Diff: SPIClass.cpp

Revision:

0:db8030e71f55

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/SPIClass.cpp	Tue Sep 13 06:01:19 2016 +0000
@@ -0,0 +1,124 @@
+/*
+ * Copyright (c) 2010 by Cristian Maglie <c.maglie@bug.st>
+ * SPI Master library for arduino.
+ *
+ * This file is free software; you can redistribute it and/or modify
+ * it under the terms of either the GNU General Public License version 2
+ * or the GNU Lesser General Public License version 2.1, both as
+ * published by the Free Software Foundation.
+ */
+
+#include "arduino.h"
+#include "SPIClass.h"
+
+SPIClass SPI;
+
+void SPIClass::begin() {
+
+	// When the SS pin is set as OUTPUT, it can be used as
+	// a general purpose output port (it doesn't influence
+	// SPI operations).
+	pinMode(SS, OUTPUT);
+  
+	// Set SS to high so a connected chip will be "deselected" by default
+	digitalWrite(SS, HIGH);
+  
+	pinMode(SCK,  ALTERNATE);
+	pinMode(MOSI, ALTERNATE);
+	pinMode(MISO, ALTERNATE);
+  
+	spi = SPI1;
+	RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);
+
+	SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low;
+	SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge;
+	SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
+	SPI_InitStructure.SPI_BaudRatePrescaler = SPI_CLOCK_DIV4;	
+	SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
+	SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
+	SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
+	SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
+	SPI_InitStructure.SPI_CRCPolynomial = 7;
+
+	SPI_Init(spi,&SPI_InitStructure);
+	SPI_RxFIFOThresholdConfig(spi,SPI_RxFIFOThreshold_QF);
+	SPI_Cmd(spi,ENABLE);
+}
+
+
+void SPIClass::end() {
+	SPI_Cmd(spi,DISABLE);
+}
+
+void SPIClass::setBitOrder(uint8_t bitOrder)
+{
+	SPI_Cmd(spi,DISABLE);
+	if(bitOrder == LSBFIRST)
+	{
+		SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_LSB;
+	}
+	else
+	{
+		SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
+	}
+	SPI_Init(spi,&SPI_InitStructure);
+	SPI_Cmd(spi,ENABLE);
+}
+
+void SPIClass::setDataMode(uint8_t mode)
+{
+	SPI_Cmd(spi,DISABLE);
+	if (mode == SPI_MODE0)
+	{
+		SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low;
+		SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge;
+	} 
+	else if(mode == SPI_MODE1)
+	{
+		SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low;
+		SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;
+	} 
+	else if(mode == SPI_MODE2)
+	{
+		SPI_InitStructure.SPI_CPOL = SPI_CPOL_High;
+		SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge;
+	} 
+	else if(mode == SPI_MODE3)
+	{
+		SPI_InitStructure.SPI_CPOL = SPI_CPOL_High;
+		SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;
+	}
+
+	SPI_Init(spi,&SPI_InitStructure);
+	SPI_Cmd(spi,ENABLE);
+}
+
+void SPIClass::setClockDivider(uint8_t rate)
+{
+	SPI_Cmd(spi,DISABLE);
+	SPI_InitStructure.SPI_BaudRatePrescaler = rate;
+
+	SPI_Init(spi,&SPI_InitStructure);
+	SPI_Cmd(spi,ENABLE);
+}
+
+byte SPIClass::transfer(byte _data) {
+	uint8_t d = _data;
+
+    while (SPI_I2S_GetFlagStatus(spi,SPI_I2S_FLAG_TXE) == RESET);
+    SPI_SendData8(spi,d);
+
+    while (SPI_I2S_GetFlagStatus(spi,SPI_I2S_FLAG_RXNE) == RESET);
+    d = SPI_ReceiveData8(spi);
+    return d ;
+}
+
+void SPIClass::attachInterrupt(void) {
+	// Should be enableInterrupt()
+}
+
+void SPIClass::detachInterrupt(void) {
+	// Should be disableInterrupt()
+}
+
+