From 34203fbc9a7d2a7a286b16faa0381e098d738ac7 Mon Sep 17 00:00:00 2001
From: midelic <midelic@gmail.com>
Date: Thu, 28 Jul 2016 03:49:45 +0300
Subject: [PATCH] Add STM32 spi file

---
 Multiprotocol/SPI.ino | 150 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 150 insertions(+)
 create mode 100644 Multiprotocol/SPI.ino

diff --git a/Multiprotocol/SPI.ino b/Multiprotocol/SPI.ino
new file mode 100644
index 0000000..ee080f9
--- /dev/null
+++ b/Multiprotocol/SPI.ino
@@ -0,0 +1,150 @@
+/*SPI routines for STM32
+based on arduino maple library
+	By Midelic
+	on RCGroups
+*/
+
+
+
+
+SPIClass SPI_2(2); //Create an instance of the SPI Class called SPI_2 that uses the 2nd SPI Port
+
+void initSPI2() {
+  //SPI_DISABLE();
+  SPI_2.end();
+  SPI2_BASE->CR1 &= ~SPI_CR1_DFF_8_BIT;//8 bits format This bit should be written only when SPI is disabled (SPE = ?0?) for correct operation.
+  SPI_2.begin(); //Initialize the SPI_2 port.
+
+ SPI_2.setBitOrder(MSBFIRST); // Set the SPI_2 bit order
+ SPI_2.setDataMode(SPI_MODE0); //Set the  SPI_2 data mode 0
+ SPI_2.setClockDivider(SPI_CLOCK_DIV8);  //// Slow speed (36 / 8 = 4.5 MHz SPI_2 speed)
+}
+
+
+
+#ifdef XMEGA
+#define XNOP() NOP()
+#else
+#define XNOP()
+#endif
+
+#if defined STM32_board
+	
+void spi_write(uint8_t command){//working OK	
+SPI2_BASE->DR = command;//Write the first data item to be transmitted into the SPI_DR register (this clears the TXE flag)."
+while (!(SPI2_BASE->SR & SPI_SR_RXNE));
+command = SPI2_BASE->DR;// "... and read the last received data."
+}
+
+uint8_t spi_read(void) {
+spi_write(0x00);		
+return SPI2_BASE->DR;
+}
+
+uint8_t spi_Read(){	
+uint8_t rx=0;
+while(!(SPI2_BASE->SR & SPI_SR_TXE));
+while((SPI2_BASE->SR & SPI_SR_BSY));	
+//	
+SPI_DISABLE();
+SPI_SET_BIDIRECTIONAL();
+    volatile uint8_t x = SPI2_BASE->DR;
+    (void)x;
+SPI_ENABLE();
+//
+SPI_DISABLE();				  
+while(!(SPI2_BASE->SR& SPI_SR_RXNE));
+rx=SPI2_BASE->DR;
+SPI_SET_UNIDIRECTIONAL();
+SPI_ENABLE();
+return rx;
+}
+
+
+void SPI_ENABLE(){
+SPI2_BASE->CR1 |= SPI_CR1_SPE;
+}
+
+void SPI_DISABLE(){
+SPI2_BASE->CR1 &= ~SPI_CR1_SPE;
+}
+
+
+void SPI_SET_BIDIRECTIONAL()
+{
+  SPI2_BASE->CR1 |= SPI_CR1_BIDIMODE;
+  SPI2_BASE->CR1  &= ~ SPI_CR1_BIDIOE;//receive only
+}
+
+void SPI_SET_UNIDIRECTIONAL()
+{
+   SPI2_BASE->CR1 &= ~SPI_CR1_BIDIMODE;
+}
+
+#else
+
+void spi_write(uint8_t command)
+{
+	uint8_t n=8; 
+	SCK_off;//SCK start low
+	XNOP() ;
+	SDI_off;
+	XNOP() ;
+	while(n--) {
+		if(command&0x80)
+			SDI_on;
+		else 
+			SDI_off;
+		XNOP() ;
+		SCK_on;
+		NOP();
+		XNOP() ;
+		XNOP() ;
+		SCK_off;
+		command = command << 1;
+		XNOP() ;
+	}
+	SDI_on;
+} 
+   
+uint8_t spi_Read(void) {
+	uint8_t result=0;
+	uint8_t i;
+
+	SDI_SET_INPUT;
+	for(i=0;i<8;i++) {
+	     result<<=1;
+		if(SDI_1)  ///if SDIO =1 
+			result |= 0x01;
+		SCK_on;
+		NOP();
+		SCK_off;
+		NOP();
+	}
+	SDI_SET_OUTPUT;
+	return result;
+}
+
+
+uint8_t spi_read()
+{
+	uint8_t result;
+	uint8_t i;
+	result=0;
+	for(i=0;i<8;i++)
+	{                    
+		result<<=1;
+		if(SDO_1)  ///
+			result|=0x01;
+		SCK_on;
+		XNOP() ;
+		XNOP() ;
+		NOP();
+		SCK_off;
+		XNOP() ;
+		XNOP() ;
+		NOP();
+	}
+	return result;
+}
+#endif