CBR1_BNDT
#define STM32_DMA3_MAX_BLOCK_SIZE ALIGN_DOWN(CBR1_BNDT, 64)
u32 bndt = FIELD_GET(CBR1_BNDT, cbr1);
hwdesc->cbr1 = FIELD_PREP(CBR1_BNDT, len);
*residue += FIELD_GET(CBR1_BNDT, swdesc->lli[i].hwdesc->cbr1);
bndt = FIELD_GET(CBR1_BNDT, cbr1);
int bytes_read = FIELD_GET(CBR1_BNDT, hwdesc->cbr1) - bndt;