added prescaler for 16 bit pwm in LPC1347 target
Fork of mbed-dev by
targets/hal/TARGET_Silicon_Labs/TARGET_EFM32/analogout_api.c@50:a417edff4437, 2016-01-15 (annotated)
- Committer:
- mbed_official
- Date:
- Fri Jan 15 07:45:16 2016 +0000
- Revision:
- 50:a417edff4437
- Parent:
- 0:9b334a45a8ff
- Child:
- 144:ef7eb2e8f9f7
Synchronized with git revision 6010f32619bfcbb01cc73747d4ff9040863482d9
Full URL: https://github.com/mbedmicro/mbed/commit/6010f32619bfcbb01cc73747d4ff9040863482d9/
Remove doubling of buffer size in realiseEndpoint()
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
bogdanm | 0:9b334a45a8ff | 1 | /***************************************************************************//** |
bogdanm | 0:9b334a45a8ff | 2 | * @file analogout_aoi.c |
bogdanm | 0:9b334a45a8ff | 3 | ******************************************************************************* |
bogdanm | 0:9b334a45a8ff | 4 | * @section License |
bogdanm | 0:9b334a45a8ff | 5 | * <b>(C) Copyright 2015 Silicon Labs, http://www.silabs.com</b> |
bogdanm | 0:9b334a45a8ff | 6 | ******************************************************************************* |
bogdanm | 0:9b334a45a8ff | 7 | * |
bogdanm | 0:9b334a45a8ff | 8 | * Permission is granted to anyone to use this software for any purpose, |
bogdanm | 0:9b334a45a8ff | 9 | * including commercial applications, and to alter it and redistribute it |
bogdanm | 0:9b334a45a8ff | 10 | * freely, subject to the following restrictions: |
bogdanm | 0:9b334a45a8ff | 11 | * |
bogdanm | 0:9b334a45a8ff | 12 | * 1. The origin of this software must not be misrepresented; you must not |
bogdanm | 0:9b334a45a8ff | 13 | * claim that you wrote the original software. |
bogdanm | 0:9b334a45a8ff | 14 | * 2. Altered source versions must be plainly marked as such, and must not be |
bogdanm | 0:9b334a45a8ff | 15 | * misrepresented as being the original software. |
bogdanm | 0:9b334a45a8ff | 16 | * 3. This notice may not be removed or altered from any source distribution. |
bogdanm | 0:9b334a45a8ff | 17 | * |
bogdanm | 0:9b334a45a8ff | 18 | * DISCLAIMER OF WARRANTY/LIMITATION OF REMEDIES: Silicon Labs has no |
bogdanm | 0:9b334a45a8ff | 19 | * obligation to support this Software. Silicon Labs is providing the |
bogdanm | 0:9b334a45a8ff | 20 | * Software "AS IS", with no express or implied warranties of any kind, |
bogdanm | 0:9b334a45a8ff | 21 | * including, but not limited to, any implied warranties of merchantability |
bogdanm | 0:9b334a45a8ff | 22 | * or fitness for any particular purpose or warranties against infringement |
bogdanm | 0:9b334a45a8ff | 23 | * of any proprietary rights of a third party. |
bogdanm | 0:9b334a45a8ff | 24 | * |
bogdanm | 0:9b334a45a8ff | 25 | * Silicon Labs will not be liable for any consequential, incidental, or |
bogdanm | 0:9b334a45a8ff | 26 | * special damages, or any other relief, or for any claim by any third party, |
bogdanm | 0:9b334a45a8ff | 27 | * arising from your use of this Software. |
bogdanm | 0:9b334a45a8ff | 28 | * |
bogdanm | 0:9b334a45a8ff | 29 | ******************************************************************************/ |
bogdanm | 0:9b334a45a8ff | 30 | |
bogdanm | 0:9b334a45a8ff | 31 | #include "device.h" |
bogdanm | 0:9b334a45a8ff | 32 | #if DEVICE_ANALOGOUT |
bogdanm | 0:9b334a45a8ff | 33 | |
bogdanm | 0:9b334a45a8ff | 34 | #include "mbed_assert.h" |
bogdanm | 0:9b334a45a8ff | 35 | #include "error.h" |
bogdanm | 0:9b334a45a8ff | 36 | #include "analogout_api.h" |
bogdanm | 0:9b334a45a8ff | 37 | #include "pinmap.h" |
bogdanm | 0:9b334a45a8ff | 38 | #include "pinmap_function.h" |
bogdanm | 0:9b334a45a8ff | 39 | #include "PeripheralPins.h" |
bogdanm | 0:9b334a45a8ff | 40 | #include "clocking.h" |
bogdanm | 0:9b334a45a8ff | 41 | |
bogdanm | 0:9b334a45a8ff | 42 | #include "em_dac.h" |
bogdanm | 0:9b334a45a8ff | 43 | #include "em_cmu.h" |
bogdanm | 0:9b334a45a8ff | 44 | |
mbed_official | 50:a417edff4437 | 45 | static uint8_t dac_initialized = 0; |
mbed_official | 50:a417edff4437 | 46 | |
mbed_official | 50:a417edff4437 | 47 | void analogout_init(dac_t *obj, PinName pin) |
bogdanm | 0:9b334a45a8ff | 48 | { |
mbed_official | 50:a417edff4437 | 49 | /* init in-memory structure */ |
bogdanm | 0:9b334a45a8ff | 50 | obj->dac = (DAC_TypeDef *) pinmap_peripheral(pin, PinMap_DAC); |
bogdanm | 0:9b334a45a8ff | 51 | MBED_ASSERT((int) obj->dac != NC); |
bogdanm | 0:9b334a45a8ff | 52 | |
bogdanm | 0:9b334a45a8ff | 53 | obj->channel = pin_location(pin, PinMap_DAC); |
bogdanm | 0:9b334a45a8ff | 54 | MBED_ASSERT((int) obj->channel != NC); |
mbed_official | 50:a417edff4437 | 55 | |
mbed_official | 50:a417edff4437 | 56 | pin_mode(pin, Disabled); |
bogdanm | 0:9b334a45a8ff | 57 | |
bogdanm | 0:9b334a45a8ff | 58 | if (!dac_initialized) { |
bogdanm | 0:9b334a45a8ff | 59 | /* Initialize the DAC. Will disable both DAC channels, so should only be done once */ |
bogdanm | 0:9b334a45a8ff | 60 | /* Use default settings */ |
bogdanm | 0:9b334a45a8ff | 61 | CMU_ClockEnable(cmuClock_DAC0, true); |
bogdanm | 0:9b334a45a8ff | 62 | |
bogdanm | 0:9b334a45a8ff | 63 | DAC_Init_TypeDef init = DAC_INIT_DEFAULT; |
bogdanm | 0:9b334a45a8ff | 64 | |
bogdanm | 0:9b334a45a8ff | 65 | /* Calculate the DAC clock prescaler value that will result in a DAC clock |
bogdanm | 0:9b334a45a8ff | 66 | * close to 500kHz. Second parameter is zero. This uses the current HFPERCLK |
bogdanm | 0:9b334a45a8ff | 67 | * frequency instead of setting a new one. */ |
bogdanm | 0:9b334a45a8ff | 68 | init.prescale = DAC_PrescaleCalc(500000, REFERENCE_FREQUENCY); |
bogdanm | 0:9b334a45a8ff | 69 | |
bogdanm | 0:9b334a45a8ff | 70 | /* Set reference voltage to VDD */ |
bogdanm | 0:9b334a45a8ff | 71 | init.reference = dacRefVDD; |
bogdanm | 0:9b334a45a8ff | 72 | |
bogdanm | 0:9b334a45a8ff | 73 | DAC_Init(obj->dac, &init); |
bogdanm | 0:9b334a45a8ff | 74 | dac_initialized = 1; |
bogdanm | 0:9b334a45a8ff | 75 | } |
bogdanm | 0:9b334a45a8ff | 76 | /* Use default channel settings */ |
bogdanm | 0:9b334a45a8ff | 77 | DAC_InitChannel_TypeDef initChannel = DAC_INITCHANNEL_DEFAULT; |
mbed_official | 50:a417edff4437 | 78 | initChannel.enable = true; |
bogdanm | 0:9b334a45a8ff | 79 | DAC_InitChannel(obj->dac, &initChannel, obj->channel); |
bogdanm | 0:9b334a45a8ff | 80 | } |
bogdanm | 0:9b334a45a8ff | 81 | |
mbed_official | 50:a417edff4437 | 82 | void analogout_free(dac_t *obj) |
bogdanm | 0:9b334a45a8ff | 83 | { |
mbed_official | 50:a417edff4437 | 84 | //Reset channel by re-initializing |
mbed_official | 50:a417edff4437 | 85 | DAC_InitChannel_TypeDef initChannel = DAC_INITCHANNEL_DEFAULT; |
mbed_official | 50:a417edff4437 | 86 | initChannel.enable = false; |
mbed_official | 50:a417edff4437 | 87 | DAC_InitChannel(obj->dac, &initChannel, obj->channel); |
mbed_official | 50:a417edff4437 | 88 | |
mbed_official | 50:a417edff4437 | 89 | //Check all channels to see if we can disable the DAC completely |
mbed_official | 50:a417edff4437 | 90 | if((DAC0->CH0CTRL & DAC_CH0CTRL_EN) == 0 && (DAC0->CH1CTRL & DAC_CH1CTRL_EN) == 0) { |
mbed_official | 50:a417edff4437 | 91 | CMU_ClockEnable(cmuClock_DAC0, false); |
mbed_official | 50:a417edff4437 | 92 | dac_initialized = 0; |
mbed_official | 50:a417edff4437 | 93 | } |
bogdanm | 0:9b334a45a8ff | 94 | } |
bogdanm | 0:9b334a45a8ff | 95 | |
bogdanm | 0:9b334a45a8ff | 96 | static inline void dac_write(dac_t *obj, int value) |
bogdanm | 0:9b334a45a8ff | 97 | { |
bogdanm | 0:9b334a45a8ff | 98 | switch (obj->channel) { |
bogdanm | 0:9b334a45a8ff | 99 | case 0: |
bogdanm | 0:9b334a45a8ff | 100 | obj->dac->CH0DATA = value; |
bogdanm | 0:9b334a45a8ff | 101 | break; |
bogdanm | 0:9b334a45a8ff | 102 | case 1: |
bogdanm | 0:9b334a45a8ff | 103 | obj->dac->CH1DATA = value; |
bogdanm | 0:9b334a45a8ff | 104 | break; |
bogdanm | 0:9b334a45a8ff | 105 | } |
bogdanm | 0:9b334a45a8ff | 106 | } |
bogdanm | 0:9b334a45a8ff | 107 | |
bogdanm | 0:9b334a45a8ff | 108 | static inline int dac_read(dac_t *obj) |
bogdanm | 0:9b334a45a8ff | 109 | { |
bogdanm | 0:9b334a45a8ff | 110 | switch (obj->channel) { |
bogdanm | 0:9b334a45a8ff | 111 | case 0: |
bogdanm | 0:9b334a45a8ff | 112 | return obj->dac->CH0DATA; |
bogdanm | 0:9b334a45a8ff | 113 | break; |
bogdanm | 0:9b334a45a8ff | 114 | case 1: |
bogdanm | 0:9b334a45a8ff | 115 | return obj->dac->CH1DATA; |
bogdanm | 0:9b334a45a8ff | 116 | break; |
bogdanm | 0:9b334a45a8ff | 117 | default: |
bogdanm | 0:9b334a45a8ff | 118 | error("AnalogOut pin error. Invalid channel"); |
bogdanm | 0:9b334a45a8ff | 119 | return -1; |
bogdanm | 0:9b334a45a8ff | 120 | break; |
bogdanm | 0:9b334a45a8ff | 121 | } |
bogdanm | 0:9b334a45a8ff | 122 | } |
bogdanm | 0:9b334a45a8ff | 123 | |
bogdanm | 0:9b334a45a8ff | 124 | void analogout_write(dac_t *obj, float value) |
bogdanm | 0:9b334a45a8ff | 125 | { |
bogdanm | 0:9b334a45a8ff | 126 | /* We multiply the float value with 0xFFF because the DAC has 12-bit resolution. |
bogdanm | 0:9b334a45a8ff | 127 | * Ie. accepts values between 0 and 0xFFF (4096). */ |
bogdanm | 0:9b334a45a8ff | 128 | dac_write(obj, value*0xFFF); |
bogdanm | 0:9b334a45a8ff | 129 | } |
bogdanm | 0:9b334a45a8ff | 130 | |
bogdanm | 0:9b334a45a8ff | 131 | void analogout_write_u16(dac_t *obj, uint16_t value) |
bogdanm | 0:9b334a45a8ff | 132 | { |
bogdanm | 0:9b334a45a8ff | 133 | /* The DAC has 12 bit resolution, so we remove the 4 least significant bits */ |
bogdanm | 0:9b334a45a8ff | 134 | dac_write(obj, value >> 4); |
bogdanm | 0:9b334a45a8ff | 135 | } |
bogdanm | 0:9b334a45a8ff | 136 | |
bogdanm | 0:9b334a45a8ff | 137 | float analogout_read(dac_t *obj) |
bogdanm | 0:9b334a45a8ff | 138 | { |
bogdanm | 0:9b334a45a8ff | 139 | /* dac_read returns a number between 0 and 0xFFF. Division gives us a float between 0 and 1 */ |
bogdanm | 0:9b334a45a8ff | 140 | return dac_read(obj)/(float)0xFFF; |
bogdanm | 0:9b334a45a8ff | 141 | } |
bogdanm | 0:9b334a45a8ff | 142 | |
bogdanm | 0:9b334a45a8ff | 143 | uint16_t analogout_read_u16(dac_t *obj) |
bogdanm | 0:9b334a45a8ff | 144 | { |
bogdanm | 0:9b334a45a8ff | 145 | /* dac_read returns a number with 12 significant digits, |
bogdanm | 0:9b334a45a8ff | 146 | * so we shift in 0s from right to make it a 16 bit number */ |
bogdanm | 0:9b334a45a8ff | 147 | return dac_read(obj) << 4; |
bogdanm | 0:9b334a45a8ff | 148 | } |
bogdanm | 0:9b334a45a8ff | 149 | |
bogdanm | 0:9b334a45a8ff | 150 | #endif |