#include <main.h>
/*
MPL115A1 SDN - +3.3V (always power on)
MPL115A1 #CS - PIN_C2
MPL115A1 DOUT - PIN_C4
MPL115A1 DIN - PIN_C5
MPL115A1 SCLK - PIN_C3
MPL115A1 GND - GND
MPL115A1 VDD - +3.3V
*/
#define CSN_SPI PIN_C2
// SPI mode definitions.
#define SPI_MODE_0 (SPI_L_TO_H | SPI_XMIT_L_TO_H)
#define SPI_MODE_1 (SPI_L_TO_H)
#define SPI_MODE_2 (SPI_H_TO_L)
#define SPI_MODE_3 (SPI_H_TO_L | SPI_XMIT_L_TO_H)
signed int16 a0;
signed int16 b1;
signed int16 b2;
signed int16 c12;
int MPL_init()
{
unsigned int8 a0_MSB, a0_LSB;
unsigned int8 b1_MSB, b1_LSB;
unsigned int8 b2_MSB, b2_LSB;
unsigned int8 c12_MSB, c12_LSB;
output_low(CSN_SPI);
spi_write(0x88); // get MSB for a0
a0_MSB = spi_read(0x00);
spi_write(0x8A); // get LSB for a0
a0_LSB = spi_read(0x00);
spi_write(0x8C); // get MSB for a0
b1_MSB = spi_read(0x00);
spi_write(0x8E); // get LSB for a0
b1_LSB = spi_read(0x00);
spi_write(0x90); // get MSB for a0
b2_MSB = spi_read(0x00);
spi_write(0x92); // get LSB for a0
b2_LSB = spi_read(0x00);
spi_write(0x94); // get MSB for a0
c12_MSB = spi_read(0x00);
spi_write(0x96); // get LSB for a0
c12_LSB = spi_read(0x00);
spi_read(0x00);
output_high(CSN_SPI);
a0 = ((int16) a0_MSB << 8) + a0_LSB;
b1 = ((int16) b1_MSB << 8) + b1_LSB;
b2 = ((int16) b2_MSB << 8) + b2_LSB;
c12 = ((int16) c12_MSB << 8) + c12_LSB;
}
float MPL_get_pressure()
{
unsigned int8 LSB_data, MSB_data;
unsigned int16 ADC_pressure, ADC_temperature;
output_low(CSN_SPI); //Start temperature and pressure conversion
spi_write(0x24);
spi_write(0x00);
output_high(CSN_SPI);
delay_ms(10);
output_low(CSN_SPI); // get MSB for Pressure
spi_write(0x80);
LSB_data = spi_read(0x00);
spi_write(0x82); // get LSB for Pressure
MSB_data = spi_read(0x00);
output_high(CSN_SPI);
printf("%lX %lX\r\n", MSB_data, LSB_data);
ADC_pressure = ((int16) MSB_data << 8) + LSB_data; // conversion of 8bit registers to 16bit variable
output_low(CSN_SPI);
spi_write(0x84);
LSB_data = spi_read(0x00);
spi_write(0x86); // get LSB for Temperature
MSB_data = spi_read(0x00);
spi_read(0x00);
output_high(CSN_SPI);
printf("%lX %lX\r\n", MSB_data, LSB_data);
ADC_temperature = ((int16) MSB_data << 8) + LSB_data; // conversion of 8bit registers to 16bit variable
printf("%lX %lX\r\n", ADC_pressure, ADC_temperature);
return (a0 + (b1 + c12 * ADC_temperature) * ADC_pressure + b2 * ADC_temperature );
}
void main()
{
printf("Start \r\n");
setup_spi(SPI_MASTER | SPI_MODE_0 | SPI_CLK_DIV_64);
output_high(CSN_SPI);
delay_ms(100);
MPL_init();
while(true)
{
// MPL_init();
// printf("%f \r\n", MPL_get_pressure());
// printf("%ld %ld %ld %ld \r\n",a0, b1, b2, c12);
MPL_get_pressure();
delay_ms(500);
}
}