added prescaler for 16 bit pwm in LPC1347 target
Fork of mbed-dev by
Diff: targets/hal/TARGET_Maxim/TARGET_MAX32610/analogin_api.c
- Revision:
- 144:ef7eb2e8f9f7
- Parent:
- 0:9b334a45a8ff
diff -r 423e1876dc07 -r ef7eb2e8f9f7 targets/hal/TARGET_Maxim/TARGET_MAX32610/analogin_api.c --- a/targets/hal/TARGET_Maxim/TARGET_MAX32610/analogin_api.c Tue Aug 02 14:07:36 2016 +0000 +++ b/targets/hal/TARGET_Maxim/TARGET_MAX32610/analogin_api.c Fri Sep 02 15:07:44 2016 +0100 @@ -1,147 +1,147 @@ -/******************************************************************************* - * 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); -} +/******************************************************************************* + * 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); +}