Morpheus / target-freescale-ksdk

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spi_api.c@0:e4d670b91a9a, 2016-03-23 (annotated)

Committer:
screamer
Date:
Wed Mar 23 21:26:50 2016 +0000
Revision:
0:e4d670b91a9a
Initial revision

Who changed what in which revision?

UserRevisionLine numberNew contents of line
screamer 0:e4d670b91a9a 1 /* mbed Microcontroller Library
screamer 0:e4d670b91a9a 2 * Copyright (c) 2013 ARM Limited
screamer 0:e4d670b91a9a 3 *
screamer 0:e4d670b91a9a 4 * Licensed under the Apache License, Version 2.0 (the "License");
screamer 0:e4d670b91a9a 5 * you may not use this file except in compliance with the License.
screamer 0:e4d670b91a9a 6 * You may obtain a copy of the License at
screamer 0:e4d670b91a9a 7 *
screamer 0:e4d670b91a9a 8 * http://www.apache.org/licenses/LICENSE-2.0
screamer 0:e4d670b91a9a 9 *
screamer 0:e4d670b91a9a 10 * Unless required by applicable law or agreed to in writing, software
screamer 0:e4d670b91a9a 11 * distributed under the License is distributed on an "AS IS" BASIS,
screamer 0:e4d670b91a9a 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
screamer 0:e4d670b91a9a 13 * See the License for the specific language governing permissions and
screamer 0:e4d670b91a9a 14 * limitations under the License.
screamer 0:e4d670b91a9a 15 */
screamer 0:e4d670b91a9a 16 #include <math.h>
screamer 0:e4d670b91a9a 17 #include "mbed_assert.h"
screamer 0:e4d670b91a9a 18
screamer 0:e4d670b91a9a 19 #include "spi_api.h"
screamer 0:e4d670b91a9a 20
screamer 0:e4d670b91a9a 21 #if DEVICE_SPI
screamer 0:e4d670b91a9a 22
screamer 0:e4d670b91a9a 23 #include "cmsis.h"
screamer 0:e4d670b91a9a 24 #include "pinmap.h"
screamer 0:e4d670b91a9a 25 #include "mbed_error.h"
screamer 0:e4d670b91a9a 26 #include "fsl_clock_manager.h"
screamer 0:e4d670b91a9a 27 #include "fsl_dspi_hal.h"
screamer 0:e4d670b91a9a 28 #include "PeripheralPins.h"
screamer 0:e4d670b91a9a 29
screamer 0:e4d670b91a9a 30 void spi_init(spi_t *obj, PinName mosi, PinName miso, PinName sclk, PinName ssel) {
screamer 0:e4d670b91a9a 31 // determine the SPI to use
screamer 0:e4d670b91a9a 32 uint32_t spi_mosi = pinmap_peripheral(mosi, PinMap_SPI_MOSI);
screamer 0:e4d670b91a9a 33 uint32_t spi_miso = pinmap_peripheral(miso, PinMap_SPI_MISO);
screamer 0:e4d670b91a9a 34 uint32_t spi_sclk = pinmap_peripheral(sclk, PinMap_SPI_SCLK);
screamer 0:e4d670b91a9a 35 uint32_t spi_ssel = pinmap_peripheral(ssel, PinMap_SPI_SSEL);
screamer 0:e4d670b91a9a 36 uint32_t spi_data = pinmap_merge(spi_mosi, spi_miso);
screamer 0:e4d670b91a9a 37 uint32_t spi_cntl = pinmap_merge(spi_sclk, spi_ssel);
screamer 0:e4d670b91a9a 38
screamer 0:e4d670b91a9a 39 obj->instance = pinmap_merge(spi_data, spi_cntl);
screamer 0:e4d670b91a9a 40 MBED_ASSERT((int)obj->instance != NC);
screamer 0:e4d670b91a9a 41
screamer 0:e4d670b91a9a 42 CLOCK_SYS_EnableSpiClock(obj->instance);
screamer 0:e4d670b91a9a 43 uint32_t spi_address[] = SPI_BASE_ADDRS;
screamer 0:e4d670b91a9a 44 DSPI_HAL_Init(spi_address[obj->instance]);
screamer 0:e4d670b91a9a 45 DSPI_HAL_Disable(spi_address[obj->instance]);
screamer 0:e4d670b91a9a 46 DSPI_HAL_SetDelay(spi_address[obj->instance], kDspiCtar0, 0, 0, kDspiPcsToSck);
screamer 0:e4d670b91a9a 47
screamer 0:e4d670b91a9a 48 DSPI_HAL_Enable(spi_address[obj->instance]);
screamer 0:e4d670b91a9a 49 DSPI_HAL_StartTransfer(spi_address[obj->instance]);
screamer 0:e4d670b91a9a 50
screamer 0:e4d670b91a9a 51 // pin out the spi pins
screamer 0:e4d670b91a9a 52 pinmap_pinout(mosi, PinMap_SPI_MOSI);
screamer 0:e4d670b91a9a 53 pinmap_pinout(miso, PinMap_SPI_MISO);
screamer 0:e4d670b91a9a 54 pinmap_pinout(sclk, PinMap_SPI_SCLK);
screamer 0:e4d670b91a9a 55 if (ssel != NC) {
screamer 0:e4d670b91a9a 56 pinmap_pinout(ssel, PinMap_SPI_SSEL);
screamer 0:e4d670b91a9a 57 }
screamer 0:e4d670b91a9a 58 }
screamer 0:e4d670b91a9a 59
screamer 0:e4d670b91a9a 60 void spi_free(spi_t *obj) {
screamer 0:e4d670b91a9a 61 // [TODO]
screamer 0:e4d670b91a9a 62 }
screamer 0:e4d670b91a9a 63 void spi_format(spi_t *obj, int bits, int mode, int slave) {
screamer 0:e4d670b91a9a 64 dspi_data_format_config_t config = {0};
screamer 0:e4d670b91a9a 65 config.bitsPerFrame = (uint32_t)bits;
screamer 0:e4d670b91a9a 66 config.clkPolarity = (mode & 0x2) ? kDspiClockPolarity_ActiveLow : kDspiClockPolarity_ActiveHigh;
screamer 0:e4d670b91a9a 67 config.clkPhase = (mode & 0x1) ? kDspiClockPhase_SecondEdge : kDspiClockPhase_FirstEdge;
screamer 0:e4d670b91a9a 68 config.direction = kDspiMsbFirst;
screamer 0:e4d670b91a9a 69 uint32_t spi_address[] = SPI_BASE_ADDRS;
screamer 0:e4d670b91a9a 70 dspi_status_t result = DSPI_HAL_SetDataFormat(spi_address[obj->instance], kDspiCtar0, &config);
screamer 0:e4d670b91a9a 71 if (result != kStatus_DSPI_Success) {
screamer 0:e4d670b91a9a 72 error("Failed to configure SPI data format");
screamer 0:e4d670b91a9a 73 }
screamer 0:e4d670b91a9a 74
screamer 0:e4d670b91a9a 75 if (slave) {
screamer 0:e4d670b91a9a 76 DSPI_HAL_SetMasterSlaveMode(spi_address[obj->instance], kDspiSlave);
screamer 0:e4d670b91a9a 77 } else {
screamer 0:e4d670b91a9a 78 DSPI_HAL_SetMasterSlaveMode(spi_address[obj->instance], kDspiMaster);
screamer 0:e4d670b91a9a 79 }
screamer 0:e4d670b91a9a 80 }
screamer 0:e4d670b91a9a 81
screamer 0:e4d670b91a9a 82 void spi_frequency(spi_t *obj, int hz) {
screamer 0:e4d670b91a9a 83 uint32_t busClock;
screamer 0:e4d670b91a9a 84 CLOCK_SYS_GetFreq(kBusClock, &busClock);
screamer 0:e4d670b91a9a 85 uint32_t spi_address[] = SPI_BASE_ADDRS;
screamer 0:e4d670b91a9a 86 DSPI_HAL_SetBaudRate(spi_address[obj->instance], kDspiCtar0, (uint32_t)hz, busClock);
screamer 0:e4d670b91a9a 87 DSPI_HAL_CalculateDelay(spi_address[obj->instance], kDspiCtar0, kDspiLastSckToPcs, busClock, 500000000 / hz); //Half clock period delay after SPI transfer
screamer 0:e4d670b91a9a 88 }
screamer 0:e4d670b91a9a 89
screamer 0:e4d670b91a9a 90 static inline int spi_writeable(spi_t * obj) {
screamer 0:e4d670b91a9a 91 uint32_t spi_address[] = SPI_BASE_ADDRS;
screamer 0:e4d670b91a9a 92 return DSPI_HAL_GetStatusFlag(spi_address[obj->instance], kDspiTxFifoFillRequest);
screamer 0:e4d670b91a9a 93 }
screamer 0:e4d670b91a9a 94
screamer 0:e4d670b91a9a 95 static inline int spi_readable(spi_t * obj) {
screamer 0:e4d670b91a9a 96 uint32_t spi_address[] = SPI_BASE_ADDRS;
screamer 0:e4d670b91a9a 97 return DSPI_HAL_GetStatusFlag(spi_address[obj->instance], kDspiRxFifoDrainRequest);
screamer 0:e4d670b91a9a 98 }
screamer 0:e4d670b91a9a 99
screamer 0:e4d670b91a9a 100 int spi_master_write(spi_t *obj, int value) {
screamer 0:e4d670b91a9a 101 uint32_t spi_address[] = SPI_BASE_ADDRS;
screamer 0:e4d670b91a9a 102
screamer 0:e4d670b91a9a 103 // wait tx buffer empty
screamer 0:e4d670b91a9a 104 while(!spi_writeable(obj));
screamer 0:e4d670b91a9a 105 dspi_command_config_t command = {0};
screamer 0:e4d670b91a9a 106 command.isEndOfQueue = true;
screamer 0:e4d670b91a9a 107 command.isChipSelectContinuous = 0;
screamer 0:e4d670b91a9a 108 DSPI_HAL_WriteDataMastermode(spi_address[obj->instance], &command, (uint16_t)value);
screamer 0:e4d670b91a9a 109 DSPI_HAL_ClearStatusFlag(spi_address[obj->instance], kDspiTxFifoFillRequest);
screamer 0:e4d670b91a9a 110
screamer 0:e4d670b91a9a 111 // wait rx buffer full
screamer 0:e4d670b91a9a 112 while (!spi_readable(obj));
screamer 0:e4d670b91a9a 113 DSPI_HAL_ClearStatusFlag(spi_address[obj->instance], kDspiRxFifoDrainRequest);
screamer 0:e4d670b91a9a 114 return DSPI_HAL_ReadData(spi_address[obj->instance]) & 0xff;
screamer 0:e4d670b91a9a 115 }
screamer 0:e4d670b91a9a 116
screamer 0:e4d670b91a9a 117 int spi_slave_receive(spi_t *obj) {
screamer 0:e4d670b91a9a 118 return spi_readable(obj);
screamer 0:e4d670b91a9a 119 }
screamer 0:e4d670b91a9a 120
screamer 0:e4d670b91a9a 121 int spi_slave_read(spi_t *obj) {
screamer 0:e4d670b91a9a 122 DSPI_HAL_ClearStatusFlag(obj->instance, kDspiRxFifoDrainRequest);
screamer 0:e4d670b91a9a 123 uint32_t spi_address[] = SPI_BASE_ADDRS;
screamer 0:e4d670b91a9a 124 return DSPI_HAL_ReadData(spi_address[obj->instance]);
screamer 0:e4d670b91a9a 125 }
screamer 0:e4d670b91a9a 126
screamer 0:e4d670b91a9a 127 void spi_slave_write(spi_t *obj, int value) {
screamer 0:e4d670b91a9a 128 while (!spi_writeable(obj));
screamer 0:e4d670b91a9a 129 uint32_t spi_address[] = SPI_BASE_ADDRS;
screamer 0:e4d670b91a9a 130 DSPI_HAL_WriteDataSlavemode(spi_address[obj->instance], (uint32_t)value);
screamer 0:e4d670b91a9a 131 }
screamer 0:e4d670b91a9a 132
screamer 0:e4d670b91a9a 133 #endif