351 lines
9.8 KiB
C
351 lines
9.8 KiB
C
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/*
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* Copyright (c) 2006-2021, RT-Thread Development Team
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Change Logs:
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* Date Author Notes
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* 2020-01-09 shelton first version
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*/
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#include <board.h>
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#include "drv_spi.h"
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#ifdef RT_USING_SPI
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#if !defined(BSP_USING_SPI1) && !defined(BSP_USING_SPI2) && \
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!defined(BSP_USING_SPI3) && !defined(BSP_USING_SPI4)
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#error "Please define at least one SPIx"
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#endif
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//#define DEBUG
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#define ARR_LEN(__N) (sizeof(__N) / sizeof(__N[0]))
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#ifdef DEBUG
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#define DEBUG_PRINTF(...) rt_kprintf(__VA_ARGS__)
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#else
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#define DEBUG_PRINTF(...)
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#endif
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/* private rt-thread spi ops function */
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static rt_err_t configure(struct rt_spi_device* device, struct rt_spi_configuration* configuration);
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static rt_uint32_t xfer(struct rt_spi_device* device, struct rt_spi_message* message);
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static struct rt_spi_ops n32_spi_ops =
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{
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configure,
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xfer
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};
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/**
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* Attach the spi device to SPI bus, this function must be used after initialization.
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*/
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rt_err_t rt_hw_spi_device_attach(const char *bus_name, const char *device_name, GPIO_Module *cs_gpiox, uint16_t cs_gpio_pin)
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{
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RT_ASSERT(bus_name != RT_NULL);
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RT_ASSERT(device_name != RT_NULL);
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rt_err_t result;
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struct rt_spi_device *spi_device;
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struct n32_spi_cs *cs_pin;
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/* initialize the cs pin && select the slave*/
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GPIO_InitType GPIO_InitStruct;
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GPIO_InitStruct.Pin = cs_gpio_pin;
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GPIO_InitStruct.GPIO_Mode = GPIO_Mode_Out_PP;
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GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
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GPIO_InitPeripheral(cs_gpiox, &GPIO_InitStruct);
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GPIO_SetBits(cs_gpiox, cs_gpio_pin);
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/* attach the device to spi bus*/
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spi_device = (struct rt_spi_device *)rt_malloc(sizeof(struct rt_spi_device));
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RT_ASSERT(spi_device != RT_NULL);
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cs_pin = (struct n32_spi_cs *)rt_malloc(sizeof(struct n32_spi_cs));
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RT_ASSERT(cs_pin != RT_NULL);
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cs_pin->GPIOx = cs_gpiox;
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cs_pin->GPIO_Pin = cs_gpio_pin;
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result = rt_spi_bus_attach_device(spi_device, device_name, bus_name, (void *)cs_pin);
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if (result != RT_EOK)
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{
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DEBUG_PRINTF("%s attach to %s faild, %d\n", device_name, bus_name, result);
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}
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RT_ASSERT(result == RT_EOK);
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DEBUG_PRINTF("%s attach to %s done", device_name, bus_name);
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return result;
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}
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static rt_err_t configure(struct rt_spi_device* device,
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struct rt_spi_configuration* configuration)
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{
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struct rt_spi_bus * spi_bus = (struct rt_spi_bus *)device->bus;
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struct n32_spi *spi_instance = (struct n32_spi *)spi_bus->parent.user_data;
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SPI_InitType SPI_InitStruct;
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RT_ASSERT(device != RT_NULL);
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RT_ASSERT(configuration != RT_NULL);
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n32_msp_spi_init(spi_instance->config->spix);
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/* data_width */
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if(configuration->data_width <= 8)
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{
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SPI_InitStruct.DataLen = SPI_DATA_SIZE_8BITS;
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}
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else if(configuration->data_width <= 16)
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{
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SPI_InitStruct.DataLen = SPI_DATA_SIZE_16BITS;
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}
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else
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{
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return RT_EIO;
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}
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/* baudrate */
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{
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uint32_t spi_apb_clock;
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uint32_t max_hz;
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RCC_ClocksType RCC_Clocks;
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max_hz = configuration->max_hz;
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RCC_GetClocksFreqValue(&RCC_Clocks);
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DEBUG_PRINTF("sys freq: %d\n", RCC_Clocks.SysclkFreq);
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DEBUG_PRINTF("max freq: %d\n", max_hz);
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if (spi_instance->config->spix == SPI1)
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{
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spi_apb_clock = RCC_Clocks.Pclk2Freq;
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DEBUG_PRINTF("pclk2 freq: %d\n", RCC_Clocks.Pclk2Freq);
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}
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else
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{
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spi_apb_clock = RCC_Clocks.Pclk1Freq;
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DEBUG_PRINTF("pclk1 freq: %d\n", RCC_Clocks.Pclk1Freq);
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}
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if(max_hz >= spi_apb_clock/2)
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{
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SPI_InitStruct.BaudRatePres = SPI_BR_PRESCALER_2;
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}
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else if (max_hz >= spi_apb_clock/4)
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{
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SPI_InitStruct.BaudRatePres = SPI_BR_PRESCALER_4;
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}
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else if (max_hz >= spi_apb_clock/8)
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{
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SPI_InitStruct.BaudRatePres = SPI_BR_PRESCALER_8;
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}
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else if (max_hz >= spi_apb_clock/16)
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{
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SPI_InitStruct.BaudRatePres = SPI_BR_PRESCALER_16;
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}
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else if (max_hz >= spi_apb_clock/32)
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{
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SPI_InitStruct.BaudRatePres = SPI_BR_PRESCALER_32;
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}
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else if (max_hz >= spi_apb_clock/64)
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{
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SPI_InitStruct.BaudRatePres = SPI_BR_PRESCALER_64;
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}
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else if (max_hz >= spi_apb_clock/128)
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{
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SPI_InitStruct.BaudRatePres = SPI_BR_PRESCALER_128;
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}
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else
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{
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/* min prescaler 256 */
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SPI_InitStruct.BaudRatePres = SPI_BR_PRESCALER_256;
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}
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} /* baudrate */
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switch(configuration->mode & RT_SPI_MODE_3)
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{
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case RT_SPI_MODE_0:
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SPI_InitStruct.CLKPHA = SPI_CLKPHA_FIRST_EDGE;
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SPI_InitStruct.CLKPOL = SPI_CLKPOL_LOW;
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break;
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case RT_SPI_MODE_1:
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SPI_InitStruct.CLKPHA = SPI_CLKPHA_SECOND_EDGE;
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SPI_InitStruct.CLKPOL = SPI_CLKPOL_LOW;
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break;
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case RT_SPI_MODE_2:
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SPI_InitStruct.CLKPHA = SPI_CLKPHA_FIRST_EDGE;
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SPI_InitStruct.CLKPOL = SPI_CLKPOL_HIGH;
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break;
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case RT_SPI_MODE_3:
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SPI_InitStruct.CLKPHA = SPI_CLKPHA_SECOND_EDGE;
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SPI_InitStruct.CLKPOL = SPI_CLKPOL_HIGH;
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break;
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}
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/* MSB or LSB */
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if(configuration->mode & RT_SPI_MSB)
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{
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SPI_InitStruct.FirstBit = SPI_FB_MSB;
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}
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else
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{
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SPI_InitStruct.FirstBit = SPI_FB_LSB;
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}
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SPI_InitStruct.DataDirection = SPI_DIR_DOUBLELINE_FULLDUPLEX;
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SPI_InitStruct.SpiMode = SPI_MODE_MASTER;
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SPI_InitStruct.NSS = SPI_NSS_SOFT;
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/* init SPI */
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SPI_Init(spi_instance->config->spix, &SPI_InitStruct);
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/* Enable SPI_MASTER */
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SPI_Enable(spi_instance->config->spix, ENABLE);
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SPI_EnableCalculateCrc(spi_instance->config->spix, DISABLE);
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return RT_EOK;
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};
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static rt_uint32_t xfer(struct rt_spi_device* device, struct rt_spi_message* message)
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{
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struct rt_spi_bus * at32_spi_bus = (struct rt_spi_bus *)device->bus;
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struct n32_spi *spi_instance = (struct n32_spi *)at32_spi_bus->parent.user_data;
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struct rt_spi_configuration * config = &device->config;
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struct n32_spi_cs * at32_spi_cs = device->parent.user_data;
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RT_ASSERT(device != NULL);
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RT_ASSERT(message != NULL);
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/* take CS */
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if(message->cs_take)
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{
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GPIO_ResetBits(at32_spi_cs->GPIOx, at32_spi_cs->GPIO_Pin);
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DEBUG_PRINTF("spi take cs\n");
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}
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{
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if(config->data_width <= 8)
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{
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const rt_uint8_t * send_ptr = message->send_buf;
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rt_uint8_t * recv_ptr = message->recv_buf;
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rt_uint32_t size = message->length;
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DEBUG_PRINTF("spi poll transfer start: %d\n", size);
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while(size--)
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{
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rt_uint8_t data = 0xFF;
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if(send_ptr != RT_NULL)
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{
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data = *send_ptr++;
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}
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// Todo: replace register read/write by at32 lib
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//Wait until the transmit buffer is empty
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while(RESET == SPI_I2S_GetStatus(spi_instance->config->spix, SPI_I2S_TE_FLAG));
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// Send the byte
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SPI_I2S_TransmitData(spi_instance->config->spix, data);
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//Wait until a data is received
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while(RESET == SPI_I2S_GetStatus(spi_instance->config->spix, SPI_I2S_RNE_FLAG));
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// Get the received data
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data = SPI_I2S_ReceiveData(spi_instance->config->spix);
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if(recv_ptr != RT_NULL)
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{
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*recv_ptr++ = data;
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}
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}
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DEBUG_PRINTF("spi poll transfer finsh\n");
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}
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else if(config->data_width <= 16)
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{
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const rt_uint16_t * send_ptr = message->send_buf;
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rt_uint16_t * recv_ptr = message->recv_buf;
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rt_uint32_t size = message->length;
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while(size--)
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{
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rt_uint16_t data = 0xFF;
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if(send_ptr != RT_NULL)
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{
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data = *send_ptr++;
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}
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//Wait until the transmit buffer is empty
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while(RESET == SPI_I2S_GetStatus(spi_instance->config->spix, SPI_I2S_TE_FLAG));
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// Send the byte
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SPI_I2S_TransmitData(spi_instance->config->spix, data);
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//Wait until a data is received
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while(RESET == SPI_I2S_GetStatus(spi_instance->config->spix, SPI_I2S_RNE_FLAG));
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// Get the received data
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data = SPI_I2S_ReceiveData(spi_instance->config->spix);
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if(recv_ptr != RT_NULL)
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{
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*recv_ptr++ = data;
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}
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}
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}
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}
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/* release CS */
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if(message->cs_release)
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{
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GPIO_SetBits(at32_spi_cs->GPIOx, at32_spi_cs->GPIO_Pin);
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DEBUG_PRINTF("spi release cs\n");
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}
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return message->length;
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};
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static struct n32_spi_config configs[] = {
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#ifdef BSP_USING_SPI1
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{SPI1, "spi1"},
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#endif
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#ifdef BSP_USING_SPI2
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{SPI2, "spi2"},
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#endif
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#ifdef BSP_USING_SPI3
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{SPI3, "spi3"},
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#endif
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#ifdef BSP_USING_SPI4
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{SPI4, "spi4"},
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#endif
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};
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static struct n32_spi spis[sizeof(configs) / sizeof(configs[0])] = {0};
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/** \brief init and register at32 spi bus.
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*
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* \param SPI: at32 SPI, e.g: SPI1,SPI2,SPI3.
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* \param spi_bus_name: spi bus name, e.g: "spi1"
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* \return
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*
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*/
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int rt_hw_spi_init(void)
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{
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int i;
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rt_err_t result;
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rt_size_t obj_num = sizeof(spis) / sizeof(struct n32_spi);
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for (i = 0; i < obj_num; i++)
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{
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spis[i].config = &configs[i];
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spis[i].spi_bus.parent.user_data = (void *)&spis[i];
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result = rt_spi_bus_register(&(spis[i].spi_bus), spis[i].config->spi_name, &n32_spi_ops);
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}
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return result;
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}
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INIT_BOARD_EXPORT(rt_hw_spi_init);
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#endif
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