Posted on April 09, 2014 at 11:11Hello,
I'm trying to configure SPI1 with NSS software management in my STM32F100, because I want to manage NSS pin as a generic IO pin. Is this possible?
For example, I've configured my NSS pin as a generic open-drain
and I connected it to 3v3 by a pull-up resistor, but the signal at the pin is always low.
This's my configuration:
// Enable GPIO clock
RCC_APB2PeriphClockCmd( SPI_SCK_GPIO_CLK |
SPI_MISO_GPIO_CLK |
SPI_MOSI_GPIO_CLK |
SPI_NSS_GPIO_CLK |
RCC_APB2Periph_AFIO,
ENABLE);
// Enable SPI clock
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI, ENABLE);
GPIO_InitStructure.GPIO_Pin = SPI_SCK_PIN | SPI_MOSI_PIN;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(SPI_SCK_GPIO_PORT, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = SPI_MISO_PIN;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(SPI_MISO_GPIO_PORT, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = SPI_NSS_PIN;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_OD;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(NSS_GPIO_PORT, &GPIO_InitStructure);
Thanks in advance
#stm32 #spi
