Texas Instruments MSP430

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MPL115A1_SDN_PORT_DIR |= MPL115A1_SDN_pin;
MPL115A1_CSN_PORT_DIR |= MPL115A1_CSN_pin;
MPL115A1_SDN_HIGH();
MPL115A1_CSN_HIGH();
HW_SPI_init();
MPL115A1_get_coefficients();
}
unsigned char MPL115A1_read(unsigned char address)
{
unsigned char value = 0;
MPL115A1_CSN_LOW();
delay_ms(3);
SPI_write(address);
value = SPI_read();
value = SPI_transfer(address);
MPL115A1_CSN_HIGH();
return value;
}
void MPL115A1_write(unsigned char address, unsigned char value)
{
MPL115A1_CSN_LOW();
delay_ms(3);
SPI_write((address & 0x7F));
SPI_write(value);
MPL115A1_CSN_HIGH();
}
void MPL115A1_get_coefficients(void)
{
unsigned int hb = 0;
unsigned int lb = 0;
MPL115A1_get_bytes(&hb, &lb, A0_H);
coefficients.A0 = ((hb << 5) + (lb >> 3) + ((lb & 0x07) / 8.0));
MPL115A1_get_bytes(&hb, &lb, B1_H);
coefficients.B1 = (((((hb & 0x1F) * 0x0100) + lb) / 8192.0) - 3.0);
MPL115A1_get_bytes(&hb, &lb, B2_H);
coefficients.B2 = (((((hb - 0x80) << 8) + lb) / 16384.0) - 2.0);
MPL115A1_get_bytes(&hb, &lb, C12_H);
coefficients.C12 = (((hb * 0x100) + lb) / 16777216.0);
}
void MPL115A1_get_bytes(unsigned int *hb, unsigned int *lb, unsigned char address)
{
*hb = ((unsigned int)MPL115A1_read(address));
*lb = ((unsigned int)MPL115A1_read((address + 2)));