Diff: targets/hal/TARGET_Freescale/TARGET_KPSDK_MCUS/TARGET_MCU_K64F/spi_api.c

Revision:

320:be04b2b1e3f2

Parent:

285:31249416b6f9

diff -r b6f57f64aae2 -r be04b2b1e3f2 targets/hal/TARGET_Freescale/TARGET_KPSDK_MCUS/TARGET_MCU_K64F/spi_api.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/hal/TARGET_Freescale/TARGET_KPSDK_MCUS/TARGET_MCU_K64F/spi_api.c	Thu Sep 11 17:00:08 2014 +0100
@@ -0,0 +1,145 @@
+/* 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 <math.h>
+#include "mbed_assert.h"
+
+#include "spi_api.h"
+
+#if DEVICE_SPI
+
+#include "cmsis.h"
+#include "pinmap.h"
+#include "mbed_error.h"
+#include "fsl_clock_manager.h"
+#include "fsl_dspi_hal.h"
+#include "PeripheralPins.h"
+
+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);
+    MBED_ASSERT((int)obj->instance != NC);
+
+    // 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) {
+    dspi_hal_clear_status_flag(obj->instance, kDspiRxFifoDrainRequest);
+    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);
+}
+
+#endif