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Code Issues Wiki Activity

Define and use DISCARD

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This commit is contained in:
jflyper 2019-01-21 04:59:21 +09:00
parent 35ade68bb3
commit f96508ceec
2 changed files with 5 additions and 3 deletions
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4
src/main/common/utils.h
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@ -55,9 +55,11 @@
#define PP_CALL(macro, ...) macro(__VA_ARGS__)
#if !defined(UNUSED)
#define UNUSED(x) (void)(x)
#define UNUSED(x) (void)(x) // Variables and parameters that are not used
#endif
#define DISCARD(x) (void)(x) // To explicitly ignore result of x (usually an I/O register access).
#define STATIC_ASSERT(condition, name) _Static_assert((condition), #name)

4
src/main/drivers/bus_spi_stdperiph.c
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@ -113,7 +113,7 @@ uint8_t spiTransferByte(SPI_TypeDef *instance, uint8_t txByte)
{
uint16_t spiTimeout = 1000;
instance->DR;
DISCARD(instance->DR);
while (SPI_I2S_GetFlagStatus(instance, SPI_I2S_FLAG_TXE) == RESET)
if ((spiTimeout--) == 0)
@ -154,7 +154,7 @@ bool spiTransfer(SPI_TypeDef *instance, const uint8_t *txData, uint8_t *rxData,
uint16_t spiTimeout = 1000;
uint8_t b;
instance->DR;
DISCARD(instance->DR);
while (len--) {
b = txData ? *(txData++) : 0xFF;
while (SPI_I2S_GetFlagStatus(instance, SPI_I2S_FLAG_TXE) == RESET) {