void SPIstartCommunication(void)
{
if(clk800msSPI == COMPLETE) {
SPI_ReadData(0x08);
SPI_ReadData(0x08);
clk800msSPI = RESTART;
}
}
int spi_slave_read(spi_t *obj)
{
uint32_t rx_data;
while (!spi_readable(obj));
rx_data = SPI_ReadData(spi_address[obj->instance]);
return rx_data & 0xffff;
}
int spi_master_write(spi_t *obj, int value)
{
uint32_t rx_data;
SPI_WriteData(spi_address[obj->instance], (uint16_t)value, kSPI_FrameAssert);
// wait rx buffer full
while (!spi_readable(obj));
rx_data = SPI_ReadData(spi_address[obj->instance]);
return rx_data & 0xffff;
}
int main ()
{
/* Configure port D pin 0 as output
* for signaling when tests pass
*/
DDR_SIGNAL = (1<<DD_SIGNAL);
uint8_t i, byte_received;
SPI_MasterInit();
for (i=0; i<100; i++)
{
SPI_MasterTransmit(0x81);
_delay_ms(5);
/* is SPI interrupt flag set? */
if (SPSR == 0x80)
{
/* if SPI interrupt flag is set
* clear it by reading the data
* in SPI data register */
byte_received = SPI_ReadData();
set_bit(SIGNAL_PORT, SIGNAL);
//_delay_ms(25);
/* did clearing interrupt
* flag succeed? */
if (SPSR == 0x00)
{
/* if yes blink LED */
clear_bit(SIGNAL_PORT, SIGNAL);
//_delay_ms(25);
}
}
/* if flag is not set blink slowly
* forever */
else
{
while (1)
{
set_bit(SIGNAL_PORT, SIGNAL);
_delay_ms(500);
clear_bit(SIGNAL_PORT, SIGNAL);
_delay_ms(500);
}
}
}
/* if all is well, after completing
* the requested transmissions
* the LED should go off and the
* processeor should do nothing
* happily ever after */
while (1);
;
return (0);
}
static void SPI_Read( uint32_t* data)
{
uint32_t lcm_id=0;
SPI_SetDatawidth(8);
//Read data 16bits
lcm_id = SPI_ReadData(1, 0); //unit of buswidth
{
uint32_t i=0;
for(i=0; i<1000; i++);
}
SPI_SetCsLow(0, FALSE);
*data = lcm_id;
}
