Mouse code for the MacroRat
Diff: mbed-dev/targets/TARGET_RENESAS/TARGET_RZ_A1H/analogin_api.c
- Revision:
- 18:6a4db94011d3
diff -r f713758f6238 -r 6a4db94011d3 mbed-dev/targets/TARGET_RENESAS/TARGET_RZ_A1H/analogin_api.c --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed-dev/targets/TARGET_RENESAS/TARGET_RZ_A1H/analogin_api.c Sun May 14 23:18:57 2017 +0000 @@ -0,0 +1,120 @@ +/* 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 "mbed_assert.h" +#include "analogin_api.h" + +#include "cmsis.h" +#include "pinmap.h" + +#include "adc_iodefine.h" +#include "cpg_iodefine.h" + +#define ANALOGIN_MEDIAN_FILTER 0 + +static const PinMap PinMap_ADC[] = { + {P1_8, AN0, 1}, + {P1_9, AN1, 1}, + {P1_10, AN2, 1}, + {P1_11, AN3, 1}, + {P1_12, AN4, 1}, + {P1_13, AN5, 1}, + {P1_14, AN6, 1}, + {P1_15, AN7, 1}, + {NC, NC, 0} +}; + +static volatile uint16_t *ADCDR[] = { + &ADCADDRA, + &ADCADDRB, + &ADCADDRC, + &ADCADDRD, + &ADCADDRE, + &ADCADDRF, + &ADCADDRG, + &ADCADDRH, +}; + +void analogin_init(analogin_t *obj, PinName pin) { + obj->adc = (ADCName)pinmap_peripheral(pin, PinMap_ADC); + MBED_ASSERT(obj->adc != (ADCName)NC); + + CPGSTBCR3 &= ~(1 << 1); + CPGSTBCR6 &= ~(1 << 7); + + // 15: ADF 14: ADIE 13: ADST, [12:9] TRGS..0 + // [8:6] CKS 010 :: 340tclk + // [5:3] MDS 000 :: single mode + // [2:0] CH 000 :: AN0 + ADCADCSR = 0x0080; + + pinmap_pinout(pin, PinMap_ADC); +} + +static inline uint32_t adc_read(analogin_t *obj) { + volatile uint16_t data; + + // Select the appropriate channel and start conversion + ADCADCSR &= 0xfff8; + ADCADCSR |= (1 << 13 | (obj->adc & 0x7)); + + // Wait end of conversion + do { + data = ADCADCSR; + } while (((data & (1 << 15)) == 0) || ((data & (1 << 13)) != 0)); + + // clear flag + ADCADCSR &= ~(1 << 15); + + return ((*(ADCDR[obj->adc])) >> 4) & 0x0FFF; // 12 bits range +} + +#if ANALOGIN_MEDIAN_FILTER +static inline void order(uint32_t *a, uint32_t *b) { + if (*a > *b) { + uint32_t t = *a; + *a = *b; + *b = t; + } +} +#endif + +static inline uint32_t adc_read_u32(analogin_t *obj) { + uint32_t value; +#if ANALOGIN_MEDIAN_FILTER + uint32_t v1 = adc_read(obj); + uint32_t v2 = adc_read(obj); + uint32_t v3 = adc_read(obj); + order(&v1, &v2); + order(&v2, &v3); + order(&v1, &v2); + value = v2; +#else + value = adc_read(obj); +#endif + return value; +} + +uint16_t analogin_read_u16(analogin_t *obj) { + uint32_t value = adc_read_u32(obj); + + return (value << 4) | ((value >> 8) & 0x000F); // 12-bit to 16-bit conversion +} + +float analogin_read(analogin_t *obj) { + uint32_t value = adc_read_u32(obj); + + return (float)value * (1.0f / (float)0x0FFF); // 12 bits range +}