GPIO - arduino pin mapping for STM32F769I-discovery?

benyBoy · ‎2017-04-23

Posted on April 24, 2017 at 06:35

Hi , I have succesfuly managed to merge the GPIO example code into my project.

I am using the audio application project as the base project.

The GPIO button toggles the LED.

I would like to define 3 GPIO pins as digital ouputs on the arduino headers of the STM32F769I-discovery board

so far I have code below, but can't find the arduino pin : GPIO pin map ?

can arduino pins GPIO ? or should I be doing this a different way ? I just need to toggle 3 pins high and low.

static void EXTI0_GPIO_BEN(void)

{

GPIO_InitTypeDef GPIO_InitStructure;

/* Enable GPIOC clock */

__HAL_RCC_GPIOA_CLK_ENABLE();

// configure gpio pins for reset for external adc dsp and dac devices

// gpio reset for ADC

GPIO_InitStructure.Mode = GPIO_MODE_OUTPUT_PP;

GPIO_InitStructure.Pull = GPIO_NOPULL; // no pullup or pull dowm resistors ?

GPIO_InitStructure.Pin = GPIO_PIN_0;

// gpio reset for DSP

GPIO_InitStructure.Mode = GPIO_MODE_OUTPUT_PP;

GPIO_InitStructure.Pull = GPIO_NOPULL; // no pullup or pull dowm resistors ?

GPIO_InitStructure.Pin = GPIO_PIN_1;

// gpio reset for DAC

GPIO_InitStructure.Mode = GPIO_MODE_OUTPUT_PP;

GPIO_InitStructure.Pull = GPIO_NOPULL; // no pullup or pull dowm resistors ?

GPIO_InitStructure.Pin = GPIO_PIN_1;

HAL_GPIO_Init(GPIOA, &GPIO_InitStructure); /// go initilize pins ?

// i don't think I need to have interrupts for this ??

/* Enable and set EXTI line 0 Interrupt to the lowest priority */

// HAL_NVIC_SetPriority(EXTI0_IRQn, 2, 0);

// HAL_NVIC_EnableIRQ(EXTI0_IRQn);

}

waclawek.jan · ‎2017-04-24

Posted on April 24, 2017 at 10:50

so far I have code below, but can't find the arduino pin : GPIO pin map ?

UM2033 Table 13 and Fig.33

JW

benyBoy · ‎2017-04-24

Posted on April 24, 2017 at 11:43

,

Hi waclawek,

I looked at table 13 but cannot see how it relates to GPIO pin definition in example GPIO code.

for example which physical pin in table 13 is GPIO_PIN_0 , ?

GPIO_InitStructure.Pin = GPIO_PIN_0,

from the table,

pin number , , , , , , pin name , , , , , label , , , , , , , , , , , , , , , , , , , , , comment

C2 , , , , , , , , , , , , , , , , , , , , PI8 , , , , , , , , , , , GPIO_Input , , , , , , , , , NC4

from GPIO example,

/** @defgroup GPIO_pins_define GPIO pins define

,

, * @{

,

, */

,

♯ define GPIO_PIN_0 , , , , , , , , , , , , , , , , ((uint16_t)0x0001U) , /* Pin 0 selected , , , */

,

♯ define GPIO_PIN_1 , , , , , , , , , , , , , , , , ((uint16_t)0x0002U) , /* Pin 1 selected , , , */

,

♯ define GPIO_PIN_2 , , , , , , , , , , , , , , , , ((uint16_t)0x0004U) , /* Pin 2 selected , , , */

,

♯ define GPIO_PIN_3 , , , , , , , , , , , , , , , , ((uint16_t)0x0008U) , /* Pin 3 selected , , , */

,

♯ define GPIO_PIN_4 , , , , , , , , , , , , , , , , ((uint16_t)0x0010U) , /* Pin 4 selected , , , */

,

♯ define GPIO_PIN_5 , , , , , , , , , , , , , , , , ((uint16_t)0x0020U) , /* Pin 5 selected , , , */

,

♯ define GPIO_PIN_6 , , , , , , , , , , , , , , , , ((uint16_t)0x0040U) , /* Pin 6 selected , , , */

,

♯ define GPIO_PIN_7 , , , , , , , , , , , , , , , , ((uint16_t)0x0080U) , /* Pin 7 selected , , , */

,

♯ define GPIO_PIN_8 , , , , , , , , , , , , , , , , ((uint16_t)0x0100U) , /* Pin 8 selected , , , */

,

♯ define GPIO_PIN_9 , , , , , , , , , , , , , , , , ((uint16_t)0x0200U) , /* Pin 9 selected , , , */

,

♯ define GPIO_PIN_10 , , , , , , , , , , , , , , , ((uint16_t)0x0400U) , /* Pin 10 selected , , */

,

♯ define GPIO_PIN_11 , , , , , , , , , , , , , , , ((uint16_t)0x0800U) , /* Pin 11 selected , , */

,

♯ define GPIO_PIN_12 , , , , , , , , , , , , , , , ((uint16_t)0x1000U) , /* Pin 12 selected , , */

,

♯ define GPIO_PIN_13 , , , , , , , , , , , , , , , ((uint16_t)0x2000U) , /* Pin 13 selected , , */

,

♯ define GPIO_PIN_14 , , , , , , , , , , , , , , , ((uint16_t)0x4000U) , /* Pin 14 selected , , */

,

♯ define GPIO_PIN_15 , , , , , , , , , , , , , , , ((uint16_t)0x8000U) , /* Pin 15 selected , , */

,

♯ define GPIO_PIN_All , , , , , , , , , , , , , , ((uint16_t)0xFFFFU) , /* All pins selected */

♯ define GPIO_PIN_MASK , , , , , , , , , , , , , ((uint32_t)0x0000FFFFU) /* PIN mask for assert test */

,

/**

,

, * @}

,

, */

waclawek.jan · ‎2017-04-24

Posted on April 24, 2017 at 12:38

In Tab13, search for lines where in Comment the name starts with ARD_. Fig.33 may be more comprehensive.

I am not going comment on the example code and 'libraries'.

JW

john doe · ‎2017-04-24

Posted on April 24, 2017 at 14:53

Your code in your first post shows how to initialize a gpio pin.

The relevant files are stm32f7xx_hal_gpio.h and stm32f7xx_hal_gpio.c

Its just a connector on a board. there is no arduino gpio api in the HAL.

benyBoy · ‎2017-04-24

Posted on April 24, 2017 at 13:29

Thanks Waclawek , helpful

still don't know how to define a GPIO pin though. I should have guessed ARD was Arduino !

Maybe it would help if I knew the hardware address of say ARD_D0 ? Then I could work backwards

through the libraries / code to see the relationship.

Anyone know where I can find that information ?

does GPIO_PIN_0 or hardware address 0x0001 = ARD_D0 ?

maybe i'm looking for the hardware address of ARD_D0 , ARD_D1 etc

AndyJT · ‎2017-04-24

Posted on April 24, 2017 at 14:59

I'd maybe forget about looking for and usingthe BSP defines, you have the info you need on the schematic

ARD_D0 is shown as PC7

To use that as an output you have to enable the GPIO clock for GPIO C and init the pin(s) as so:

GPIO_InitTypeDef GPIO_InitStructure;
__HAL_RCC_GPIOC_CLK_ENABLE();
GPIO_InitStructure.Pin = GPIO_PIN_6 | GPIO_PIN_7 | GPIO_PIN_8;
GPIO_InitStructure.Mode = GPIO_MODE_OUTPUT_OD; //GPIO_MODE_OUTPUT_PP; // ;GPIO_MODE_OUTPUT_OD
GPIO_InitStructure.Speed = GPIO_SPEED_FREQ_HIGH;
GPIO_InitStructure.Pull = GPIO_NOPULL; // GPIO_PULLDOWN;
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(I've also defined PC6 and PC8 as outputs above)

If you wanted to use the pins as part of a peripheral like I2C / SPI then you need to look at the examplesin the _msp files. These are where the GPIO is configuredvia callback from the HAL eg, within HAL_I2C_Init()

void HAL_I2C_MspInit(I2C_HandleTypeDef *hi2c)
{
 GPIO_InitTypeDef GPIO_InitStruct;
.
.
 /* Enable DMAx clock */
 I2Cx_DMA_CLK_ENABLE(); 
 
 /*##-3- Configure peripheral GPIO ##########################################*/ 
 /* I2C TX GPIO pin configuration */
 GPIO_InitStruct.Pin = I2Cx_SCL_PIN;
 GPIO_InitStruct.Mode = GPIO_MODE_AF_OD;
 GPIO_InitStruct.Pull = GPIO_PULLUP;
 GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
 GPIO_InitStruct.Alternate = I2Cx_SCL_SDA_AF;
 HAL_GPIO_Init(I2Cx_SCL_GPIO_PORT, &GPIO_InitStruct);
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In this case, the I/O is #defined in a Board Support header file somewhere... when writing your own projects, I would recommend putting all the I/O setup in one place and replacing the #defines with actual pin numbers so you can see what's going on a bit easier.

egI2Cx_SCL_PIN might be GPIO_PIN_8 andI2Cx_SCL_GPIO_PORT might be GPIOBfor the processor you're using

AvaTar · ‎2017-04-24

Posted on April 24, 2017 at 15:40

Maybe it would help if I knew the hardware address of say ARD_D0 ? Then I could work backwards through the libraries / code to see the relationship.

Anyone know where I can find that information ?

does GPIO_PIN_0 or hardware address 0x0001 = ARD_D0 ?

maybe i'm looking for the hardware address of ARD_D0 , ARD_D1 etc

'ARD_D0' is just an arbitrary name for a signal/connection in the schematics.

Down to the right of your image, at CN13, you see an instance of ARD_D0, and directly to the left, 'PC7'.

This PC7 is the actual GPIO pin of the MCU used to provide that 'ARD_D0' functionality.

You will find the pin name PC7 in the usual documents (as Jan suggested).

With time and experience, you gonna get use to read schematics.

benyBoy · ‎2017-04-24

Posted on April 24, 2017 at 16:27

thank for this, so I can use these as digital output if I initialise them as such ?

PC02 = GPIO_PIN_2 = ARD_A2 ( arduino anlouge pin 2 )

PC06 = GPIO_PIN_6 = ARD_D1 ( arduino digital pin 1 )

PC07 = GPIO_PIN_7 = ARD_D0 ( arduino digital pin 0 )

PC08 = GPIO_PIN_8 = ARD_D5 ( arduino digital pin 5 )

are there any other physical GPIO pins available as digital outputs on the STM32F769I-discovery ?

what does PCx , PFx , PAx etc stand for ?

benyBoy · ‎2017-04-24

Posted on April 24, 2017 at 19:03

I took a look at stm32f7xx_hal_gpio.c and came up with...

HAL_GPIO_WritePin(GPIOA, 7,1); // GPIO_PIN_6 , ARD_D0 HIGH

HAL_Delay(500);

HAL_GPIO_WritePin(GPIOA, 7,0); // GPIO_PIN_6 , ARD_D0 LOW

HAL_Delay(500);

HAL_GPIO_WritePin(GPIOA, 7,1); // GPIO_PIN_6 , ARD_D0 HIGH

HAL_Delay(500);

Will try it now and report back here if it works.

I noticed HAL_GPIO_TogglePin() but thought I'd try WritePin first.

I'm not really sure what GPIOA is doing and having a guess 0 is off and 1 is on !