STM32_MDMA_MAX_BUF_LEN
if (len <= STM32_MDMA_MAX_BUF_LEN) {
tlen = STM32_MDMA_MAX_BUF_LEN;
STM32_MDMA_CTCR_TLEN((STM32_MDMA_MAX_BUF_LEN - 1));
tlen = STM32_MDMA_MAX_BUF_LEN;
STM32_MDMA_MAX_BUF_LEN);
dst_maxburst = STM32_MDMA_MAX_BUF_LEN / dst_addr_width;
src_maxburst = STM32_MDMA_MAX_BUF_LEN / src_addr_width;
STM32_MDMA_MAX_BUF_LEN);
src_maxburst = STM32_MDMA_MAX_BUF_LEN / src_addr_width;
dst_maxburst = STM32_MDMA_MAX_BUF_LEN / dst_addr_width;