Revision 0:4a8f916ef7b5, committed 2015-07-13

Comitter:

Jackson_lv

Date:

Mon Jul 13 09:21:53 2015 +0000

Commit message:

spi

Changed in this revision

diff -r 000000000000 -r 4a8f916ef7b5 spi.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/spi.c	Mon Jul 13 09:21:53 2015 +0000
@@ -0,0 +1,56 @@
+#include "spi.h"
+
+SPI device(SPI_MOSI, SPI_MISO, SPI_SCK);
+ 
+//SPI Init Code,visit SD Card/W25Q64/NRF24L01						  
+//SPI PIN Init
+void SPI_Init(void)
+{	 
+
+	//SPI2 clock frequence less than 36Mhz
+	SPI.frequency(36000000/256);
+	SPI_ReadWriteByte(0xff);//start transfer
+}   
+
+
+//SPI Speed Setting 
+//SpeedSet:0~7
+//SPI Speed = fAPB1/2^(SpeedSet+1)
+//APB1 clock usually is 36Mhz
+void SPI_SetSpeed(uint8_t SpeedSet)
+{
+	SpeedSet&=0X07;			//limit
+	SPI->CR1&=0XFFC7; 
+	SPI->CR1|=SpeedSet<<3;	//setting SPI speed
+	SPI->CR1|=1<<6; 		//SPI device enabled 
+} 
+
+
+//SPI readWrite a Byte
+//TxData:the data to write
+//return:the data read back
+u8 SPI_ReadWriteByte(uint8_t TxData)
+{		
+	u16 retry=0;				 
+	while((SPI->SR&1<<1)==0)		//waiting sending array is empty
+	{
+		retry++;
+		if(retry>=0XFFFE)return 0; 	//out of time quit
+	}			  
+	SPI->DR=TxData;	 	  		//send one byte
+	retry=0;
+	while((SPI->SR&1<<0)==0) 		//waiting received a byte
+	{
+		retry++;
+		if(retry>=0XFFFE)return 0;	//out of time quit
+	}	  						    
+	return SPI->DR;          		//return the data read	    
+}
+
+
+
+
+
+
+
+

diff -r 000000000000 -r 4a8f916ef7b5 spi.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/spi.h	Mon Jul 13 09:21:53 2015 +0000
@@ -0,0 +1,23 @@
+#ifndef __SPI_H
+#define __SPI_H
+
+#include "mbed.h"
+
+
+				    
+// SPI BUS Speed setting
+#define SPI_SPEED_2   		0
+#define SPI_SPEED_4   		1
+#define SPI_SPEED_8   		2
+#define SPI_SPEED_16  		3
+#define SPI_SPEED_32 		4
+#define SPI_SPEED_64 		5
+#define SPI_SPEED_128 		6
+#define SPI_SPEED_256 		7
+						  	    													  
+void SPI_Init(void);			 //SPI Init
+void SPI_SetSpeed(uint8_t SpeedSet); //SPI Speed Setting 
+uint8_t SPI_ReadWriteByte(uint8_t TxData);//SPI readWrite a Byte
+		 
+#endif
+