mbed library sources
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Diff: targets/hal/TARGET_Atmel/TARGET_SAM21/analogin_api.c
- Revision:
- 592:a274ee790e56
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/targets/hal/TARGET_Atmel/TARGET_SAM21/analogin_api.c Fri Jul 17 09:15:10 2015 +0100 @@ -0,0 +1,181 @@ +/* mbed Microcontroller Library + * Copyright (c) 2006-2013 ARM Limited + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ +#include "mbed_assert.h" +#include "analogin_api.h" + +#include "cmsis.h" +#include "pinmap.h" +#include "PeripheralPins.h" +#include "adc.h" +#include "status_codes.h" + +struct adc_module adc_instance; + +void adc_configure_ain_pin(uint32_t pin) +{ +#define PIN_INVALID_ADC_AIN 0xFFFFUL + + /* Pinmapping table for AINxx -> GPIO pin number */ + const uint32_t pinmapping[] = { +#if (SAMD20E | SAMD21E) + PIN_PA02B_ADC_AIN0, PIN_PA03B_ADC_AIN1, + PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN, + PIN_PA04B_ADC_AIN4, PIN_PA05B_ADC_AIN5, + PIN_PA06B_ADC_AIN6, PIN_PA07B_ADC_AIN7, + PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN, + PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN, + PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN, + PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN, + PIN_PA08B_ADC_AIN16, PIN_PA09B_ADC_AIN17, + PIN_PA10B_ADC_AIN18, PIN_PA11B_ADC_AIN19, +#elif (SAMD20G | SAMD21G) + PIN_PA02B_ADC_AIN0, PIN_PA03B_ADC_AIN1, + PIN_PB08B_ADC_AIN2, PIN_PB09B_ADC_AIN3, + PIN_PA04B_ADC_AIN4, PIN_PA05B_ADC_AIN5, + PIN_PA06B_ADC_AIN6, PIN_PA07B_ADC_AIN7, + PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN, + PIN_PB02B_ADC_AIN10, PIN_PB03B_ADC_AIN11, + PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN, + PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN, + PIN_PA08B_ADC_AIN16, PIN_PA09B_ADC_AIN17, + PIN_PA10B_ADC_AIN18, PIN_PA11B_ADC_AIN19, +#elif (SAMD20J | SAMD21J) + PIN_PA02B_ADC_AIN0, PIN_PA03B_ADC_AIN1, + PIN_PB08B_ADC_AIN2, PIN_PB09B_ADC_AIN3, + PIN_PA04B_ADC_AIN4, PIN_PA05B_ADC_AIN5, + PIN_PA06B_ADC_AIN6, PIN_PA07B_ADC_AIN7, + PIN_PB00B_ADC_AIN8, PIN_PB01B_ADC_AIN9, + PIN_PB02B_ADC_AIN10, PIN_PB03B_ADC_AIN11, + PIN_PB04B_ADC_AIN12, PIN_PB05B_ADC_AIN13, + PIN_PB06B_ADC_AIN14, PIN_PB07B_ADC_AIN15, + PIN_PA08B_ADC_AIN16, PIN_PA09B_ADC_AIN17, + PIN_PA10B_ADC_AIN18, PIN_PA11B_ADC_AIN19, +#elif SAMR21E + PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN, + PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN, + PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN, + PIN_PA06B_ADC_AIN6, PIN_PA07B_ADC_AIN7, + PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN, + PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN, + PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN, + PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN, + PIN_PA08B_ADC_AIN16, PIN_PA09B_ADC_AIN17, + PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN, +#elif SAMR21G + PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN, + PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN, + PIN_PA04B_ADC_AIN4, PIN_PA05B_ADC_AIN5, + PIN_PA06B_ADC_AIN6, PIN_PA07B_ADC_AIN7, + PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN, + PIN_PB02B_ADC_AIN10, PIN_PB03B_ADC_AIN11, + PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN, + PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN, + PIN_PA08B_ADC_AIN16, PIN_PA09B_ADC_AIN17, + PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN, +#elif (SAMD10C | SAMD11C) + PIN_PA02B_ADC_AIN0, PIN_INVALID_ADC_AIN, + PIN_PA04B_ADC_AIN2, PIN_PA05B_ADC_AIN3, + PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN, + PIN_PA14B_ADC_AIN6, PIN_PA15B_ADC_AIN7, + PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN, + PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN, + PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN, + PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN, + PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN, + PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN, +#elif (SAMD10DS | SAMD11DS) + PIN_PA02B_ADC_AIN0, PIN_INVALID_ADC_AIN, + PIN_PA04B_ADC_AIN2, PIN_PA05B_ADC_AIN3, + PIN_PA06B_ADC_AIN4, PIN_PA07B_ADC_AIN5, + PIN_PA14B_ADC_AIN6, PIN_PA15B_ADC_AIN7, + PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN, + PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN, + PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN, + PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN, + PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN, + PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN, +#elif (SAMD10DM | SAMD11DM) + PIN_PA02B_ADC_AIN0, PIN_PA03B_ADC_AIN1, + PIN_PA04B_ADC_AIN2, PIN_PA05B_ADC_AIN3, + PIN_PA06B_ADC_AIN4, PIN_PA07B_ADC_AIN5, + PIN_PA14B_ADC_AIN6, PIN_PA15B_ADC_AIN7, + PIN_PA10B_ADC_AIN8, PIN_PA11B_ADC_AIN9, + PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN, + PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN, + PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN, + PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN, + PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN, +#else +# error ADC pin mappings are not defined for this device. +#endif + }; + + uint32_t pin_map_result = PIN_INVALID_ADC_AIN; + + if (pin <= ADC_EXTCHANNEL_MSB) { + pin_map_result = pinmapping[pin >> ADC_INPUTCTRL_MUXPOS_Pos]; + + Assert(pin_map_result != PIN_INVALID_ADC_AIN); + + struct system_pinmux_config config; + system_pinmux_get_config_defaults(&config); + + /* Analog functions are all on MUX setting B */ + config.input_pull = SYSTEM_PINMUX_PIN_PULL_NONE; + config.mux_position = 1; + + system_pinmux_pin_set_config(pin_map_result, &config); + } +} + +void analogin_init(analogin_t *obj, PinName pin) +{ + uint32_t pos_input; + static uint8_t init_flag = 0; + + pos_input = pinmap_find_peripheral(pin, PinMap_ADC); + MBED_ASSERT(pos_input != NC); + + adc_get_config_defaults(&(obj->config_adc)); + obj->config_adc.positive_input = pos_input; + if (init_flag == 0) { // ADC init and enable to be done only once. + adc_init(&adc_instance, ADC, &(obj->config_adc)); + adc_enable(&adc_instance); + init_flag = 1; + } else { // pin muxing + adc_configure_ain_pin(obj->config_adc.positive_input); + adc_configure_ain_pin(obj->config_adc.negative_input); + } +} + +uint16_t analogin_read_u16(analogin_t *obj) +{ + uint16_t result; + adc_set_positive_input(&adc_instance, obj->config_adc.positive_input); + adc_set_negative_input(&adc_instance, obj->config_adc.negative_input); + adc_start_conversion(&adc_instance); + do { + } while(adc_read(&(adc_instance), &result) == STATUS_BUSY); // 12 bit value + + return (uint16_t)((result * 65535) / 4095); // for normalizing to 16 bit value +} + +float analogin_read(analogin_t *obj) +{ + uint16_t value = analogin_read_u16(obj); + return (float)value * (1.0f / (float)0xFFFF); +} +