stm32 使用sdio控制sd卡方式和中断+dma方式做sd读卡器-the stm32 use sdio control a sd card and interrupt+dma way to do the sd card reader

This files are stm32f10x libs.(ad, da, dma, usart, spi, sdio, i2c, timer, exti, etc...)-This files are stm32f10x libs.(ad, da, dma, usart, spi, sdio, i2c, timer, exti, etc...)

Macro to check if DMA buffer is WORD-aligned and DMA-able. Most host controllers assume the buffer is DMA able and will bug-check otherwise (i.e. buffers on the stack). virt_addr_valid check fails on stack memory.