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| author | Josh Rahm <joshuarahm@gmail.com> | 2020-11-18 22:46:11 -0700 |
|---|---|---|
| committer | Josh Rahm <joshuarahm@gmail.com> | 2020-11-18 22:46:11 -0700 |
| commit | 75f8523f3a70558788186f8f2d7ca5a6f9f71194 (patch) | |
| tree | ccadcf76b602c91d840eb287d8d6fb423c8f19e8 /02-usart/include/common.h | |
| parent | c1405b06d98b9b227fa7ff53c158f31d745eb505 (diff) | |
| download | stm32l4-75f8523f3a70558788186f8f2d7ca5a6f9f71194.tar.gz stm32l4-75f8523f3a70558788186f8f2d7ca5a6f9f71194.tar.bz2 stm32l4-75f8523f3a70558788186f8f2d7ca5a6f9f71194.zip | |
Change dma.h over to a regset() strategy.
Apparently people really don't like bitfields in practice,
so I have devised a compromise to retain some readability while
using bitmasks instead by writing a regset() macro.
Diffstat (limited to '02-usart/include/common.h')
| -rw-r--r-- | 02-usart/include/common.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/02-usart/include/common.h b/02-usart/include/common.h index f9cbe06..394dc62 100644 --- a/02-usart/include/common.h +++ b/02-usart/include/common.h @@ -17,6 +17,8 @@ #define __IO volatile #endif +#define CTZ(n) __builtin_ctz(n) + #define bool int #ifndef __cplusplus #define true 1 @@ -39,4 +41,7 @@ typedef __IO uint32_t bits_t; +#define regset(reg, mask, val) \ + (reg = (reg & ~mask) | (val << CTZ(mask))) + #endif /* COMMON_H */ |