mbed library sources. Supersedes mbed-src.
Dependents: Hobbyking_Cheetah_Compact Hobbyking_Cheetah_Compact_DRV8323_14bit Hobbyking_Cheetah_Compact_DRV8323_V51_201907 HKC_MiniCheetah ... more
Fork of mbed-dev by
targets/TARGET_Maxim/TARGET_MAX32620/analogin_api.c
- Committer:
- benkatz
- Date:
- 2018-07-30
- Revision:
- 181:36facd806e4a
- Parent:
- 149:156823d33999
File content as of revision 181:36facd806e4a:
/******************************************************************************* * Copyright (C) 2016 Maxim Integrated Products, Inc., All Rights Reserved. * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the "Software"), * to deal in the Software without restriction, including without limitation * the rights to use, copy, modify, merge, publish, distribute, sublicense, * and/or sell copies of the Software, and to permit persons to whom the * Software is furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included * in all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. * IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES * OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR * OTHER DEALINGS IN THE SOFTWARE. * * Except as contained in this notice, the name of Maxim Integrated * Products, Inc. shall not be used except as stated in the Maxim Integrated * Products, Inc. Branding Policy. * * The mere transfer of this software does not imply any licenses * of trade secrets, proprietary technology, copyrights, patents, * trademarks, maskwork rights, or any other form of intellectual * property whatsoever. Maxim Integrated Products, Inc. retains all * ownership rights. ******************************************************************************* */ #include "mbed_assert.h" #include "analogin_api.h" #include "clkman_regs.h" #include "pwrman_regs.h" #include "trim_regs.h" #include "PeripheralPins.h" #define PGA_TRK_CNT 0x1F #define ADC_ACT_CNT 0x1 #define ADC_PGA_CNT 0x1 #define ADC_ACQ_CNT 0x1 #define ADC_SLP_CNT 0x1 #define ADC_FULL_SCALE 0x3FF #define ADC_EXTERNAL_LAST_INPUT 3 // Only allow initialization once static int initialized = 0; //****************************************************************************** void analogin_init(analogin_t *obj, PinName pin) { // Make sure pin is an analog pin we can use for ADC MBED_ASSERT((ADCName)pinmap_peripheral(pin, PinMap_ADC) != (ADCName)NC); // Set the object pointer obj->adc = MXC_ADC; obj->adc_pin = pin; if (initialized == 0) { // Enable AFE power MXC_PWRMAN->pwr_rst_ctrl |= MXC_F_PWRMAN_PWR_RST_CTRL_AFE_POWERED; // Enable the clock MXC_CLKMAN->clk_ctrl |= MXC_F_CLKMAN_CLK_CTRL_ADC_CLOCK_ENABLE; // Enable clock gate MXC_CLKMAN->clk_gate_ctrl2 |= MXC_F_CLKMAN_CLK_GATE_CTRL2_ADC_CLK_GATER; // Enable interface clock obj->adc->ctrl |= MXC_F_ADC_CTRL_ADC_CLK_EN; if ((MXC_TRIM->reg11_adc_trim0 == 0xFFFFFFFF) && (MXC_TRIM->reg12_adc_trim1 == 0xFFFFFFFF)) { // Set default trim for untrimmed parts. MXC_TRIM->reg11_adc_trim0 = 0x02000200; MXC_TRIM->reg12_adc_trim1 = 0x02000200; } // Clear ADC ready interrupt (wite 1 to clr) obj->adc->intr = (obj->adc->intr & 0xFFFF) | MXC_F_ADC_INTR_ADC_REF_READY_IF; // Using internal reference of 1.20V // Enable ADC power bypass the buffer obj->adc->ctrl |= (MXC_F_ADC_CTRL_ADC_PU | MXC_F_ADC_CTRL_ADC_REFBUF_PU | MXC_F_ADC_CTRL_ADC_CHGPUMP_PU | MXC_F_ADC_CTRL_BUF_BYPASS); // Wait for ADC ready while (!(obj->adc->intr & MXC_F_ADC_INTR_ADC_REF_READY_IF)); initialized = 1; } } //****************************************************************************** float analogin_read(analogin_t *obj) { // Convert integer to float return (((float)analogin_read_u16(obj)/(float)ADC_FULL_SCALE)); } //****************************************************************************** uint16_t analogin_read_u16(analogin_t *obj) { // Set the pin to take readings from uint32_t adc_input = PINNAME_TO_PIN(obj->adc_pin); // Select the channel obj->adc->ctrl &= ~MXC_F_ADC_CTRL_ADC_CHSEL; obj->adc->ctrl |= (adc_input << MXC_F_ADC_CTRL_ADC_CHSEL_POS) & MXC_F_ADC_CTRL_ADC_CHSEL; // We want unity gain, to get full 0-Vref range // So, both ref and adc input scale should be enabled obj->adc->ctrl |= MXC_F_ADC_CTRL_ADC_SCALE | MXC_F_ADC_CTRL_ADC_REFSCL; // Not using internal buffer, disable anyway obj->adc->ctrl &= ~MXC_F_ADC_CTRL_BUF_PU; obj->adc->ctrl |= MXC_F_ADC_CTRL_BUF_BYPASS; // Normal LSB justified data alignment // Not using limits // Clear ADC done flag (wite 1 to clr) obj->adc->intr = (obj->adc->intr & 0xFFFF) | MXC_F_ADC_INTR_ADC_DONE_IF; // Start the conversion obj->adc->ctrl |= MXC_F_ADC_CTRL_CPU_ADC_START; // Wait for ADC done while (!(obj->adc->intr & MXC_F_ADC_INTR_ADC_DONE_IF)); // Get sample from the fifo uint16_t sample = obj->adc->data; // Check for overflow, hardware will report overflow as 0 if (obj->adc->status & MXC_F_ADC_STATUS_ADC_OVERFLOW) { sample = (uint16_t)ADC_FULL_SCALE; } return sample; }