mbed library sources
Fork of mbed-src by
Diff: targets/hal/TARGET_STM/TARGET_DISCO_L053C8/spi_api.c
- Revision:
- 376:cb4d9db17537
- Child:
- 439:c4382fcbbaed
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/targets/hal/TARGET_STM/TARGET_DISCO_L053C8/spi_api.c Fri Oct 31 11:00:10 2014 +0000 @@ -0,0 +1,287 @@ +/* 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" + +static const PinMap PinMap_SPI_MOSI[] = { + {PA_7, SPI_1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF0_SPI1)}, + {PA_12, SPI_1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF0_SPI1)}, + {PB_5, SPI_1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF0_SPI1)}, + {PB_15, SPI_2, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF0_SPI2)}, + {PC_3, SPI_2, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF2_SPI2)}, + {NC, NC, 0} +}; + +static const PinMap PinMap_SPI_MISO[] = { + {PA_6, SPI_1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF0_SPI1)}, + {PA_11, SPI_1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF0_SPI1)}, + {PB_4, SPI_1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF0_SPI1)}, + {PB_14, SPI_2, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF0_SPI2)}, + {PC_2, SPI_2, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF2_SPI2)}, + {NC, NC, 0} +}; + +static const PinMap PinMap_SPI_SCLK[] = { + {PA_5, SPI_1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF0_SPI1)}, + {PB_3, SPI_1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF0_SPI1)}, + {PB_10, SPI_2, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF5_SPI2)}, + {PB_13, SPI_2, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF0_SPI2)}, + {NC, NC, 0} +}; + +static const PinMap PinMap_SPI_SSEL[] = { + {PA_4, SPI_1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF0_SPI1)}, + {PA_15, SPI_1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF0_SPI1)}, + {PB_9, SPI_2, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF5_SPI2)}, + {PB_12, SPI_2, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF0_SPI2)}, + {NC, NC, 0} +}; + +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