MacroRat / MouseCode

Mouse code for the MacroRat

Dependencies:   ITG3200 QEI

mbed-dev/targets/TARGET_Atmel/TARGET_SAM_CortexM4/analogin_api.c@18:6a4db94011d3, 2017-05-14 (annotated)

Committer:
sahilmgandhi
Date:
Sun May 14 23:18:57 2017 +0000
Revision:
18:6a4db94011d3
Publishing again

Who changed what in which revision?

UserRevisionLine numberNew contents of line
sahilmgandhi 18:6a4db94011d3 1 /* mbed Microcontroller Library
sahilmgandhi 18:6a4db94011d3 2 * Copyright (c) 2006-2015 ARM Limited
sahilmgandhi 18:6a4db94011d3 3 *
sahilmgandhi 18:6a4db94011d3 4 * Licensed under the Apache License, Version 2.0 (the "License");
sahilmgandhi 18:6a4db94011d3 5 * you may not use this file except in compliance with the License.
sahilmgandhi 18:6a4db94011d3 6 * You may obtain a copy of the License at
sahilmgandhi 18:6a4db94011d3 7 *
sahilmgandhi 18:6a4db94011d3 8 * http://www.apache.org/licenses/LICENSE-2.0
sahilmgandhi 18:6a4db94011d3 9 *
sahilmgandhi 18:6a4db94011d3 10 * Unless required by applicable law or agreed to in writing, software
sahilmgandhi 18:6a4db94011d3 11 * distributed under the License is distributed on an "AS IS" BASIS,
sahilmgandhi 18:6a4db94011d3 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
sahilmgandhi 18:6a4db94011d3 13 * See the License for the specific language governing permissions and
sahilmgandhi 18:6a4db94011d3 14 * limitations under the License.
sahilmgandhi 18:6a4db94011d3 15 */
sahilmgandhi 18:6a4db94011d3 16 #include "mbed_assert.h"
sahilmgandhi 18:6a4db94011d3 17 #include "analogin_api.h"
sahilmgandhi 18:6a4db94011d3 18 #include "cmsis.h"
sahilmgandhi 18:6a4db94011d3 19 #include "adc2.h"
sahilmgandhi 18:6a4db94011d3 20 #include "PeripheralPins.h"
sahilmgandhi 18:6a4db94011d3 21
sahilmgandhi 18:6a4db94011d3 22 extern uint8_t g_sys_init;
sahilmgandhi 18:6a4db94011d3 23 static uint8_t adc_inited = 0;
sahilmgandhi 18:6a4db94011d3 24
sahilmgandhi 18:6a4db94011d3 25 void analogin_init(analogin_t *obj, PinName pin)
sahilmgandhi 18:6a4db94011d3 26 {
sahilmgandhi 18:6a4db94011d3 27 MBED_ASSERT(obj);
sahilmgandhi 18:6a4db94011d3 28 if (g_sys_init == 0) {
sahilmgandhi 18:6a4db94011d3 29 sysclk_init();
sahilmgandhi 18:6a4db94011d3 30 system_board_init();
sahilmgandhi 18:6a4db94011d3 31 g_sys_init = 1;
sahilmgandhi 18:6a4db94011d3 32 }
sahilmgandhi 18:6a4db94011d3 33 obj->channel = (enum adc_channel_num)pinmap_peripheral(pin, PinMap_ADC);
sahilmgandhi 18:6a4db94011d3 34 MBED_ASSERT(obj->channel != NC);
sahilmgandhi 18:6a4db94011d3 35 if(!adc_inited) { /*ADC hardare to be initialised only once*/
sahilmgandhi 18:6a4db94011d3 36 adc_enable();
sahilmgandhi 18:6a4db94011d3 37 #if SAMG55
sahilmgandhi 18:6a4db94011d3 38 adc_select_clock_source_mck(ADC);
sahilmgandhi 18:6a4db94011d3 39 #endif
sahilmgandhi 18:6a4db94011d3 40 struct adc_config adc_cfg;
sahilmgandhi 18:6a4db94011d3 41 adc_get_config_defaults(&adc_cfg);
sahilmgandhi 18:6a4db94011d3 42 adc_cfg.resolution = ADC_16_BITS;
sahilmgandhi 18:6a4db94011d3 43 adc_init(ADC, &adc_cfg);
sahilmgandhi 18:6a4db94011d3 44 adc_average_on_single_trigger(ADC);
sahilmgandhi 18:6a4db94011d3 45 adc_set_trigger(ADC, ADC_TRIG_SW);
sahilmgandhi 18:6a4db94011d3 46 adc_start_calibration(ADC);
sahilmgandhi 18:6a4db94011d3 47 adc_inited = 1;
sahilmgandhi 18:6a4db94011d3 48 }
sahilmgandhi 18:6a4db94011d3 49 adc_channel_enable(ADC, obj->channel);
sahilmgandhi 18:6a4db94011d3 50 }
sahilmgandhi 18:6a4db94011d3 51
sahilmgandhi 18:6a4db94011d3 52 uint16_t analogin_read_u16(analogin_t *obj)
sahilmgandhi 18:6a4db94011d3 53 {
sahilmgandhi 18:6a4db94011d3 54 MBED_ASSERT(obj);
sahilmgandhi 18:6a4db94011d3 55 adc_channel_get_value(ADC, obj->channel); /*Dummy read of current value*/
sahilmgandhi 18:6a4db94011d3 56 adc_start_software_conversion(ADC);
sahilmgandhi 18:6a4db94011d3 57 while (adc_get_interrupt_status(ADC) & (1 << obj->channel));
sahilmgandhi 18:6a4db94011d3 58 return (uint16_t)adc_channel_get_value(ADC, obj->channel);
sahilmgandhi 18:6a4db94011d3 59 }
sahilmgandhi 18:6a4db94011d3 60
sahilmgandhi 18:6a4db94011d3 61 float analogin_read(analogin_t *obj)
sahilmgandhi 18:6a4db94011d3 62 {
sahilmgandhi 18:6a4db94011d3 63 MBED_ASSERT(obj);
sahilmgandhi 18:6a4db94011d3 64 uint16_t value = analogin_read_u16(obj);
sahilmgandhi 18:6a4db94011d3 65 return (float)value * (1.0f / (float)0xFFFF);
sahilmgandhi 18:6a4db94011d3 66 }