mbed library sources
Dependents: frdm_kl05z_gpio_test
Fork of mbed-src by
vendor/NXP/LPC1768/hal/analogout_api.c@10:3bc89ef62ce7, 2013-06-14 (annotated)
- Committer:
- emilmont
- Date:
- Fri Jun 14 17:49:17 2013 +0100
- Revision:
- 10:3bc89ef62ce7
Unify mbed library sources
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
emilmont | 10:3bc89ef62ce7 | 1 | /* mbed Microcontroller Library |
emilmont | 10:3bc89ef62ce7 | 2 | * Copyright (c) 2006-2013 ARM Limited |
emilmont | 10:3bc89ef62ce7 | 3 | * |
emilmont | 10:3bc89ef62ce7 | 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
emilmont | 10:3bc89ef62ce7 | 5 | * you may not use this file except in compliance with the License. |
emilmont | 10:3bc89ef62ce7 | 6 | * You may obtain a copy of the License at |
emilmont | 10:3bc89ef62ce7 | 7 | * |
emilmont | 10:3bc89ef62ce7 | 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
emilmont | 10:3bc89ef62ce7 | 9 | * |
emilmont | 10:3bc89ef62ce7 | 10 | * Unless required by applicable law or agreed to in writing, software |
emilmont | 10:3bc89ef62ce7 | 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
emilmont | 10:3bc89ef62ce7 | 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
emilmont | 10:3bc89ef62ce7 | 13 | * See the License for the specific language governing permissions and |
emilmont | 10:3bc89ef62ce7 | 14 | * limitations under the License. |
emilmont | 10:3bc89ef62ce7 | 15 | */ |
emilmont | 10:3bc89ef62ce7 | 16 | #include "analogout_api.h" |
emilmont | 10:3bc89ef62ce7 | 17 | |
emilmont | 10:3bc89ef62ce7 | 18 | #include "cmsis.h" |
emilmont | 10:3bc89ef62ce7 | 19 | #include "pinmap.h" |
emilmont | 10:3bc89ef62ce7 | 20 | #include "error.h" |
emilmont | 10:3bc89ef62ce7 | 21 | |
emilmont | 10:3bc89ef62ce7 | 22 | static const PinMap PinMap_DAC[] = { |
emilmont | 10:3bc89ef62ce7 | 23 | {P0_26, DAC_0, 2}, |
emilmont | 10:3bc89ef62ce7 | 24 | {NC , NC , 0} |
emilmont | 10:3bc89ef62ce7 | 25 | }; |
emilmont | 10:3bc89ef62ce7 | 26 | |
emilmont | 10:3bc89ef62ce7 | 27 | void analogout_init(dac_t *obj, PinName pin) { |
emilmont | 10:3bc89ef62ce7 | 28 | obj->dac = (DACName)pinmap_peripheral(pin, PinMap_DAC); |
emilmont | 10:3bc89ef62ce7 | 29 | if (obj->dac == (uint32_t)NC) { |
emilmont | 10:3bc89ef62ce7 | 30 | error("DAC pin mapping failed"); |
emilmont | 10:3bc89ef62ce7 | 31 | } |
emilmont | 10:3bc89ef62ce7 | 32 | |
emilmont | 10:3bc89ef62ce7 | 33 | // power is on by default, set DAC clk divider is /4 |
emilmont | 10:3bc89ef62ce7 | 34 | LPC_SC->PCLKSEL0 &= ~(0x3 << 22); |
emilmont | 10:3bc89ef62ce7 | 35 | |
emilmont | 10:3bc89ef62ce7 | 36 | // map out (must be done before accessing registers) |
emilmont | 10:3bc89ef62ce7 | 37 | pinmap_pinout(pin, PinMap_DAC); |
emilmont | 10:3bc89ef62ce7 | 38 | |
emilmont | 10:3bc89ef62ce7 | 39 | analogout_write_u16(obj, 0); |
emilmont | 10:3bc89ef62ce7 | 40 | } |
emilmont | 10:3bc89ef62ce7 | 41 | |
emilmont | 10:3bc89ef62ce7 | 42 | void analogout_free(dac_t *obj) {} |
emilmont | 10:3bc89ef62ce7 | 43 | |
emilmont | 10:3bc89ef62ce7 | 44 | static inline void dac_write(int value) { |
emilmont | 10:3bc89ef62ce7 | 45 | value &= 0x3FF; // 10-bit |
emilmont | 10:3bc89ef62ce7 | 46 | |
emilmont | 10:3bc89ef62ce7 | 47 | // Set the DAC output |
emilmont | 10:3bc89ef62ce7 | 48 | LPC_DAC->DACR = (0 << 16) // bias = 0 |
emilmont | 10:3bc89ef62ce7 | 49 | | (value << 6); |
emilmont | 10:3bc89ef62ce7 | 50 | } |
emilmont | 10:3bc89ef62ce7 | 51 | |
emilmont | 10:3bc89ef62ce7 | 52 | static inline int dac_read() { |
emilmont | 10:3bc89ef62ce7 | 53 | return (LPC_DAC->DACR >> 6) & 0x3FF; |
emilmont | 10:3bc89ef62ce7 | 54 | } |
emilmont | 10:3bc89ef62ce7 | 55 | |
emilmont | 10:3bc89ef62ce7 | 56 | void analogout_write(dac_t *obj, float value) { |
emilmont | 10:3bc89ef62ce7 | 57 | if (value < 0.0f) { |
emilmont | 10:3bc89ef62ce7 | 58 | dac_write(0); |
emilmont | 10:3bc89ef62ce7 | 59 | } else if (value > 1.0f) { |
emilmont | 10:3bc89ef62ce7 | 60 | dac_write(0x3FF); |
emilmont | 10:3bc89ef62ce7 | 61 | } else { |
emilmont | 10:3bc89ef62ce7 | 62 | dac_write(value * (float)0x3FF); |
emilmont | 10:3bc89ef62ce7 | 63 | } |
emilmont | 10:3bc89ef62ce7 | 64 | } |
emilmont | 10:3bc89ef62ce7 | 65 | |
emilmont | 10:3bc89ef62ce7 | 66 | void analogout_write_u16(dac_t *obj, uint16_t value) { |
emilmont | 10:3bc89ef62ce7 | 67 | dac_write(value >> 6); // 10-bit |
emilmont | 10:3bc89ef62ce7 | 68 | } |
emilmont | 10:3bc89ef62ce7 | 69 | |
emilmont | 10:3bc89ef62ce7 | 70 | float analogout_read(dac_t *obj) { |
emilmont | 10:3bc89ef62ce7 | 71 | uint32_t value = dac_read(); |
emilmont | 10:3bc89ef62ce7 | 72 | return (float)value * (1.0f / (float)0x3FF); |
emilmont | 10:3bc89ef62ce7 | 73 | } |
emilmont | 10:3bc89ef62ce7 | 74 | |
emilmont | 10:3bc89ef62ce7 | 75 | uint16_t analogout_read_u16(dac_t *obj) { |
emilmont | 10:3bc89ef62ce7 | 76 | uint32_t value = dac_read(); // 10-bit |
emilmont | 10:3bc89ef62ce7 | 77 | return (value << 6) | ((value >> 4) & 0x003F); |
emilmont | 10:3bc89ef62ce7 | 78 | } |