FC_IO_SPI Class Reference

SPI Master. More...

Inheritance diagram for FC_IO_SPI:

Public Member Functions
	FC_IO_SPI (int bitrate, int mode, int fifo_depth=4)
int	WaitReady ()
bool	IsReady ()
bool	StartWrite (const U8 *pD, int nD)
bool	Read (U8 *pD, int nD)
bool	WriteRead (const U8 *pWD, U8 *pRD, int nD)
U32	GetNumValid ()
U32	GetNumReady ()
void	ResetReadFIFO ()

Detailed Description

SPI Master.

Adds to interface:
<name>_SCLK : out std_logic
<name>_MOSI : out std_logic
<name>_MISO : in std_logic
<name>_SSn : out std_logic
where <name> is c++ object name.
Any number of instances are allowed.

#include <stdlib.h>
#include <math.h>
 
#include "fc_io.h"
#include "fc_system.h"
 
// Function to stream an int
template<class T>
T& operator<<(T& os, int v) 
{
    char b[16];
    itoa(v,b,10);
    os << b;
    return os;
} 
 
short GetAccel(FC_IO_SPI& spi, U8 reg)
{
    U8 buff[4] = {0x0B, reg, 0x00, 0x00 }; // 0x0B Read command
    spi.WriteRead( buff, buff, 4 );
    return buff[3]<<8|buff[2];
}
 
int main(void)
{
//% hw_begin
    FC_IO_Clk Clk( 100 ); 
    FC_IO_UART_TX uart_tx( 115200, 64 );
    FC_IO_SPI accel( 1000000, 0, 8 );
    FC_System_Timer timer;
//% hw_end
 
    // Start ADXL362 measure
    U8 spi_command[3] = { 0x0A, 0x2D, 0x02 };
    // 0x0A Write 
    // 0x2D POWER_CTL reg
    // 0x02 Measurement Mode    
    accel.StartWrite( spi_command, 3 );               
    accel.WaitReady();
 
    for(;;) {
        timer.Sleep( 100, TU_ms );
 
        // Read accelorometer
        float x = GetAccel(accel,0x0E); 
        float y = GetAccel(accel,0x10); 
        float z = GetAccel(accel,0x12);
 
        // Calculate roll and pitch angles and coverts from radians to deg angles*10 (180/pi)
        int roll = atanf( x/sqrtf(y*y+z*z)  ) * 573.0f;
        int pitch = atanf( y/sqrtf(x*x+z*z)  ) * 573.0f;
 
        // Print roll and pitch angles with one decimal
        uart_tx << "Roll:  " << roll/10 << "." << abs(roll%10);
        uart_tx << " \tPitch: " << pitch/10 << "." << abs(pitch%10) << "\r\n";
    }
}