diff options
Diffstat (limited to 'libmaple/dma.c')
| -rw-r--r-- | libmaple/dma.c | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/libmaple/dma.c b/libmaple/dma.c index 6442e4d..d13de10 100644 --- a/libmaple/dma.c +++ b/libmaple/dma.c @@ -33,6 +33,8 @@ */ #include <libmaple/dma.h> +#include "dma_private.h" +#include "stm32_private.h" /* * Convenience routines @@ -45,3 +47,36 @@ void dma_init(dma_dev *dev) { rcc_clk_enable(dev->clk_id); } + +/* + * Private API + */ + +enum dma_atype _dma_addr_type(__io void *addr) { + switch (stm32_block_purpose((void*)addr)) { + /* Notice we're treating the code block as memory here. That's + * correct for addresses in Flash and in [0x0, 0x7FFFFFF] + * (provided that those addresses are aliased to Flash, SRAM, or + * FSMC, depending on BOOT[01] and possibly SYSCFG_MEMRMP). It's + * not correct for other addresses in the code block, but those + * will (hopefully) just fail-fast with transfer or bus errors. If + * lots of people get confused, it might be worth being more + * careful here. */ + case STM32_BLOCK_CODE: /* Fall through */ + case STM32_BLOCK_SRAM: /* ... */ + case STM32_BLOCK_FSMC_1_2: /* ... */ + case STM32_BLOCK_FSMC_3_4: + return DMA_ATYPE_MEM; + case STM32_BLOCK_PERIPH: + return DMA_ATYPE_PER; + case STM32_BLOCK_FSMC_REG: /* Fall through */ + /* Is this right? I can't think of a reason to DMA into or out + * of the FSMC registers. [mbolivar] */ + case STM32_BLOCK_UNUSED: /* ... */ + case STM32_BLOCK_CORTEX_INTERNAL: /* ... */ + return DMA_ATYPE_OTHER; + default: + ASSERT(0); /* Can't happen */ + return DMA_ATYPE_OTHER; + } +} |