#include "Spi.h"
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void Spi_Init(void)
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{
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SPI_InitTypeDef SPI_InitStructure;
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GPIO_InitTypeDef GPIO_InitStructure;
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/* Enable GPIO clock */
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RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_AFIO, ENABLE);
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/* Enable SPI clock */
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RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);
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/* SPI GPIO setup */
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// SPIx SCK and MOSI pin setup
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GPIO_InitStructure.GPIO_Pin = SPIx_SCK | SPIx_MOSI;
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
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GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
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GPIO_Init(SPIx_GPIO, &GPIO_InitStructure);
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// SPIx MISO pin setup
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GPIO_InitStructure.GPIO_Pin = SPIx_MISO;
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
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GPIO_Init(SPIx_GPIO, &GPIO_InitStructure);
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// SPIx CS pin setup
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GPIO_InitStructure.GPIO_Pin = SPIx_CS;
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
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GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
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GPIO_Init(SPIx_CS_GPIO, &GPIO_InitStructure);
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// Set CS high
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GPIO_SetBits(SPIx_CS_GPIO, SPIx_CS);
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SPI_I2S_DeInit(SPIx);
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// SPIx Mode setup
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SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
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SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
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SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
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SPI_InitStructure.SPI_CPOL = SPIx_CPOL;
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SPI_InitStructure.SPI_CPHA = SPIx_CPHA;
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SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
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SPI_InitStructure.SPI_BaudRatePrescaler = SPIx_PRESCALER_SLOW;
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SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
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SPI_InitStructure.SPI_CRCPolynomial = 7;
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SPI_Init(SPIx, &SPI_InitStructure);
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// Disable SPIx SS Output
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SPI_SSOutputCmd(SPIx, DISABLE);
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// Enable SPIx
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SPI_Cmd(SPIx, ENABLE);
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}
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void Spi_ChangePrescaler(uint16_t scaling_factor)
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{
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uint16_t tmpreg = 0;
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/* Get the SPIx CR1 value */
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tmpreg = SPIx->CR1;
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/*clear the scaling bits*/
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tmpreg &= 0xFFC7;
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/*set the scaling bits*/
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tmpreg |= scaling_factor;
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/* Write to SPIx CR1 */
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SPIx->CR1 = tmpreg;
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}
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