MacroRat / MouseCode

Mouse code for the MacroRat

Dependencies:   ITG3200 QEI

mbed-dev/targets/TARGET_NORDIC/TARGET_NRF5/TARGET_MCU_NRF52832/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?

UserRevisionLine numberNew contents of line
sahilmgandhi 18:6a4db94011d3 1 /* mbed Microcontroller Library
sahilmgandhi 18:6a4db94011d3 2 * Copyright (c) 2006-2013 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
sahilmgandhi 18:6a4db94011d3 17 #include "mbed_assert.h"
sahilmgandhi 18:6a4db94011d3 18 #include "analogin_api.h"
sahilmgandhi 18:6a4db94011d3 19 #include "cmsis.h"
sahilmgandhi 18:6a4db94011d3 20 #include "pinmap.h"
sahilmgandhi 18:6a4db94011d3 21 #include "app_util_platform.h"
sahilmgandhi 18:6a4db94011d3 22 #include "nrf_drv_saadc.h"
sahilmgandhi 18:6a4db94011d3 23
sahilmgandhi 18:6a4db94011d3 24 #ifdef DEVICE_ANALOGIN
sahilmgandhi 18:6a4db94011d3 25
sahilmgandhi 18:6a4db94011d3 26 #define ADC_12BIT_RANGE 0xFFF
sahilmgandhi 18:6a4db94011d3 27 #define ADC_RANGE ADC_12BIT_RANGE
sahilmgandhi 18:6a4db94011d3 28
sahilmgandhi 18:6a4db94011d3 29 static void analog_in_event_handler(nrf_drv_saadc_evt_t const *p_event)// type of nrf_drv_saadc_event_handler_t
sahilmgandhi 18:6a4db94011d3 30 {
sahilmgandhi 18:6a4db94011d3 31 (void) p_event;
sahilmgandhi 18:6a4db94011d3 32 }
sahilmgandhi 18:6a4db94011d3 33
sahilmgandhi 18:6a4db94011d3 34 static const nrf_drv_saadc_config_t saadc_config =
sahilmgandhi 18:6a4db94011d3 35 {
sahilmgandhi 18:6a4db94011d3 36 .resolution = NRF_SAADC_RESOLUTION_12BIT,
sahilmgandhi 18:6a4db94011d3 37 .oversample = NRF_SAADC_OVERSAMPLE_DISABLED,
sahilmgandhi 18:6a4db94011d3 38 .interrupt_priority = SAADC_CONFIG_IRQ_PRIORITY
sahilmgandhi 18:6a4db94011d3 39 };
sahilmgandhi 18:6a4db94011d3 40
sahilmgandhi 18:6a4db94011d3 41 void SAADC_IRQHandler(void);
sahilmgandhi 18:6a4db94011d3 42
sahilmgandhi 18:6a4db94011d3 43 void analogin_init(analogin_t *obj, PinName pin)
sahilmgandhi 18:6a4db94011d3 44 {
sahilmgandhi 18:6a4db94011d3 45 ret_code_t ret_code;
sahilmgandhi 18:6a4db94011d3 46
sahilmgandhi 18:6a4db94011d3 47 NVIC_SetVector(SAADC_IRQn, (uint32_t)SAADC_IRQHandler);
sahilmgandhi 18:6a4db94011d3 48
sahilmgandhi 18:6a4db94011d3 49 ret_code = nrf_drv_saadc_init(&saadc_config, analog_in_event_handler);
sahilmgandhi 18:6a4db94011d3 50 MBED_ASSERT(((ret_code == NRF_SUCCESS) || (ret_code == NRF_ERROR_INVALID_STATE))); //NRF_ERROR_INVALID_STATE expected for multiple channels used.
sahilmgandhi 18:6a4db94011d3 51
sahilmgandhi 18:6a4db94011d3 52 uint8_t saadcIn = nrf_drv_saadc_gpio_to_ain(pin);
sahilmgandhi 18:6a4db94011d3 53 MBED_ASSERT(saadcIn != NRF_SAADC_INPUT_DISABLED);
sahilmgandhi 18:6a4db94011d3 54
sahilmgandhi 18:6a4db94011d3 55 obj->adc = ADC0_0; // only one instance of ADC in nRF52 SoC
sahilmgandhi 18:6a4db94011d3 56 obj->adc_pin = saadcIn - 1;
sahilmgandhi 18:6a4db94011d3 57
sahilmgandhi 18:6a4db94011d3 58 nrf_saadc_channel_config_t channel_config =
sahilmgandhi 18:6a4db94011d3 59 NRF_DRV_SAADC_DEFAULT_CHANNEL_CONFIG_SE(saadcIn); //Single ended, negative input to ADC shorted to GND.
sahilmgandhi 18:6a4db94011d3 60
sahilmgandhi 18:6a4db94011d3 61 ret_code = nrf_drv_saadc_channel_init(obj->adc_pin, &channel_config);
sahilmgandhi 18:6a4db94011d3 62 MBED_ASSERT(ret_code == NRF_SUCCESS);
sahilmgandhi 18:6a4db94011d3 63 }
sahilmgandhi 18:6a4db94011d3 64
sahilmgandhi 18:6a4db94011d3 65
sahilmgandhi 18:6a4db94011d3 66 uint16_t analogin_read_u16(analogin_t *obj)
sahilmgandhi 18:6a4db94011d3 67 {
sahilmgandhi 18:6a4db94011d3 68 int16_t adc_value;
sahilmgandhi 18:6a4db94011d3 69 ret_code_t ret_code;
sahilmgandhi 18:6a4db94011d3 70
sahilmgandhi 18:6a4db94011d3 71 ret_code = nrf_drv_saadc_sample_convert(obj->adc_pin, &adc_value);
sahilmgandhi 18:6a4db94011d3 72 MBED_ASSERT(ret_code == NRF_SUCCESS);
sahilmgandhi 18:6a4db94011d3 73
sahilmgandhi 18:6a4db94011d3 74 if (adc_value < 0)
sahilmgandhi 18:6a4db94011d3 75 {
sahilmgandhi 18:6a4db94011d3 76 // Even in the single ended mode measured value can be {-0}. Saturation for avoid casting to a big integer.
sahilmgandhi 18:6a4db94011d3 77 return 0;
sahilmgandhi 18:6a4db94011d3 78 }
sahilmgandhi 18:6a4db94011d3 79 else
sahilmgandhi 18:6a4db94011d3 80 {
sahilmgandhi 18:6a4db94011d3 81 return (uint16_t) adc_value;
sahilmgandhi 18:6a4db94011d3 82 }
sahilmgandhi 18:6a4db94011d3 83 }
sahilmgandhi 18:6a4db94011d3 84
sahilmgandhi 18:6a4db94011d3 85 float analogin_read(analogin_t *obj)
sahilmgandhi 18:6a4db94011d3 86 {
sahilmgandhi 18:6a4db94011d3 87 uint16_t value = analogin_read_u16(obj);
sahilmgandhi 18:6a4db94011d3 88 return (float)value * (1.0f / (float)ADC_RANGE);
sahilmgandhi 18:6a4db94011d3 89 }
sahilmgandhi 18:6a4db94011d3 90
sahilmgandhi 18:6a4db94011d3 91 #endif // DEVICE_ANALOGIN