Rev Author Line No. Line
2767 kaklik 1 #include <main.h>
2  
3 /*
4 MPL115A1 SDN - +3.3V (always power on)
5 MPL115A1 #CS - PIN_C2
2769 kaklik 6 MPL115A1 DOUT - PIN_C4
7 MPL115A1 DIN - PIN_C5
2767 kaklik 8 MPL115A1 SCLK - PIN_C3
9 MPL115A1 GND - GND
10 MPL115A1 VDD - +3.3V
11 */
12  
13 #define CSN_SPI PIN_C2
14  
15 // SPI mode definitions.
16 #define SPI_MODE_0 (SPI_L_TO_H | SPI_XMIT_L_TO_H)
17 #define SPI_MODE_1 (SPI_L_TO_H)
18 #define SPI_MODE_2 (SPI_H_TO_L)
19 #define SPI_MODE_3 (SPI_H_TO_L | SPI_XMIT_L_TO_H)
20  
2772 kaklik 21 unsigned int16 a0;
22 unsigned int16 b1;
23 unsigned int16 b2;
24 unsigned int16 c12;
2767 kaklik 25  
26  
2772 kaklik 27 int MPL_init()
28 {
29 unsigned int8 a0_MSB, a0_LSB;
30 unsigned int8 b1_MSB, b1_LSB;
31 unsigned int8 b2_MSB, b2_LSB;
32 unsigned int8 c12_MSB, c12_LSB;
2767 kaklik 33  
2772 kaklik 34 output_low(CSN_SPI);
2767 kaklik 35  
2772 kaklik 36 spi_write(0x88); // get MSB for a0
37 a0_MSB = spi_read(0x00);
38 spi_write(0x8A); // get LSB for a0
39 a0_LSB = spi_read(0x00);
2767 kaklik 40  
2772 kaklik 41 spi_write(0x8C); // get MSB for a0
42 b1_MSB = spi_read(0x00);
43 spi_write(0x8E); // get LSB for a0
44 b1_LSB = spi_read(0x00);
2767 kaklik 45  
2772 kaklik 46 spi_write(0x90); // get MSB for a0
47 b2_MSB = spi_read(0x00);
48 spi_write(0x92); // get LSB for a0
49 b2_LSB = spi_read(0x00);
50  
51 spi_write(0x94); // get MSB for a0
52 c12_MSB = spi_read(0x00);
53 spi_write(0x96); // get LSB for a0
54 c12_LSB = spi_read(0x00);
55  
56 spi_read(0x00);
57 output_high(CSN_SPI);
2767 kaklik 58  
2772 kaklik 59 a0 = ((int16) a0_MSB << 8) + a0_LSB;
60 b1 = ((int16) b1_MSB << 8) + b1_LSB;
61 b2 = ((int16) b2_MSB << 8) + b2_LSB;
62 c12 = ((int16) c12_MSB << 8) + c12_LSB;
63 }
64  
65 float MPL_get_pressure()
66 {
67 int8 LSB_data, MSB_data;
68 int16 ADC_pressure, ADC_temperature;
69  
70 output_low(CSN_SPI); //Start temperature and pressure conversion
71 spi_write(0x24);
72 spi_write(0x00);
2767 kaklik 73 output_high(CSN_SPI);
74  
2772 kaklik 75 delay_ms(3);
76  
77 output_low(CSN_SPI); // get MSB for Pressure
78 spi_write(0x80);
79 LSB_data = spi_read(0x00);
80 spi_write(0x82); // get LSB for Pressure
81 MSB_data = spi_read(0x00);
2767 kaklik 82  
2772 kaklik 83 ADC_pressure = ((int16) MSB_data << 8) + LSB_data; // conversion of 8bit registers to 16bit variable
2767 kaklik 84  
2772 kaklik 85 spi_write(0x84);
86 LSB_data = spi_read(0x00);
87 spi_write(0x86); // get LSB for Temperature
88 MSB_data = spi_read(0x00);
89 spi_read(0x00);
90 output_high(CSN_SPI);
91  
92 ADC_temperature = ((int16) MSB_data << 8) + LSB_data; // conversion of 8bit registers to 16bit variable
93  
94 // printf("%lX %lX\r\n", ADC_pressure, ADC_temperature);
95  
96 return (a0 + (b1 + c12 * ADC_temperature) * ADC_pressure + b2 * ADC_temperature );
2767 kaklik 97 }
2772 kaklik 98  
99 void main()
100 {
101 printf("Start \r\n");
102 setup_spi(SPI_MASTER | SPI_MODE_0 | SPI_CLK_DIV_64);
103 output_high(CSN_SPI);
104 delay_ms(100);
105  
106 MPL_init();
107  
108 while(true)
109 {
110 printf("%f \r\n", MPL_get_pressure());
111 delay_ms(100);
112 }
113 }