1 /*!
2 * \file gps-board.c
3 *
4 * \brief Target board GPS 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 "board-config.h"
24 #include "board.h"
25 #include "gpio.h"
26 #include "gps.h"
27 #include "uart.h"
28 #include "lpm-board.h"
29 #include "rtc-board.h"
30 #include "gps-board.h"
31
32 /*!
33 * FIFO buffers size
34 */
35 //#define FIFO_TX_SIZE 128
36 #define FIFO_RX_SIZE 128
37
38 //uint8_t TxBuffer[FIFO_TX_SIZE];
39 static uint8_t RxBuffer[FIFO_RX_SIZE];
40
41 /*!
42 * \brief Buffer holding the raw data received from the gps
43 */
44 static uint8_t NmeaString[128];
45
46 /*!
47 * \brief Maximum number of data byte that we will accept from the GPS
48 */
49 static volatile uint8_t NmeaStringSize = 0;
50
51 static Gpio_t GpsPowerEn;
52 static Gpio_t GpsPps;
53
54 static volatile bool GpsPowerEnInverted = false;
55
56 extern Uart_t Uart1;
57
GpsMcuOnPpsSignal(void * context)58 void GpsMcuOnPpsSignal( void* context )
59 {
60 bool parseData = false;
61
62 GpsPpsHandler( &parseData );
63
64 if( parseData == true )
65 {
66 // Disables lowest power modes
67 LpmSetStopMode( LPM_GPS_ID , LPM_DISABLE );
68
69 UartInit( &Uart1, UART_1, GPS_UART_TX, GPS_UART_RX );
70 UartConfig( &Uart1, RX_ONLY, 9600, UART_8_BIT, UART_1_STOP_BIT, NO_PARITY, NO_FLOW_CTRL );
71 }
72 }
73
GpsMcuInvertPpsTrigger(void)74 void GpsMcuInvertPpsTrigger( void )
75 {
76
77 }
78
GpsMcuInit(void)79 void GpsMcuInit( void )
80 {
81 NmeaStringSize = 0;
82
83 switch( BoardGetVersion( ).Fields.Major )
84 {
85 case 2:
86 GpsPowerEnInverted = true;
87 break;
88 case 3:
89 GpsPowerEnInverted = false;
90 break;
91 default:
92 break;
93 }
94 GpioInit( &GpsPowerEn, GPS_POWER_ON, PIN_OUTPUT, PIN_PUSH_PULL, PIN_NO_PULL, 1 );
95
96 GpioInit( &GpsPps, GPS_PPS, PIN_INPUT, PIN_PUSH_PULL, PIN_NO_PULL, 0 );
97 GpioSetInterrupt( &GpsPps, IRQ_FALLING_EDGE, IRQ_VERY_LOW_PRIORITY, &GpsMcuOnPpsSignal );
98
99 FifoInit( &Uart1.FifoRx, RxBuffer, FIFO_RX_SIZE );
100 Uart1.IrqNotify = GpsMcuIrqNotify;
101
102 GpsMcuStart( );
103 }
104
GpsMcuStart(void)105 void GpsMcuStart( void )
106 {
107 if( GpsPowerEnInverted == true )
108 {
109 GpioWrite( &GpsPowerEn, 0 ); // power up the GPS
110 }
111 else
112 {
113 GpioWrite( &GpsPowerEn, 1 ); // power up the GPS
114 }
115 }
116
GpsMcuStop(void)117 void GpsMcuStop( void )
118 {
119 if( GpsPowerEnInverted == true )
120 {
121 GpioWrite( &GpsPowerEn, 1 ); // power down the GPS
122 }
123 else
124 {
125 GpioWrite( &GpsPowerEn, 0 ); // power down the GPS
126 }
127 }
128
GpsMcuProcess(void)129 void GpsMcuProcess( void )
130 {
131
132 }
133
GpsMcuIrqNotify(UartNotifyId_t id)134 void GpsMcuIrqNotify( UartNotifyId_t id )
135 {
136 uint8_t data;
137 if( id == UART_NOTIFY_RX )
138 {
139 if( UartGetChar( &Uart1, &data ) == 0 )
140 {
141 if( ( data == '$' ) || ( NmeaStringSize >= 127 ) )
142 {
143 NmeaStringSize = 0;
144 }
145
146 NmeaString[NmeaStringSize++] = ( int8_t )data;
147
148 if( data == '\n' )
149 {
150 NmeaString[NmeaStringSize++] = '\0';
151 GpsParseGpsData( ( int8_t* )NmeaString, NmeaStringSize );
152 UartDeInit( &Uart1 );
153 // Enables lowest power modes
154 LpmSetStopMode( LPM_GPS_ID , LPM_ENABLE );
155 }
156 }
157 }
158 }
159
