RTEMS | bsps/arm/stm32f4: Add SPI bus driver (!1294)

[Moksh Panicker (@mokshpanicker)]

Moksh Panicker commented on a discussion on bsps/arm/stm32f4/spi/spi.c: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1294#note_152109

 > + * a single byte.  One byte is therefore in flight at a time: TXE fires
 > + * when DR is empty and we write the next TX byte; RXNE fires when a
 > + * received byte is available and we read it.  When all bytes have been
 > + * received we wake the blocked task.  DMA would eliminate the per-byte
 > + * interrupt overhead but is not implemented in this initial version.
 > + */
 > +static void stm32f4_spi_isr(void *arg)
 > +{
 > +  stm32f4_spi_bus      *bus  = arg;
 > +  volatile stm32f4_spi *regs = bus->regs;
 > +  uint32_t              sr   = regs->sr;
 > +
 > +  if (sr & STM32F4_SPI_SR_TXE) {
 > +    uint8_t byte = 0;
 > +    if (bus->tx_buf != NULL) {
 > +      byte = *bus->tx_buf++;

Done, split into two lines throughout.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1294#note_152109
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