Mouse code for the MacroRat
mbed-dev/targets/TARGET_Atmel/TARGET_SAM_CortexM4/analogin_api.c@46:b156ef445742, 2017-06-03 (annotated)
- Committer:
- sahilmgandhi
- Date:
- Sat Jun 03 00:22:44 2017 +0000
- Revision:
- 46:b156ef445742
- Parent:
- 18:6a4db94011d3
Final code for internal battlebot competition.
Who changed what in which revision?
User | Revision | Line number | New 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 | } |