[HAL][KSDK] Fix issue with KSDK SPI timing

Sissors · Sissors · commit fa63b6703f6f · 2015-05-03T17:37:16.000+02:00
Depending on the format by default the Freescale SPI peripheral does not
give proper delay between SPI transfers. So code has been added which
sets half a period delay between SPI transfers.
diff --git a/libraries/mbed/targets/hal/TARGET_Freescale/TARGET_KPSDK_MCUS/spi_api.c b/libraries/mbed/targets/hal/TARGET_Freescale/TARGET_KPSDK_MCUS/spi_api.c
@@ -91,6 +91,7 @@ void spi_frequency(spi_t *obj, int hz) {
     CLOCK_SYS_GetFreq(kBusClock, &busClock);
     uint32_t spi_address[] = SPI_BASE_ADDRS;
     DSPI_HAL_SetBaudRate(spi_address[obj->instance], kDspiCtar0, (uint32_t)hz, busClock);
+    DSPI_HAL_CalculateDelay(spi_address[obj->instance], kDspiCtar0, kDspiAfterTransfer, busClock, 500000000 / hz);  //Half clock period delay after SPI transfer
 }
 
 static inline int spi_writeable(spi_t * obj) {

Original file line number	Diff line number	Diff line change
`@@ -91,6 +91,7 @@ void spi_frequency(spi_t *obj, int hz) {`
`91`	`91`	`CLOCK_SYS_GetFreq(kBusClock, &busClock);`
`92`	`92`	`uint32_t spi_address[] = SPI_BASE_ADDRS;`
`93`	`93`	`DSPI_HAL_SetBaudRate(spi_address[obj->instance], kDspiCtar0, (uint32_t)hz, busClock);`
	`94`	`+ DSPI_HAL_CalculateDelay(spi_address[obj->instance], kDspiCtar0, kDspiAfterTransfer, busClock, 500000000 / hz); //Half clock period delay after SPI transfer`
`94`	`95`	`}`
`95`	`96`
`96`	`97`	`static inline int spi_writeable(spi_t * obj) {`