mbed library sources
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Superseded
This library was superseded by mbed-dev - https://os.mbed.com/users/mbed_official/code/mbed-dev/.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:
Import librarymbed
The official Mbed 2 C/C++ SDK provides the software platform and libraries to build your applications.
Diff: targets/hal/TARGET_Freescale/TARGET_K20XX/spi_api.c
- Revision:
- 620:49241b7c6da5
- Parent:
- 552:a1b9575155a3
diff -r 034e698bc035 -r 49241b7c6da5 targets/hal/TARGET_Freescale/TARGET_K20XX/spi_api.c --- 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};