fix(SPI): avoid 0 delay when SPI clock > 1MHz

jchen-dawnscene · fpistm · fpistm · commit 462c518c9b08 · 2023-11-14T11:05:04.000+01:00
Fixes stm32duino#2181. Signed-off-by: Jidong Chen <123861172+jchen-dawnscene@users.noreply.github.com> Co-Authored-By: Frederic Pillon <frederic.pillon@st.com>
diff --git a/libraries/SPI/src/utility/spi_com.c b/libraries/SPI/src/utility/spi_com.c
@@ -214,7 +214,7 @@ static uint32_t compute_disable_delay(spi_t *obj)
   SPI_HandleTypeDef *handle = &(obj->handle);
 
   prescaler = 1 << ((handle->Init.BaudRatePrescaler >> SPI_CFG1_MBR_Pos) + 1);
-  disable_delay = ((prescaler * 1000000) / spi_freq) / 2;
+  disable_delay = (((prescaler * 1000000) / spi_freq) / 2) + 1;
   return disable_delay;
 }
 #endif

Original file line number	Diff line number	Diff line change
`@@ -214,7 +214,7 @@ static uint32_t compute_disable_delay(spi_t *obj)`
`214`	`214`	`SPI_HandleTypeDef *handle = &(obj->handle);`
`215`	`215`
`216`	`216`	`prescaler = 1 << ((handle->Init.BaudRatePrescaler >> SPI_CFG1_MBR_Pos) + 1);`
`217`		`- disable_delay = ((prescaler * 1000000) / spi_freq) / 2;`
	`217`	`+ disable_delay = (((prescaler * 1000000) / spi_freq) / 2) + 1;`
`218`	`218`	`return disable_delay;`
`219`	`219`	`}`
`220`	`220`	`#endif`