182 lines
5.6 KiB
C++
182 lines
5.6 KiB
C++
// ArduinoCompat/HardwareSPI.cpp
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//
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// Interface between Arduino-like SPI interface and STM32F4 Discovery and similar
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// using STM32F4xx_DSP_StdPeriph_Lib_V1.3.0
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#include <RadioHead.h>
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#if (RH_PLATFORM == RH_PLATFORM_STM32STD)
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#include <wirish.h>
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#include <HardwareSPI.h>
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#include "stm32f4xx.h"
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#include "stm32f4xx_spi.h"
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extern "C"
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{
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#include "gdb_stdio.h"
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}
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// Symbolic definitions for the SPI pins we intend to use
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// Currently we only support SPI1
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#define SPIx SPI1
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#define SPIx_CLK RCC_APB2Periph_SPI1
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#define SPIx_CLK_INIT RCC_APB2PeriphClockCmd
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#define SPIx_IRQn SPI2_IRQn
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#define SPIx_IRQHANDLER SPI2_IRQHandler
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#define SPIx_SCK_PIN GPIO_Pin_5
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#define SPIx_SCK_GPIO_PORT GPIOA
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#define SPIx_SCK_GPIO_CLK RCC_AHB1Periph_GPIOA
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#define SPIx_SCK_SOURCE GPIO_PinSource5
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#define SPIx_SCK_AF GPIO_AF_SPI1
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#define SPIx_MISO_PIN GPIO_Pin_6
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#define SPIx_MISO_GPIO_PORT GPIOA
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#define SPIx_MISO_GPIO_CLK RCC_AHB1Periph_GPIOA
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#define SPIx_MISO_SOURCE GPIO_PinSource6
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#define SPIx_MISO_AF GPIO_AF_SPI1
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#define SPIx_MOSI_PIN GPIO_Pin_7
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#define SPIx_MOSI_GPIO_PORT GPIOA
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#define SPIx_MOSI_GPIO_CLK RCC_AHB1Periph_GPIOA
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#define SPIx_MOSI_SOURCE GPIO_PinSource7
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#define SPIx_MOSI_AF GPIO_AF_SPI1
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HardwareSPI::HardwareSPI(uint32_t spiPortNumber) :
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_spiPortNumber(spiPortNumber)
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{
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}
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void HardwareSPI::begin(SPIFrequency frequency, uint32_t bitOrder, uint32_t mode)
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{
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GPIO_InitTypeDef GPIO_InitStructure;
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// NVIC_InitTypeDef NVIC_InitStructure;
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SPI_InitTypeDef SPI_InitStructure;
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/* Peripheral Clock Enable -------------------------------------------------*/
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/* Enable the SPI clock */
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RCC_APB2PeriphClockCmd(SPIx_CLK, ENABLE);
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/* Enable GPIO clocks */
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RCC_AHB1PeriphClockCmd(SPIx_SCK_GPIO_CLK | SPIx_MISO_GPIO_CLK | SPIx_MOSI_GPIO_CLK, ENABLE);
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/* SPI GPIO Configuration --------------------------------------------------*/
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/* GPIO Deinitialisation */
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GPIO_DeInit(SPIx_SCK_GPIO_PORT);
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GPIO_DeInit(SPIx_MISO_GPIO_PORT);
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GPIO_DeInit(SPIx_MOSI_GPIO_PORT);
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/* Connect SPI pins to AF5 */
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GPIO_PinAFConfig(SPIx_SCK_GPIO_PORT, SPIx_SCK_SOURCE, SPIx_SCK_AF);
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GPIO_PinAFConfig(SPIx_MISO_GPIO_PORT, SPIx_MISO_SOURCE, SPIx_MISO_AF);
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GPIO_PinAFConfig(SPIx_MOSI_GPIO_PORT, SPIx_MOSI_SOURCE, SPIx_MOSI_AF);
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
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GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
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GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
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GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_DOWN;
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/* SPI SCK pin configuration */
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GPIO_InitStructure.GPIO_Pin = SPIx_SCK_PIN;
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GPIO_Init(SPIx_SCK_GPIO_PORT, &GPIO_InitStructure);
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/* SPI MISO pin configuration */
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GPIO_InitStructure.GPIO_Pin = SPIx_MISO_PIN;
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GPIO_Init(SPIx_MISO_GPIO_PORT, &GPIO_InitStructure);
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/* SPI MOSI pin configuration */
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GPIO_InitStructure.GPIO_Pin = SPIx_MOSI_PIN;
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GPIO_Init(SPIx_MOSI_GPIO_PORT, &GPIO_InitStructure);
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/* SPI configuration -------------------------------------------------------*/
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SPI_I2S_DeInit(SPIx);
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SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
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SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
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if (mode == SPI_MODE0)
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{
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SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low;
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SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge;
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}
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else if (mode == SPI_MODE1)
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{
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SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low;
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SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;
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}
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else if (mode == SPI_MODE2)
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{
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SPI_InitStructure.SPI_CPOL = SPI_CPOL_High;
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SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge;
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}
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else if (mode == SPI_MODE3)
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{
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SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low;
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SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;
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}
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SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
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// Prescaler is divided into PCLK2 (84MHz) to get SPI baud rate/clock speed
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// 256 => 328.125kHz
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// 128 => 656.25kHz
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// 64 => 1.3125MHz
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// 32 => 2.625MHz
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// 16 => 5.25MHz
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// 8 => 10.5MHz
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// 4 => 21.0MHz
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switch (frequency)
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{
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case SPI_21_0MHZ:
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SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_4;
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break;
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case SPI_10_5MHZ:
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SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_8;
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break;
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case SPI_5_25MHZ:
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SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_16;
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break;
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case SPI_2_625MHZ:
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default:
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SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_32;
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break;
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case SPI_1_3125MHZ:
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SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_64;
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break;
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case SPI_656_25KHZ:
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SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_128;
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break;
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case SPI_328_125KHZ:
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SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_256;
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break;
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}
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if (bitOrder == LSBFIRST)
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SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_LSB;
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else
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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_InitStructure.SPI_Mode = SPI_Mode_Master;
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/* Initializes the SPI communication */
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SPI_Init(SPIx, &SPI_InitStructure);
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/* Enable SPI1 */
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SPI_Cmd(SPIx, ENABLE);
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}
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void HardwareSPI::end(void)
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{
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SPI_DeInit(SPIx);
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}
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uint8_t HardwareSPI::transfer(uint8_t data)
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{
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// Wait for TX empty
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while (SPI_I2S_GetFlagStatus(SPIx, SPI_I2S_FLAG_TXE) == RESET)
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;
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SPI_SendData(SPIx, data);
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// Wait for RX not empty
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while (SPI_I2S_GetFlagStatus(SPIx, SPI_I2S_FLAG_RXNE) == RESET)
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;
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return SPI_ReceiveData(SPIx);
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}
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#endif
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