STM32_MDMA_CBNDTR_BNDT_MASK
residue += cbndtr & STM32_MDMA_CBNDTR_BNDT_MASK;
state->in_flight_bytes = cbndtr & STM32_MDMA_CBNDTR_BNDT_MASK;
#define STM32_MDMA_CBNDTR_BNDT(n) FIELD_PREP(STM32_MDMA_CBNDTR_BNDT_MASK, (n))
STM32_MDMA_CBNDTR_BNDT_MASK);
STM32_MDMA_CBNDTR_BRSUM | STM32_MDMA_CBNDTR_BNDT_MASK);