Posted on September 09, 2017 at 16:52
Hi.
I'd like to test UART in STM32F429-DISCO kit, and I buy UART to USB board
But I don't know what pins are using in UART test with .STM32F4xx_DSP_StdPeriph_Lib_V1.8.0
Could you please let me know which pins should I have to connect between
STM32F429-DISCO kit and UART
to
USB
board ?
Posted on September 09, 2017 at 17:51
,
,
Thanks for letting me know that.
Currently I'm referring en.DM00071990.pdf There is some information about ,STM32F429xx.
and ,STM32F4xx_DSP_StdPeriph_Lib_V1.8.0 USART example code.
But there is no connection information. ,
Might be you are saying this
I'm actually confused that manual saying USART1_TX : PA9, PB6 , and USART1_RX: PA10, PB7.
How am I supposed to know which pin is used for USART1 TX,RX.
Even the example code does not use alternate mode. how do we know which function does it use after reset.
What I mean is for example PB6's function is defined as TIM4_CH1, I2C1_SCL, USART1_TX,CAN2_TX...
Here 's example code of USART, I can't see the any information of alternate mode.
/**
,
******************************************************************************,
* @file USART/USART_Printf/main.c,
* @author MCD Application Team,
* @version V1.8.0,
* @date 04-November-2016,
* @brief Main program body,
******************************************************************************,
* @attention,
*,
* <,h2>,<,center>,&,copy, COPYRIGHT 2016 STMicroelectronics<,/center>,<,/h2>,,
*,
* Licensed under MCD-ST Liberty SW License Agreement V2, (the ''License''),,
* You may not use this file except in compliance with the License.,
* You may obtain a copy of the License at:,
*,
*
,
*,
* Unless required by applicable law or agreed to in writing, software,
* distributed under the License is distributed on an ''AS IS'' BASIS,,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.,
* See the License for the specific language governing permissions and,
* limitations under the License.,
*,
******************************************************************************,
*//* Includes ------------------------------------------------------------------*/
,
♯ include ''main.h''/** @addtogroup STM32F4xx_StdPeriph_Examples
,
* @{,
*//** @addtogroup USART_Printf
,
* @{,
*//* Private typedef -----------------------------------------------------------*/
,
/* Private define ------------------------------------------------------------*/,
/* Private macro -------------------------------------------------------------*/,
/* Private variables ---------------------------------------------------------*/,
/* Private function prototypes -----------------------------------------------*/,
static void USART_Config(void),♯ ifdef __GNUC__
,
/* With GCC/RAISONANCE, small printf (option LD Linker->,Libraries->,Small printf,
set to 'Yes') calls __io_putchar() */,
♯ define PUTCHAR_PROTOTYPE int __io_putchar(int ch),
♯ else,
♯ define PUTCHAR_PROTOTYPE int fputc(int ch, FILE *f),
♯ endif /* __GNUC__ */,
,
/* Private functions ---------------------------------------------------------*//**
,
* @brief Main program,
* @param None,
* @retval None,
*/,
int main(void),
{,
/*!<, At this stage the microcontroller clock setting is already configured,,
this is done through SystemInit() function which is called from startup,
files (startup_stm32f40_41xxx.s/startup_stm32f427_437xx.s/startup_stm32f429_439xx.s),
before to branch to application main.,
To reconfigure the default setting of SystemInit() function, refer to,
system_stm32f4xx.c file.,
*//* USART configuration */
,
USART_Config(),,
,
/* Output a message on Hyperterminal using printf function */,
printf(''\n\rUSART Printf Example: retarget the C library printf function to the USART\n\r''),while (1)
,
{,
},
}/**
,
* @brief Configures the USART Peripheral.,
* @param None,
* @retval None,
*/,
static void USART_Config(void),
{,
USART_InitTypeDef USART_InitStructure,,
,
/* USARTx configured as follows:,
- BaudRate = 115200 baud,
- Word Length = 8 Bits,
- One Stop Bit,
- No parity,
- Hardware flow control disabled (RTS and CTS signals),
- Receive and transmit enabled,
*/,
USART_InitStructure.USART_BaudRate = 115200,,
USART_InitStructure.USART_WordLength = USART_WordLength_8b,,
USART_InitStructure.USART_StopBits = USART_StopBits_1,,
USART_InitStructure.USART_Parity = USART_Parity_No,,
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None,,
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx,STM_EVAL_COMInit(COM1, &,USART_InitStructure),
,
}/**
,
* @brief Retargets the C library printf function to the USART.,
* @param None,
* @retval None,
*/,
PUTCHAR_PROTOTYPE,
{,
/* Place your implementation of fputc here */,
/* e.g. write a character to the USART */,
USART_SendData(EVAL_COM1, (uint8_t) ch),/* Loop until the end of transmission */
,
while (USART_GetFlagStatus(EVAL_COM1, USART_FLAG_TC) == RESET),
{}return ch,
,
}♯ ifdef USE_FULL_ASSERT
/**
,
* @brief Reports the name of the source file and the source line number,
* where the assert_param error has occurred.,
* @param file: pointer to the source file name,
* @param line: assert_param error line source number,
* @retval None,
*/,
void assert_failed(uint8_t* file, uint32_t line),
{,
/* User can add his own implementation to report the file name and line number,,
ex: printf(''Wrong parameters value: file %s on line %d\r\n'', file, line) *//* Infinite loop */
,
while (1),
{,
},
},
♯ endif/**
,
* @},
*//**
,
* @},
*//************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
Posted on September 11, 2017 at 04:51
I'm confused that how does GPIO_AFRL[31:0] register exactly do as AFRLx and trying to understand alternate function as AFRL as the image below.
for example If I set GPIOA_AFRL = 0x
0000_
0000_
0000_
0000_
0000_0000_0111_0100,Then what happens?
I can't understand the relationship between left and right image at the below.
I can't see the Information of ''
The pin via GPIO_Init(), the function via GPIO_AFConfig()'',
Especially,
void GPIO_Init(GPIO_TypeDef* GPIOx, GPIO_InitTypeDef* GPIO_InitStruct)
{ uint32_t pinpos = 0x00, pos = 0x00 , currentpin = 0x00;/* Check the parameters */
assert_param(IS_GPIO_ALL_PERIPH(GPIOx)); assert_param(IS_GPIO_PIN(GPIO_InitStruct->GPIO_Pin)); assert_param(IS_GPIO_MODE(GPIO_InitStruct->GPIO_Mode)); assert_param(IS_GPIO_PUPD(GPIO_InitStruct->GPIO_PuPd));/* ------------------------- Configure the port pins ---------------- */
/*-- GPIO Mode Configuration --*/ for (pinpos = 0x00; pinpos < 0x10; pinpos++) { pos = ((uint32_t)0x01) << pinpos; /* Get the port pins position */ currentpin = (GPIO_InitStruct->GPIO_Pin) & pos;if (currentpin == pos)
{ GPIOx->MODER &= ~(GPIO_MODER_MODER0 << (pinpos * 2)); GPIOx->MODER |= (((uint32_t)GPIO_InitStruct->GPIO_Mode) << (pinpos * 2));if ((GPIO_InitStruct->GPIO_Mode == GPIO_Mode_OUT) || (GPIO_InitStruct->GPIO_Mode == GPIO_Mode_AF))
{ /* Check Speed mode parameters */ assert_param(IS_GPIO_SPEED(GPIO_InitStruct->GPIO_Speed));/* Speed mode configuration */
GPIOx->OSPEEDR &= ~(GPIO_OSPEEDER_OSPEEDR0 << (pinpos * 2)); GPIOx->OSPEEDR |= ((uint32_t)(GPIO_InitStruct->GPIO_Speed) << (pinpos * 2));/* Check Output mode parameters */
assert_param(IS_GPIO_OTYPE(GPIO_InitStruct->GPIO_OType));/* Output mode configuration*/
GPIOx->OTYPER &= ~((GPIO_OTYPER_OT_0) << ((uint16_t)pinpos)) ; GPIOx->OTYPER |= (uint16_t)(((uint16_t)GPIO_InitStruct->GPIO_OType) << ((uint16_t)pinpos)); }/* Pull-up Pull down resistor configuration*/
GPIOx->PUPDR &= ~(GPIO_PUPDR_PUPDR0 << ((uint16_t)pinpos * 2)); GPIOx->PUPDR |= (((uint32_t)GPIO_InitStruct->GPIO_PuPd) << (pinpos * 2)); } }}there's nowhere GPIO_PinAFConfig function especially in that example project.
I think it means that there is no setting about
AFConfigure.
