CTR1_SBL_1
#define STM32_DMA3_MAX_BURST_LEN (1 + min_t(u32, FIELD_MAX(CTR1_SBL_1), \
_ctr1 |= FIELD_PREP(CTR1_SBL_1, sbl_max - 1);
_ctr1 |= FIELD_PREP(CTR1_SBL_1, sbl_max - 1);
_ctr1 |= FIELD_PREP(CTR1_SBL_1, sbl_max - 1);