Diff: vendor/NXP/LPC11U24/hal/analogin_api.c

Revision:

13:0645d8841f51

Parent:

12:5fa2273de5db

Child:

14:096882eb0961

--- a/vendor/NXP/LPC11U24/hal/analogin_api.c	Wed Jul 24 11:11:21 2013 +0100
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,126 +0,0 @@
-/* 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"
-
-#define ANALOGIN_MEDIAN_FILTER      1
-
-#define ADC_10BIT_RANGE             0x3FF
-#define ADC_12BIT_RANGE             0xFFF
-
-static inline int div_round_up(int x, int y) {
-  return (x + (y - 1)) / y;
-}
-
-static const PinMap PinMap_ADC[] = {
-    {P0_11, ADC0_0, 0x02},
-    {P0_12, ADC0_1, 0x02},
-    {P0_13, ADC0_2, 0x02},
-    {P0_14, ADC0_3, 0x02},
-    {P0_15, ADC0_4, 0x02},
-    {P0_16, ADC0_5, 0x01},
-    {P0_22, ADC0_6, 0x01},
-    {P0_23, ADC0_7, 0x01},
-    {NC   , NC    , 0   }
-};
-
-#define LPC_IOCON0_BASE (LPC_IOCON_BASE)
-#define LPC_IOCON1_BASE (LPC_IOCON_BASE + 0x60)
-
-#define ADC_RANGE    ADC_10BIT_RANGE
-
-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");
-    }
-    
-    // Power up ADC
-    LPC_SYSCON->PDRUNCFG &= ~ (1 << 4);
-    LPC_SYSCON->SYSAHBCLKCTRL |= ((uint32_t)1 << 13);
-
-    uint32_t pin_number = (uint32_t)pin;
-    __IO uint32_t *reg = (pin_number < 32) ? (__IO uint32_t*)(LPC_IOCON0_BASE + 4 * pin_number) : (__IO uint32_t*)(LPC_IOCON1_BASE + 4 * (pin_number - 32));
-
-    // set pin to ADC mode
-    *reg &= ~(1 << 7); // set ADMODE = 0 (analog mode)
-
-    uint32_t PCLK = SystemCoreClock;
-    uint32_t MAX_ADC_CLK = 4500000;
-    uint32_t clkdiv = div_round_up(PCLK, MAX_ADC_CLK) - 1;
-
-    LPC_ADC->CR = (0 << 0)      // no channels selected
-                | (clkdiv << 8) // max of 4.5MHz
-                | (0 << 16)     // BURST = 0, software controlled
-                | ( 0 << 17 );  // CLKS = 0, not applicable
-    
-    pinmap_pinout(pin, PinMap_ADC);
-}
-
-static inline uint32_t adc_read(analogin_t *obj) {
-    // Select the appropriate channel and start conversion
-    LPC_ADC->CR &= ~0xFF;
-    LPC_ADC->CR |= 1 << (int)obj->adc;
-    LPC_ADC->CR |= 1 << 24;
-    
-    // Repeatedly get the sample data until DONE bit
-    unsigned int data;
-    do {
-        data = LPC_ADC->GDR;
-    } while ((data & ((unsigned int)1 << 31)) == 0);
-    
-    // Stop conversion
-    LPC_ADC->CR &= ~(1 << 24);
-    
-    return (data >> 6) & ADC_RANGE; // 10 bit
-}
-
-static inline void order(uint32_t *a, uint32_t *b) {
-    if (*a > *b) {
-        uint32_t t = *a;
-        *a = *b;
-        *b = t;
-    }
-}
-
-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 << 6) | ((value >> 4) & 0x003F); // 10 bit
-}
-
-float analogin_read(analogin_t *obj) {
-    uint32_t value = adc_read_u32(obj);
-    return (float)value * (1.0f / (float)ADC_RANGE);
-}