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targets/TARGET_NXP/TARGET_LPC15XX/analogout_api.c@178:c26431f84b0d, 2017-11-09 (annotated)
- Committer:
- amithy
- Date:
- Thu Nov 09 22:14:37 2017 +0000
- Revision:
- 178:c26431f84b0d
- Parent:
- 149:156823d33999
test export
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
<> | 144:ef7eb2e8f9f7 | 1 | /* mbed Microcontroller Library |
<> | 144:ef7eb2e8f9f7 | 2 | * Copyright (c) 2006-2013 ARM Limited |
<> | 144:ef7eb2e8f9f7 | 3 | * |
<> | 144:ef7eb2e8f9f7 | 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
<> | 144:ef7eb2e8f9f7 | 5 | * you may not use this file except in compliance with the License. |
<> | 144:ef7eb2e8f9f7 | 6 | * You may obtain a copy of the License at |
<> | 144:ef7eb2e8f9f7 | 7 | * |
<> | 144:ef7eb2e8f9f7 | 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
<> | 144:ef7eb2e8f9f7 | 9 | * |
<> | 144:ef7eb2e8f9f7 | 10 | * Unless required by applicable law or agreed to in writing, software |
<> | 144:ef7eb2e8f9f7 | 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
<> | 144:ef7eb2e8f9f7 | 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
<> | 144:ef7eb2e8f9f7 | 13 | * See the License for the specific language governing permissions and |
<> | 144:ef7eb2e8f9f7 | 14 | * limitations under the License. |
<> | 144:ef7eb2e8f9f7 | 15 | */ |
<> | 144:ef7eb2e8f9f7 | 16 | #include "mbed_assert.h" |
<> | 144:ef7eb2e8f9f7 | 17 | #include "analogout_api.h" |
<> | 144:ef7eb2e8f9f7 | 18 | #include "cmsis.h" |
<> | 144:ef7eb2e8f9f7 | 19 | #include "pinmap.h" |
<> | 144:ef7eb2e8f9f7 | 20 | |
<> | 144:ef7eb2e8f9f7 | 21 | void analogout_init(dac_t *obj, PinName pin) { |
<> | 144:ef7eb2e8f9f7 | 22 | MBED_ASSERT(pin == P0_12); |
<> | 144:ef7eb2e8f9f7 | 23 | |
<> | 144:ef7eb2e8f9f7 | 24 | LPC_SYSCON->SYSAHBCLKCTRL0 |= (1 << 29); |
<> | 144:ef7eb2e8f9f7 | 25 | LPC_SYSCON->PDRUNCFG &= ~(1 << 12); |
<> | 144:ef7eb2e8f9f7 | 26 | LPC_IOCON->PIO0_12 = 0; |
<> | 144:ef7eb2e8f9f7 | 27 | LPC_SWM->PINENABLE0 &= ~(1 << 24); |
<> | 144:ef7eb2e8f9f7 | 28 | LPC_DAC->CTRL = 0; |
<> | 144:ef7eb2e8f9f7 | 29 | |
<> | 144:ef7eb2e8f9f7 | 30 | analogout_write_u16(obj, 0); |
<> | 144:ef7eb2e8f9f7 | 31 | } |
<> | 144:ef7eb2e8f9f7 | 32 | |
<> | 144:ef7eb2e8f9f7 | 33 | void analogout_free(dac_t *obj) |
<> | 144:ef7eb2e8f9f7 | 34 | { |
<> | 144:ef7eb2e8f9f7 | 35 | LPC_SYSCON->SYSAHBCLKCTRL0 &= ~(1 << 29); |
<> | 144:ef7eb2e8f9f7 | 36 | LPC_SWM->PINENABLE0 |= (1 << 24); |
<> | 144:ef7eb2e8f9f7 | 37 | } |
<> | 144:ef7eb2e8f9f7 | 38 | |
<> | 144:ef7eb2e8f9f7 | 39 | static inline void dac_write(int value) { |
<> | 144:ef7eb2e8f9f7 | 40 | value &= 0xFFF; // 12-bit |
<> | 144:ef7eb2e8f9f7 | 41 | |
<> | 144:ef7eb2e8f9f7 | 42 | // Set the DAC output |
<> | 144:ef7eb2e8f9f7 | 43 | LPC_DAC->VAL = (value << 4); |
<> | 144:ef7eb2e8f9f7 | 44 | } |
<> | 144:ef7eb2e8f9f7 | 45 | |
<> | 144:ef7eb2e8f9f7 | 46 | static inline int dac_read() { |
<> | 144:ef7eb2e8f9f7 | 47 | return ((LPC_DAC->VAL >> 4) & 0xFFF); |
<> | 144:ef7eb2e8f9f7 | 48 | } |
<> | 144:ef7eb2e8f9f7 | 49 | |
<> | 144:ef7eb2e8f9f7 | 50 | void analogout_write(dac_t *obj, float value) { |
<> | 144:ef7eb2e8f9f7 | 51 | if (value < 0.0f) { |
<> | 144:ef7eb2e8f9f7 | 52 | dac_write(0); |
<> | 144:ef7eb2e8f9f7 | 53 | } else if (value > 1.0f) { |
<> | 144:ef7eb2e8f9f7 | 54 | dac_write(0xFFF); |
<> | 144:ef7eb2e8f9f7 | 55 | } else { |
<> | 144:ef7eb2e8f9f7 | 56 | dac_write((uint32_t)(value * (float)0xFFF)); |
<> | 144:ef7eb2e8f9f7 | 57 | } |
<> | 144:ef7eb2e8f9f7 | 58 | } |
<> | 144:ef7eb2e8f9f7 | 59 | |
<> | 144:ef7eb2e8f9f7 | 60 | void analogout_write_u16(dac_t *obj, uint16_t value) { |
<> | 144:ef7eb2e8f9f7 | 61 | dac_write(value); |
<> | 144:ef7eb2e8f9f7 | 62 | } |
<> | 144:ef7eb2e8f9f7 | 63 | |
<> | 144:ef7eb2e8f9f7 | 64 | float analogout_read(dac_t *obj) { |
<> | 144:ef7eb2e8f9f7 | 65 | uint32_t value = dac_read(); |
<> | 144:ef7eb2e8f9f7 | 66 | return (float)value * (1.0f / (float)0xFFF); |
<> | 144:ef7eb2e8f9f7 | 67 | } |
<> | 144:ef7eb2e8f9f7 | 68 | |
<> | 144:ef7eb2e8f9f7 | 69 | uint16_t analogout_read_u16(dac_t *obj) { |
<> | 144:ef7eb2e8f9f7 | 70 | return (uint16_t)dac_read(); |
<> | 144:ef7eb2e8f9f7 | 71 | } |