Posted on July 03, 2014 at 21:58
Hi,
I am trying to generate the SPI signal using the STM32L152D-EVAL. Supposedly it should be very straight forward, but for some reasons the code just never pass the conditional statement:
while (SPI_I2S_GetFlagStatus(SPI2, SPI_I2S_FLAG_TXE) == RESET);
Can anyone tell me what I am missing? By the way, I am using SPI2 and its SCLK, MOSI, and MISO, signals are on PB13, PB14, and PB15
#include ''stm32l1xx.h''
#include ''stm32l1xx_gpio.h''
#include ''stm32l1xx_spi.h''
GPIO_InitTypeDef GPIO_InitStructure;
SPI_InitTypeDef SPI_InitStructure;
static void SPI_Config(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB1Periph_SPI2, ENABLE);
/* Enable SCK, MOSI and MISO GPIO clocks */
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOB , ENABLE);
GPIO_PinAFConfig(GPIOB, GPIO_PinSource13, GPIO_AF_SPI2);
GPIO_PinAFConfig(GPIOB, GPIO_PinSource15, GPIO_AF_SPI2);
GPIO_PinAFConfig(GPIOB, GPIO_PinSource14, GPIO_AF_SPI2);
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_40MHz;
/* SPI SCK pin configuration */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13|GPIO_Pin_15|GPIO_Pin_14;
GPIO_Init(GPIOB, &GPIO_InitStructure);
/* SPI configuration -------------------------------------------------------*/
SPI_I2S_DeInit(SPI2);
SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low;
SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge;
SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_2;
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
SPI_Init(SPI2, &SPI_InitStructure);
}
int main(void)
{
SPI_Config();
/* Enable the SPI peripheral */
SPI_Cmd(SPI2, ENABLE);
while(1)
{
while (SPI_I2S_GetFlagStatus(SPI2, SPI_I2S_FLAG_TXE) == RESET);
SPI_I2S_SendData(SPI2, 0xAA);
}
}
