added SPI driver

1brahimmohamed · Nov 4, 2022 · 70fc043 · 70fc043
1 parent f639654
commit 70fc043
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diff --git a/SPI/.cproject b/SPI/.cproject
@@ -0,0 +1,115 @@
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diff --git a/SPI/.project b/SPI/.project
@@ -0,0 +1,27 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>SPI</name>
+	<comment></comment>
+	<projects>
+	</projects>
+	<buildSpec>
+		<buildCommand>
+			<name>org.eclipse.cdt.managedbuilder.core.genmakebuilder</name>
+			<triggers>clean,full,incremental,</triggers>
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+		<buildCommand>
+			<name>org.eclipse.cdt.managedbuilder.core.ScannerConfigBuilder</name>
+			<triggers>full,incremental,</triggers>
+			<arguments>
+			</arguments>
+		</buildCommand>
+	</buildSpec>
+	<natures>
+		<nature>org.eclipse.cdt.core.cnature</nature>
+		<nature>org.eclipse.cdt.managedbuilder.core.managedBuildNature</nature>
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+		<nature>de.innot.avreclipse.core.avrnature</nature>
+	</natures>
+</projectDescription>
diff --git a/SPI/.settings/de.innot.avreclipse.core.prefs b/SPI/.settings/de.innot.avreclipse.core.prefs
@@ -0,0 +1,7 @@
+avrtarget/ClockFrequency=1000000
+avrtarget/ExtRAMSize=0
+avrtarget/ExtendedRAM=false
+avrtarget/MCUType=atmega32
+avrtarget/UseEEPROM=false
+avrtarget/UseExtendedRAMforHeap=true
+eclipse.preferences.version=1
diff --git a/SPI/.settings/org.eclipse.core.resources.prefs b/SPI/.settings/org.eclipse.core.resources.prefs
@@ -0,0 +1,2 @@
+eclipse.preferences.version=1
+encoding/<project>=UTF-8
diff --git a/UART/src/common_macros.h → SPI/src/common_macros.h b/UART/src/common_macros.h → SPI/src/common_macros.h
diff --git a/UART/src/gpio.c → SPI/src/gpio.c b/UART/src/gpio.c → SPI/src/gpio.c
diff --git a/UART/src/gpio.h → SPI/src/gpio.h b/UART/src/gpio.h → SPI/src/gpio.h
diff --git a/SPI/src/spi.c b/SPI/src/spi.c
@@ -0,0 +1,144 @@
+ /******************************************************************************
+ *
+ * Module: SPI
+ * File Name: spi.c
+ * Description: Source file for the SPI AVR driver
+ * Author: Ibrahim Mohamed
+ *
+ *******************************************************************************/
+
+#include "spi.h"
+#include "gpio.h" /* To Setup the SPI pins direction */
+#include "common_macros.h" /* To use the macros like SET_BIT */
+#include "avr/io.h" /* To use the SPI Registers */
+
+/*******************************************************************************
+ *                      Functions Definitions                                  *
+ *******************************************************************************/
+
+/*
+ * Description :
+ * Initialize the SPI device as Master.
+ */
+void SPI_initMaster(void) 
+{
+	/******** Configure SPI Master Pins *********
+	 * SS(PB4)   --> Output
+	 * MOSI(PB5) --> Output 
+	 * MISO(PB6) --> Input
+	 * SCK(PB7) --> Output
+	 ********************************************/
+	GPIO_setupPinDirection(PORTB_ID,PIN4_ID,PIN_OUTPUT);
+	GPIO_setupPinDirection(PORTB_ID,PIN5_ID,PIN_OUTPUT);
+	GPIO_setupPinDirection(PORTB_ID,PIN6_ID,PIN_INPUT);
+	GPIO_setupPinDirection(PORTB_ID,PIN7_ID,PIN_OUTPUT);
+
+    /************************** SPCR Description **************************
+     * SPIE    = 0 Disable SPI Interrupt
+     * SPE     = 1 Enable SPI Driver
+     * DORD    = 0 Transmit the MSB first
+     * MSTR    = 1 Enable Master
+     * CPOL    = 0 SCK is low when idle
+     * CPHA    = 0 Sample Data with the raising edge
+     * SPR1:0  = 00 Choose SPI clock = Fosc/4
+     ***********************************************************************/
+	SPCR = (1<<SPE) | (1<<MSTR);
+
+	/* Clear the SPI2X bit in SPSR to Choose SPI clock = Fosc/4 */
+	SPSR &= ~(1<<SPI2X);
+}
+
+/*
+ * Description :
+ * Initialize the SPI device as Slave.
+ */
+void SPI_initSlave(void)
+{ 
+	/******** Configure SPI Slave Pins *********
+	 * SS(PB4)   --> Input
+	 * MOSI(PB5) --> Input
+	 * MISO(PB6) --> Output
+	 * SCK(PB7) --> Input
+	 ********************************************/
+	GPIO_setupPinDirection(PORTB_ID,PIN4_ID,PIN_INPUT);
+	GPIO_setupPinDirection(PORTB_ID,PIN5_ID,PIN_INPUT);
+	GPIO_setupPinDirection(PORTB_ID,PIN6_ID,PIN_OUTPUT);
+	GPIO_setupPinDirection(PORTB_ID,PIN7_ID,PIN_INPUT);
+
+	/************************** SPCR Description **************************
+	 * SPIE    = 0 Disable SPI Interrupt
+	 * SPE     = 1 Enable SPI Driver
+	 * DORD    = 0 Transmit the MSB first
+	 * MSTR    = 0 Disable Master
+	 * CPOL    = 0 SCK is low when idle
+	 * CPHA    = 0 Sample Data with the raising edge
+	 * SPR1:0  = 00 Choose SPI clock = Fosc/4
+	 ***********************************************************************/
+	SPCR = (1<<SPE);
+
+	/* Clear the SPI2X bit in SPSR to Choose SPI clock = Fosc/4 */
+	SPSR &= ~(1<<SPI2X);
+}
+
+/*
+ * Description :
+ * Send the required data through SPI to the other SPI device.
+ * In the same time data will be received from the other device.
+ */
+uint8 SPI_sendReceiveByte(uint8 data)
+{
+	/* Initiate the communication and send data by SPI */
+	SPDR = data;
+
+	/* Wait until SPI interrupt flag SPIF = 1 (data has been sent/received correctly) */
+	while(BIT_IS_CLEAR(SPSR,SPIF)){}
+
+	/*
+	 * Note: SPIF flag is cleared by first reading SPSR (with SPIF set) which is done in the previous step.
+	 * and then accessing SPDR like the below line.
+	 */
+	return SPDR;
+}
+
+/*
+ * Description :
+ * Send the required string through SPI to the other SPI device.
+ */
+void SPI_sendString(const uint8 *str)
+{
+	uint8 i = 0;
+	uint8 received_data = 0;
+
+	/* Send the whole string */
+	while(str[i] != '\0')
+	{
+		/*
+		 * received_data contains the received data from the other device.
+		 * It is a dummy data variable as we just need to send the string to other device.
+		 */
+		received_data = SPI_sendReceiveByte(str[i]);
+		i++;
+	}
+}
+
+/*
+ * Description :
+ * Receive the required string until the '#' symbol through SPI from the other SPI device.
+ */
+void SPI_receiveString(uint8 *str)
+{
+	uint8 i = 0;
+
+	/* Receive the first byte */
+	str[i] = SPI_sendReceiveByte(SPI_DEFAULT_DATA_VALUE);
+
+	/* Receive the whole string until the '#' */
+	while(str[i] != '#')
+	{
+		i++;
+		str[i] = SPI_sendReceiveByte(SPI_DEFAULT_DATA_VALUE);
+	}
+
+	/* After receiving the whole string plus the '#', replace the '#' with '\0' */
+	str[i] = '\0';
+}
Original file line number	Diff line number	Diff line change
		@@ -0,0 +1,2 @@
		eclipse.preferences.version=1
		encoding/<project>=UTF-8