/* * Copyright (c) 2019, Nuvoton Technology Corporation * * SPDX-License-Identifier: Apache-2.0 * * 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 "analogin_api.h" #if DEVICE_ANALOGIN #include "cmsis.h" #include "pinmap.h" #include "PeripheralPins.h" #include "nu_modutil.h" #include "hal/PinNameAliases.h" static uint32_t eadc_modinit_mask = 0; static const struct nu_modinit_s adc_modinit_tab[] = { {ADC_0_0, EADC_MODULE, 0, CLK_CLKDIV0_EADC(8), EADC_RST, EADC_INT0_IRQn, NULL}, {ADC_0_1, EADC_MODULE, 0, CLK_CLKDIV0_EADC(8), EADC_RST, EADC_INT0_IRQn, NULL}, {ADC_0_2, EADC_MODULE, 0, CLK_CLKDIV0_EADC(8), EADC_RST, EADC_INT0_IRQn, NULL}, {ADC_0_3, EADC_MODULE, 0, CLK_CLKDIV0_EADC(8), EADC_RST, EADC_INT0_IRQn, NULL}, {ADC_0_4, EADC_MODULE, 0, CLK_CLKDIV0_EADC(8), EADC_RST, EADC_INT0_IRQn, NULL}, {ADC_0_5, EADC_MODULE, 0, CLK_CLKDIV0_EADC(8), EADC_RST, EADC_INT0_IRQn, NULL}, {ADC_0_6, EADC_MODULE, 0, CLK_CLKDIV0_EADC(8), EADC_RST, EADC_INT0_IRQn, NULL}, {ADC_0_7, EADC_MODULE, 0, CLK_CLKDIV0_EADC(8), EADC_RST, EADC_INT0_IRQn, NULL}, {ADC_0_8, EADC_MODULE, 0, CLK_CLKDIV0_EADC(8), EADC_RST, EADC_INT0_IRQn, NULL}, {ADC_0_9, EADC_MODULE, 0, CLK_CLKDIV0_EADC(8), EADC_RST, EADC_INT0_IRQn, NULL}, {ADC_0_10, EADC_MODULE, 0, CLK_CLKDIV0_EADC(8), EADC_RST, EADC_INT0_IRQn, NULL}, {ADC_0_11, EADC_MODULE, 0, CLK_CLKDIV0_EADC(8), EADC_RST, EADC_INT0_IRQn, NULL}, {ADC_0_12, EADC_MODULE, 0, CLK_CLKDIV0_EADC(8), EADC_RST, EADC_INT0_IRQn, NULL}, {ADC_0_13, EADC_MODULE, 0, CLK_CLKDIV0_EADC(8), EADC_RST, EADC_INT0_IRQn, NULL}, {ADC_0_14, EADC_MODULE, 0, CLK_CLKDIV0_EADC(8), EADC_RST, EADC_INT0_IRQn, NULL}, {ADC_0_15, EADC_MODULE, 0, CLK_CLKDIV0_EADC(8), EADC_RST, EADC_INT0_IRQn, NULL}, }; #if defined(MBED_CONF_TARGET_EADC_EXTSMPT_LIST) /* Structure for extending sampling time on per-pin basis */ struct nu_eadc_extsmpt { PinName pin; uint32_t value; }; static struct nu_eadc_extsmpt eadc_extsmpt_arr[] = { MBED_CONF_TARGET_EADC_EXTSMPT_LIST }; #endif void analogin_init(analogin_t *obj, PinName pin) { obj->adc = (ADCName) pinmap_peripheral(pin, PinMap_ADC); MBED_ASSERT(obj->adc != (ADCName) NC); const struct nu_modinit_s *modinit = get_modinit(obj->adc, adc_modinit_tab); MBED_ASSERT(modinit != NULL); MBED_ASSERT(modinit->modname == (int) obj->adc); obj->pin = pin; // Wire pinout pinmap_pinout(pin, PinMap_ADC); EADC_T *eadc_base = (EADC_T *) NU_MODBASE(obj->adc); // NOTE: All channels (identified by ADCName) share a ADC module. This reset will also affect other channels of the same ADC module. if (! eadc_modinit_mask) { // Select clock source CLK_SetModuleClock(modinit->clkidx, modinit->clksrc, modinit->clkdiv); // Enable clock CLK_EnableModuleClock(modinit->clkidx); // Reset this module if no channel enabled SYS_ResetModule(modinit->rsetidx); /* Configure EADC_module to be ready to convert * M251 doesn't support 'input mode' feature. Configure it to 0. */ EADC_Open(eadc_base, 0); } uint32_t chn = NU_MODSUBINDEX(obj->adc); // Configure the sample module Nmod for analog input channel Nch and software trigger source EADC_ConfigSampleModule(eadc_base, chn, EADC_SOFTWARE_TRIGGER, chn); /* Extend sampling time (in EADC clocks) * * Some targets like NUMAKER_M252KG may fail to pass CI Test Shield test * without extending sampling time. */ EADC_SetExtendSampleTime(eadc_base, chn, 10); #if defined(MBED_CONF_TARGET_EADC_EXTSMPT_LIST) // Extend sampling time in EADC clocks on per-pin basis struct nu_eadc_extsmpt *eadc_extsmpt_pos = eadc_extsmpt_arr; struct nu_eadc_extsmpt *eadc_extsmpt_end = eadc_extsmpt_arr + sizeof (eadc_extsmpt_arr) / sizeof (eadc_extsmpt_arr[0]); for (; eadc_extsmpt_pos != eadc_extsmpt_end; eadc_extsmpt_pos ++) { if (eadc_extsmpt_pos->pin == pin) { EADC_SetExtendSampleTime(eadc_base, chn, eadc_extsmpt_pos->value); break; } } #endif eadc_modinit_mask |= 1 << chn; } void analogin_free(analogin_t *obj) { const struct nu_modinit_s *modinit = get_modinit(obj->adc, adc_modinit_tab); MBED_ASSERT(modinit->modname == (int) obj->adc); /* Module subindex (aka channel) */ uint32_t chn = NU_MODSUBINDEX(obj->adc); EADC_T *eadc_base = (EADC_T *) NU_MODBASE(obj->adc); /* Channel-level windup from here */ /* Mark channel free */ eadc_modinit_mask &= ~(1 << chn); /* Module-level windup from here */ /* See analogin_init() for reason */ if (! eadc_modinit_mask) { /* Disable EADC module */ EADC_Close(eadc_base); /* Disable IP clock */ CLK_DisableModuleClock(modinit->clkidx); } /* Free up pins */ gpio_set(obj->pin); obj->pin = NC; } uint16_t analogin_read_u16(analogin_t *obj) { EADC_T *eadc_base = (EADC_T *) NU_MODBASE(obj->adc); uint32_t chn = NU_MODSUBINDEX(obj->adc); EADC_START_CONV(eadc_base, 1 << chn); while (EADC_GET_DATA_VALID_FLAG(eadc_base, 1 << chn) != ((uint32_t) (1 << chn))); uint16_t conv_res_12 = EADC_GET_CONV_DATA(eadc_base, chn); // Just 12 bits are effective. Convert to 16 bits. // conv_res_12: 0000 b11b10b9b8 b7b6b5b4 b3b2b1b0 // conv_res_16: b11b10b9b8 b7b6b5b4 b3b2b1b0 b11b10b9b8 uint16_t conv_res_16 = (conv_res_12 << 4) | (conv_res_12 >> 8); return conv_res_16; } float analogin_read(analogin_t *obj) { uint16_t value = analogin_read_u16(obj); return (float) value * (1.0f / (float) 0xFFFF); } const PinMap *analogin_pinmap() { return PinMap_ADC; } #endif