Posted on September 17, 2011 at 14:55Hi.
I am a student and i must do a project with the STM32L-Discovery using SPI.
I found this code:
/**
* @brief Changes the mapping of the specified pin.
* @param
GPIOx: where x can be (A, B, C, D, E or H) to select the GPIO peripheral. * @param GPIO_PinSource: specifies the pin for the Alternate function.
* This parameter can be GPIO_PinSourcex where x can be (0..15).
* @param GPIO_AFSelection: selects the pin to used as Alternat function.
* This parameter can be one of the following values:
* @arg GPIO_AF_RTC_50Hz: RTC 50/60 Hz synchronization
* @arg GPIO_AF_MCO: Microcontroller clock output
* @arg GPIO_AF_RTC_AF1: Time stamp, Tamper, Alarm A out, Alarm B out,
* 512 Hz clock output (with an LSE oscillator of 32.768 kHz)
* @arg GPIO_AF_WKUP: wakeup
* @arg GPIO_AF_SWJ: SWJ (SW and JTAG)
* @arg GPIO_AF_TRACE
* @arg GPIO_AF_TIM2
* @arg GPIO_AF_TIM3
* @arg GPIO_AF_TIM4
* @arg GPIO_AF_TIM9
* @arg GPIO_AF_TIM10
* @arg GPIO_AF_TIM11
* @arg GPIO_AF_I2C1
* @arg GPIO_AF_I2C2
* @arg GPIO_AF_SPI1
* @arg GPIO_AF_SPI2
* @arg GPIO_AF_USART1
* @arg GPIO_AF_USART2
* @arg GPIO_AF_USART3
* @arg GPIO_AF_USB
* @arg GPIO_AF_LCD
* @arg GPIO_AF_RI
* @arg GPIO_AF_EVENTOUT: Cortex-M3 EVENTOUT signal
* @note: The pin should already been configured in Alternate Function mode(AF)
* using GPIO_InitStruct->GPIO_Mode = GPIO_Mode_AF
* @note: Please refer to the Alternate function mapping table in the device
* datasheet for the detailed mapping of the system and peripherals�
* alternate function I/O pins.
* @note: EVENTOUT is not mapped on PH0, PH1 and PH2.
* @retval None
*/
void GPIO_PinAFConfig(GPIO_TypeDef* GPIOx, uint16_t GPIO_PinSource, uint8_t GPIO_AF)
{
uint32_t temp = 0x00;
uint32_t temp_2 = 0x00;
/* Check the parameters */
assert_param(IS_GPIO_ALL_PERIPH(GPIOx));
assert_param(IS_GPIO_PIN_SOURCE(GPIO_PinSource));
assert_param(IS_GPIO_AF(GPIO_AF));
temp = ((uint32_t)(GPIO_AF) << ((uint32_t)((uint32_t)GPIO_PinSource & (uint32_t)0x07) * 4)) ;
GPIOx->AFR[GPIO_PinSource >> 0x03] &= ~((uint32_t)0xF << ((uint32_t)((uint32_t)GPIO_PinSource & (uint32_t)0x07) * 4)) ;
temp_2 = GPIOx->AFR[GPIO_PinSource >> 0x03] | temp;
GPIOx->AFR[GPIO_PinSource >> 0x03] = temp_2;
}
but i don't know which GPIO peripheral are A, B, C, D, E and H. I have looked it up in the serveral doc, but i didn't find it.
Can someone tell me which GPIO peripheral represent A, B, C, D, E and H?
Thanks
#stm32l-discovery
