Diff: targets/hal/TARGET_Freescale/TARGET_KL05Z/spi_api.c

Revision:

43:b3acfef78949

Parent:

42:7ca0bbba899b

--- a/targets/hal/TARGET_Freescale/TARGET_KL05Z/spi_api.c	Sun Oct 27 16:30:04 2013 +0000
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,169 +0,0 @@
-/* mbed Microcontroller Library
- * Copyright (c) 2006-2013 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 "spi_api.h"
-
-#include <math.h>
-
-#include "cmsis.h"
-#include "pinmap.h"
-#include "error.h"
-
-static const PinMap PinMap_SPI_SCLK[] = {
-    {PTB0, SPI_0, 3},
-    {NC  , NC   , 0}
-};
-
-static const PinMap PinMap_SPI_MOSI[] = {
-    {PTA7, SPI_0, 3},
-    {NC  , NC   , 0}
-};
-
-static const PinMap PinMap_SPI_MISO[] = {
-    {PTA6, SPI_0, 3},
-    {NC  , NC   , 0}
-};
-
-static const PinMap PinMap_SPI_SSEL[] = {
-    {PTA5, SPI_0, 3},
-    {NC  , NC   , 0}
-};
-
-void spi_init(spi_t *obj, PinName mosi, PinName miso, PinName sclk, PinName ssel) {
-    // determine the SPI to use
-    SPIName spi_mosi = (SPIName)pinmap_peripheral(mosi, PinMap_SPI_MOSI);
-    SPIName spi_miso = (SPIName)pinmap_peripheral(miso, PinMap_SPI_MISO);
-    SPIName spi_sclk = (SPIName)pinmap_peripheral(sclk, PinMap_SPI_SCLK);
-    SPIName spi_ssel = (SPIName)pinmap_peripheral(ssel, PinMap_SPI_SSEL);
-    SPIName spi_data = (SPIName)pinmap_merge(spi_mosi, spi_miso);
-    SPIName spi_cntl = (SPIName)pinmap_merge(spi_sclk, spi_ssel);
-
-    obj->spi = (SPI_Type*)pinmap_merge(spi_data, spi_cntl);
-    if ((int)obj->spi == NC) {
-        error("SPI pinout mapping failed");
-    }
-
-    // enable power and clocking
-    switch ((int)obj->spi) {
-        case SPI_0:
-          SIM->SCGC5 |= (SIM_SCGC5_PORTA_MASK | SIM_SCGC5_PORTB_MASK);
-          SIM->SCGC4 |= SIM_SCGC4_SPI0_MASK;
-          break;
-    }
-
-    // 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_frequency(obj, 1000000);
-
-    // enable SPI
-    obj->spi->C1 |= SPI_C1_SPE_MASK;
-
-    // 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) {
-    if (bits != 8) {
-        error("Only 8bits SPI supported");
-    }
-
-    if ((mode < 0) || (mode > 3)) {
-        error("SPI mode unsupported");
-    }
-
-    uint8_t polarity = (mode & 0x2) ? 1 : 0;
-    uint8_t phase = (mode & 0x1) ? 1 : 0;
-    uint8_t c1_data = ((!slave) << 4) | (polarity << 3) | (phase << 2);
-
-    // clear MSTR, CPOL and CPHA bits
-    obj->spi->C1 &= ~(0x7 << 2);
-
-    // write new value
-    obj->spi->C1 |= c1_data;
-}
-
-void spi_frequency(spi_t *obj, int hz) {
-    uint32_t error = 0;
-    uint32_t p_error = 0xffffffff;
-    uint32_t ref = 0;
-    uint8_t  spr = 0;
-    uint8_t  ref_spr = 0;
-    uint8_t  ref_prescaler = 0;
-
-    // bus clk
-    uint32_t PCLK = 23986176u;
-    uint8_t prescaler = 1;
-    uint8_t divisor = 2;
-
-    for (prescaler = 1; prescaler <= 8; prescaler++) {
-        divisor = 2;
-        for (spr = 0; spr <= 8; spr++) {
-            ref = PCLK / (prescaler*divisor);
-            error = (ref > hz) ? ref - hz : hz - ref;
-            if (error < p_error) {
-                ref_spr = spr;
-                ref_prescaler = prescaler - 1;
-                p_error = error;
-            }
-            divisor *= 2;
-        }
-    }
-
-    // set SPPR and SPR
-    obj->spi->BR = ((ref_prescaler & 0x7) << 4) | (ref_spr & 0xf);
-}
-
-static inline int spi_writeable(spi_t * obj) {
-    return (obj->spi->S & SPI_S_SPTEF_MASK) ? 1 : 0;
-}
-
-static inline int spi_readable(spi_t * obj) {
-    return (obj->spi->S & SPI_S_SPRF_MASK) ? 1 : 0;
-}
-
-int spi_master_write(spi_t *obj, int value) {
-    // wait tx buffer empty
-    while(!spi_writeable(obj));
-    obj->spi->D = (value & 0xff);
-
-    // wait rx buffer full
-    while (!spi_readable(obj));
-    return obj->spi->D & 0xff;
-}
-
-int spi_slave_receive(spi_t *obj) {
-    return spi_readable(obj);
-}
-
-int spi_slave_read(spi_t *obj) {
-    return obj->spi->D;
-}
-
-void spi_slave_write(spi_t *obj, int value) {
-    while (!spi_writeable(obj));
-    obj->spi->D = value;
-}