RTEMS | Add the support for i2c driver in the aarch64/raspberrypi bsp (!363)

[Shaunak Datar (@skdatar)]

Shaunak Datar commented on a discussion on bsps/aarch64/raspberrypi/i2c/raspberrypi-i2c.c: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/363#note_122800

 > +  raspberrypi_bsc_masters device;
 > +  uintptr_t               remaining_bytes;
 > +  uintptr_t               remaining_transfers;
 > +  uint8_t                *current_buffer;
 > +  uintptr_t               current_buffer_size;
 > +  bool                    read_transfer;
 > +} raspberrypi_i2c_bus;
 > +
 > +static int i2c_polling_read( raspberrypi_i2c_bus *bus )
 > +{
 > +  while ( !( S_REG( bus ) & S_DONE ) && ( bus->remaining_bytes > 0 ) ) {
 > +    while ( ( S_REG( bus ) & S_RXD ) && ( bus->remaining_bytes > 0 ) ) {
 > +      *bus->current_buffer = BCM2835_REG(
 > +                               bus->base_address + BCM2711_I2C_FIFO
 > +                             ) &
 > +                             0xFF;

Yes that is a mask to get the 8bits from the fifo

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/363#note_122800
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