mirror of https://github.com/ARMmbed/mbed-os.git
122 lines
4.5 KiB
C
122 lines
4.5 KiB
C
/*
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* Copyright (c) 2019, Nuvoton Technology Corporation
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "analogin_api.h"
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#if DEVICE_ANALOGIN
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#include "cmsis.h"
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#include "pinmap.h"
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#include "PeripheralPins.h"
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#include "nu_modutil.h"
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static uint32_t eadc_modinit_mask = 0;
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static const struct nu_modinit_s adc_modinit_tab[] = {
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{ADC_0_0, EADC_MODULE, 0, CLK_CLKDIV0_EADC(8), EADC_RST, EADC_INT0_IRQn, NULL},
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{ADC_0_1, EADC_MODULE, 0, CLK_CLKDIV0_EADC(8), EADC_RST, EADC_INT0_IRQn, NULL},
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{ADC_0_2, EADC_MODULE, 0, CLK_CLKDIV0_EADC(8), EADC_RST, EADC_INT0_IRQn, NULL},
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{ADC_0_3, EADC_MODULE, 0, CLK_CLKDIV0_EADC(8), EADC_RST, EADC_INT0_IRQn, NULL},
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{ADC_0_4, EADC_MODULE, 0, CLK_CLKDIV0_EADC(8), EADC_RST, EADC_INT0_IRQn, NULL},
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{ADC_0_5, EADC_MODULE, 0, CLK_CLKDIV0_EADC(8), EADC_RST, EADC_INT0_IRQn, NULL},
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{ADC_0_6, EADC_MODULE, 0, CLK_CLKDIV0_EADC(8), EADC_RST, EADC_INT0_IRQn, NULL},
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{ADC_0_7, EADC_MODULE, 0, CLK_CLKDIV0_EADC(8), EADC_RST, EADC_INT0_IRQn, NULL},
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{ADC_0_8, EADC_MODULE, 0, CLK_CLKDIV0_EADC(8), EADC_RST, EADC_INT0_IRQn, NULL},
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{ADC_0_9, EADC_MODULE, 0, CLK_CLKDIV0_EADC(8), EADC_RST, EADC_INT0_IRQn, NULL},
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{ADC_0_10, EADC_MODULE, 0, CLK_CLKDIV0_EADC(8), EADC_RST, EADC_INT0_IRQn, NULL},
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{ADC_0_11, EADC_MODULE, 0, CLK_CLKDIV0_EADC(8), EADC_RST, EADC_INT0_IRQn, NULL},
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{ADC_0_12, EADC_MODULE, 0, CLK_CLKDIV0_EADC(8), EADC_RST, EADC_INT0_IRQn, NULL},
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{ADC_0_13, EADC_MODULE, 0, CLK_CLKDIV0_EADC(8), EADC_RST, EADC_INT0_IRQn, NULL},
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{ADC_0_14, EADC_MODULE, 0, CLK_CLKDIV0_EADC(8), EADC_RST, EADC_INT0_IRQn, NULL},
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{ADC_0_15, EADC_MODULE, 0, CLK_CLKDIV0_EADC(8), EADC_RST, EADC_INT0_IRQn, NULL},
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};
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void analogin_init(analogin_t *obj, PinName pin)
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{
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obj->adc = (ADCName) pinmap_peripheral(pin, PinMap_ADC);
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MBED_ASSERT(obj->adc != (ADCName) NC);
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const struct nu_modinit_s *modinit = get_modinit(obj->adc, adc_modinit_tab);
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MBED_ASSERT(modinit != NULL);
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MBED_ASSERT(modinit->modname == (int) obj->adc);
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// Wire pinout
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pinmap_pinout(pin, PinMap_ADC);
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EADC_T *eadc_base = (EADC_T *) NU_MODBASE(obj->adc);
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// NOTE: All channels (identified by ADCName) share a ADC module. This reset will also affect other channels of the same ADC module.
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if (! eadc_modinit_mask) {
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// Select clock source
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CLK_SetModuleClock(modinit->clkidx, modinit->clksrc, modinit->clkdiv);
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// Enable clock
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CLK_EnableModuleClock(modinit->clkidx);
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// Reset this module if no channel enabled
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SYS_ResetModule(modinit->rsetidx);
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/* Configure EADC_module to be ready to convert
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* M251 doesn't support 'input mode' feature. Configure it to 0. */
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EADC_Open(eadc_base, 0);
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}
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uint32_t chn = NU_MODSUBINDEX(obj->adc);
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// Configure the sample module Nmod for analog input channel Nch and software trigger source
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EADC_ConfigSampleModule(eadc_base, chn, EADC_SOFTWARE_TRIGGER, chn);
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/* Extend sampling time (in EADC clocks)
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*
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* Some targets like NUMAKER_M252KG may fail to pass CI Test Shield test
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* without extending sampling time.
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*/
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EADC_SetExtendSampleTime(eadc_base, chn, 10);
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eadc_modinit_mask |= 1 << chn;
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}
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uint16_t analogin_read_u16(analogin_t *obj)
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{
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EADC_T *eadc_base = (EADC_T *) NU_MODBASE(obj->adc);
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uint32_t chn = NU_MODSUBINDEX(obj->adc);
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EADC_START_CONV(eadc_base, 1 << chn);
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while (EADC_GET_DATA_VALID_FLAG(eadc_base, 1 << chn) != ((uint32_t) (1 << chn)));
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uint16_t conv_res_12 = EADC_GET_CONV_DATA(eadc_base, chn);
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// Just 12 bits are effective. Convert to 16 bits.
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// conv_res_12: 0000 b11b10b9b8 b7b6b5b4 b3b2b1b0
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// conv_res_16: b11b10b9b8 b7b6b5b4 b3b2b1b0 b11b10b9b8
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uint16_t conv_res_16 = (conv_res_12 << 4) | (conv_res_12 >> 8);
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return conv_res_16;
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}
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float analogin_read(analogin_t *obj)
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{
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uint16_t value = analogin_read_u16(obj);
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return (float) value * (1.0f / (float) 0xFFFF);
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}
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const PinMap *analogin_pinmap()
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{
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return PinMap_ADC;
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}
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#endif
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