1 |
#include <main.h> |
1 |
#include <main.h> |
2 |
|
2 |
|
3 |
/* |
3 |
/* |
4 |
MPL115A1 SDN - +3.3V (always power on) |
4 |
MPL115A1 SDN - +3.3V (always power on) |
5 |
MPL115A1 #CS - PIN_C2 |
5 |
MPL115A1 #CS - PIN_C2 |
6 |
MPL115A1 DOUT - PIN_C4 |
6 |
MPL115A1 DOUT - PIN_C4 |
7 |
MPL115A1 DIN - PIN_C5 |
7 |
MPL115A1 DIN - PIN_C5 |
8 |
MPL115A1 SCLK - PIN_C3 |
8 |
MPL115A1 SCLK - PIN_C3 |
9 |
MPL115A1 GND - GND |
9 |
MPL115A1 GND - GND |
10 |
MPL115A1 VDD - +3.3V |
10 |
MPL115A1 VDD - +3.3V |
11 |
*/ |
11 |
*/ |
12 |
|
12 |
|
13 |
#define CSN_SPI PIN_C2 |
13 |
#define CSN_SPI PIN_C2 |
14 |
|
14 |
|
15 |
// SPI mode definitions. |
15 |
// SPI mode definitions. |
16 |
#define SPI_MODE_0 (SPI_L_TO_H | SPI_XMIT_L_TO_H) |
16 |
#define SPI_MODE_0 (SPI_L_TO_H | SPI_XMIT_L_TO_H) |
17 |
#define SPI_MODE_1 (SPI_L_TO_H) |
17 |
#define SPI_MODE_1 (SPI_L_TO_H) |
18 |
#define SPI_MODE_2 (SPI_H_TO_L) |
18 |
#define SPI_MODE_2 (SPI_H_TO_L) |
19 |
#define SPI_MODE_3 (SPI_H_TO_L | SPI_XMIT_L_TO_H) |
19 |
#define SPI_MODE_3 (SPI_H_TO_L | SPI_XMIT_L_TO_H) |
20 |
|
20 |
|
21 |
signed int16 a0; |
21 |
float a0; |
22 |
signed int16 b1; |
22 |
float b1; |
23 |
signed int16 b2; |
23 |
float b2; |
24 |
signed int16 c12; |
24 |
float c12; |
25 |
|
25 |
|
26 |
|
26 |
|
27 |
int MPL_init() |
27 |
void MPL_init() |
28 |
{ |
28 |
{ |
29 |
unsigned int8 a0_MSB, a0_LSB; |
29 |
unsigned int8 a0_MSB, a0_LSB; |
30 |
unsigned int8 b1_MSB, b1_LSB; |
30 |
unsigned int8 b1_MSB, b1_LSB; |
31 |
unsigned int8 b2_MSB, b2_LSB; |
31 |
unsigned int8 b2_MSB, b2_LSB; |
32 |
unsigned int8 c12_MSB, c12_LSB; |
32 |
unsigned int8 c12_MSB, c12_LSB; |
33 |
|
33 |
|
34 |
output_low(CSN_SPI); |
34 |
output_low(CSN_SPI); |
35 |
|
35 |
|
36 |
spi_write(0x88); // get MSB for a0 |
36 |
spi_write(0x88); // get MSB for a0 |
37 |
a0_MSB = spi_read(0x00); |
37 |
a0_MSB = spi_read(0x00); |
38 |
spi_write(0x8A); // get LSB for a0 |
38 |
spi_write(0x8A); // get LSB for a0 |
39 |
a0_LSB = spi_read(0x00); |
39 |
a0_LSB = spi_read(0x00); |
40 |
|
40 |
|
41 |
spi_write(0x8C); // get MSB for a0 |
41 |
spi_write(0x8C); // get MSB for a0 |
42 |
b1_MSB = spi_read(0x00); |
42 |
b1_MSB = spi_read(0x00); |
43 |
spi_write(0x8E); // get LSB for a0 |
43 |
spi_write(0x8E); // get LSB for a0 |
44 |
b1_LSB = spi_read(0x00); |
44 |
b1_LSB = spi_read(0x00); |
45 |
|
45 |
|
46 |
spi_write(0x90); // get MSB for a0 |
46 |
spi_write(0x90); // get MSB for a0 |
47 |
b2_MSB = spi_read(0x00); |
47 |
b2_MSB = spi_read(0x00); |
48 |
spi_write(0x92); // get LSB for a0 |
48 |
spi_write(0x92); // get LSB for a0 |
49 |
b2_LSB = spi_read(0x00); |
49 |
b2_LSB = spi_read(0x00); |
50 |
|
50 |
|
51 |
spi_write(0x94); // get MSB for a0 |
51 |
spi_write(0x94); // get MSB for a0 |
52 |
c12_MSB = spi_read(0x00); |
52 |
c12_MSB = spi_read(0x00); |
53 |
spi_write(0x96); // get LSB for a0 |
53 |
spi_write(0x96); // get LSB for a0 |
54 |
c12_LSB = spi_read(0x00); |
54 |
c12_LSB = spi_read(0x00); |
55 |
|
55 |
|
56 |
spi_read(0x00); |
56 |
spi_read(0x00); |
57 |
output_high(CSN_SPI); |
57 |
output_high(CSN_SPI); |
58 |
|
58 |
|
59 |
a0 = ((int16) a0_MSB << 8) + a0_LSB; |
59 |
a0 = (a0_MSB << 5) + (a0_LSB >> 3) + (a0_LSB & 0x07)/8.0; |
60 |
b1 = ((int16) b1_MSB << 8) + b1_LSB; |
60 |
b1 = ((((b1_MSB & 0x1F) * 0x100) + b1_LSB) / 8192.0) - 3; |
61 |
b2 = ((int16) b2_MSB << 8) + b2_LSB; |
61 |
b2 = ((((b2_MSB - 0x80) << 8) + b2_LSB)/ 16384.0) - 2; |
62 |
c12 = ((int16) c12_MSB << 8) + c12_LSB; |
62 |
c12 =(((c12_MSB * 0x100) + c12_LSB)/16777216.0); |
63 |
} |
63 |
} |
64 |
|
64 |
|
65 |
float MPL_get_pressure() |
65 |
float MPL_get_pressure() |
66 |
{ |
66 |
{ |
67 |
unsigned int8 LSB_data, MSB_data; |
67 |
unsigned int8 LSB_data, MSB_data; |
68 |
unsigned int16 ADC_pressure, ADC_temperature; |
68 |
unsigned int16 ADC_pressure, ADC_temperature; |
- |
|
69 |
float Pcomp; |
69 |
|
70 |
|
70 |
output_low(CSN_SPI); //Start temperature and pressure conversion |
71 |
output_low(CSN_SPI); //Start temperature and pressure conversion |
71 |
spi_write(0x24); |
72 |
spi_write(0x24); |
72 |
spi_write(0x00); |
73 |
spi_write(0x00); |
73 |
output_high(CSN_SPI); |
74 |
output_high(CSN_SPI); |
74 |
|
75 |
|
75 |
delay_ms(10); |
76 |
delay_ms(10); |
76 |
|
77 |
|
77 |
output_low(CSN_SPI); // get MSB for Pressure |
78 |
output_low(CSN_SPI); // get MSB for Pressure |
78 |
spi_write(0x80); |
79 |
spi_write(0x80); |
79 |
LSB_data = spi_read(0x00); |
- |
|
80 |
spi_write(0x82); // get LSB for Pressure |
- |
|
81 |
MSB_data = spi_read(0x00); |
80 |
MSB_data = spi_read(0x00); |
- |
|
81 |
spi_write(0x82); // get LSB for Pressure |
- |
|
82 |
LSB_data = spi_read(0x00); |
82 |
output_high(CSN_SPI); |
83 |
output_high(CSN_SPI); |
83 |
|
84 |
|
84 |
printf("%lX %lX\r\n", MSB_data, LSB_data); |
85 |
printf("%lX %lX\r\n", MSB_data, LSB_data); |
85 |
ADC_pressure = ((int16) MSB_data << 8) + LSB_data; // conversion of 8bit registers to 16bit variable |
86 |
ADC_pressure = (((unsigned int16) MSB_data << 8) + LSB_data ) >> 6; // conversion of 8bit registers to 16bit variable |
86 |
|
87 |
|
87 |
output_low(CSN_SPI); |
88 |
output_low(CSN_SPI); |
88 |
spi_write(0x84); |
89 |
spi_write(0x84); |
89 |
LSB_data = spi_read(0x00); |
- |
|
90 |
spi_write(0x86); // get LSB for Temperature |
- |
|
91 |
MSB_data = spi_read(0x00); |
90 |
MSB_data = spi_read(0x00); |
- |
|
91 |
spi_write(0x86); // get LSB for Temperature |
- |
|
92 |
LSB_data = spi_read(0x00); |
92 |
spi_read(0x00); |
93 |
spi_read(0x00); |
93 |
output_high(CSN_SPI); |
94 |
output_high(CSN_SPI); |
94 |
|
95 |
|
95 |
printf("%lX %lX\r\n", MSB_data, LSB_data); |
96 |
printf("%lX %lX\r\n", MSB_data, LSB_data); |
96 |
ADC_temperature = ((int16) MSB_data << 8) + LSB_data; // conversion of 8bit registers to 16bit variable |
97 |
ADC_temperature = (((unsigned int16) MSB_data << 8) + LSB_data ) >> 6; // conversion of 8bit registers to 16bit variable |
97 |
|
98 |
|
98 |
printf("%lX %lX\r\n", ADC_pressure, ADC_temperature); |
99 |
printf("%lu %lu \r\n", ADC_pressure, ADC_temperature); |
- |
|
100 |
|
- |
|
101 |
Pcomp = (a0 + (b1 + c12 * ADC_temperature) * ADC_pressure + b2 * ADC_temperature ); |
99 |
|
102 |
|
100 |
return (a0 + (b1 + c12 * ADC_temperature) * ADC_pressure + b2 * ADC_temperature ); |
103 |
return (Pcomp * ((115.0 - 50.0)/1023.0) + 50.0); |
101 |
} |
104 |
} |
102 |
|
105 |
|
103 |
void main() |
106 |
void main() |
104 |
{ |
107 |
{ |
105 |
printf("Start \r\n"); |
108 |
printf("Start \r\n"); |
106 |
setup_spi(SPI_MASTER | SPI_MODE_0 | SPI_CLK_DIV_64); |
109 |
setup_spi(SPI_MASTER | SPI_MODE_0 | SPI_CLK_DIV_64); |
107 |
output_high(CSN_SPI); |
110 |
output_high(CSN_SPI); |
108 |
delay_ms(100); |
111 |
delay_ms(100); |
109 |
|
112 |
|
110 |
MPL_init(); |
113 |
MPL_init(); |
111 |
|
114 |
|
112 |
while(true) |
115 |
while(true) |
113 |
{ |
116 |
{ |
114 |
// MPL_init(); |
117 |
// MPL_init(); |
115 |
// printf("%f \r\n", MPL_get_pressure()); |
118 |
printf("%f \r\n", MPL_get_pressure()); |
116 |
// printf("%ld %ld %ld %ld \r\n",a0, b1, b2, c12); |
119 |
// printf("%ld %ld %ld %ld \r\n",a0, b1, b2, c12); |
117 |
MPL_get_pressure(); |
120 |
//MPL_get_pressure(); |
118 |
|
121 |
|
119 |
delay_ms(500); |
122 |
delay_ms(500); |
120 |
} |
123 |
} |
121 |
} |
124 |
} |