Hi,
I try my first programming on an STM32 Discovery Board (STM32F303). I
was using avrs before for years :-)
First step should be to get the SPI to work. My IDE is Eclipse with gnu
arm eclipse-plugin.
All I want to see for now is the working SPI on an oscilloscope.
But the following code shows nothing at CLK or MOSI:
int main(int argc, char* argv[])
{
BlinkLed blinkLed;
GPIO_InitTypeDef GPIO_InitStructure;
SPI_InitTypeDef SPI_InitStructure;
blinkLed.powerUp();
RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2, ENABLE);
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOB, ENABLE);
// PB13 = SCK; PB15 = MOSI
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13 | GPIO_Pin_15;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);
GPIO_PinAFConfig(GPIOB, GPIO_PinSource13, GPIO_AF_6);
GPIO_PinAFConfig(GPIOB, GPIO_PinSource15, GPIO_AF_6);
// Chip select pin
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);
GPIO_SetBits(GPIOB, GPIO_Pin_8);
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_256;
SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;
SPI_InitStructure.SPI_CPOL = SPI_CPOL_High;
SPI_InitStructure.SPI_CRCPolynomial = 1;
SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
SPI_InitStructure.SPI_Direction = SPI_Direction_1Line_Tx;
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
SPI_Init(SPI2, &SPI_InitStructure);
SPI_Cmd(SPI2, ENABLE);
uint8_t i = 0;
while (1)
{
i++;
blinkLed.turnOff();
SPI_SendData8(SPI2, i);
while (SPI_I2S_GetFlagStatus(SPI2, SPI_I2S_FLAG_BSY) == SET)
{};
blinkLed.turnOn();
}
} |
Is there any bus or clock I didn't switch on?
Trouble with the TX-FiFos? Must I use the TX-Interrupt?
I inspected the code with the debugger - it cycles correctly through the
while-loop...
Any help would be appreciated. Thank you.
Watch this topic
Disable multi-page view