C8051F040的SPI程序2

//
// The SPI clock in this example is limited to 500 kHz when used with the
// SPI0_Slave code example. During a SPI_Read, the slave needs some time to
// boards will blink slowly. If it fails, the LEDs will be OFF.
//
//
// Target:
C8051F04x
// Tool chain: Keil C51 7.50 / Keil EVAL C51
// Command Line: None // // Release 1.0 // -Initial Revision (TP) // -14 DEC 2006 //
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++) {
EA = 1;
// Enable global interrupts
LED = 0;
SFRPAGE = LEGACY_PAGE;
// TEST BEGIN --------------------------------------------------------------
SPI_Data = test_value;
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++) {
// clocks, a dummy byte between the command and the first byte of Read data
// will be required.
//
// This example is intended to be used with the SPI0_Slave example.
// 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 F040-TB that is connected as above to
#define MAX_BUFFER_SIZE 8
// Maximum buffer Master will send
// Inse SLAVE_LED_ON
0x01
#define SLAVE_LED_OFF 0x02
#define SPI_WRITE
0x04
#define SPI_READ
unsigned char SPI_Data = 0xA5;
unsigned char SPI_Data_Array[MAX_BUFFER_SIZE] = {0};
bit Error_Flag = 0;
unsigned char Command = 0x00;
//----------------------------------------------------------------------------// Function Prototypes //-----------------------------------------------------------------------------
//
// 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)
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) {
// 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 ();
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
// interpret the command and write the appropriate data to the SPI0DAT
// register, and the slave no longer has enough time to complete the
// SPI_READ_BUFFER command with a clock greater than 500 kHz. For faster SPI
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; }
#define SYSCLK
24500000 // Internal oscillator frequency in Hz
#define SPI_CLOCK
500000
// Maximum SPI clock // The SPI clock is a maximum of 500 kHz // when this example is used with // the SPI0_Slave code example.
//----------------------------------------------------------------------------// Includes //-----------------------------------------------------------------------------
#include <C8051F040.h>
// SFR declarations
//----------------------------------------------------------------------------// Global Constants //-----------------------------------------------------------------------------
sbit LED = P1^6;
// LED='1' means ON
//----------------------------------------------------------------------------// Global Variables
//-----------------------------------------------------------------------------
0x08
#define SPI_WRITE_BUFFER 0x10
#define SPI_READ_BUFFER 0x20
#define ERROR_OCCURRED 0x40