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Show/hide line numbers gpio.c Source File

gpio.c

00001 #include "gpio.h"
00002 #include "main_Lec9.h"
00003 #include "stm32f4xx_rcc_mort.h"
00004 
00005 
00006 /* Below are defined Address of Port B and corresponding registers*/
00007 #define PORTB_BASE_ADDRESS ((uint32_t)0x40020400)
00008 #define PORTB_MODER_REGISTER (PORTB_BASE_ADDRESS + 0x00)
00009 #define PORTB_OTYPER_REGISTER (PORTB_BASE_ADDRESS + 0x04)
00010 #define PORTB_OSPEEDR_REGISTER (PORTB_BASE_ADDRESS + 0x08)
00011 #define PORTB_PUPDR_REGISTER (PORTB_BASE_ADDRESS + 0x0C)
00012 #define PORTB_IDR_REGISTER (PORTB_BASE_ADDRESS + 0x10)
00013 #define PORTB_ODR_REGISTER (PORTB_BASE_ADDRESS + 0x14)
00014 #define PORTB_AFR1_REGISTER (PORTB_BASE_ADDRESS + 0x20)
00015 
00016 /* Below are defined Address of Port C and corresponding registers*/
00017 #define PORTC_BASE_ADDRESS ((uint32_t)0x40020800)
00018 #define PORTC_MODER_REGISTER (PORTC_BASE_ADDRESS + 0x00)
00019 #define PORTC_OTYPER_REGISTER (PORTC_BASE_ADDRESS + 0x04)
00020 #define PORTC_OSPEEDR_REGISTER (PORTC_BASE_ADDRESS + 0x08)
00021 #define PORTC_PUPDR_REGISTER (PORTC_BASE_ADDRESS + 0x0C)
00022 #define PORTC_IDR_REGISTER (PORTC_BASE_ADDRESS + 0x10)
00023 #define PORTC_ODR_REGISTER (PORTC_BASE_ADDRESS + 0x14)
00024 #define PORTC_AFR1_REGISTER (PORTC_BASE_ADDRESS + 0x20)
00025 
00026 void InitPortBPin0asOutput(void)
00027 {
00028     uint32_t *reg; /*Define Pointer*/
00029     RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE); /* Enable the clock */
00030     
00031     reg = (uint32_t *)PORTB_MODER_REGISTER;
00032     *reg = *reg & (~((uint32_t)0x03)); /*Clear last two bits of Moder Register*/
00033     *reg = *reg | ((uint32_t)0x01); /* Set the last two pins corresponding to Pin0 as Output Mode - 01 */
00034     
00035     reg = (uint32_t *)PORTB_OTYPER_REGISTER;
00036     *reg = *reg & (~((uint32_t)0x01)); /* Clear the last bit of OTYPER REGISTER*/
00037     *reg = *reg | ((uint32_t)0x00);/*Statement is to set the OTYPER REGISTER TO 0 - Push Pull Type*/
00038     
00039     reg = (uint32_t *)PORTB_PUPDR_REGISTER;
00040     *reg = *reg & (~((uint32_t)0x03)); /* Clear the last two bits of PUPDR REGISTER*/
00041     *reg = *reg | ((uint32_t)0x00);/*Statement is to set the PUPDR REGISTER TO 00 - No Pull Up No Pull Down Type*/
00042     
00043     //reg=(uint32_t *)PORTB_OSPEEDR_REGISTER;
00044     //*reg=*reg&(~((uint32_t)0x11)); /* Clear the last two bits of OSPEEDR REGISTER*/
00045     //*reg=*reg|((uint32_t)0x11); /* Set the last two bits of OSPEEDR REGISTER to High Speed*/
00046     
00047     reg = (uint32_t *)PORTB_ODR_REGISTER;
00048     *reg = *reg | ((uint32_t)0x01); /* Setting the ODR REGISTER TO HIGH TO START WITH - Last bit is 1*/
00049 }
00050 
00051 
00052 
00053 void toggleGPIOB0(void)
00054 {
00055     uint32_t value;
00056     uint32_t *reg; /* Defining the variables*/
00057     
00058     reg = (uint32_t *)PORTB_ODR_REGISTER; /*Initializing the current value of ODR REGISTER*/
00059     value = *reg & ((uint32_t)0x1); /* Reading the value of last bit of current ODR REGISTER - Stored in reg*/
00060     
00061     if (value > 0)
00062     {
00063         /* The bit is high initially*/
00064         /*Need to set it to low now*/
00065         *reg = *reg & (~((uint32_t)0x1));
00066     }
00067     
00068     else
00069     {
00070         /* The bit is low initially*/
00071         /* Need to set it to high now*/
00072         *reg = *reg | ((uint32_t)0x01);
00073     }
00074 }
00075 
00076 
00077 
00078 
00079 void InitGPIOBPin0asOutputCompare(void)
00080 {
00081     uint32_t *reg; //Initialize register pointer variable
00082     
00083     RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE); /* Enable the clock */
00084     
00085     reg = (uint32_t *)PORTB_MODER_REGISTER;
00086     *reg = *reg & (~((uint32_t)0x03)); //Clear last two bits of MODER REGISTER
00087     *reg = *reg | ((uint32_t)0b10); //Write 10 to last two bits of MODER REGISTER
00088     
00089     reg = (uint32_t *)PORTB_OTYPER_REGISTER;
00090     *reg = *reg & (~((uint32_t)0x01)); //Clear last bit of OTYPER REGISTER
00091     *reg = *reg | ((uint32_t)0x00); //Setting 0 to last bit of OTYPER REGISTER
00092     
00093     reg = (uint32_t *)PORTB_PUPDR_REGISTER;
00094     *reg = *reg & (~((uint32_t)0x03)); //Clear last two bits of PUPDR REGISTER - NO PULL UP/DOWN
00095     
00096     //reg = (uint32_t *)PORTB_OSPEEDR_REGISTER;
00097     //*reg = *reg & (~((uint32_t)0x03)); //Clear last two bits of OSPEEDR REGISTER
00098     //*reg = *reg | ((uint32_t)0x03); //Setting of 11 to last two bits of OSPEEDR REGISTER - HIGH SPEED
00099     
00100     reg = (uint32_t *)PORTB_AFR1_REGISTER;
00101     *reg = *reg & (~((uint32_t)0xF)); //Clear last four bits of AFRL0 - GPIOB_AFRL REGISTER
00102     *reg=*reg|((uint32_t)0x2); //Set last four digits of AFRL0 to 0010 - AF2 Alternate Function
00103 }
00104 
00105 
00106 
00107 void InitGPIOCPin6asInputCapture(void)
00108 {
00109     uint32_t *reg; //Initialize register pointer variable
00110     RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC, ENABLE); /* Enable the clock */
00111     
00112     reg = (uint32_t *)PORTC_MODER_REGISTER;
00113     *reg = *reg & (~((uint32_t)0x3000)); //Clear last two bits of MODER REGISTER
00114     *reg = *reg | ((uint32_t)0x2000); //Write 10 to last two bits of MODER REGISTER
00115     
00116     reg = (uint32_t *)PORTC_OTYPER_REGISTER;
00117     *reg = *reg & (~((uint32_t)0x40)); //Clear last bit of OTYPER REGISTER
00118     *reg = *reg | ((uint32_t)0x00); //Setting 0 to last bit of OTYPER REGISTER
00119     
00120     reg = (uint32_t *)PORTC_OSPEEDR_REGISTER;
00121     *reg = *reg & (~((uint32_t)0x3000)); //Clear last two bits of OSPEEDR REGISTER
00122     *reg = *reg | ((uint32_t)0x3000); //Setting of 11 to last two bits of OSPEEDR REGISTER - HIGH SPEED
00123     
00124     reg = (uint32_t *)PORTC_PUPDR_REGISTER;
00125     *reg = *reg & (~((uint32_t)0x3000)); //Clear last two bits of PUPDR REGISTER - NO PULL UP/DOWN
00126     *reg = *reg | 0x00; //Setting two bits of PUPDR REGISTER - NO PULL UP/DOWN
00127     
00128     reg = (uint32_t *)PORTC_AFR1_REGISTER;
00129     *reg= *reg & (~((uint32_t)0xF000000)); //Clear last four bits of AFRL0 - GPIOB_AFRL REGISTER
00130     *reg= *reg | ((uint32_t)0x2000000); //Set last four digits of AFRL0 to 0010 - AF2 Alternate Function
00131 }
00132 
00133 void InitGPIOBPin0asPWMMode1(void)
00134 {
00135     uint32_t *reg; //Initialize register pointer variable
00136     
00137     RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE); /* Enable the clock */
00138     
00139     reg = (uint32_t *)PORTB_MODER_REGISTER;
00140     *reg = *reg & (~((uint32_t)0x03)); //Clear last two bits of MODER REGISTER
00141     *reg = *reg | ((uint32_t)0b10); //Write 10 to last two bits of MODER REGISTER
00142     
00143     reg = (uint32_t *)PORTB_OTYPER_REGISTER;
00144     *reg = *reg & (~((uint32_t)0x01)); //Clear last bit of OTYPER REGISTER
00145     *reg = *reg | ((uint32_t)0x00); //Setting 0 to last bit of OTYPER REGISTER
00146     
00147     reg = (uint32_t *)PORTB_PUPDR_REGISTER;
00148     *reg = *reg & (~((uint32_t)0x03)); //Clear last two bits of PUPDR REGISTER - NO PULL UP/DOWN
00149     
00150     reg = (uint32_t *)PORTB_OSPEEDR_REGISTER;
00151     *reg = *reg & (~((uint32_t)0x03)); //Clear last two bits of OSPEEDR REGISTER
00152     *reg = *reg | ((uint32_t)0x03); //Setting of 11 to last two bits of OSPEEDR REGISTER - HIGH SPEED
00153     
00154     reg = (uint32_t *)PORTB_AFR1_REGISTER;
00155     *reg = *reg & (~((uint32_t)0xF)); //Clear last four bits of AFRL0 - GPIOB_AFRL REGISTER
00156     *reg=*reg|((uint32_t)0x2); //Set last four digits of AFRL0 to 0010 - AF2 Alternate Function
00157 }
00158 
00159 void setGPIOB0( void )
00160 {
00161     uint32_t * reg;
00162     reg = (uint32_t *)PORTB_ODR_REGISTER;
00163     *reg = *reg | 0b01; 
00164 }
00165 
00166 void clearGPIOB0( void )
00167 {
00168     uint32_t * reg;
00169     reg = (uint32_t *)PORTB_ODR_REGISTER;
00170     *reg = *reg & (~(uint32_t)0b01); 
00171 }
00172 
00173 void initGpioC6AsInput( void )
00174 {
00175     uint32_t * reg; 
00176  /* GPIOC Peripheral clock enable */
00177     RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC, ENABLE);
00178  /* GPIOC Pin 6 as input*/
00179     reg = (uint32_t *)PORTC_MODER_REGISTER;
00180     *reg = *reg & (~((uint32_t)0x3000));
00181     *reg= *reg | 0x0000;
00182  /*PUSH-PULL Pin*/
00183     reg = (uint32_t *)PORTC_OTYPER_REGISTER;
00184     *reg = *reg & (~((uint32_t)0x40));
00185     *reg = *reg | 0x00;
00186  /*GPIOC pin 6 high speed */
00187     reg = (uint32_t *)PORTC_OSPEEDR_REGISTER;
00188     *reg= *reg| 0x3000;
00189  /*Configure pulled-down*/
00190     reg = (uint32_t *)PORTC_PUPDR_REGISTER;
00191     *reg = *reg & (~((uint32_t)0x3000));
00192     *reg= *reg | 0x2000;
00193 }
00194
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