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STM: SPI: Initialize Rx in spi_master_write 

In case Rx is not initiliased its content might be random from stack.
This is causing problem in case of 8 bits read only as the left-side 8 bits
of the returned int value may contain this random byte data. This was for
instance detected when using SDFileSystem Lib.
pull/3540/head
Laurent MEUNIER 2017-01-06 13:20:55 +01:00
parent e7361ebc44
commit fd3a3f9de8
1 changed files with 2 additions and 1 deletions
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3
targets/TARGET_STM/stm_spi_api.c
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@ -344,7 +344,8 @@ static inline int ssp_busy(spi_t *obj)
int spi_master_write(spi_t *obj, int value) int spi_master_write(spi_t *obj, int value)
{ {
uint16_t size, Rx, ret; uint16_t size, ret;
int Rx = 0;
struct spi_s *spiobj = SPI_S(obj); struct spi_s *spiobj = SPI_S(obj);
SPI_HandleTypeDef *handle = &(spiobj->handle); SPI_HandleTypeDef *handle = &(spiobj->handle);