11:1c1ebd0324fa 33 * > tri = 0;
rolf.meyer@arm.com 11:1c1ebd0324fa 34 * > }
rolf.meyer@arm.com 11:1c1ebd0324fa 35 * > }
rolf.meyer@arm.com 11:1c1ebd0324fa 36 * > }
simon.ford@mbed.co.uk 0:82220227f4fa 37 */
simon.ford@mbed.co.uk 0:82220227f4fa 38 class AnalogOut : public Base {
simon.ford@mbed.co.uk 0:82220227f4fa 39
simon.ford@mbed.co.uk 0:82220227f4fa 40 public:
simon.ford@mbed.co.uk 0:82220227f4fa 41
simon.ford@mbed.co.uk 0:82220227f4fa 42 /* Constructor: AnalogOut
simon.ford@mbed.co.uk 0:82220227f4fa 43 * Create an AnalogOut connected to the specified pin
simon.ford@mbed.co.uk 0:82220227f4fa 44 *
simon.ford@mbed.co.uk 0:82220227f4fa 45 * Variables:
simon.ford@mbed.co.uk 0:82220227f4fa 46 * pin - AnalogOut pin to connect to (18)
simon.ford@mbed.co.uk 0:82220227f4fa 47 */
rolf.meyer@arm.com 11:1c1ebd0324fa 48 AnalogOut(PinName pin, const char *name = NULL);
simon.ford@mbed.co.uk 0:82220227f4fa 49
rolf.meyer@arm.com 11:1c1ebd0324fa 50 /* Function: write
rolf.meyer@arm.com 11:1c1ebd0324fa 51 * Set the output voltage, specified as a percentage (float)
rolf.meyer@arm.com 11:1c1ebd0324fa 52 *
rolf.meyer@arm.com 11:1c1ebd0324fa 53 * Variables:
rolf.meyer@arm.com 11:1c1ebd0324fa 54 * percent - A floating-point value representing the output voltage,
rolf.meyer@arm.com 11:1c1ebd0324fa 55 * specified as a percentage. The value should lie between
rolf.meyer@arm.com 11:1c1ebd0324fa 56 * 0.0f (representing 0v / 0%) and 1.0f (representing 3.3v / 100%).
rolf.meyer@arm.com 11:1c1ebd0324fa 57 * Values outside this range will be saturated to 0.0f or 1.0f.
rolf.meyer@arm.com 11:1c1ebd0324fa 58 */
rolf.meyer@arm.com 11:1c1ebd0324fa 59 void write(float value);
simon.ford@mbed.co.uk 0:82220227f4fa 60
simon.ford@mbed.co.uk 5:62573be585e9 61 /* Function: write_u16
simon.ford@mbed.co.uk 5:62573be585e9 62 * Set the output voltage, represented as an unsigned short in the range [0x0, 0xFFFF]
simon.ford@mbed.co.uk 5:62573be585e9 63 *
simon.ford@mbed.co.uk 5:62573be585e9 64 * Variables:
simon.ford@mbed.co.uk 5:62573be585e9 65 * value - 16-bit unsigned short representing the output voltage,
simon.ford@mbed.co.uk 5:62573be585e9 66 * normalised to a 16-bit value (0x0000 = 0v, 0xFFFF = 3.3v)
simon.ford@mbed.co.uk 5:62573be585e9 67 */
simon.ford@mbed.co.uk 5:62573be585e9 68 void write_u16(unsigned short value);
simon.ford@mbed.co.uk 5:62573be585e9 69
simon.ford@mbed.co.uk 0:82220227f4fa 70 /* Function: read
rolf.meyer@arm.com 11:1c1ebd0324fa 71 * Return the current output voltage setting, measured as a percentage (float)
simon.ford@mbed.co.uk 0:82220227f4fa 72 *
simon.ford@mbed.co.uk 0:82220227f4fa 73 * Variables:
rolf.meyer@arm.com 11:1c1ebd0324fa 74 * returns - A floating-point value representing the current voltage being output on the pin,
rolf.meyer@arm.com 11:1c1ebd0324fa 75 * measured as a percentage. The returned value will lie between
rolf.meyer@arm.com 11:1c1ebd0324fa 76 * 0.0f (representing 0v / 0%) and 1.0f (representing 3.3v / 100%).
rolf.meyer@arm.com 11:1c1ebd0324fa 77 *
rolf.meyer@arm.com 11:1c1ebd0324fa 78 * Note:
rolf.meyer@arm.com 11:1c1ebd0324fa 79 * This value may not match exactly the value set by a previous <write>.
rolf.meyer@arm.com 11:1c1ebd0324fa 80 */
simon.ford@mbed.co.uk 0:82220227f4fa 81 float read();
simon.ford@mbed.co.uk 0:82220227f4fa 82
rolf.meyer@arm.com 11:1c1ebd0324fa 83
rolf.meyer@arm.com 11:1c1ebd0324fa 84 #ifdef MBED_OPERATORS
simon.ford@mbed.co.uk 0:82220227f4fa 85 /* Function: operator=
simon.ford@mbed.co.uk 5:62573be585e9 86 * An operator shorthand for <write()>
simon.ford@mbed.co.uk 0:82220227f4fa 87 */
simon.ford@mbed.co.uk 0:82220227f4fa 88 AnalogOut& operator= (float percent);
simon.ford@mbed.co.uk 0:82220227f4fa 89 AnalogOut& operator= (AnalogOut& rhs);
simon.ford@mbed.co.uk 0:82220227f4fa 90
simon.ford@mbed.co.uk 0:82220227f4fa 91 /* Function: operator float()
rolf.meyer@arm.com 11:1c1ebd0324fa 92 * An operator shorthand for <read()>
rolf.meyer@arm.com 11:1c1ebd0324fa 93 */
simon.ford@mbed.co.uk 0:82220227f4fa 94 operator float();
rolf.meyer@arm.com 11:1c1ebd0324fa 95 #endif
simon.ford@mbed.co.uk 4:5d1359a283bc 96
rolf.meyer@arm.com 11:1c1ebd0324fa 97 #ifdef MBED_RPC
simon.ford@mbed.co.uk 5:62573be585e9 98 virtual const struct rpc_method *get_rpc_methods();
simon.ford@mbed.co.uk 5:62573be585e9 99 static struct rpc_class *get_rpc_class();
rolf.meyer@arm.com 11:1c1ebd0324fa 100 #endif
rolf.meyer@arm.com 11:1c1ebd0324fa 101
rolf.meyer@arm.com 11:1c1ebd0324fa 102 protected:
rolf.meyer@arm.com 11:1c1ebd0324fa 103
rolf.meyer@arm.com 11:1c1ebd0324fa 104 DACName _dac;
simon.ford@mbed.co.uk 5:62573be585e9 105
simon.ford@mbed.co.uk 0:82220227f4fa 106 };
simon.ford@mbed.co.uk 0:82220227f4fa 107
rolf.meyer@arm.com 11:1c1ebd0324fa 108 } // namespace mbed
simon.ford@mbed.co.uk 0:82220227f4fa 109
simon.ford@mbed.co.uk 1:6b7f447ca868 110 #endif
simon.ford@mbed.co.uk 1:6b7f447ca868 111
emilmont 27:7110ebee3484 112 #endif