I am trying to establish SPI communication from master to slave. I am able to send bytes over to slave, and is now trying to send when the TX interrupt is triggered.
Below is code I used for master side, on STM32F103;
void spi_init() {
GPIO_InitTypeDef GPIO_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
SPI_InitTypeDef SPI_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2, ENABLE);
NVIC_InitStructure.NVIC_IRQChannel = SPI2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13 | GPIO_Pin_15;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_14;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOB, &GPIO_InitStructure);
SPI_I2S_DeInit(SPI2);
SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
SPI_InitStructure.SPI_CPOL = SPI_CPOL_High;
SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;
SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_4;
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
SPI_Init(SPI2, &SPI_InitStructure);
SPI_Cmd(SPI2, ENABLE);
SPI_CalculateCRC(SPI2, DISABLE);
SPI_SSOutputCmd(SPI2, DISABLE);
SPI_I2S_ITConfig(SPI2, SPI_I2S_IT_RXNE, ENABLE);
SPI_I2S_ITConfig(SPI2, SPI_I2S_IT_TXE, ENABLE);
}
void SPI2_IRQHandler(void) {
if (SPI_I2S_GetITStatus(SPI2, SPI_I2S_IT_TXE) == SET) {
//Send from buffer
SPI_I2S_ClearITPendingBit(SPI2, SPI_I2S_IT_TXE);
}
if (SPI_I2S_GetITStatus(SPI2, SPI_I2S_IT_RXNE) == SET) {
//Receive
SPI_I2S_ClearITPendingBit(SPI2, SPI_I2S_IT_RXNE);
}
}
The problem is that the program always crashes within the spi_init() function. When I comment out either the NVIC_Init command and the SPI_I2S_ITConfig(SPI2, SPI_I2S_IT_TXE, ENABLE) command, it will not crash. But it will just not work with the two together.
Any help on what is causing the problem is appreciated.