mbed library sources
Dependents: frdm_kl05z_gpio_test
Fork of mbed-src by
Diff: targets/hal/TARGET_STM/TARGET_NUCLEO_F302R8/spi_api.c
- Revision:
- 135:067cc8ba23da
- Parent:
- 125:23cc3068a9e4
- Child:
- 198:322bca33c29c
diff -r 4fb64af58963 -r 067cc8ba23da targets/hal/TARGET_STM/TARGET_NUCLEO_F302R8/spi_api.c --- a/targets/hal/TARGET_STM/TARGET_NUCLEO_F302R8/spi_api.c Tue Mar 25 09:30:07 2014 +0000 +++ b/targets/hal/TARGET_STM/TARGET_NUCLEO_F302R8/spi_api.c Tue Mar 25 10:15:07 2014 +0000 @@ -74,19 +74,19 @@ SPI_Cmd(spi, DISABLE); - SPI_InitStructure.SPI_Mode = obj->mode; - SPI_InitStructure.SPI_NSS = obj->nss; - SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex; - SPI_InitStructure.SPI_DataSize = obj->bits; - SPI_InitStructure.SPI_CPOL = obj->cpol; - SPI_InitStructure.SPI_CPHA = obj->cpha; + SPI_InitStructure.SPI_Mode = obj->mode; + SPI_InitStructure.SPI_NSS = obj->nss; + SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex; + SPI_InitStructure.SPI_DataSize = obj->bits; + SPI_InitStructure.SPI_CPOL = obj->cpol; + SPI_InitStructure.SPI_CPHA = obj->cpha; SPI_InitStructure.SPI_BaudRatePrescaler = obj->br_presc; - SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB; - SPI_InitStructure.SPI_CRCPolynomial = 7; + SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB; + SPI_InitStructure.SPI_CRCPolynomial = 7; SPI_Init(spi, &SPI_InitStructure); - SPI_RxFIFOThresholdConfig(spi, SPI_RxFIFOThreshold_QF); - + SPI_RxFIFOThresholdConfig(spi, SPI_RxFIFOThreshold_QF); + SPI_Cmd(spi, ENABLE); } @@ -96,40 +96,39 @@ 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); - + if (obj->spi == (SPIName)NC) { error("SPI pinout mapping failed"); } - + // Enable SPI clock if (obj->spi == SPI_2) { - RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2, ENABLE); + RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2, ENABLE); } if (obj->spi == SPI_3) { - RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI3, ENABLE); + RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI3, 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_8b; obj->cpol = SPI_CPOL_Low; obj->cpha = SPI_CPHA_1Edge; obj->br_presc = SPI_BaudRatePrescaler_256; - + if (ssel == NC) { // Master obj->mode = SPI_Mode_Master; obj->nss = SPI_NSS_Soft; - } - else { // Slave + } else { // Slave pinmap_pinout(ssel, PinMap_SPI_SSEL); obj->mode = SPI_Mode_Slave; obj->nss = SPI_NSS_Soft; @@ -143,71 +142,62 @@ SPI_I2S_DeInit(spi); } -void spi_format(spi_t *obj, int bits, int mode, int slave) { +void spi_format(spi_t *obj, int bits, int mode, int slave) { // Save new values if (bits == 8) { obj->bits = SPI_DataSize_8b; - } - else { + } else { obj->bits = SPI_DataSize_16b; } - + switch (mode) { case 0: - obj->cpol = SPI_CPOL_Low; - obj->cpha = SPI_CPHA_1Edge; - break; + obj->cpol = SPI_CPOL_Low; + obj->cpha = SPI_CPHA_1Edge; + break; case 1: - obj->cpol = SPI_CPOL_Low; - obj->cpha = SPI_CPHA_2Edge; - break; + obj->cpol = SPI_CPOL_Low; + obj->cpha = SPI_CPHA_2Edge; + break; case 2: - obj->cpol = SPI_CPOL_High; - obj->cpha = SPI_CPHA_1Edge; - break; + obj->cpol = SPI_CPOL_High; + obj->cpha = SPI_CPHA_1Edge; + break; default: - obj->cpol = SPI_CPOL_High; - obj->cpha = SPI_CPHA_2Edge; - break; + obj->cpol = SPI_CPOL_High; + obj->cpha = SPI_CPHA_2Edge; + break; } - + if (slave == 0) { obj->mode = SPI_Mode_Master; obj->nss = SPI_NSS_Soft; - } - else { + } else { obj->mode = SPI_Mode_Slave; - obj->nss = SPI_NSS_Hard; + obj->nss = SPI_NSS_Hard; } - + init_spi(obj); } void spi_frequency(spi_t *obj, int hz) { - // Note: The frequencies are obtained with SPI2 clock = 32 MHz (APB1 clock) + // Values depend of PCLK1: 32 MHz if HSI is used, 36 MHz if HSE is used 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 + obj->br_presc = SPI_BaudRatePrescaler_256; // 125 kHz - 141 kHz + } else if ((hz >= 250000) && (hz < 500000)) { + obj->br_presc = SPI_BaudRatePrescaler_128; // 250 kHz - 280 kHz + } else if ((hz >= 500000) && (hz < 1000000)) { + obj->br_presc = SPI_BaudRatePrescaler_64; // 500 kHz - 560 kHz + } else if ((hz >= 1000000) && (hz < 2000000)) { + obj->br_presc = SPI_BaudRatePrescaler_32; // 1 MHz - 1.13 MHz + } else if ((hz >= 2000000) && (hz < 4000000)) { + obj->br_presc = SPI_BaudRatePrescaler_16; // 2 MHz - 2.25 MHz + } else if ((hz >= 4000000) && (hz < 8000000)) { + obj->br_presc = SPI_BaudRatePrescaler_8; // 4 MHz - 4.5 MHz + } else if ((hz >= 8000000) && (hz < 16000000)) { + obj->br_presc = SPI_BaudRatePrescaler_4; // 8 MHz - 9 MHz + } else { // >= 16000000 + obj->br_presc = SPI_BaudRatePrescaler_2; // 16 MHz - 18 MHz } init_spi(obj); } @@ -217,7 +207,7 @@ SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi); // Check if data is received status = ((SPI_I2S_GetFlagStatus(spi, SPI_I2S_FLAG_RXNE) != RESET) ? 1 : 0); - return status; + return status; } static inline int ssp_writeable(spi_t *obj) { @@ -229,23 +219,21 @@ } static inline void ssp_write(spi_t *obj, int value) { - SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi); + SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi); while (!ssp_writeable(obj)); if (obj->bits == SPI_DataSize_8b) { SPI_SendData8(spi, (uint8_t)value); - } - else { + } else { SPI_I2S_SendData16(spi, (uint16_t)value); } } static inline int ssp_read(spi_t *obj) { - SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi); + SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi); while (!ssp_readable(obj)); if (obj->bits == SPI_DataSize_8b) { return (int)SPI_ReceiveData8(spi); - } - else { + } else { return (int)SPI_I2S_ReceiveData16(spi); } } @@ -270,19 +258,17 @@ SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi); if (obj->bits == SPI_DataSize_8b) { return (int)SPI_ReceiveData8(spi); - } - else { + } else { return (int)SPI_I2S_ReceiveData16(spi); } } void spi_slave_write(spi_t *obj, int value) { - SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi); - while (!ssp_writeable(obj)); + SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi); + while (!ssp_writeable(obj)); if (obj->bits == SPI_DataSize_8b) { SPI_SendData8(spi, (uint8_t)value); - } - else { + } else { SPI_I2S_SendData16(spi, (uint16_t)value); } }