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targets/hal/TARGET_Freescale/TARGET_KPSDK_MCUS/spi_api.c@324:406fd2029f23, 2014-09-18 (annotated)

Committer:
mbed_official
Date:
Thu Sep 18 14:00:17 2014 +0100
Revision:
324:406fd2029f23
Child:
533:589848968e4d
Synchronized with git revision a73f28e6fbca9559fbed2726410eeb4c0534a4a5



Full URL: https://github.com/mbedmicro/mbed/commit/a73f28e6fbca9559fbed2726410eeb4c0534a4a5/



Extended #476, which does not break ethernet for K64F

Who changed what in which revision?

UserRevisionLine numberNew 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 // set default format and frequency
mbed_official 324:406fd2029f23 47 if (ssel == NC) {
mbed_official 324:406fd2029f23 48 spi_format(obj, 8, 0, 0); // 8 bits, mode 0, master
mbed_official 324:406fd2029f23 49 } else {
mbed_official 324:406fd2029f23 50 spi_format(obj, 8, 0, 1); // 8 bits, mode 0, slave
mbed_official 324:406fd2029f23 51 }
mbed_official 324:406fd2029f23 52 DSPI_HAL_SetDelay(spi_address[obj->instance], kDspiCtar0, 0, 0, kDspiPcsToSck);
mbed_official 324:406fd2029f23 53 spi_frequency(obj, 1000000);
mbed_official 324:406fd2029f23 54
mbed_official 324:406fd2029f23 55 DSPI_HAL_Enable(spi_address[obj->instance]);
mbed_official 324:406fd2029f23 56 DSPI_HAL_StartTransfer(spi_address[obj->instance]);
mbed_official 324:406fd2029f23 57
mbed_official 324:406fd2029f23 58 // pin out the spi pins
mbed_official 324:406fd2029f23 59 pinmap_pinout(mosi, PinMap_SPI_MOSI);
mbed_official 324:406fd2029f23 60 pinmap_pinout(miso, PinMap_SPI_MISO);
mbed_official 324:406fd2029f23 61 pinmap_pinout(sclk, PinMap_SPI_SCLK);
mbed_official 324:406fd2029f23 62 if (ssel != NC) {
mbed_official 324:406fd2029f23 63 pinmap_pinout(ssel, PinMap_SPI_SSEL);
mbed_official 324:406fd2029f23 64 }
mbed_official 324:406fd2029f23 65 }
mbed_official 324:406fd2029f23 66
mbed_official 324:406fd2029f23 67 void spi_free(spi_t *obj) {
mbed_official 324:406fd2029f23 68 // [TODO]
mbed_official 324:406fd2029f23 69 }
mbed_official 324:406fd2029f23 70 void spi_format(spi_t *obj, int bits, int mode, int slave) {
mbed_official 324:406fd2029f23 71 dspi_data_format_config_t config = {0};
mbed_official 324:406fd2029f23 72 config.bitsPerFrame = (uint32_t)bits;
mbed_official 324:406fd2029f23 73 config.clkPolarity = (mode & 0x2) ? kDspiClockPolarity_ActiveLow : kDspiClockPolarity_ActiveHigh;
mbed_official 324:406fd2029f23 74 config.clkPhase = (mode & 0x1) ? kDspiClockPhase_SecondEdge : kDspiClockPhase_FirstEdge;
mbed_official 324:406fd2029f23 75 config.direction = kDspiMsbFirst;
mbed_official 324:406fd2029f23 76 uint32_t spi_address[] = SPI_BASE_ADDRS;
mbed_official 324:406fd2029f23 77 dspi_status_t result = DSPI_HAL_SetDataFormat(spi_address[obj->instance], kDspiCtar0, &config);
mbed_official 324:406fd2029f23 78 if (result != kStatus_DSPI_Success) {
mbed_official 324:406fd2029f23 79 error("Failed to configure SPI data format");
mbed_official 324:406fd2029f23 80 }
mbed_official 324:406fd2029f23 81
mbed_official 324:406fd2029f23 82 if (slave) {
mbed_official 324:406fd2029f23 83 DSPI_HAL_SetMasterSlaveMode(spi_address[obj->instance], kDspiSlave);
mbed_official 324:406fd2029f23 84 } else {
mbed_official 324:406fd2029f23 85 DSPI_HAL_SetMasterSlaveMode(spi_address[obj->instance], kDspiMaster);
mbed_official 324:406fd2029f23 86 }
mbed_official 324:406fd2029f23 87 }
mbed_official 324:406fd2029f23 88
mbed_official 324:406fd2029f23 89 void spi_frequency(spi_t *obj, int hz) {
mbed_official 324:406fd2029f23 90 uint32_t busClock;
mbed_official 324:406fd2029f23 91 CLOCK_SYS_GetFreq(kBusClock, &busClock);
mbed_official 324:406fd2029f23 92 uint32_t spi_address[] = SPI_BASE_ADDRS;
mbed_official 324:406fd2029f23 93 DSPI_HAL_SetBaudRate(spi_address[obj->instance], kDspiCtar0, (uint32_t)hz, busClock);
mbed_official 324:406fd2029f23 94 }
mbed_official 324:406fd2029f23 95
mbed_official 324:406fd2029f23 96 static inline int spi_writeable(spi_t * obj) {
mbed_official 324:406fd2029f23 97 uint32_t spi_address[] = SPI_BASE_ADDRS;
mbed_official 324:406fd2029f23 98 return DSPI_HAL_GetStatusFlag(spi_address[obj->instance], kDspiTxFifoFillRequest);
mbed_official 324:406fd2029f23 99 }
mbed_official 324:406fd2029f23 100
mbed_official 324:406fd2029f23 101 static inline int spi_readable(spi_t * obj) {
mbed_official 324:406fd2029f23 102 uint32_t spi_address[] = SPI_BASE_ADDRS;
mbed_official 324:406fd2029f23 103 return DSPI_HAL_GetStatusFlag(spi_address[obj->instance], kDspiRxFifoDrainRequest);
mbed_official 324:406fd2029f23 104 }
mbed_official 324:406fd2029f23 105
mbed_official 324:406fd2029f23 106 int spi_master_write(spi_t *obj, int value) {
mbed_official 324:406fd2029f23 107 uint32_t spi_address[] = SPI_BASE_ADDRS;
mbed_official 324:406fd2029f23 108
mbed_official 324:406fd2029f23 109 // wait tx buffer empty
mbed_official 324:406fd2029f23 110 while(!spi_writeable(obj));
mbed_official 324:406fd2029f23 111 dspi_command_config_t command = {0};
mbed_official 324:406fd2029f23 112 command.isEndOfQueue = true;
mbed_official 324:406fd2029f23 113 command.isChipSelectContinuous = 0;
mbed_official 324:406fd2029f23 114 DSPI_HAL_WriteDataMastermode(spi_address[obj->instance], &command, (uint16_t)value);
mbed_official 324:406fd2029f23 115 DSPI_HAL_ClearStatusFlag(spi_address[obj->instance], kDspiTxFifoFillRequest);
mbed_official 324:406fd2029f23 116
mbed_official 324:406fd2029f23 117 // wait rx buffer full
mbed_official 324:406fd2029f23 118 while (!spi_readable(obj));
mbed_official 324:406fd2029f23 119 DSPI_HAL_ClearStatusFlag(spi_address[obj->instance], kDspiRxFifoDrainRequest);
mbed_official 324:406fd2029f23 120 return DSPI_HAL_ReadData(spi_address[obj->instance]) & 0xff;
mbed_official 324:406fd2029f23 121 }
mbed_official 324:406fd2029f23 122
mbed_official 324:406fd2029f23 123 int spi_slave_receive(spi_t *obj) {
mbed_official 324:406fd2029f23 124 return spi_readable(obj);
mbed_official 324:406fd2029f23 125 }
mbed_official 324:406fd2029f23 126
mbed_official 324:406fd2029f23 127 int spi_slave_read(spi_t *obj) {
mbed_official 324:406fd2029f23 128 DSPI_HAL_ClearStatusFlag(obj->instance, kDspiRxFifoDrainRequest);
mbed_official 324:406fd2029f23 129 uint32_t spi_address[] = SPI_BASE_ADDRS;
mbed_official 324:406fd2029f23 130 return DSPI_HAL_ReadData(spi_address[obj->instance]);
mbed_official 324:406fd2029f23 131 }
mbed_official 324:406fd2029f23 132
mbed_official 324:406fd2029f23 133 void spi_slave_write(spi_t *obj, int value) {
mbed_official 324:406fd2029f23 134 while (!spi_writeable(obj));
mbed_official 324:406fd2029f23 135 uint32_t spi_address[] = SPI_BASE_ADDRS;
mbed_official 324:406fd2029f23 136 DSPI_HAL_WriteDataSlavemode(spi_address[obj->instance], (uint32_t)value);
mbed_official 324:406fd2029f23 137 }
mbed_official 324:406fd2029f23 138
mbed_official 324:406fd2029f23 139 #endif