added prescaler for 16 bit pwm in LPC1347 target
Fork of mbed-dev by
targets/hal/TARGET_Maxim/TARGET_MAX32610/analogin_api.c
- Committer:
- bogdanm
- Date:
- 2015-10-01
- Revision:
- 0:9b334a45a8ff
- Child:
- 144:ef7eb2e8f9f7
File content as of revision 0:9b334a45a8ff:
/******************************************************************************* * Copyright (C) 2015 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 "afe_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 //****************************************************************************** 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->adccfg = MXC_ADCCFG; obj->adc_fifo = MXC_ADC_FIFO; obj->adc_pin = pin; // Set the ADC clock to the system clock frequency MXC_SET_FIELD(&MXC_CLKMAN->clk_ctrl, MXC_F_CLKMAN_CLK_CTRL_ADC_SOURCE_SELECT, (MXC_F_CLKMAN_CLK_CTRL_ADC_GATE_N | (MXC_E_CLKMAN_ADC_SOURCE_SELECT_SYSTEM << MXC_F_CLKMAN_CLK_CTRL_ADC_SOURCE_SELECT_POS))); // Enable AFE power MXC_PWRMAN->pwr_rst_ctrl |= MXC_F_PWRMAN_PWR_RST_CTRL_AFE_POWERED; // Setup and hold window MXC_SET_FIELD(&obj->adc->tg_ctrl0, MXC_F_ADC_TG_CTRL0_PGA_TRK_CNT, PGA_TRK_CNT); // Setup sampling count and timing MXC_SET_FIELD(&obj->adc->tg_ctrl1, (MXC_F_ADC_TG_CTRL1_PGA_ACQ_CNT | MXC_F_ADC_TG_CTRL1_ADC_ACQ_CNT | MXC_F_ADC_TG_CTRL1_ADC_SLP_CNT), ((ADC_PGA_CNT << MXC_F_ADC_TG_CTRL1_PGA_ACQ_CNT_POS) | (ADC_ACQ_CNT << MXC_F_ADC_TG_CTRL1_ADC_ACQ_CNT_POS) | (ADC_SLP_CNT << MXC_F_ADC_TG_CTRL1_ADC_SLP_CNT_POS) | (MXC_F_ADC_TG_CTRL1_ADC_BRST_CNT))); } //****************************************************************************** float analogin_read(analogin_t *obj) { // Convert integer to float return (((float)analogin_read_u16(obj)/(float)0xFFFF)); } //****************************************************************************** uint16_t analogin_read_u16(analogin_t *obj) { // Set the pin to take readings from unsigned mux_pos; unsigned diff = 0; if(obj->adc_pin >> PORT_SHIFT == 0xB) { mux_pos = (obj->adc_pin & 0xF) + 8; } else { mux_pos = (obj->adc_pin & 0xF); } if(obj->adc_pin >> PORT_SHIFT == 0xC) { diff = 1; mux_pos = (obj->adc_pin & 0xF) + 8; } // Reset the ADC obj->adc->ctrl0 |= MXC_F_ADC_CTRL0_CPU_ADC_RST; // Enable the ADC obj->adc->ctrl0 |= MXC_F_ADC_CTRL0_CPU_ADC_EN; // Setup the ADC clock MXC_SET_FIELD(&obj->adc->ctrl0, (MXC_F_ADC_CTRL0_ADC_MODE | MXC_F_ADC_CTRL0_AVG_MODE | MXC_F_ADC_CTRL0_ADC_CLK_MODE | MXC_F_ADC_CTRL0_ADC_BI_POL), ((MXC_E_ADC_MODE_SMPLCNT_FULL_RATE << MXC_F_ADC_CTRL0_ADC_MODE_POS) | (MXC_E_ADC_AVG_MODE_FILTER_OUTPUT << MXC_F_ADC_CTRL0_AVG_MODE_POS) | (0x2 << MXC_F_ADC_CTRL0_ADC_CLK_MODE_POS) | MXC_F_ADC_CTRL0_ADC_CLK_EN)); // Setup the input multiplexor MXC_SET_FIELD(&obj->adc->pga_ctrl, (MXC_F_ADC_PGA_CTRL_MUX_CH_SEL | MXC_F_ADC_PGA_CTRL_MUX_DIFF | MXC_F_ADC_PGA_CTRL_PGA_GAIN), ((mux_pos << MXC_F_ADC_PGA_CTRL_MUX_CH_SEL_POS) | (diff << MXC_F_ADC_PGA_CTRL_MUX_DIFF_POS))); // Setup voltage reference MXC_SET_FIELD(&MXC_AFE->ctrl1, MXC_F_AFE_CTRL1_REF_ADC_VOLT_SEL, (MXC_F_AFE_CTRL1_REF_ADC_POWERUP | MXC_F_AFE_CTRL1_REF_BLK_POWERUP | (MXC_E_AFE_REF_VOLT_SEL_1500 << MXC_F_AFE_CTRL1_REF_ADC_VOLT_SEL_POS))); // Clear the done bit obj->adc->intr = MXC_F_ADC_INTR_DONE_IF; // Take one sample obj->adc->tg_ctrl0 |= (1 << MXC_F_ADC_TG_CTRL0_ADC_SMPL_CNT_POS); // Set the start bit to take the sample obj->adc->ctrl0 |= MXC_F_ADC_CTRL0_CPU_ADC_START; // Wait for the conversion to complete while(!(obj->adc->intr & MXC_F_ADC_INTR_DONE_IF)) {} // Get sample from the fifo uint16_t sample = (uint16_t)(obj->adc->out & 0xFFFF); // Disable ADC obj->adc->ctrl0 &= ~MXC_F_ADC_CTRL0_CPU_ADC_EN; return (sample - 1); }