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targets/hal/TARGET_Freescale/TARGET_KPSDK_MCUS/spi_api.c@621:9c82b0f79f3d, 2015-09-11 (annotated)
- Committer:
- mbed_official
- Date:
- Fri Sep 11 09:30:09 2015 +0100
- Revision:
- 621:9c82b0f79f3d
- Parent:
- 552:a1b9575155a3
Synchronized with git revision 6c1d63e069ab9bd86de92e8296ca783681257538
Full URL: https://github.com/mbedmicro/mbed/commit/6c1d63e069ab9bd86de92e8296ca783681257538/
ignore target files not supported by the yotta module
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
mbed_official | 324:406fd2029f23 | 1 | /* mbed Microcontroller Library |
mbed_official | 324:406fd2029f23 | 2 | * Copyright (c) 2013 ARM Limited |
mbed_official | 324:406fd2029f23 | 3 | * |
mbed_official | 324:406fd2029f23 | 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
mbed_official | 324:406fd2029f23 | 5 | * you may not use this file except in compliance with the License. |
mbed_official | 324:406fd2029f23 | 6 | * You may obtain a copy of the License at |
mbed_official | 324:406fd2029f23 | 7 | * |
mbed_official | 324:406fd2029f23 | 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
mbed_official | 324:406fd2029f23 | 9 | * |
mbed_official | 324:406fd2029f23 | 10 | * Unless required by applicable law or agreed to in writing, software |
mbed_official | 324:406fd2029f23 | 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
mbed_official | 324:406fd2029f23 | 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
mbed_official | 324:406fd2029f23 | 13 | * See the License for the specific language governing permissions and |
mbed_official | 324:406fd2029f23 | 14 | * limitations under the License. |
mbed_official | 324:406fd2029f23 | 15 | */ |
mbed_official | 324:406fd2029f23 | 16 | #include <math.h> |
mbed_official | 324:406fd2029f23 | 17 | #include "mbed_assert.h" |
mbed_official | 324:406fd2029f23 | 18 | |
mbed_official | 324:406fd2029f23 | 19 | #include "spi_api.h" |
mbed_official | 324:406fd2029f23 | 20 | |
mbed_official | 324:406fd2029f23 | 21 | #if DEVICE_SPI |
mbed_official | 324:406fd2029f23 | 22 | |
mbed_official | 324:406fd2029f23 | 23 | #include "cmsis.h" |
mbed_official | 324:406fd2029f23 | 24 | #include "pinmap.h" |
mbed_official | 324:406fd2029f23 | 25 | #include "mbed_error.h" |
mbed_official | 324:406fd2029f23 | 26 | #include "fsl_clock_manager.h" |
mbed_official | 324:406fd2029f23 | 27 | #include "fsl_dspi_hal.h" |
mbed_official | 324:406fd2029f23 | 28 | #include "PeripheralPins.h" |
mbed_official | 324:406fd2029f23 | 29 | |
mbed_official | 324:406fd2029f23 | 30 | void spi_init(spi_t *obj, PinName mosi, PinName miso, PinName sclk, PinName ssel) { |
mbed_official | 324:406fd2029f23 | 31 | // determine the SPI to use |
mbed_official | 324:406fd2029f23 | 32 | uint32_t spi_mosi = pinmap_peripheral(mosi, PinMap_SPI_MOSI); |
mbed_official | 324:406fd2029f23 | 33 | uint32_t spi_miso = pinmap_peripheral(miso, PinMap_SPI_MISO); |
mbed_official | 324:406fd2029f23 | 34 | uint32_t spi_sclk = pinmap_peripheral(sclk, PinMap_SPI_SCLK); |
mbed_official | 324:406fd2029f23 | 35 | uint32_t spi_ssel = pinmap_peripheral(ssel, PinMap_SPI_SSEL); |
mbed_official | 324:406fd2029f23 | 36 | uint32_t spi_data = pinmap_merge(spi_mosi, spi_miso); |
mbed_official | 324:406fd2029f23 | 37 | uint32_t spi_cntl = pinmap_merge(spi_sclk, spi_ssel); |
mbed_official | 324:406fd2029f23 | 38 | |
mbed_official | 324:406fd2029f23 | 39 | obj->instance = pinmap_merge(spi_data, spi_cntl); |
mbed_official | 324:406fd2029f23 | 40 | MBED_ASSERT((int)obj->instance != NC); |
mbed_official | 324:406fd2029f23 | 41 | |
mbed_official | 324:406fd2029f23 | 42 | CLOCK_SYS_EnableSpiClock(obj->instance); |
mbed_official | 324:406fd2029f23 | 43 | uint32_t spi_address[] = SPI_BASE_ADDRS; |
mbed_official | 324:406fd2029f23 | 44 | DSPI_HAL_Init(spi_address[obj->instance]); |
mbed_official | 324:406fd2029f23 | 45 | DSPI_HAL_Disable(spi_address[obj->instance]); |
mbed_official | 324:406fd2029f23 | 46 | DSPI_HAL_SetDelay(spi_address[obj->instance], kDspiCtar0, 0, 0, kDspiPcsToSck); |
mbed_official | 324:406fd2029f23 | 47 | |
mbed_official | 324:406fd2029f23 | 48 | DSPI_HAL_Enable(spi_address[obj->instance]); |
mbed_official | 324:406fd2029f23 | 49 | DSPI_HAL_StartTransfer(spi_address[obj->instance]); |
mbed_official | 324:406fd2029f23 | 50 | |
mbed_official | 324:406fd2029f23 | 51 | // pin out the spi pins |
mbed_official | 324:406fd2029f23 | 52 | pinmap_pinout(mosi, PinMap_SPI_MOSI); |
mbed_official | 324:406fd2029f23 | 53 | pinmap_pinout(miso, PinMap_SPI_MISO); |
mbed_official | 324:406fd2029f23 | 54 | pinmap_pinout(sclk, PinMap_SPI_SCLK); |
mbed_official | 324:406fd2029f23 | 55 | if (ssel != NC) { |
mbed_official | 324:406fd2029f23 | 56 | pinmap_pinout(ssel, PinMap_SPI_SSEL); |
mbed_official | 324:406fd2029f23 | 57 | } |
mbed_official | 324:406fd2029f23 | 58 | } |
mbed_official | 324:406fd2029f23 | 59 | |
mbed_official | 324:406fd2029f23 | 60 | void spi_free(spi_t *obj) { |
mbed_official | 324:406fd2029f23 | 61 | // [TODO] |
mbed_official | 324:406fd2029f23 | 62 | } |
mbed_official | 324:406fd2029f23 | 63 | void spi_format(spi_t *obj, int bits, int mode, int slave) { |
mbed_official | 324:406fd2029f23 | 64 | dspi_data_format_config_t config = {0}; |
mbed_official | 324:406fd2029f23 | 65 | config.bitsPerFrame = (uint32_t)bits; |
mbed_official | 324:406fd2029f23 | 66 | config.clkPolarity = (mode & 0x2) ? kDspiClockPolarity_ActiveLow : kDspiClockPolarity_ActiveHigh; |
mbed_official | 324:406fd2029f23 | 67 | config.clkPhase = (mode & 0x1) ? kDspiClockPhase_SecondEdge : kDspiClockPhase_FirstEdge; |
mbed_official | 324:406fd2029f23 | 68 | config.direction = kDspiMsbFirst; |
mbed_official | 324:406fd2029f23 | 69 | uint32_t spi_address[] = SPI_BASE_ADDRS; |
mbed_official | 324:406fd2029f23 | 70 | dspi_status_t result = DSPI_HAL_SetDataFormat(spi_address[obj->instance], kDspiCtar0, &config); |
mbed_official | 324:406fd2029f23 | 71 | if (result != kStatus_DSPI_Success) { |
mbed_official | 324:406fd2029f23 | 72 | error("Failed to configure SPI data format"); |
mbed_official | 324:406fd2029f23 | 73 | } |
mbed_official | 324:406fd2029f23 | 74 | |
mbed_official | 324:406fd2029f23 | 75 | if (slave) { |
mbed_official | 324:406fd2029f23 | 76 | DSPI_HAL_SetMasterSlaveMode(spi_address[obj->instance], kDspiSlave); |
mbed_official | 324:406fd2029f23 | 77 | } else { |
mbed_official | 324:406fd2029f23 | 78 | DSPI_HAL_SetMasterSlaveMode(spi_address[obj->instance], kDspiMaster); |
mbed_official | 324:406fd2029f23 | 79 | } |
mbed_official | 324:406fd2029f23 | 80 | } |
mbed_official | 324:406fd2029f23 | 81 | |
mbed_official | 324:406fd2029f23 | 82 | void spi_frequency(spi_t *obj, int hz) { |
mbed_official | 324:406fd2029f23 | 83 | uint32_t busClock; |
mbed_official | 324:406fd2029f23 | 84 | CLOCK_SYS_GetFreq(kBusClock, &busClock); |
mbed_official | 324:406fd2029f23 | 85 | uint32_t spi_address[] = SPI_BASE_ADDRS; |
mbed_official | 324:406fd2029f23 | 86 | DSPI_HAL_SetBaudRate(spi_address[obj->instance], kDspiCtar0, (uint32_t)hz, busClock); |
mbed_official | 533:589848968e4d | 87 | DSPI_HAL_CalculateDelay(spi_address[obj->instance], kDspiCtar0, kDspiLastSckToPcs, busClock, 500000000 / hz); //Half clock period delay after SPI transfer |
mbed_official | 324:406fd2029f23 | 88 | } |
mbed_official | 324:406fd2029f23 | 89 | |
mbed_official | 324:406fd2029f23 | 90 | static inline int spi_writeable(spi_t * obj) { |
mbed_official | 324:406fd2029f23 | 91 | uint32_t spi_address[] = SPI_BASE_ADDRS; |
mbed_official | 324:406fd2029f23 | 92 | return DSPI_HAL_GetStatusFlag(spi_address[obj->instance], kDspiTxFifoFillRequest); |
mbed_official | 324:406fd2029f23 | 93 | } |
mbed_official | 324:406fd2029f23 | 94 | |
mbed_official | 324:406fd2029f23 | 95 | static inline int spi_readable(spi_t * obj) { |
mbed_official | 324:406fd2029f23 | 96 | uint32_t spi_address[] = SPI_BASE_ADDRS; |
mbed_official | 324:406fd2029f23 | 97 | return DSPI_HAL_GetStatusFlag(spi_address[obj->instance], kDspiRxFifoDrainRequest); |
mbed_official | 324:406fd2029f23 | 98 | } |
mbed_official | 324:406fd2029f23 | 99 | |
mbed_official | 324:406fd2029f23 | 100 | int spi_master_write(spi_t *obj, int value) { |
mbed_official | 324:406fd2029f23 | 101 | uint32_t spi_address[] = SPI_BASE_ADDRS; |
mbed_official | 324:406fd2029f23 | 102 | |
mbed_official | 324:406fd2029f23 | 103 | // wait tx buffer empty |
mbed_official | 324:406fd2029f23 | 104 | while(!spi_writeable(obj)); |
mbed_official | 324:406fd2029f23 | 105 | dspi_command_config_t command = {0}; |
mbed_official | 324:406fd2029f23 | 106 | command.isEndOfQueue = true; |
mbed_official | 324:406fd2029f23 | 107 | command.isChipSelectContinuous = 0; |
mbed_official | 324:406fd2029f23 | 108 | DSPI_HAL_WriteDataMastermode(spi_address[obj->instance], &command, (uint16_t)value); |
mbed_official | 324:406fd2029f23 | 109 | DSPI_HAL_ClearStatusFlag(spi_address[obj->instance], kDspiTxFifoFillRequest); |
mbed_official | 324:406fd2029f23 | 110 | |
mbed_official | 324:406fd2029f23 | 111 | // wait rx buffer full |
mbed_official | 324:406fd2029f23 | 112 | while (!spi_readable(obj)); |
mbed_official | 324:406fd2029f23 | 113 | DSPI_HAL_ClearStatusFlag(spi_address[obj->instance], kDspiRxFifoDrainRequest); |
mbed_official | 324:406fd2029f23 | 114 | return DSPI_HAL_ReadData(spi_address[obj->instance]) & 0xff; |
mbed_official | 324:406fd2029f23 | 115 | } |
mbed_official | 324:406fd2029f23 | 116 | |
mbed_official | 324:406fd2029f23 | 117 | int spi_slave_receive(spi_t *obj) { |
mbed_official | 324:406fd2029f23 | 118 | return spi_readable(obj); |
mbed_official | 324:406fd2029f23 | 119 | } |
mbed_official | 324:406fd2029f23 | 120 | |
mbed_official | 324:406fd2029f23 | 121 | int spi_slave_read(spi_t *obj) { |
mbed_official | 324:406fd2029f23 | 122 | DSPI_HAL_ClearStatusFlag(obj->instance, kDspiRxFifoDrainRequest); |
mbed_official | 324:406fd2029f23 | 123 | uint32_t spi_address[] = SPI_BASE_ADDRS; |
mbed_official | 324:406fd2029f23 | 124 | return DSPI_HAL_ReadData(spi_address[obj->instance]); |
mbed_official | 324:406fd2029f23 | 125 | } |
mbed_official | 324:406fd2029f23 | 126 | |
mbed_official | 324:406fd2029f23 | 127 | void spi_slave_write(spi_t *obj, int value) { |
mbed_official | 324:406fd2029f23 | 128 | while (!spi_writeable(obj)); |
mbed_official | 324:406fd2029f23 | 129 | uint32_t spi_address[] = SPI_BASE_ADDRS; |
mbed_official | 324:406fd2029f23 | 130 | DSPI_HAL_WriteDataSlavemode(spi_address[obj->instance], (uint32_t)value); |
mbed_official | 324:406fd2029f23 | 131 | } |
mbed_official | 324:406fd2029f23 | 132 | |
mbed_official | 324:406fd2029f23 | 133 | #endif |