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adc_18xx_43xx.c
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1 /*
2  * @brief LPC18xx/43xx A/D conversion driver
3  *
4  * @note
5  * Copyright(C) NXP Semiconductors, 2012
6  * All rights reserved.
7  *
8  * @par
9  * Software that is described herein is for illustrative purposes only
10  * which provides customers with programming information regarding the
11  * LPC products. This software is supplied "AS IS" without any warranties of
12  * any kind, and NXP Semiconductors and its licensor disclaim any and
13  * all warranties, express or implied, including all implied warranties of
14  * merchantability, fitness for a particular purpose and non-infringement of
15  * intellectual property rights. NXP Semiconductors assumes no responsibility
16  * or liability for the use of the software, conveys no license or rights under any
17  * patent, copyright, mask work right, or any other intellectual property rights in
18  * or to any products. NXP Semiconductors reserves the right to make changes
19  * in the software without notification. NXP Semiconductors also makes no
20  * representation or warranty that such application will be suitable for the
21  * specified use without further testing or modification.
22  *
23  * @par
24  * Permission to use, copy, modify, and distribute this software and its
25  * documentation is hereby granted, under NXP Semiconductors' and its
26  * licensor's relevant copyrights in the software, without fee, provided that it
27  * is used in conjunction with NXP Semiconductors microcontrollers. This
28  * copyright, permission, and disclaimer notice must appear in all copies of
29  * this code.
30  */
31 
32 #include "adc_18xx_43xx.h"
33 
34 /*****************************************************************************
35  * Private types/enumerations/variables
36  ****************************************************************************/
37 
38 /*The channel to be operated on */
39 static uint8_t active_channel;
40 
41 /*****************************************************************************
42  * Public types/enumerations/variables
43  ****************************************************************************/
44 
45 /*****************************************************************************
46  * Private functions
47  ****************************************************************************/
48 
49 /* Returns the clock for the selected ADC */
51 {
52  CCU_CLK_T adcclk;
53 
54  if (pADC == LPC_ADC0) {
55  adcclk = CLK_APB3_ADC0;
56  }
57  else {
58  adcclk = CLK_APB3_ADC1;
59  }
60 
61  return adcclk;
62 }
63 
64 /*****************************************************************************
65  * Public functions
66  ****************************************************************************/
67 
68 /* Initialize the ADC peripheral and the ADC setup structure to default value */
70 {
71  CCU_CLK_T adcclk = Chip_ADC_GetClk(pADC);
72 
73  /* Enable ADC clocking */
74  Chip_Clock_EnableOpts(adcclk, true, true, 1);
75  ADCSetup->adcPerClock = Chip_Clock_GetRate(adcclk);
76 
77  ADCSetup->adcRate = 400000;
78  ADCSetup->bitsAccuracy = ADC_10BITS;
79  IP_ADC_Init(pADC, ADCSetup->adcRate, ADCSetup->adcPerClock, ADCSetup->bitsAccuracy);
80 }
81 
82 /* Select the mode starting the AD conversion */
84 {
85  if ((mode != ADC_START_NOW) && (mode != ADC_NO_START)) {
86  IP_ADC_EdgeStartConfig(pADC, (uint8_t) EdgeOption);
87  }
88  IP_ADC_SetStartMode(pADC, (uint8_t) mode);
89 }
90 
91 /* Set the ADC Sample rate */
93 {
94  ADCSetup->adcRate = rate;
95  IP_ADC_Init(pADC, ADCSetup->adcRate, ADCSetup->adcPerClock, ADCSetup->bitsAccuracy);
96 
97 }
98 
99 /* Set the ADC accuracy bits */
101 {
102  ADCSetup->bitsAccuracy = resolution;
103  IP_ADC_Init(pADC, ADCSetup->adcRate, ADCSetup->adcPerClock, ADCSetup->bitsAccuracy);
104 }
105 
106 /* Enable or disable the ADC channel on ADC peripheral */
108 {
109  IP_ADC_SetChannelNumber(pADC, channel, NewState);
110  active_channel = channel;
111 }
112 
113 /* Enable burst mode */
115 {
117  IP_ADC_SetBurstMode(pADC, NewState);
118 }
119 
120 /* Read the ADC value and convert it to 8bits value */
122 {
123  uint16_t temp;
124  Status rt;
125 
126  rt = IP_ADC_Get_Val(pADC, active_channel, &temp);
127  *data = (uint8_t) temp;
128 
129  return rt;
130 }
131 
132 /* Set a channel to be read A/D data */
133 void Chip_ADC_Active_Channel(uint8_t channel)
134 {
135  active_channel = channel;
136 }