Diff: targets/hal/TARGET_STM/TARGET_STM32F0/spi_api.c

Revision:

638:e94dc43c7733

Parent:

636:cdb71f051ab2

--- a/targets/hal/TARGET_STM/TARGET_STM32F0/spi_api.c	Thu Apr 14 06:45:56 2016 +0000
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,282 +0,0 @@
-/* mbed Microcontroller Library
- *******************************************************************************
- * Copyright (c) 2015, STMicroelectronics
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
- *
- * 1. Redistributions of source code must retain the above copyright notice,
- *    this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright notice,
- *    this list of conditions and the following disclaimer in the documentation
- *    and/or other materials provided with the distribution.
- * 3. Neither the name of STMicroelectronics nor the names of its contributors
- *    may be used to endorse or promote products derived from this software
- *    without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
- * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
- * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
- * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
- * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- *******************************************************************************
- */
-#include "mbed_assert.h"
-#include "spi_api.h"
-
-#if DEVICE_SPI
-
-#include <math.h>
-#include "cmsis.h"
-#include "pinmap.h"
-#include "PeripheralPins.h"
-
-static SPI_HandleTypeDef SpiHandle;
-
-static void init_spi(spi_t *obj) {
-    SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
-
-    __HAL_SPI_DISABLE(&SpiHandle);
-
-    SpiHandle.Init.Mode              = obj->mode;
-    SpiHandle.Init.BaudRatePrescaler = obj->br_presc;
-    SpiHandle.Init.Direction         = SPI_DIRECTION_2LINES;
-    SpiHandle.Init.CLKPhase          = obj->cpha;
-    SpiHandle.Init.CLKPolarity       = obj->cpol;
-    SpiHandle.Init.CRCCalculation    = SPI_CRCCALCULATION_DISABLED;
-    SpiHandle.Init.CRCPolynomial     = 7;
-    SpiHandle.Init.DataSize          = obj->bits;
-    SpiHandle.Init.FirstBit          = SPI_FIRSTBIT_MSB;
-    SpiHandle.Init.NSS               = obj->nss;
-    SpiHandle.Init.TIMode            = SPI_TIMODE_DISABLED;
-
-    HAL_SPI_Init(&SpiHandle);
-
-    __HAL_SPI_ENABLE(&SpiHandle);
-}
-
-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 = (SPIName)pinmap_merge(spi_data, spi_cntl);
-    MBED_ASSERT(obj->spi != (SPIName)NC);
-
-    // Enable SPI clock
-    if (obj->spi == SPI_1) {
-        __SPI1_CLK_ENABLE();
-    }
-#if defined(SPI2_BASE)
-    if (obj->spi == SPI_2) {
-        __SPI2_CLK_ENABLE();
-    }
-#endif
-
-    // Configure the SPI pins
-    pinmap_pinout(mosi, PinMap_SPI_MOSI);
-    pinmap_pinout(miso, PinMap_SPI_MISO);
-    pinmap_pinout(sclk, PinMap_SPI_SCLK);
-
-    // Save new values
-    obj->bits = SPI_DATASIZE_8BIT;
-    obj->cpol = SPI_POLARITY_LOW;
-    obj->cpha = SPI_PHASE_1EDGE;
-    obj->br_presc = SPI_BAUDRATEPRESCALER_256;
-
-    obj->pin_miso = miso;
-    obj->pin_mosi = mosi;
-    obj->pin_sclk = sclk;
-    obj->pin_ssel = ssel;
-
-    if (ssel != NC) {
-        pinmap_pinout(ssel, PinMap_SPI_SSEL);
-    } else {
-        obj->nss = SPI_NSS_SOFT;
-    }
-
-    init_spi(obj);
-}
-
-void spi_free(spi_t *obj) {
-    // Reset SPI and disable clock
-    if (obj->spi == SPI_1) {
-        __SPI1_FORCE_RESET();
-        __SPI1_RELEASE_RESET();
-        __SPI1_CLK_DISABLE();
-    }
-
-#if defined(SPI2_BASE)
-    if (obj->spi == SPI_2) {
-        __SPI2_FORCE_RESET();
-        __SPI2_RELEASE_RESET();
-        __SPI2_CLK_DISABLE();
-    }
-#endif
-
-    // Configure GPIOs
-    pin_function(obj->pin_miso, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
-    pin_function(obj->pin_mosi, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
-    pin_function(obj->pin_sclk, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
-    pin_function(obj->pin_ssel, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
-}
-
-void spi_format(spi_t *obj, int bits, int mode, int slave) {
-    // Save new values
-    if (bits == 16) {
-        obj->bits = SPI_DATASIZE_16BIT;
-    } else {
-        obj->bits = SPI_DATASIZE_8BIT;
-    }
-
-    switch (mode) {
-        case 0:
-            obj->cpol = SPI_POLARITY_LOW;
-            obj->cpha = SPI_PHASE_1EDGE;
-            break;
-        case 1:
-            obj->cpol = SPI_POLARITY_LOW;
-            obj->cpha = SPI_PHASE_2EDGE;
-            break;
-        case 2:
-            obj->cpol = SPI_POLARITY_HIGH;
-            obj->cpha = SPI_PHASE_1EDGE;
-            break;
-        default:
-            obj->cpol = SPI_POLARITY_HIGH;
-            obj->cpha = SPI_PHASE_2EDGE;
-            break;
-    }
-
-    if (obj->nss != SPI_NSS_SOFT) {
-        obj->nss = (slave) ? SPI_NSS_HARD_INPUT : SPI_NSS_HARD_OUTPUT;
-    }
-
-    obj->mode = (slave) ? SPI_MODE_SLAVE : SPI_MODE_MASTER;
-
-    init_spi(obj);
-}
-
-void spi_frequency(spi_t *obj, int hz) {
-    // Note: The frequencies are obtained with SPI clock = 48 MHz (APB clock)
-    if (hz < 375000) {
-        obj->br_presc = SPI_BAUDRATEPRESCALER_256; // 188 kHz
-    } else if ((hz >= 375000) && (hz < 750000)) {
-        obj->br_presc = SPI_BAUDRATEPRESCALER_128; // 375 kHz
-    } else if ((hz >= 750000) && (hz < 1000000)) {
-        obj->br_presc = SPI_BAUDRATEPRESCALER_64; // 750 kHz
-    } else if ((hz >= 1000000) && (hz < 3000000)) {
-        obj->br_presc = SPI_BAUDRATEPRESCALER_32; // 1.5 MHz
-    } else if ((hz >= 3000000) && (hz < 6000000)) {
-        obj->br_presc = SPI_BAUDRATEPRESCALER_16; // 3 MHz
-    } else if ((hz >= 6000000) && (hz < 12000000)) {
-        obj->br_presc = SPI_BAUDRATEPRESCALER_8; // 6 MHz
-    } else if ((hz >= 12000000) && (hz < 24000000)) {
-        obj->br_presc = SPI_BAUDRATEPRESCALER_4; // 12 MHz
-    } else { // >= 24000000
-        obj->br_presc = SPI_BAUDRATEPRESCALER_2; // 24 MHz
-    }
-
-    init_spi(obj);
-}
-
-static inline int ssp_readable(spi_t *obj) {
-    int status;
-    SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
-    // Check if data is received
-    status = ((__HAL_SPI_GET_FLAG(&SpiHandle, SPI_FLAG_RXNE) != RESET) ? 1 : 0);
-    return status;
-}
-
-static inline int ssp_writeable(spi_t *obj) {
-    int status;
-    SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
-    // Check if data is transmitted
-    status = ((__HAL_SPI_GET_FLAG(&SpiHandle, SPI_FLAG_TXE) != RESET) ? 1 : 0);
-    return status;
-}
-
-static inline void ssp_write(spi_t *obj, int value) {
-    SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
-    while (!ssp_writeable(obj));
-    if (obj->bits == SPI_DATASIZE_8BIT) {
-        // Force 8-bit access to the data register
-        uint8_t *p_spi_dr = 0;
-        p_spi_dr = (uint8_t *) & (spi->DR);
-        *p_spi_dr = (uint8_t)value;
-    } else { // SPI_DATASIZE_16BIT
-        spi->DR = (uint16_t)value;
-    }
-}
-
-static inline int ssp_read(spi_t *obj) {
-    SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
-    while (!ssp_readable(obj));
-    if (obj->bits == SPI_DATASIZE_8BIT) {
-        // Force 8-bit access to the data register
-        uint8_t *p_spi_dr = 0;
-        p_spi_dr = (uint8_t *) & (spi->DR);
-        return (int)(*p_spi_dr);
-    } else {
-        return (int)spi->DR;
-    }
-}
-
-static inline int ssp_busy(spi_t *obj) {
-    int status;
-    SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
-    status = ((__HAL_SPI_GET_FLAG(&SpiHandle, SPI_FLAG_BSY) != RESET) ? 1 : 0);
-    return status;
-}
-
-int spi_master_write(spi_t *obj, int value) {
-    ssp_write(obj, value);
-    return ssp_read(obj);
-}
-
-int spi_slave_receive(spi_t *obj) {
-    return ((ssp_readable(obj) && !ssp_busy(obj)) ? 1 : 0);
-};
-
-int spi_slave_read(spi_t *obj) {
-    SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
-    while (!ssp_readable(obj));
-    if (obj->bits == SPI_DATASIZE_8BIT) {
-        // Force 8-bit access to the data register
-        uint8_t *p_spi_dr = 0;
-        p_spi_dr = (uint8_t *) & (spi->DR);
-        return (int)(*p_spi_dr);
-    } else {
-        return (int)spi->DR;
-    }
-}
-
-void spi_slave_write(spi_t *obj, int value) {
-    SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
-    while (!ssp_writeable(obj));
-    if (obj->bits == SPI_DATASIZE_8BIT) {
-        // Force 8-bit access to the data register
-        uint8_t *p_spi_dr = 0;
-        p_spi_dr = (uint8_t *) & (spi->DR);
-        *p_spi_dr = (uint8_t)value;
-    } else { // SPI_DATASIZE_16BIT
-        spi->DR = (uint16_t)value;
-    }
-}
-
-int spi_busy(spi_t *obj) {
-    return ssp_busy(obj);
-}
-
-#endif