I was going through LMP90100 pdf (Microcontroller Firmware Considerations for the National LMP90100 Sensor AFE) SNAA075 for interfacing LMP90100 with PICs.
In the example code routines there was function given to write the data in controller memory to the device...In that can you explain me this.
//get the register upper 8bit address
instruction = (reg_addr >> 4) & 0x7;
instruction |= SPI_SEGMENT;
In it right shifting is done by 4.....why???
and also plz help me with these lines too....i am doing on mikroC PRO for pic
void write_spi8(UINT8 data)
{
spiA->SPI_TDR =data; // Send data - Starts as soon as this completes
while ((spiA->SPI_SR & TRANSFER_DONE) == 0); // Wait for transfer done
}
{
spiA->SPI_TDR =data; // Send data - Starts as soon as this completes
while ((spiA->SPI_SR & TRANSFER_DONE) == 0); // Wait for transfer done
}
// read 8 bit data through spi
void read_spi8(UINT8 *data)
{
spiA->SPI_TDR =0xFF; //Send data - Starts as soon as this completes
while ((spiA->SPI_SR & TRANSFER_DONE) == 0); // Wait for transfer done
*data = (spiA->SPI_RDR & 0x000000FF);
}
{
spiA->SPI_TDR =0xFF; //Send data - Starts as soon as this completes
while ((spiA->SPI_SR & TRANSFER_DONE) == 0); // Wait for transfer done
*data = (spiA->SPI_RDR & 0x000000FF);
}
Thanks...!!
