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

[Kinsey Moore (@opticron)]

Kinsey Moore started a new discussion on bsps/arm/stm32f4/spi/spi.c: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1294#note_152387

 > +/*
 > + * Internal bus context.  The spi_bus base member must be first so that
 > + * RTEMS_CONTAINER_OF produces the correct pointer when the framework
 > + * calls our callbacks with a spi_bus *.
 > + */
 > +typedef struct {
 > +  spi_bus               base;
 > +  volatile stm32f4_spi *regs;
 > +  rtems_vector_number   irq;
 > +  stm32f4_rcc_index     rcc_index;
 > +  uint32_t              pclk_hz;
 > +  rtems_binary_semaphore sem;
 > +  /* Current transfer state, updated by the ISR */
 > +  const uint8_t        *tx_buf;
 > +  uint8_t              *rx_buf;
 > +  size_t                todo;  /* bytes still to receive */

This could use a better name. Perhaps `rx_bytes_remaining`?

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1294#note_152387
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