//-----------------------------------------------------------------------------
// F12x_SPI0_Master.c
//-----------------------------------------------------------------------------
// Copyright 2006 Silicon Laboratories, Inc.
// http://www.silabs.com
//
// Program Description:
//
// This program configures a C8051F12x as a 4-wire SPI Single Master.
//
// The SPI clock in this example is limited to 500 kHz (with a SYSCLK of 24.5
// MHz)when used with the SPI0_Slave code example. During a SPI_Read, the
// slave needs some time to interpret the command and write the appropriate
// data to the SPI0DAT register, and the slave no longer has enough time to
// complete theSPI_READ_BUFFER command with a clock greater than 500 kHz. For
// faster SPI clocks, a dummy byte between the command and the first byte of
// Read data or a faster SYSCLK will be required.
//
// This example is intended to be used with the SPI0_Slave example.
//
// Pinout:
//
// P0.0 - SPI SCK (digital output, push-pull)
// P0.1 - SPI MISO (digital input, open-drain)
// P0.2 - SPI MOSI (digital output, push-pull)
// P0.3 - SPI NSS (digital output, push-pull)
//
// P1.6 - LED (digital output, push-pull)
//
// all other port pins unused.
//
//
// How To Test:
//
// 1) Download the code to a F120-TB that is connected as above to
// another device running the SPI0_Slave code.
// 2) Verify that the J3 jumper is populated.
// 3) Run the code.
// 4) If the communication passes, the LEDs on both the Master and Slave
// boards will blink slowly. If it fails, the LEDs will be OFF.
//
//
// Target: C8051F12x
// Tool chain: Keil C51 7.50 / Keil EVAL C51
// Command Line: None
//
// Release 1.0
// -Initial Revision (TP)
// -14 DEC 2006
//
//-----------------------------------------------------------------------------
// Includes
//-----------------------------------------------------------------------------
#include <C8051F120.h> // SFR declarations
//-----------------------------------------------------------------------------
// Global Constants
//-----------------------------------------------------------------------------
#define SYSCLK 24500000 // Internal oscillator frequency in Hz
#define SPI_CLOCK 500000 // Maximum SPI clock
// The SPI clock is a maximum of 500 kHz
// with a SYSCLK of 24.5 MHz when this
// example is used with the SPI0_Slave
// code example.
#define MAX_BUFFER_SIZE 8 // Maximum buffer Master will send
// Instruction Set
#define SLAVE_LED_ON 0x01 // Turn the Slave LED on
#define SLAVE_LED_OFF 0x02 // Turn the Slave LED off
#define SPI_WRITE 0x04 // Send a byte from the Master to the
// Slave
#define SPI_READ 0x08 // Send a byte from the Slave to the
// Master
#define SPI_WRITE_BUFFER 0x10 // Send a series of bytes from the
// Master to the Slave
#define SPI_READ_BUFFER 0x20 // Send a series of bytes from the Slave
// to the Master
#define ERROR_OCCURRED 0x40 // Indicator for the Slave to tell the
// Master an error occurred
sbit LED = P1^6; // LED='1' means ON
//-----------------------------------------------------------------------------
// Global Variables
//-----------------------------------------------------------------------------
unsigned char SPI_Data = 0xA5;
unsigned char SPI_Data_Array[MAX_BUFFER_SIZE] = {0};
bit Error_Flag = 0;
unsigned char Command = 0x00;
//-----------------------------------------------------------------------------
// Function Prototypes
//-----------------------------------------------------------------------------
void Watchdog_Init (void);
void Oscillator_Init (void);
void Port_Init (void);
void SPI0_Init (void);
void Init_Device (void);
void SPI_LED_On (void);
void SPI_LED_Off (void);
void SPI_Byte_Write (void);
void SPI_Byte_Read (void);
void SPI_Array_Write (void);
void SPI_Array_Read (void);
void Delay(void);
//-----------------------------------------------------------------------------
// main() Routine
//-----------------------------------------------------------------------------
void main (void)
{
unsigned char test_value = 0x55;
unsigned char test_array[MAX_BUFFER_SIZE] = {1,2,3,4,5,6,7,8};
unsigned char i;
Init_Device (); // Initializes hardware peripherals
EA = 1; // Enable global interrupts
LED = 0;
SFRPAGE = LEGACY_PAGE;
// TEST BEGIN --------------------------------------------------------------
SPI_Data = test_value;
// Write a value
SPI_Byte_Write ();
while (!NSSMD0); // Wait until the Write transfer has
// finished
// Read the same value back
SPI_Data = 0x00;
SPI_Byte_Read ();
while (!NSSMD0); // Wait until the Read transfer has
// finished
// Check if the sent value and returned value match
if (SPI_Data != test_value)
{
Error_Flag = 1;
}
// Copy test_array into SPI_Data_Array
for (i = 0; i < MAX_BUFFER_SIZE; i++)
{
SPI_Data_Array[i] = test_array[i];
}
// Send the array to the slave
SPI_Array_Write ();
while (!NSSMD0); // Wait until the Write transfer has
// finished
// Clear SPI_Data_Array for the SPI_Buffer_Read function
for (i = 0; i < MAX_BUFFER_SIZE; i++)
{
SPI_Data_Array[i] = 0;
}
// Read the array back from the slave
SPI_Array_Read ();
while (!NSSMD0); // Wait until the Read transfer has
// finished
// Check if the received array matches the sent array
for (i = 0; i < MAX_BUFFER_SIZE; i++)
{
if (SPI_Data_Array[i] != test_array[i])
{
Error_Flag = 1;
}
}
// END OF TEST -------------------------------------------------------------
while (1)
{
// If no error has occurred, blink the LEDs on the Master and Slave
// boards
if (Error_Flag == 0)
{
LED = 1;
SPI_LED_On ();
while (!NSSMD0);
Delay ();
SPI_LED_Off ();
LED = 0;
while (!NSSMD0);
Delay ();
}
};
}
//-----------------------------------------------------------------------------
// Initialization Subroutines
//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
// Watchdog_Init
//-----------------------------------------------------------------------------
//
// Return Value : None
// Parameters : None
//
// This function disables the watchdog timer.
//
//-----------------------------------------------------------------------------
void Watchdog_Init (void)
{
unsigned char SFRPAGE_save = SFRPAGE; // Save the current SFRPAGE
SFRPAGE = CONFIG_PAGE; // Switch to the necessary SFRPAGE
WDTCN = 0xDE; // Disable the Watchdog Timer
WDTCN = 0xAD;
SFRPAGE = SFRPAGE_save; // Restore the SFRPAGE
}
//-----------------------------------------------------------------------------
// Oscillator_Init
//-------------------------------
