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Diffstat (limited to 'tmk_core/tool/mbed/mbed-sdk/libraries/mbed/targets/hal/TARGET_STM/TARGET_STM32L0/spi_api.c')
-rw-r--r--tmk_core/tool/mbed/mbed-sdk/libraries/mbed/targets/hal/TARGET_STM/TARGET_STM32L0/spi_api.c269
1 files changed, 269 insertions, 0 deletions
diff --git a/tmk_core/tool/mbed/mbed-sdk/libraries/mbed/targets/hal/TARGET_STM/TARGET_STM32L0/spi_api.c b/tmk_core/tool/mbed/mbed-sdk/libraries/mbed/targets/hal/TARGET_STM/TARGET_STM32L0/spi_api.c
new file mode 100644
index 0000000000..3bca3770cb
--- /dev/null
+++ b/tmk_core/tool/mbed/mbed-sdk/libraries/mbed/targets/hal/TARGET_STM/TARGET_STM32L0/spi_api.c
@@ -0,0 +1,269 @@
+/* mbed Microcontroller Library
+ *******************************************************************************
+ * Copyright (c) 2014, 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 (obj->spi == SPI_2) {
+ __SPI2_CLK_ENABLE();
+ }
+
+ // 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) { // SW NSS Master mode
+ obj->mode = SPI_MODE_MASTER;
+ obj->nss = SPI_NSS_SOFT;
+ } else { // Slave
+ pinmap_pinout(ssel, PinMap_SPI_SSEL);
+ obj->mode = SPI_MODE_SLAVE;
+ obj->nss = SPI_NSS_HARD_INPUT;
+ }
+
+ 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 (obj->spi == SPI_2) {
+ __SPI2_FORCE_RESET();
+ __SPI2_RELEASE_RESET();
+ __SPI2_CLK_DISABLE();
+ }
+
+ // Configure GPIO
+ 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 (slave == 0) {
+ obj->mode = SPI_MODE_MASTER;
+ obj->nss = SPI_NSS_SOFT;
+ } else {
+ obj->mode = SPI_MODE_SLAVE;
+ obj->nss = SPI_NSS_HARD_INPUT;
+ }
+
+ init_spi(obj);
+}
+
+void spi_frequency(spi_t *obj, int hz)
+{
+ // Note: The frequencies are obtained with SPI1 clock = 32 MHz (APB2 clock)
+ if (hz < 250000) {
+ obj->br_presc = SPI_BAUDRATEPRESCALER_256; // 125 kHz
+ } else if ((hz >= 250000) && (hz < 500000)) {
+ obj->br_presc = SPI_BAUDRATEPRESCALER_128; // 250 kHz
+ } else if ((hz >= 500000) && (hz < 1000000)) {
+ obj->br_presc = SPI_BAUDRATEPRESCALER_64; // 500 kHz
+ } else if ((hz >= 1000000) && (hz < 2000000)) {
+ obj->br_presc = SPI_BAUDRATEPRESCALER_32; // 1 MHz
+ } else if ((hz >= 2000000) && (hz < 4000000)) {
+ obj->br_presc = SPI_BAUDRATEPRESCALER_16; // 2 MHz
+ } else if ((hz >= 4000000) && (hz < 8000000)) {
+ obj->br_presc = SPI_BAUDRATEPRESCALER_8; // 4 MHz
+ } else if ((hz >= 8000000) && (hz < 16000000)) {
+ obj->br_presc = SPI_BAUDRATEPRESCALER_4; // 8 MHz
+ } else { // >= 16000000
+ obj->br_presc = SPI_BAUDRATEPRESCALER_2; // 16 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));
+ spi->DR = (uint16_t)value;
+}
+
+static inline int ssp_read(spi_t *obj)
+{
+ SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
+ while (!ssp_readable(obj));
+ 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) ? 1 : 0);
+};
+
+int spi_slave_read(spi_t *obj)
+{
+ SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
+ while (!ssp_readable(obj));
+ return (int)spi->DR;
+}
+
+void spi_slave_write(spi_t *obj, int value)
+{
+ SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
+ while (!ssp_writeable(obj));
+ spi->DR = (uint16_t)value;
+}
+
+int spi_busy(spi_t *obj)
+{
+ return ssp_busy(obj);
+}
+
+#endif
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