1 /*!
2 * \file pam7q.c
3 *
4 * \brief PAM7Q GPS receiver driver implementation
5 *
6 * \copyright Revised BSD License, see section \ref LICENSE.
7 *
8 * \code
9 * ______ _
10 * / _____) _ | |
11 * ( (____ _____ ____ _| |_ _____ ____| |__
12 * \____ \| ___ | (_ _) ___ |/ ___) _ \
13 * _____) ) ____| | | || |_| ____( (___| | | |
14 * (______/|_____)_|_|_| \__)_____)\____)_| |_|
15 * (C)2013-2017 Semtech
16 *
17 * \endcode
18 *
19 * \author Miguel Luis ( Semtech )
20 *
21 * \author Gregory Cristian ( Semtech )
22 */
23 #include "utilities.h"
24 #include "i2c.h"
25 #include "pam7q.h"
26
27 extern I2c_t I2c;
28
29 static uint8_t I2cDeviceAddr = 0;
30
PAM7QInit(void)31 void PAM7QInit( void )
32 {
33 PAM7QSetDeviceAddr( PAM7Q_I2C_ADDRESS );
34 }
35
PAM7QGetGpsData(uint8_t * nmeaString,uint8_t * nmeaStringSize,uint16_t nmeaMaxStringSize)36 bool PAM7QGetGpsData( uint8_t *nmeaString, uint8_t *nmeaStringSize, uint16_t nmeaMaxStringSize )
37 {
38 uint8_t status;
39 uint16_t pendingBytes;
40 bool result = false;
41
42 *nmeaStringSize = 0;
43
44 status = PAM7QReadBuffer( MESSAGE_SIZE_1, nmeaString, 2 );
45
46 if( status == LMN_STATUS_OK )
47 {
48 // build a 16bit number
49 pendingBytes = ( uint16_t )( ( nmeaString[0] << 8 ) | nmeaString[1] );
50
51 // check for invalid length
52 if( pendingBytes == 0xFFFF )
53 {
54 pendingBytes = 0;
55 }
56 // just to buffer size
57 if( pendingBytes > ( nmeaMaxStringSize - 1 ) )
58 {
59 pendingBytes = nmeaMaxStringSize - 1;
60 }
61
62 // read pending data from GPS module
63 status = PAM7QReadBuffer( PAYLOAD, nmeaString, pendingBytes );
64
65 // make sure the string is terminated
66 if( status == LMN_STATUS_OK )
67 {
68 nmeaString[pendingBytes] = 0x00;
69
70 // copy length indication to argument
71 *nmeaStringSize = pendingBytes;
72
73 // return success only if there is data to process
74 if( pendingBytes > 0 )
75 {
76 result = true;
77 }
78 }
79 }
80 return result;
81 }
82
PAM7QGetDeviceAddr(void)83 uint8_t PAM7QGetDeviceAddr( void )
84 {
85 return I2cDeviceAddr;
86 }
87
PAM7QSetDeviceAddr(uint8_t addr)88 void PAM7QSetDeviceAddr( uint8_t addr )
89 {
90 I2cDeviceAddr = addr;
91 }
92
PAM7QWrite(uint8_t addr,uint8_t data)93 uint8_t PAM7QWrite( uint8_t addr, uint8_t data )
94 {
95 return PAM7QWriteBuffer( addr, &data, 1 );
96 }
97
PAM7QWriteBuffer(uint8_t addr,uint8_t * data,uint8_t size)98 uint8_t PAM7QWriteBuffer( uint8_t addr, uint8_t *data, uint8_t size )
99 {
100 return I2cWriteMemBuffer( &I2c, I2cDeviceAddr << 1, addr, data, size );
101 }
102
PAM7QRead(uint8_t addr,uint8_t * data)103 uint8_t PAM7QRead( uint8_t addr, uint8_t *data )
104 {
105 return PAM7QReadBuffer( addr, data, 1 );
106 }
107
PAM7QReadBuffer(uint8_t addr,uint8_t * data,uint8_t size)108 uint8_t PAM7QReadBuffer( uint8_t addr, uint8_t *data, uint8_t size )
109 {
110 return I2cReadMemBuffer( &I2c, I2cDeviceAddr << 1, addr, data, size );
111 }
112
