mbed library sources: Modified to operate FRDM-KL25Z at 48MHz from internal 32kHz oscillator (nothing else changed).
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The only file that changed is: mbed-src-FLL48/targets/cmsis/TARGET_Freescale/TARGET_KL25Z/system_MKL25Z4.h
Diff: targets/hal/TARGET_Freescale/TARGET_KL05Z/analogin_api.c
- Revision:
- 20:4263a77256ae
diff -r 398f4c622e1b -r 4263a77256ae targets/hal/TARGET_Freescale/TARGET_KL05Z/analogin_api.c --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/targets/hal/TARGET_Freescale/TARGET_KL05Z/analogin_api.c Tue Sep 10 15:14:19 2013 +0300 @@ -0,0 +1,89 @@ +/* mbed Microcontroller Library + * Copyright (c) 2006-2013 ARM Limited + * + * 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" + +#include "cmsis.h" +#include "pinmap.h" +#include "error.h" + +static const PinMap PinMap_ADC[] = { + /* A0-A5 pins */ + {PTA0, ADC0_SE12, 0}, + {PTA8, ADC0_SE3, 0}, + {PTA9, ADC0_SE2, 0}, + {PTB8, ADC0_SE11, 0}, + {PTB9, ADC0_SE10, 0}, + {PTB13, ADC0_SE13, 0}, + /* Rest of pins ADC Mux */ + {PTB2, ADC0_SE4, 0}, + {PTB1, ADC0_SE5, 0}, + {PTB5, ADC0_SE1, 0}, + {PTA12, ADC0_SE0, 0}, + {PTB10, ADC0_SE9, 0}, + {PTB11, ADC0_SE8, 0}, + {PTB7, ADC0_SE7, 0}, + {PTB0, ADC0_SE6, 0}, + {NC, NC, 0} +}; + +void analogin_init(analogin_t *obj, PinName pin) { + obj->adc = (ADCName)pinmap_peripheral(pin, PinMap_ADC); + if (obj->adc == (uint32_t)NC) { + error("ADC pin mapping failed"); + } + + SIM->SCGC6 |= SIM_SCGC6_ADC0_MASK; + + uint32_t port = (uint32_t)pin >> PORT_SHIFT; + SIM->SCGC5 |= 1 << (SIM_SCGC5_PORTA_SHIFT + port); + + ADC0->SC1[1] = ADC_SC1_ADCH(obj->adc); + + ADC0->CFG1 = ADC_CFG1_ADLPC_MASK // Low-Power Configuration + | ADC_CFG1_ADIV(3) // Clock Divide Select: (Input Clock)/8 + | ADC_CFG1_ADLSMP_MASK // Long Sample Time + | ADC_CFG1_MODE(1) // (12)bits Resolution + | ADC_CFG1_ADICLK(1); // Input Clock: (Bus Clock)/2 + + ADC0->CFG2 = ADC_CFG2_MUXSEL_MASK // ADxxb channels are selected + | ADC_CFG2_ADACKEN_MASK // Asynchronous Clock Output Enable + | ADC_CFG2_ADHSC_MASK // High-Speed Configuration + | ADC_CFG2_ADLSTS(0); // Long Sample Time Select + + ADC0->SC2 = ADC_SC2_REFSEL(0); // Default Voltage Reference + + ADC0->SC3 = ADC_SC3_AVGE_MASK // Hardware Average Enable + | ADC_SC3_AVGS(0); // 4 Samples Averaged + + pinmap_pinout(pin, PinMap_ADC); +} + +uint16_t analogin_read_u16(analogin_t *obj) { + // start conversion + ADC0->SC1[0] = ADC_SC1_ADCH(obj->adc); + + // Wait Conversion Complete + while ((ADC0->SC1[0] & ADC_SC1_COCO_MASK) != ADC_SC1_COCO_MASK); + + // Return value (12bit) + return (uint16_t)ADC0->R[0]; +} + +float analogin_read(analogin_t *obj) { + uint16_t value = analogin_read_u16(obj); + return (float)value * (1.0f / (float)0xFFFF); +} +