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Dependents: Encrypted my_mbed lklk CyaSSL_DTLS_Cellular ... more
Superseded
This library was superseded by mbed-dev - https://os.mbed.com/users/mbed_official/code/mbed-dev/.
Development branch of the mbed library sources. This library is kept in synch with the latest changes from the mbed SDK and it is not guaranteed to work.
If you are looking for a stable and tested release, please import one of the official mbed library releases:
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The official Mbed 2 C/C++ SDK provides the software platform and libraries to build your applications.
Last commit 20 Feb 2019 by 
mbed official
Diff: targets/hal/TARGET_Freescale/TARGET_K20XX/spi_api.c
- Revision:
- 620:49241b7c6da5
- Parent:
- 552:a1b9575155a3
--- a/targets/hal/TARGET_Freescale/TARGET_K20XX/spi_api.c Fri Sep 04 09:30:10 2015 +0100
+++ b/targets/hal/TARGET_Freescale/TARGET_K20XX/spi_api.c Mon Sep 07 10:00:10 2015 +0100
@@ -60,16 +60,27 @@
MBED_ASSERT((bits > 4) || (bits < 16));
MBED_ASSERT((mode >= 0) && (mode <= 3));
- uint32_t polarity = (mode & 0x2) ? 1 : 0;
- uint32_t phase = (mode & 0x1) ? 1 : 0;
+ uint8_t polarity = (mode & 0x2) ? 1 : 0;
+ uint8_t phase = (mode & 0x1) ? 1 : 0;
+ uint8_t old_polarity = (obj->spi->CTAR[0] & SPI_CTAR_CPOL_MASK) != 0;
// set master/slave
- obj->spi->MCR &= ~SPI_MCR_MSTR_MASK;
- obj->spi->MCR |= ((!slave) << SPI_MCR_MSTR_SHIFT);
+ if (slave) {
+ obj->spi->MCR &= ~SPI_MCR_MSTR_MASK;
+ } else {
+ obj->spi->MCR |= (1UL << SPI_MCR_MSTR_SHIFT);
+ }
// CTAR0 is used
obj->spi->CTAR[0] &= ~(SPI_CTAR_CPHA_MASK | SPI_CTAR_CPOL_MASK | SPI_CTAR_FMSZ_MASK);
obj->spi->CTAR[0] |= (polarity << SPI_CTAR_CPOL_SHIFT) | (phase << SPI_CTAR_CPHA_SHIFT) | ((bits - 1) << SPI_CTAR_FMSZ_SHIFT);
+
+ //If clk idle state was changed, start a dummy transmission
+ //This is a 'feature' in DSPI: https://community.freescale.com/thread/105526
+ if ((old_polarity != polarity) && (slave == 0)) {
+ //Start transfer (CS should be high, so shouldn't matter)
+ spi_master_write(obj, 0xFFFF);
+ }
}
static const uint8_t baudrate_prescaler[] = {2,3,5,7};
