1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
|
/*
* Copyright (c) 2006-2021, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2017-09-18 Haley the first version
*/
#include <rtthread.h>
#include <rtdevice.h>
#include "am_mcu_apollo.h"
#ifdef RT_USING_ADC
/* messagequeue define */
struct rt_messagequeue adcbat_mq;
#define BATTERY_GPIO 35 /* Battery */
#define BATTERY_ADC_PIN AM_HAL_PIN_35_ADCSE7
#define BATTERY_ADC_CHANNEL AM_HAL_ADC_SLOT_CHSEL_SE7 /* BATTERY ADC采集通道 */
#define BATTERY_ADC_CHANNELNUM 7 /* BATTERY ADC采集通道号 */
#define ADC_CTIMER_NUM 3 /* ADC使用定时器 */
#define ADC_CTIMER_COUNT (2048/512 - 1)
#define ADC_CHANNEL_NUM 1 /* ADC采集通道个数 */
#define ADC_SAMPLE_NUM 8 /* ADC采样个数 */
rt_uint8_t bat_adc_cnt = 0;
static rt_uint8_t am_adcbat_buffer_pool[256];
static rt_int16_t am_adcbat_buffertemp[32];
rt_uint8_t am_adc_data_get(rt_uint8_t channel, rt_int16_t *buff, rt_uint16_t size)
{
rt_uint8_t adc_bufftemp[32];
if (channel == BATTERY_ADC_CHANNELNUM)
{
/* wait adc message forever */
rt_mq_recv(&adcbat_mq, adc_bufftemp, 32, RT_WAITING_FOREVER);
}
/* copy the data */
rt_memcpy(buff, adc_bufftemp, size*sizeof(rt_int16_t));
return 0;
}
void am_adc_start(rt_uint8_t channel)
{
/* messagequeue init */
rt_mq_init(&adcbat_mq, "mq_adcbat",
&am_adcbat_buffer_pool[0],
32 - sizeof(void*),
sizeof(am_adcbat_buffer_pool),
RT_IPC_FLAG_FIFO);
/* Start the ctimer */
am_hal_ctimer_start(ADC_CTIMER_NUM, AM_HAL_CTIMER_TIMERA);
/* Trigger the ADC once */
am_hal_adc_trigger();
}
void am_adc_stop(rt_uint8_t channel)
{
/* Stop the ctimer */
am_hal_ctimer_stop(ADC_CTIMER_NUM, AM_HAL_CTIMER_TIMERA);
/* messagequeue delete */
rt_mq_delete(&adceeg_mq);
/* messagequeue delete */
rt_mq_delete(&adcbat_mq);
}
/**
* @brief Interrupt handler for the ADC
*
* This function is Interrupt handler for the ADC
*
* @return None.
*/
void am_adc_isr(void)
{
uint32_t ui32Status, ui32FifoData;
/* enter interrupt */
rt_interrupt_enter();
/* Read the interrupt status */
ui32Status = am_hal_adc_int_status_get(true);
/* Clear the ADC interrupt */
am_hal_adc_int_clear(ui32Status);
/* If we got a FIFO 75% full (which should be our only ADC interrupt), go ahead and read the data */
if (ui32Status & AM_HAL_ADC_INT_FIFOOVR1)
{
do
{
/* Read the value from the FIFO into the circular buffer */
ui32FifoData = am_hal_adc_fifo_pop();
if (AM_HAL_ADC_FIFO_SLOT(ui32FifoData) == BATTERY_ADC_CHANNELNUM)
{
am_adcbat_buffertemp[bat_adc_cnt++] = AM_HAL_ADC_FIFO_SAMPLE(ui32FifoData);
}
if ((bat_adc_cnt > ADC_SAMPLE_NUM + 2 - 1))
{
bat_adc_cnt = 0;
/* send the message */
rt_mq_send(&adcbat_mq, am_adcbat_buffertemp, ADC_SAMPLE_NUM*sizeof(rt_int16_t));
}
} while (AM_HAL_ADC_FIFO_COUNT(ui32FifoData) > 0);
}
/* leave interrupt */
rt_interrupt_leave();
}
static void timerA3_for_adc_init(void)
{
/* Start a timer to trigger the ADC periodically (1 second) */
am_hal_ctimer_config_single(ADC_CTIMER_NUM, AM_HAL_CTIMER_TIMERA,
AM_HAL_CTIMER_XT_2_048KHZ |
AM_HAL_CTIMER_FN_REPEAT |
AM_HAL_CTIMER_INT_ENABLE |
AM_HAL_CTIMER_PIN_ENABLE);
am_hal_ctimer_int_enable(AM_HAL_CTIMER_INT_TIMERA3);
/* Set 512 sample rate */
am_hal_ctimer_period_set(ADC_CTIMER_NUM, AM_HAL_CTIMER_TIMERA, ADC_CTIMER_COUNT, 1);
/* Enable the timer A3 to trigger the ADC directly */
am_hal_ctimer_adc_trigger_enable();
/* Start the timer */
//am_hal_ctimer_start(ADC_CTIMER_NUM, AM_HAL_CTIMER_TIMERA);
}
/**
* @brief Initialize the ADC
*
* This function initialize the ADC
*
* @return None.
*/
int rt_hw_adc_init(void)
{
am_hal_adc_config_t sADCConfig;
/* timer for adc init*/
timerA3_for_adc_init();
/* Set a pin to act as our ADC input */
am_hal_gpio_pin_config(BATTERY_GPIO, BATTERY_ADC_PIN);
/* Enable interrupts */
am_hal_interrupt_enable(AM_HAL_INTERRUPT_ADC);
/* Enable the ADC power domain */
am_hal_pwrctrl_periph_enable(AM_HAL_PWRCTRL_ADC);
/* Set up the ADC configuration parameters. These settings are reasonable
for accurate measurements at a low sample rate */
sADCConfig.ui32Clock = AM_HAL_ADC_CLOCK_HFRC;
sADCConfig.ui32TriggerConfig = AM_HAL_ADC_TRIGGER_SOFT;
sADCConfig.ui32Reference = AM_HAL_ADC_REF_INT_2P0;
sADCConfig.ui32ClockMode = AM_HAL_ADC_CK_LOW_POWER;
sADCConfig.ui32PowerMode = AM_HAL_ADC_LPMODE_0;
sADCConfig.ui32Repeat = AM_HAL_ADC_REPEAT;
am_hal_adc_config(&sADCConfig);
/* For this example, the samples will be coming in slowly. This means we
can afford to wake up for every conversion */
am_hal_adc_int_enable(AM_HAL_ADC_INT_FIFOOVR1);
/* Set up an ADC slot */
am_hal_adc_slot_config(BATTERY_ADC_CHANNELNUM, AM_HAL_ADC_SLOT_AVG_1 |
AM_HAL_ADC_SLOT_14BIT |
BATTERY_ADC_CHANNEL |
AM_HAL_ADC_SLOT_ENABLE);
/* Enable the ADC */
am_hal_adc_enable();
/* Trigger the ADC once */
//am_hal_adc_trigger();
//rt_kprintf("adc_init!\n");
return 0;
}
#ifdef RT_USING_COMPONENTS_INIT
INIT_BOARD_EXPORT(rt_hw_adc_init);
#endif
#endif
/*@}*/
|
