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stm32:peripherals:gpio_input [2016/06/07 07:03] – feurstm32:peripherals:gpio_input [2022/12/28 08:15] (current) – ruan
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 \\ {{gpio_input.svg}} \\ \\ \\ {{gpio_input.svg}} \\ \\
  
-===== Programming Example =====+===== Programming Instructions =====
  
-The code snippet bellow shows how to configure and use a GPIO pin as input.+==== Enable Peripheral ====
  
-<code c> +Make sure the peripheral is enabled: 
-#include "reg_stm32f4xx.h"+  * Enable GPIOx in ''RCC->AHBENR[0]''.
  
-RCC->AHBENR[0] |= (0x1 << 0u);    /* Enable GPIOA clock */+==== Setup input mode ====
  
-/* Configure GPIO pin A.10 as input. */ +Configure the MODE and PUPDR register, for every pin that should act as digital input: 
-GPIOA->MODER &= ~(0x3 << 20u);    /* Clear existing mode bits 20 and 21. */ +  * Write ''0x00'' to the corresponding fields in ''GPIOx->MODE''. 
- +  * Configure pull-up / -down in ''GPIOx->PUPDR''.
-GPIOA->PUPDR &= ~(0x3 << 20u);    /* Clear existing pull-up/-down bits 20 and 21. */ +
-GPIOA->PUPDR |= (0x1 << 20u);     /* Set pin 10 to pull-up mode. */ +
- +
-/* Read from GPIO pin A.10. */ +
-uint32_t data = GPIOA->IDR;       /* Read the input data register. */ +
-</code> +
-\\ +
- +
-> {{logo_hal.svg?72px |}} **Hardware Abstraction Layer** +
-> [[https://ennis.zhaw.ch/hal/structreg__gpio__t.html | Registry Types]] +
-> [[https://ennis.zhaw.ch/hal/hal__gpio_8h.html | InES GPIO HAL Interface]]+
 \\ \\
  
 ===== Configuration Registers ===== ===== Configuration Registers =====
  
-==== MODER ==== +==== GPIOx_MODER - GPIO port mode register ====
- +
-Mode register+
  
 \\ {{gpio_reg_common.svg}} \\ \\ \\ {{gpio_reg_common.svg}} \\ \\
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 |Pin x|00|Input mode (reset state)| |Pin x|00|Input mode (reset state)|
  
-==== PUPDR ==== +==== GPIOx_PUPDR - GPIO port pull-up / pull-down register ====
- +
-Push-up / pull-down register+
  
 \\ {{gpio_reg_common.svg}} \\ \\ \\ {{gpio_reg_common.svg}} \\ \\
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 ===== Data Registers ===== ===== Data Registers =====
  
-==== IDR ==== +==== GPIOx_IDR - Port input data register ====
- +
-Input data register+
  
 \\ {{gpio_reg_idr.svg}} \\ \\ \\ {{gpio_reg_idr.svg}} \\ \\
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 * Register is read only \\ \\ * Register is read only \\ \\
  
-===== Legend ===== 
- 
-\\ {{legende.svg}} \\ \\ 
  • stm32/peripherals/gpio_input.1465283025.txt.gz
  • Last modified: 2016/06/07 07:03
  • by feur