gpio.c

00001 #include "gpio.h"
00002 #include "main.h"
00003 #include "stm32f4xx_rcc_mort.h"
00004 
00005 
00006 /* Below are defined Address of Port F and corresponding registers*/
00007 #define PORTF_BASE_ADDRESS ((uint32_t)0x40021400)
00008 #define PORTF_MODER_REGISTER (PORTF_BASE_ADDRESS + 0x00)
00009 #define PORTF_OTYPER_REGISTER (PORTF_BASE_ADDRESS + 0x04)
00010 #define PORTF_OSPEEDR_REGISTER (PORTF_BASE_ADDRESS + 0x08)
00011 #define PORTF_PUPDR_REGISTER (PORTF_BASE_ADDRESS + 0x0C)
00012 #define PORTF_IDR_REGISTER (PORTF_BASE_ADDRESS + 0x10)
00013 #define PORTF_ODR_REGISTER (PORTF_BASE_ADDRESS + 0x14)
00014 #define PORTF_AFR1_REGISTER (PORTF_BASE_ADDRESS + 0x20)
00015 
00016 /* Below are defined Address of Port B and corresponding registers*/
00017 #define PORTB_BASE_ADDRESS              ((uint32_t)0x40020400)
00018 #define PORTB_MODER_REGISTER            (PORTB_BASE_ADDRESS + 0x00)
00019 #define PORTB_OTYPER_REGISTER           (PORTB_BASE_ADDRESS + 0x04)
00020 #define PORTB_OSPEEDR_REGISTER          (PORTB_BASE_ADDRESS + 0x08)
00021 #define PORTB_PUPDR_REGISTER            (PORTB_BASE_ADDRESS + 0x0C)
00022 #define PORTB_IDR_REGISTER              (PORTB_BASE_ADDRESS + 0x10)
00023 #define PORTB_ODR_REGISTER              (PORTB_BASE_ADDRESS + 0x14)
00024 #define PORTB_AFR1_REGISTER             (PORTB_BASE_ADDRESS + 0x20)
00025 
00026 
00027 
00028 void InitPortFPin7asAnalog(void)
00029 {
00030     uint32_t *reg; /*Define Pointer*/
00031     RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOF, ENABLE); /* Enable the clock */
00032     
00033     reg = (uint32_t *)PORTF_MODER_REGISTER;
00034     *reg = *reg & (~((uint32_t)(0x03<<14))); /*Clear bits 14 & 15 of Moder Register*/
00035     *reg = *reg | (uint32_t)(0x03<<14); /* Set the bits 14 & 15 as 11 - Analog Output Mode */
00036     
00037     reg = (uint32_t *)PORTF_OTYPER_REGISTER;
00038     *reg = *reg & (~((uint32_t)(0x01<<7))); /* Statement is to set the OTYPER REGISTER of Pin 7 TO 0 - Push Pull Type */
00039 
00040     
00041     reg = (uint32_t *)PORTF_PUPDR_REGISTER;
00042     *reg = *reg & (~((uint32_t)(0x03<<14))); /* Statement is to set the PUPDR REGISTER TO 00 - No Pull Up No Pull Down Type*/
00043 
00044 }
00045 
00046 void InitPortFPin7Pin8Pin9asAnalog(void)
00047 {
00048     uint32_t *reg; /*Define Pointer*/
00049     RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOF, ENABLE); /* Enable the clock */
00050     
00051     reg = (uint32_t *)PORTF_MODER_REGISTER;
00052     *reg = *reg & (~((uint32_t)(0x03<<14))+ (uint32_t)(0x03<<16) + (uint32_t)(0x03<<18)); /*Clear bits 14, 15, 16, 17, 18, 19 of Moder Register*/
00053     *reg = *reg | ((uint32_t)(0x03<<14) + (uint32_t)(0x03<<16) + (uint32_t)(0x03<<18)); /* Set the bits 14, 15, 16, 17, 18, 19 as 11 - Analog Output Mode */
00054     
00055     reg = (uint32_t *)PORTF_OTYPER_REGISTER;
00056     *reg = *reg & (~((uint32_t)(0x01<<7)+ (uint32_t)(0x01<<8) + (uint32_t)(0x01<<9))); /* Statement is to set the OTYPER REGISTER of Pin 7, 8, 9 TO 0 - Push Pull Type */
00057 
00058     
00059     reg = (uint32_t *)PORTF_PUPDR_REGISTER;
00060     *reg = *reg & (~((uint32_t)(0x03<<14)+ (uint32_t)(0x03<<16) + (uint32_t)(0x03<<18) )); /* Statement is to set the PUPDR REGISTER OF PIN 7,8,9 TO 00 - No Pull Up No Pull Down Type*/
00061 
00062 }
00063 
00064 
00065 void InitPortBPin0asOutput(void)
00066 {
00067     uint32_t *reg; /*Define Pointer*/
00068     RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE); /* Enable the clock */
00069     
00070     reg = (uint32_t *)PORTB_MODER_REGISTER;
00071     *reg = *reg & (~((uint32_t)0x03)); /*Clear last two bits of Moder Register*/
00072     *reg = *reg | ((uint32_t)0x01); /* Set the last two pins corresponding to Pin0 as Output Mode - 01 */
00073     
00074     reg = (uint32_t *)PORTB_OTYPER_REGISTER;
00075     *reg = *reg & (~((uint32_t)0x01)); /* Clear the last bit of OTYPER REGISTER*/
00076     *reg = *reg | ((uint32_t)0x00);/*Statement is to set the OTYPER REGISTER TO 0 - Push Pull Type*/
00077     
00078     reg = (uint32_t *)PORTB_PUPDR_REGISTER;
00079     *reg = *reg & (~((uint32_t)0x03)); /* Clear the last two bits of PUPDR REGISTER*/
00080     *reg = *reg | ((uint32_t)0x00);/*Statement is to set the PUPDR REGISTER TO 00 - No Pull Up No Pull Down Type*/
00081     
00082     reg=(uint32_t *)PORTB_OSPEEDR_REGISTER;
00083     *reg=*reg&(~((uint32_t)0x11)); /* Clear the last two bits of OSPEEDR REGISTER*/
00084     *reg=*reg|((uint32_t)0x11); /* Set the last two bits of OSPEEDR REGISTER to High Speed*/
00085     
00086     reg = (uint32_t *)PORTB_ODR_REGISTER;
00087     *reg = *reg | ((uint32_t)0x01); /* Setting the ODR REGISTER TO HIGH TO START WITH - Last bit is 1*/
00088 }
00089 
00090 
00091 
00092 void toggleGPIOB0(void)
00093 {
00094     uint32_t value;
00095     uint32_t *reg; /* Defining the variables*/
00096     
00097     reg = (uint32_t *)PORTB_ODR_REGISTER; /*Initializing the current value of ODR REGISTER*/
00098     value = *reg & ((uint32_t)0x1); /* Reading the value of last bit of current ODR REGISTER - Stored in reg*/
00099     
00100     if (value > 0)
00101     {
00102         /* The bit is high initially*/
00103         /*Need to set it to low now*/
00104         *reg = *reg & (~((uint32_t)0x1));
00105     }
00106     
00107     else
00108     {
00109         /* The bit is low initially*/
00110         /* Need to set it to high now*/
00111         *reg = *reg | ((uint32_t)0x01);
00112     }
00113 }
00114 
00115 
00116 
00117 
00118