Paparazzi UAS  v5.15_devel-111-g8fb4629
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mpl3115.c
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2  *
3  * Copyright (C) 2011 Gautier Hattenberger
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22 
27 #include "peripherals/mpl3115.h"
28 #include "std.h"
29 
30 
31 void mpl3115_init(struct Mpl3115 *mpl, struct i2c_periph *i2c_p, uint8_t addr)
32 {
33 
34  /* set i2c_peripheral */
35  mpl->i2c_p = i2c_p;
36 
37  /* slave address */
38  mpl->trans.slave_addr = addr;
39 
40  mpl->trans.status = I2CTransDone;
42  mpl->initialized = false;
44 
45  /* by default disable raw mode and set pressure mode */
46  mpl->raw_mode = false;
47  mpl->alt_mode = false;
48 
49  mpl->pressure = 0;
50  mpl->temperature = 0;
51  mpl->altitude = 0.;
52 }
53 
54 // Configuration function called once before normal use
55 static void mpl3115_send_config(struct Mpl3115 *mpl)
56 {
57  switch (mpl->init_status) {
58  case MPL_CONF_PT_DATA:
60  mpl->trans.buf[1] = MPL3115_PT_DATA_CFG;
61  i2c_transmit(mpl->i2c_p, &mpl->trans, mpl->trans.slave_addr, 2);
62  mpl->init_status++;
63  break;
64  case MPL_CONF_CTRL1:
66  mpl->trans.buf[1] = ((MPL3115_OVERSAMPLING << 3) | (mpl->raw_mode << 6) |
67  (mpl->alt_mode << 7));
68  i2c_transmit(mpl->i2c_p, &mpl->trans, mpl->trans.slave_addr, 2);
69  mpl->init_status++;
70  break;
71  case MPL_CONF_DONE:
72  mpl->initialized = true;
73  mpl->trans.status = I2CTransDone;
74  break;
75  default:
76  break;
77  }
78 }
79 
80 // Configure
81 void mpl3115_configure(struct Mpl3115 *mpl)
82 {
83  if (mpl->init_status == MPL_CONF_UNINIT) {
84  mpl->init_status++;
85  if (mpl->trans.status == I2CTransSuccess || mpl->trans.status == I2CTransDone) {
87  }
88  }
89 }
90 
91 // Normal reading
92 void mpl3115_read(struct Mpl3115 *mpl)
93 {
94  // ask for a reading and then prepare next conversion
95  if (mpl->initialized && mpl->trans.status == I2CTransDone) {
96  mpl->trans.buf[0] = MPL3115_REG_STATUS;
97  i2c_transceive(mpl->i2c_p, &mpl->trans, mpl->trans.slave_addr, 1, 6);
98  if (mpl->req_trans.status == I2CTransDone) {
100  mpl->req_trans.buf[1] = ((MPL3115_OVERSAMPLING << 3) | (mpl->raw_mode << 6) |
101  (mpl->alt_mode << 7) | MPL3115_OST_BIT);
102  i2c_transmit(mpl->i2c_p, &mpl->req_trans, mpl->trans.slave_addr, 2);
103  }
104  }
105 }
106 
107 void mpl3115_event(struct Mpl3115 *mpl)
108 {
109  if (mpl->initialized) {
110  if (mpl->trans.status == I2CTransFailed) {
111  mpl->trans.status = I2CTransDone;
112  } else if (mpl->trans.status == I2CTransSuccess) {
113  // Successfull reading and new pressure data available
114  if (mpl->trans.buf[0] & (1 << 2)) {
115  if (mpl->raw_mode) {
116  // New data available
117  mpl->pressure = (((uint32_t)mpl->trans.buf[1] << 16) |
118  ((uint16_t)mpl->trans.buf[2] << 8) |
119  mpl->trans.buf[3]);
120  mpl->temperature = ((int16_t)mpl->trans.buf[4] << 8) | mpl->trans.buf[5];
121  } else { // not in raw mode
122  uint32_t tmp = (((uint32_t)mpl->trans.buf[1] << 16) |
123  ((uint16_t)mpl->trans.buf[2] << 8) |
124  mpl->trans.buf[3]);
125  if (mpl->alt_mode) {
126  mpl->altitude = (float)(tmp >> 4) / (1 << 4);
127  } else { // Pressure mode
128  mpl->pressure = (tmp >> 4);
129  }
130  tmp = ((int16_t)mpl->trans.buf[4] << 8) | mpl->trans.buf[5];
131  mpl->temperature = (tmp >> 4);
132  }
133  mpl->data_available = true;
134  }
135  mpl->trans.status = I2CTransDone;
136  }
137  } else if (!mpl->initialized && mpl->init_status != MPL_CONF_UNINIT) { // Configuring
138  if (mpl->trans.status == I2CTransSuccess || mpl->trans.status == I2CTransDone) {
139  mpl->trans.status = I2CTransDone;
140  mpl3115_send_config(mpl);
141  }
142  if (mpl->trans.status == I2CTransFailed) {
143  mpl->init_status--;
144  mpl->trans.status = I2CTransDone;
145  mpl3115_send_config(mpl); // Retry config (TODO max retry)
146  }
147  }
150  }
151 }
152 
153 void mpl3115_periodic(struct Mpl3115 *mpl)
154 {
155  if (mpl->initialized) {
156  mpl3115_read(mpl);
157  } else {
158  mpl3115_configure(mpl);
159  }
160 }
static void mpl3115_send_config(struct Mpl3115 *mpl)
Definition: mpl3115.c:55
unsigned short uint16_t
Definition: types.h:16
void mpl3115_read(struct Mpl3115 *mpl)
Definition: mpl3115.c:92
volatile bool data_available
data ready flag
Definition: mpl3115.h:76
volatile uint8_t buf[I2C_BUF_LEN]
Transaction buffer With I2C_BUF_LEN number of bytes.
Definition: i2c.h:122
transaction successfully finished by I2C driver
Definition: i2c.h:57
void mpl3115_init(struct Mpl3115 *mpl, struct i2c_periph *i2c_p, uint8_t addr)
Definition: mpl3115.c:31
#define MPL3115_PT_DATA_CFG
Definition: mpl3115.h:56
void mpl3115_event(struct Mpl3115 *mpl)
Definition: mpl3115.c:107
#define MPL3115_REG_STATUS
Definition: mpl3115.h:38
#define MPL3115_OVERSAMPLING
Definition: mpl3115.h:59
void mpl3115_periodic(struct Mpl3115 *mpl)
Definition: mpl3115.c:153
#define MPL3115_REG_PT_DATA_CFG
Definition: mpl3115.h:45
uint32_t pressure
pressure in 1/4 Pascal
Definition: mpl3115.h:80
transaction set to done by user level
Definition: i2c.h:59
bool raw_mode
set to TRUE to enable raw output
Definition: mpl3115.h:77
unsigned long uint32_t
Definition: types.h:18
struct i2c_transaction req_trans
I2C transaction for conversion request.
Definition: mpl3115.h:73
signed short int16_t
Definition: types.h:17
void mpl3115_configure(struct Mpl3115 *mpl)
Definition: mpl3115.c:81
transaction failed
Definition: i2c.h:58
Driver for the baro MPL3115A2 from Freescale (i2c)
bool i2c_transceive(struct i2c_periph *p, struct i2c_transaction *t, uint8_t s_addr, uint8_t len_w, uint16_t len_r)
Submit a write/read transaction.
Definition: i2c.c:328
enum I2CTransactionStatus status
Transaction status.
Definition: i2c.h:126
bool i2c_transmit(struct i2c_periph *p, struct i2c_transaction *t, uint8_t s_addr, uint8_t len)
Submit a write only transaction.
Definition: i2c.c:308
bool alt_mode
set to TRUE to enable altitude output (otherwise pressure)
Definition: mpl3115.h:78
int16_t temperature
temperature in 1/16 degrees Celcius
Definition: mpl3115.h:79
bool initialized
config done flag
Definition: mpl3115.h:75
struct i2c_transaction trans
I2C transaction for reading and configuring.
Definition: mpl3115.h:72
uint8_t slave_addr
Slave address.
Definition: i2c.h:104
I2C peripheral structure.
Definition: i2c.h:138
enum Mpl3115Status init_status
Definition: mpl3115.h:74
float altitude
altitude in meters
Definition: mpl3115.h:81
unsigned char uint8_t
Definition: types.h:14
#define MPL3115_REG_CTRL_REG1
Definition: mpl3115.h:46
#define MPL3115_OST_BIT
Definition: mpl3115.h:52
struct i2c_periph * i2c_p
Definition: mpl3115.h:71