Diff: vendor/NXP/LPC4088/hal/analogin_api.c

Revision:

13:0645d8841f51

Parent:

12:5fa2273de5db

Child:

14:096882eb0961

--- a/vendor/NXP/LPC4088/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_23, ADC0_0, 0x01},
-    {P0_24, ADC0_1, 0x01},
-    {P0_25, ADC0_2, 0x01},
-    {P0_26, ADC0_3, 0x01},
-    {P1_30, ADC0_4, 0x03},
-    {P1_31, ADC0_5, 0x03},
-    {P0_12, ADC0_6, 0x03},
-    {P0_13, ADC0_7, 0x03},
-    {NC   , NC    , 0   }
-};
-
-#define ADC_RANGE    ADC_12BIT_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");
-    }
-    
-    // ensure power is turned on
-    LPC_SC->PCONP |= (1 << 12);
-    
-    uint32_t PCLK = PeripheralClock;
-    
-    // calculate minimum clock divider
-    //  clkdiv = divider - 1
-    uint32_t MAX_ADC_CLK = 12400000;
-    uint32_t clkdiv = div_round_up(PCLK, MAX_ADC_CLK) - 1;
-    
-    // Set the generic software-controlled ADC settings
-    LPC_ADC->CR = (0 << 0)      // SEL: 0 = no channels selected
-                  | (clkdiv << 8) // CLKDIV:
-                  | (0 << 16)     // BURST: 0 = software control
-                  | (1 << 21)     // PDN: 1 = operational
-                  | (0 << 24)     // START: 0 = no start
-                  | (0 << 27);    // EDGE: not applicable
-    
-    // must enable analog mode (ADMODE = 0)
-    __IO uint32_t *reg = (__IO uint32_t*) (LPC_IOCON_BASE + 4 * pin);
-    *reg &= ~(1 << 7);
-    
-    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 >> 4) & ADC_RANGE; // 12 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 << 4) | ((value >> 8) & 0x000F); // 12 bit
-}
-
-float analogin_read(analogin_t *obj) {
-    uint32_t value = adc_read_u32(obj);
-    return (float)value * (1.0f / (float)ADC_RANGE);
-}