Diff: mbed-os/targets/TARGET_Freescale/TARGET_MCUXpresso_MCUS/TARGET_KL43Z/spi_api.c

Revision:

0:8fdf9a60065b

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed-os/targets/TARGET_Freescale/TARGET_MCUXpresso_MCUS/TARGET_KL43Z/spi_api.c	Wed Oct 10 00:33:53 2018 +0000
@@ -0,0 +1,155 @@
+/* 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_spi.h"
+#include "peripheral_clock_defines.h"
+#include "PeripheralPins.h"
+
+/* Array of SPI peripheral base address. */
+static SPI_Type *const spi_address[] = SPI_BASE_PTRS;
+/* Array of SPI bus clock frequencies */
+static clock_name_t const spi_clocks[] = SPI_CLOCK_FREQS;
+
+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);
+
+    // 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)
+{
+    SPI_Deinit(spi_address[obj->instance]);
+}
+
+void spi_format(spi_t *obj, int bits, int mode, int slave)
+{
+
+    spi_master_config_t master_config;
+    spi_slave_config_t slave_config;
+
+    if ((bits != 8) && (bits != 16)) {
+        error("Only 8bits and 16bits SPI supported");
+        return;
+    }
+
+    if (slave) {
+        /* Slave config */
+        SPI_SlaveGetDefaultConfig(&slave_config);
+        slave_config.dataMode = (bits == 16) ? kSPI_16BitMode : kSPI_8BitMode;
+        slave_config.polarity = (mode & 0x2) ? kSPI_ClockPolarityActiveLow : kSPI_ClockPolarityActiveHigh;
+        slave_config.phase = (mode & 0x1) ? kSPI_ClockPhaseSecondEdge : kSPI_ClockPhaseFirstEdge;
+
+        SPI_SlaveInit(spi_address[obj->instance], &slave_config);
+    } else {
+        /* Master config */
+        SPI_MasterGetDefaultConfig(&master_config);
+        master_config.dataMode = (bits == 16) ? kSPI_16BitMode : kSPI_8BitMode;
+        master_config.polarity = (mode & 0x2) ? kSPI_ClockPolarityActiveLow : kSPI_ClockPolarityActiveHigh;
+        master_config.phase = (mode & 0x1) ? kSPI_ClockPhaseSecondEdge : kSPI_ClockPhaseFirstEdge;
+        master_config.direction = kSPI_MsbFirst;
+
+        SPI_MasterInit(spi_address[obj->instance], &master_config, CLOCK_GetFreq(spi_clocks[obj->instance]));
+    }
+}
+
+void spi_frequency(spi_t *obj, int hz)
+{
+    SPI_MasterSetBaudRate(spi_address[obj->instance], (uint32_t)hz, CLOCK_GetFreq(spi_clocks[obj->instance]));
+}
+
+static inline int spi_readable(spi_t * obj)
+{
+    return (SPI_GetStatusFlags(spi_address[obj->instance]) & kSPI_RxBufferFullFlag);
+}
+
+int spi_master_write(spi_t *obj, int value)
+{
+    spi_transfer_t xfer = {0};
+    uint32_t rx_data;
+    SPI_Type *base = spi_address[obj->instance];
+
+    /* SPI master start transfer */
+    xfer.txData = (uint8_t *)&value;
+    xfer.rxData = (uint8_t *)&rx_data;
+    xfer.dataSize = ((base->C2 & SPI_C2_SPIMODE_MASK) >> SPI_C2_SPIMODE_SHIFT) + 1U;
+    SPI_MasterTransferBlocking(base, &xfer);
+
+    return rx_data & 0xffff;
+}
+
+int spi_master_block_write(spi_t *obj, const char *tx_buffer, int tx_length,
+                           char *rx_buffer, int rx_length, char write_fill) {
+    int total = (tx_length > rx_length) ? tx_length : rx_length;
+
+    for (int i = 0; i < total; i++) {
+        char out = (i < tx_length) ? tx_buffer[i] : write_fill;
+        char in = spi_master_write(obj, out);
+        if (i < rx_length) {
+            rx_buffer[i] = in;
+        }
+    }
+
+    return total;
+}
+
+int spi_slave_receive(spi_t *obj)
+{
+    return spi_readable(obj);
+}
+
+int spi_slave_read(spi_t *obj)
+{
+    uint32_t rx_data;
+
+    while (!spi_readable(obj));
+    rx_data = SPI_ReadData(spi_address[obj->instance]);
+
+    return rx_data & 0xffff;
+}
+
+void spi_slave_write(spi_t *obj, int value)
+{
+    SPI_Type *base = spi_address[obj->instance];
+    size_t size = ((base->C2 & SPI_C2_SPIMODE_MASK) >> SPI_C2_SPIMODE_SHIFT) + 1U;
+    SPI_WriteBlocking(spi_address[obj->instance], (uint8_t *)&value, size);
+}
+
+#endif