SWO pin

[mahmoud boroumand]

Posted on July 17, 2017 at 12:37

Hey

I'm using stm32f103c8 and I want to use all of the GPIOB .it work good expect pin 3 and 4.Those pin use for sys_njtrst and sys_jtdo-tracswo but i just use SW and i don't need these pins for programming  and want to use for other purpose but its not work.can i do that?is it possible to use for input or output purpose?

[Vangelis Fortounas]

Posted on July 17, 2017 at 13:01

Hello!

You must remap theese pin's function by use AF

for example

GPIO_InitTypeDef GPIO_InitStruct;
//GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
//GPIO_InitStruct.Mode = GPIO_MODE_AF_OD;
GPIO_InitStruct.Mode = GPIO_MODE_AF_INPUT;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_MEDIUM;
GPIO_InitStruct.Pin = GPIO_PIN_2; 
HAL_GPIO_Init(GPIO_B, &GPIO_InitStruct);�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?
 �?

[mahmoud boroumand]

Posted on July 17, 2017 at 15:18

hey thanks for your help.

can you explain more?Because it's not work

[Vangelis Fortounas]

Posted on July 17, 2017 at 16:12

Hello again

what you mean when you say 'is not work'?

I suppose that you use HAL drivers.

A very simple example for PB3 as push-pull GPIO Output:

//initialisation
__HAL_RCC_GPIOB_CLK_ENABLE();
GPIO_InitTypeDef GPIO_InitStruct;
GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
GPIO_InitStruct.Pin = GPIO_PIN_3;
HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);�?�?�?�?�?�?
�?�?�?�?�?�?�?

After initialize it you can use it as output :

//Set output level
HAL_GPIO_WritePin(GPIOB, GPIO_PIN_3, GPIO_PIN_SET);// Output is HI�?�?

or

HAL_GPIO_WritePin(GPIOB, GPIO_PIN_3, GPIO_PIN_RESET);// Output is Low �?

Read also the STM32F103x8 DataSheet for details about pins and remaps of functions.

[mahmoud boroumand]

Posted on July 18, 2017 at 06:06

hello

♯ define WS2812B_PINS (GPIO_Pin_0 | GPIO_Pin_1 | GPIO_Pin_2 | GPIO_Pin_3|GPIO_Pin_4 | GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7|GPIO_Pin_8 | GPIO_Pin_9 | GPIO_Pin_10 | GPIO_Pin_11|GPIO_Pin_12 | GPIO_Pin_13 | GPIO_Pin_14 | GPIO_Pin_15)

GPIO_InitStructure.GPIO_Pin = WS2812B_PINS;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

GPIO_Init(GPIOB, &GPIO_InitStructure);

DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&WS2812B_PORT->ODR;

DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)framedata;

DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;

DMA_InitStructure.DMA_BufferSize = BUFFER_SIZE;

DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;

DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;

DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Word;

DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;

DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;

DMA_InitStructure.DMA_Priority = DMA_Priority_High;

DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;

DMA_Init(DMA1_Channel5, &DMA_InitStructure);

This is my code for config gpio AND I use DMA .all of pin work well expect 

GPIO_Pin_3|GPIO_Pin_4.

can you tell me what's wrong in my code?

thanks

[Vangelis Fortounas]

Posted on July 18, 2017 at 09:48

Hello!

After GPIO_Init  function add

RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);

GPIO_PinRemapConfig(GPIO_Remap_SWJ_NoJTRST, ENABLE);

GPIO_PinRemapConfig(GPIO_Remap_SWJ_JTAGDisable, ENABLE);

[mahmoud boroumand]

Posted on July 22, 2017 at 08:16

Thanks