mbed library sources
Dependents: frdm_kl05z_gpio_test
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Diff: targets/hal/TARGET_Freescale/TARGET_KSDK_MCUS/TARGET_K64F/spi_api.c
- Revision:
- 146:f64d43ff0c18
diff -r cfacfb0a9e19 -r f64d43ff0c18 targets/hal/TARGET_Freescale/TARGET_KSDK_MCUS/TARGET_K64F/spi_api.c --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/targets/hal/TARGET_Freescale/TARGET_KSDK_MCUS/TARGET_K64F/spi_api.c Wed Apr 02 21:00:08 2014 +0100 @@ -0,0 +1,188 @@ +/* mbed Microcontroller Library + * Copyright (c) 2013 ARM Limited + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ +#include "spi_api.h" + +#include <math.h> + +#include "cmsis.h" +#include "pinmap.h" +#include "error.h" +#include "fsl_clock_manager.h" +#include "fsl_dspi_hal.h" + +static const PinMap PinMap_SPI_SCLK[] = { + {PTD1 , SPI_0, 2}, + {PTE2 , SPI_1, 2}, + {PTA15, SPI_0, 2}, + {PTB11, SPI_1, 2}, + {PTB21, SPI_2, 2}, + {PTC5 , SPI_0, 2}, + {PTD5 , SPI_1, 7}, + {NC , NC , 0} +}; + +static const PinMap PinMap_SPI_MOSI[] = { + {PTD2 , SPI_0, 2}, + {PTE1 , SPI_1, 2}, + {PTE3 , SPI_1, 7}, + {PTA16, SPI_0, 2}, + {PTB16, SPI_1, 2}, + {PTB22, SPI_2, 2}, + {PTC6 , SPI_0, 2}, + {PTD2 , SPI_0, 2}, + {PTD6 , SPI_0, 7}, + {NC , NC , 0} +}; + +static const PinMap PinMap_SPI_MISO[] = { + {PTD3 , SPI_0, 2}, + {PTE1 , SPI_1, 7}, + {PTE3 , SPI_1, 2}, + {PTA17, SPI_0, 2}, + {PTB17, SPI_1, 2}, + {PTB23, SPI_2, 2}, + {PTC7 , SPI_0, 2}, + {PTD3 , SPI_0, 2}, + {PTD7 , SPI_1, 7}, + {NC , NC , 0} +}; + +static const PinMap PinMap_SPI_SSEL[] = { + {PTD0 , SPI_0, 2}, + {PTE4 , SPI_1, 2}, + {PTA14, SPI_0, 2}, + {PTB10, SPI_1, 2}, + {PTB20, SPI_2, 2}, + {PTC4 , SPI_0, 2}, + {PTD4 , SPI_1, 7}, + {NC , NC , 0} +}; + +static void spi_set_delays(uint32_t instance) { + dspi_delay_settings_config_t delay_config; + delay_config.pcsToSck = 1; /*!< PCS to SCK delay (CSSCK): initialize the scalar + * value to '1' to provide the master with a little + * more data-in read setup time. + */ + delay_config.pcsToSckPre = 0; /*!< PCS to SCK delay prescalar (PCSSCK) */ + delay_config.afterSckPre = 0; /*!< After SCK delay prescalar (PASC)*/ + delay_config.afterSck = 0; /*!< After SCK delay scalar (ASC)*/ + delay_config.afterTransferPre = 0; /*!< Delay after transfer prescalar (PDT)*/ + delay_config.afterTransfer = 0; + dspi_hal_configure_delays(instance, kDspiCtar0, &delay_config); +} + +void spi_init(spi_t *obj, PinName mosi, PinName miso, PinName sclk, PinName ssel) { + // determine the SPI to use + uint32_t spi_mosi = pinmap_peripheral(mosi, PinMap_SPI_MOSI); + uint32_t spi_miso = pinmap_peripheral(miso, PinMap_SPI_MISO); + uint32_t spi_sclk = pinmap_peripheral(sclk, PinMap_SPI_SCLK); + uint32_t spi_ssel = pinmap_peripheral(ssel, PinMap_SPI_SSEL); + uint32_t spi_data = pinmap_merge(spi_mosi, spi_miso); + uint32_t spi_cntl = pinmap_merge(spi_sclk, spi_ssel); + + obj->instance = pinmap_merge(spi_data, spi_cntl); + if ((int)obj->instance == NC) { + error("SPI pinout mapping failed"); + } + + // enable power and clocking + clock_manager_set_gate(kClockModuleSPI, obj->instance, true); + + dspi_hal_disable(obj->instance); + // set default format and frequency + if (ssel == NC) { + spi_format(obj, 8, 0, 0); // 8 bits, mode 0, master + } else { + spi_format(obj, 8, 0, 1); // 8 bits, mode 0, slave + } + spi_set_delays(obj->instance); + spi_frequency(obj, 1000000); + + dspi_hal_enable(obj->instance); + dspi_hal_start_transfer(obj->instance); + + // pin out the spi pins + pinmap_pinout(mosi, PinMap_SPI_MOSI); + pinmap_pinout(miso, PinMap_SPI_MISO); + pinmap_pinout(sclk, PinMap_SPI_SCLK); + if (ssel != NC) { + pinmap_pinout(ssel, PinMap_SPI_SSEL); + } +} + +void spi_free(spi_t *obj) { + // [TODO] +} +void spi_format(spi_t *obj, int bits, int mode, int slave) { + dspi_data_format_config_t config = {0}; + config.bitsPerFrame = (uint32_t)bits; + config.clkPolarity = (mode & 0x2) ? kDspiClockPolarity_ActiveLow : kDspiClockPolarity_ActiveHigh; + config.clkPhase = (mode & 0x1) ? kDspiClockPhase_SecondEdge : kDspiClockPhase_FirstEdge; + config.direction = kDspiMsbFirst; + dspi_status_t result = dspi_hal_configure_data_format(obj->instance, kDspiCtar0, &config); + if (result != kStatus_DSPI_Success) { + error("Failed to configure SPI data format"); + } + + if (slave) { + dspi_hal_set_master_slave(obj->instance, kDspiSlave); + } else { + dspi_hal_set_master_slave(obj->instance, kDspiMaster); + } +} + +void spi_frequency(spi_t *obj, int hz) { + uint32_t busClock; + clock_manager_get_frequency(kBusClock, &busClock); + dspi_hal_set_baud(obj->instance, kDspiCtar0, (uint32_t)hz, busClock); +} + +static inline int spi_writeable(spi_t * obj) { + return dspi_hal_get_status_flag(obj->instance, kDspiTxFifoFillRequest); +} + +static inline int spi_readable(spi_t * obj) { + return dspi_hal_get_status_flag(obj->instance, kDspiRxFifoDrainRequest); +} + +int spi_master_write(spi_t *obj, int value) { + // wait tx buffer empty + while(!spi_writeable(obj)); + dspi_command_config_t command = {0}; + command.isEndOfQueue = true; + command.isChipSelectContinuous = 0; + dspi_hal_write_data_master_mode(obj->instance, &command, (uint16_t)value); + dspi_hal_clear_status_flag(obj->instance, kDspiTxFifoFillRequest); + + // wait rx buffer full + while (!spi_readable(obj)); + dspi_hal_clear_status_flag(obj->instance, kDspiRxFifoDrainRequest); + return dspi_hal_read_data(obj->instance) & 0xff; +} + +int spi_slave_receive(spi_t *obj) { + return spi_readable(obj); +} + +int spi_slave_read(spi_t *obj) { + return dspi_hal_read_data(obj->instance); +} + +void spi_slave_write(spi_t *obj, int value) { + while (!spi_writeable(obj)); + dspi_hal_write_data_slave_mode(obj->instance, (uint32_t)value); +}