Hi to all,
I'm dealing with SPI interface in slave mode and I am experience some problem in communication.
I am using a ST32F030 MCU and I enabled RXNEIE interrupt for receiving data. Hereafter is the code:
CONFIGURATION
RCC->APB2ENR |= RCC_APB2ENR_SPI1EN; // Enable SPI1 clock
SPI1->CR1 = 0x0000; // Disable and reset SPI
SPI1->CR1 |= 0x02<<3; // Bidirectional | Slave | CPOL = 0 | CPHA = 0
SPI1->CR2 = 0x0700; // Reset CR2
SPI1->CR2 |= SPI_CR2_FRXTH | 0x07<<8 | SPI_CR2_RXNEIE; // RX full = 1/4 (8bit) | 8 bit | enable RXNE interrupt
SPI1->CR1 |= SPI_CR1_SPE; // Enable SPI
INTERRUPT
uint16_t spi1cnt = 0;
extern "C" void SPI1_IRQHandler()
{
uint8_t c, *k;
k = (uint8_t *) &(SPI1->DR); // consider register as 8 bit
if ((SPI1->SR & SPI_SR_RXNE) == SPI_SR_RXNE)
{
c = *k; // Store received byte
SPI1->DR = (uint8_t) spi1cnt; // Send a number sequence
if(spi1cnt < MAXBUF - 10)
{
spibuf[spi1cnt++] = c;
spibuf[spi1cnt] = 0;
}
else
{
spibuf[spi1cnt] = 0;
spi1cnt = 0;
}
}
else print("ERROR");
return;
}
Here is what I received
2 0 3 0 6 0 7 0 10 0 11 should be 2 3 4 5 6 7 8 9 10 11 12
0 14 0 15 0 18 0 19 0 22 0 should be 12 14 15 16 17 18 19 20 21 22 23
23 0 26 0 27 0 30 0 0 0 3 should be 24 25 26 27 28 29 30 0 1 2 3
0 4 0 7 0 8 0 11 0 12 0
0 16 0 19 0 20 0 23 0 24
Do I forgot something in configuration?
I checked on scope all signals and they changed their state (I can check only one channel per time).
Any hint?
Thank you
Freya
