david dicarlo / mbed-src-FLL48

mbed library sources: Modified to operate FRDM-KL25Z at 48MHz from internal 32kHz oscillator (nothing else changed).

Fork of mbed-src by mbed official

The only file that changed is: mbed-src-FLL48/targets/cmsis/TARGET_Freescale/TARGET_KL25Z/system_MKL25Z4.h

targets/hal/TARGET_STM/TARGET_STM32F4XX/analogin_api.c@20:4263a77256ae, 2013-09-10 (annotated)

Committer:
bogdanm
Date:
Tue Sep 10 15:14:19 2013 +0300
Revision:
20:4263a77256ae
Sync with git revision 171dda705c947bf910926a0b73d6a4797802554d

Who changed what in which revision?

UserRevisionLine numberNew contents of line
bogdanm 20:4263a77256ae 1 /* mbed Microcontroller Library
bogdanm 20:4263a77256ae 2 * Copyright (c) 2006-2013 ARM Limited
bogdanm 20:4263a77256ae 3 *
bogdanm 20:4263a77256ae 4 * Licensed under the Apache License, Version 2.0 (the "License");
bogdanm 20:4263a77256ae 5 * you may not use this file except in compliance with the License.
bogdanm 20:4263a77256ae 6 * You may obtain a copy of the License at
bogdanm 20:4263a77256ae 7 *
bogdanm 20:4263a77256ae 8 * http://www.apache.org/licenses/LICENSE-2.0
bogdanm 20:4263a77256ae 9 *
bogdanm 20:4263a77256ae 10 * Unless required by applicable law or agreed to in writing, software
bogdanm 20:4263a77256ae 11 * distributed under the License is distributed on an "AS IS" BASIS,
bogdanm 20:4263a77256ae 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
bogdanm 20:4263a77256ae 13 * See the License for the specific language governing permissions and
bogdanm 20:4263a77256ae 14 * limitations under the License.
bogdanm 20:4263a77256ae 15 */
bogdanm 20:4263a77256ae 16 #include "analogin_api.h"
bogdanm 20:4263a77256ae 17
bogdanm 20:4263a77256ae 18 #if DEVICE_ANALOGIN
bogdanm 20:4263a77256ae 19
bogdanm 20:4263a77256ae 20 #include "cmsis.h"
bogdanm 20:4263a77256ae 21 #include "pinmap.h"
bogdanm 20:4263a77256ae 22 #include "error.h"
bogdanm 20:4263a77256ae 23
bogdanm 20:4263a77256ae 24 #define ADC_10BIT_RANGE 0x3FF
bogdanm 20:4263a77256ae 25 #define ADC_12BIT_RANGE 0xFFF
bogdanm 20:4263a77256ae 26
bogdanm 20:4263a77256ae 27 static const PinMap PinMap_ADC[] = {
bogdanm 20:4263a77256ae 28 {PA_0, ADC0_0, STM_PIN_DATA(3, 0)},
bogdanm 20:4263a77256ae 29 {PA_1, ADC0_1, STM_PIN_DATA(3, 0)},
bogdanm 20:4263a77256ae 30 {PA_2, ADC0_2, STM_PIN_DATA(3, 0)},
bogdanm 20:4263a77256ae 31 {PA_3, ADC0_3, STM_PIN_DATA(3, 0)},
bogdanm 20:4263a77256ae 32 {PA_4, ADC0_4, STM_PIN_DATA(3, 0)},
bogdanm 20:4263a77256ae 33 {PA_5, ADC0_5, STM_PIN_DATA(3, 0)},
bogdanm 20:4263a77256ae 34 {PA_6, ADC0_6, STM_PIN_DATA(3, 0)},
bogdanm 20:4263a77256ae 35 {PA_7, ADC0_7, STM_PIN_DATA(3, 0)},
bogdanm 20:4263a77256ae 36 {PB_0, ADC0_8, STM_PIN_DATA(3, 0)},
bogdanm 20:4263a77256ae 37 {PB_1, ADC0_9, STM_PIN_DATA(3, 0)},
bogdanm 20:4263a77256ae 38 {PC_0, ADC0_10, STM_PIN_DATA(3, 0)},
bogdanm 20:4263a77256ae 39 {PC_1, ADC0_11, STM_PIN_DATA(3, 0)},
bogdanm 20:4263a77256ae 40 {PC_2, ADC0_12, STM_PIN_DATA(3, 0)},
bogdanm 20:4263a77256ae 41 {PC_3, ADC0_13, STM_PIN_DATA(3, 0)},
bogdanm 20:4263a77256ae 42 {PC_4, ADC0_14, STM_PIN_DATA(3, 0)},
bogdanm 20:4263a77256ae 43 {PC_5, ADC0_15, STM_PIN_DATA(3, 0)},
bogdanm 20:4263a77256ae 44 {NC, NC, 0}
bogdanm 20:4263a77256ae 45 };
bogdanm 20:4263a77256ae 46
bogdanm 20:4263a77256ae 47 # define ADC_RANGE ADC_12BIT_RANGE
bogdanm 20:4263a77256ae 48
bogdanm 20:4263a77256ae 49 void analogin_init(analogin_t *obj, PinName pin) {
bogdanm 20:4263a77256ae 50 obj->adc = (ADCName)pinmap_peripheral(pin, PinMap_ADC);
bogdanm 20:4263a77256ae 51 if (obj->adc == (uint32_t)NC) {
bogdanm 20:4263a77256ae 52 error("ADC pin mapping failed");
bogdanm 20:4263a77256ae 53 }
bogdanm 20:4263a77256ae 54
bogdanm 20:4263a77256ae 55 // ensure power is turned on
bogdanm 20:4263a77256ae 56 RCC->AHB1ENR |= RCC_AHB1ENR_GPIOAEN | RCC_AHB1ENR_GPIOBEN |
bogdanm 20:4263a77256ae 57 RCC_AHB1ENR_GPIOCEN;
bogdanm 20:4263a77256ae 58 RCC->APB2ENR |= RCC_APB2ENR_ADC1EN;
bogdanm 20:4263a77256ae 59
bogdanm 20:4263a77256ae 60 // Enable the ADC
bogdanm 20:4263a77256ae 61 ADC1->CR2 |= ADC_CR2_ADON;
bogdanm 20:4263a77256ae 62
bogdanm 20:4263a77256ae 63 pinmap_pinout(pin, PinMap_ADC);
bogdanm 20:4263a77256ae 64 }
bogdanm 20:4263a77256ae 65
bogdanm 20:4263a77256ae 66 static inline uint32_t adc_read(analogin_t *obj) {
bogdanm 20:4263a77256ae 67 // Select the appropriate channel
bogdanm 20:4263a77256ae 68 ADC1->SQR3 = (int) obj->adc;
bogdanm 20:4263a77256ae 69
bogdanm 20:4263a77256ae 70 // Start conversion
bogdanm 20:4263a77256ae 71 ADC1->CR2 |= ADC_CR2_SWSTART;
bogdanm 20:4263a77256ae 72
bogdanm 20:4263a77256ae 73 // Wait for conversion to finish
bogdanm 20:4263a77256ae 74 while (!(ADC1->SR & ADC_SR_EOC));
bogdanm 20:4263a77256ae 75
bogdanm 20:4263a77256ae 76 uint32_t data = ADC1->DR;
bogdanm 20:4263a77256ae 77 return data; // 12 bit
bogdanm 20:4263a77256ae 78 }
bogdanm 20:4263a77256ae 79
bogdanm 20:4263a77256ae 80 static inline uint32_t adc_read_u32(analogin_t *obj) {
bogdanm 20:4263a77256ae 81 uint32_t value;
bogdanm 20:4263a77256ae 82 value = adc_read(obj);
bogdanm 20:4263a77256ae 83 return value;
bogdanm 20:4263a77256ae 84 }
bogdanm 20:4263a77256ae 85
bogdanm 20:4263a77256ae 86 uint16_t analogin_read_u16(analogin_t *obj) {
bogdanm 20:4263a77256ae 87 uint32_t value = adc_read_u32(obj);
bogdanm 20:4263a77256ae 88
bogdanm 20:4263a77256ae 89 return (value << 4) | ((value >> 8) & 0x000F); // 12 bit
bogdanm 20:4263a77256ae 90 }
bogdanm 20:4263a77256ae 91
bogdanm 20:4263a77256ae 92 float analogin_read(analogin_t *obj) {
bogdanm 20:4263a77256ae 93 uint32_t value = adc_read_u32(obj);
bogdanm 20:4263a77256ae 94 return (float)value * (1.0f / (float)ADC_RANGE);
bogdanm 20:4263a77256ae 95 }
bogdanm 20:4263a77256ae 96
bogdanm 20:4263a77256ae 97 #endif