309 lines
7.6 KiB
C
309 lines
7.6 KiB
C
/*
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* Copyright (c) 2006-2019, 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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* 2020-06-27 AHTYDHD the first version
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*/
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#include "drv_spi.h"
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#include <stdint.h>
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#include <stdbool.h>
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#include "inc/hw_memmap.h"
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#include "driverlib/ssi.h"
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#include "driverlib/gpio.h"
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#include "driverlib/sysctl.h"
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#ifdef RT_USING_SPI
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#if defined(BSP_USING_SPI0) || defined(BSP_USING_SPI1) || defined(BSP_USING_SPI2) || defined(BSP_USING_SPI3)
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/* this driver can be disabled at menuconfig → RT-Thread Components → Device Drivers */
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#include "tm4c123_config.h"
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#include "spi_config.h"
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#include <string.h>
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//#define DRV_DEBUG
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#define LOG_TAG "drv.spi"
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#include <drv_log.h>
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enum
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{
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#ifdef BSP_USING_SPI0
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SPI0_INDEX,
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#endif
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#ifdef BSP_USING_SPI1
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SPI1_INDEX,
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#endif
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#ifdef BSP_USING_SPI2
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SPI2_INDEX,
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#endif
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#ifdef BSP_USING_SPI3
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SPI3_INDEX,
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#endif
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};
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static struct tm4c123_spi_config spi_config[] =
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{
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#ifdef BSP_USING_SPI0
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SPI0_BUS_CONFIG,
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#endif
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#ifdef BSP_USING_SPI1
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SPI1_BUS_CONFIG,
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#endif
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#ifdef BSP_USING_SPI2
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SPI2_BUS_CONFIG,
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#endif
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#ifdef BSP_USING_SPI3
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SPI3_BUS_CONFIG,
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#endif
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};
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static struct tm4c123_spi spi_bus_obj[sizeof(spi_config) / sizeof(spi_config[0])] = {0};
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static rt_err_t tm4c123_spi_configure(struct tm4c123_spi *spi_drv, struct rt_spi_configuration *cfg)
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{
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RT_ASSERT(spi_drv != RT_NULL);
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RT_ASSERT(cfg != RT_NULL);
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uint32_t ui32Protocol, ui32Mode;
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uint32_t ui32BitRate = (uint32_t)cfg->max_hz;
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uint32_t ui32DataWidth = (uint32_t)cfg->data_width;
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uint32_t pui32DataRx[1];
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rt_uint8_t ui8Protocol = 0;
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if (cfg->mode & RT_SPI_SLAVE)
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{
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ui32Mode = SSI_MODE_SLAVE;
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}
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else
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{
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ui32Mode = SSI_MODE_MASTER;
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}
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if (cfg->mode & RT_SPI_CPHA)
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{
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ui8Protocol += 1;
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}
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else
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{
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ui8Protocol += 0;
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}
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if (cfg->mode & RT_SPI_CPOL)
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{
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ui8Protocol += 2;
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}
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else
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{
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ui8Protocol += 0;
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}
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switch (ui8Protocol)
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{
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case 0:
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ui32Protocol = SSI_FRF_MOTO_MODE_0;
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break;
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case 1:
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ui32Protocol = SSI_FRF_MOTO_MODE_1;
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break;
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case 2:
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ui32Protocol = SSI_FRF_MOTO_MODE_2;
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break;
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case 3:
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ui32Protocol = SSI_FRF_MOTO_MODE_3;
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break;
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default:
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ui32Protocol = SSI_FRF_MOTO_MODE_0;
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break;
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}
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SSIConfigSetExpClk(spi_drv->config->base, SysCtlClockGet(), ui32Protocol,
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ui32Mode, ui32BitRate, ui32DataWidth);
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LOG_D("ssiclk freq: %d, SPI limiting freq: %d", SysCtlClockGet(), cfg->max_hz);
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SSIEnable(spi_drv->config->base);
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while (SSIDataGetNonBlocking(SSI0_BASE, &pui32DataRx[0]))
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{
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}
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LOG_D("%s init done", spi_drv->config->bus_name);
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return RT_EOK;
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}
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static rt_uint32_t spixfer(struct rt_spi_device *device, struct rt_spi_message *message)
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{
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rt_size_t message_length;
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rt_uint8_t *recv_buf;
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const rt_uint8_t *send_buf;
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uint32_t ReadData = 0;
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int i = 0;
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RT_ASSERT(device != RT_NULL);
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RT_ASSERT(device->bus != RT_NULL);
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RT_ASSERT(device->bus->parent.user_data != RT_NULL);
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RT_ASSERT(message != RT_NULL);
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struct tm4c123_spi *spi_drv = rt_container_of(device->bus, struct tm4c123_spi, spi_bus);
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struct tm4c123_hw_spi_cs *cs = device->parent.user_data;
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if (message->cs_take)
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{
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GPIOPinWrite(cs->portbase, cs->GPIO_Pin, 0);
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}
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LOG_D("%s transfer prepare and start", spi_drv->config->bus_name);
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LOG_D("%s sendbuf: %X, recvbuf: %X, length: %d",
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spi_drv->config->bus_name,
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(uint32_t)message->send_buf,
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(uint32_t)message->recv_buf, message->length);
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message_length = message->length;
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recv_buf = message->recv_buf;
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send_buf = message->send_buf;
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if (message->send_buf && message->recv_buf)
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{
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for (i = 0; i < message_length; i++)
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{
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SSIDataPut(spi_drv->config->base, (uint32_t)send_buf[i]);
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while (SSIBusy(spi_drv->config->base))
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{
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}
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SSIDataGet(spi_drv->config->base, &ReadData);
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recv_buf[i] = (unsigned char)ReadData;
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}
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}
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else if (message->send_buf)
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{
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for (i = 0; i < message_length; i++)
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{
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SSIDataPut(spi_drv->config->base, (uint32_t)send_buf[i]);
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while (SSIBusy(spi_drv->config->base))
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{
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}
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SSIDataGet(spi_drv->config->base, &ReadData);
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}
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}
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else
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{
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for (i = 0; i < message_length; i++)
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{
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SSIDataPut(spi_drv->config->base, (uint32_t)0xff);
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while (SSIBusy(spi_drv->config->base))
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{
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}
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SSIDataGet(spi_drv->config->base, &ReadData);
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recv_buf[i] = (unsigned char)ReadData;
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}
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}
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LOG_D("%s transfer done", spi_drv->config->bus_name);
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if (message->cs_release)
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{
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GPIOPinWrite(cs->portbase, cs->GPIO_Pin, cs->GPIO_Pin);
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}
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return message->length;
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}
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static rt_err_t spi_configure(struct rt_spi_device *device,
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struct rt_spi_configuration *configuration)
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{
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RT_ASSERT(device != RT_NULL);
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RT_ASSERT(configuration != RT_NULL);
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struct tm4c123_spi *spi_drv = rt_container_of(device->bus, struct tm4c123_spi, spi_bus);
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spi_drv->cfg = configuration;
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return tm4c123_spi_configure(spi_drv, configuration);
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}
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static const struct rt_spi_ops tm4c123_spi_ops =
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{
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.configure = spi_configure,
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.xfer = spixfer,
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};
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static int rt_hw_spi_bus_init(void)
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{
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rt_err_t result;
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for (int i = 0; i < sizeof(spi_config) / sizeof(spi_config[0]); i++)
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{
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spi_bus_obj[i].config = &spi_config[i];
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spi_bus_obj[i].spi_bus.parent.user_data = &spi_config[i];
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result = rt_spi_bus_register(&spi_bus_obj[i].spi_bus, spi_config[i].bus_name, &tm4c123_spi_ops);
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RT_ASSERT(result == RT_EOK);
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LOG_D("%s bus init done", spi_config[i].bus_name);
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}
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return result;
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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, uint32_t portindex, uint32_t cs_gpiobase, uint32_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 tm4c123_hw_spi_cs *cs_pin;
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/* initialize the cs pin && select the slave*/
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SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOA + portindex);
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GPIOPinTypeGPIOOutput(cs_gpiobase, cs_gpio_pin);
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GPIOPinWrite(cs_gpiobase, cs_gpio_pin, 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 tm4c123_hw_spi_cs *)rt_malloc(sizeof(struct tm4c123_hw_spi_cs));
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RT_ASSERT(cs_pin != RT_NULL);
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cs_pin->portbase = cs_gpiobase;
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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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LOG_E("%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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LOG_D("%s attach to %s done", device_name, bus_name);
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return result;
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}
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int rt_hw_spi_init(void)
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{
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spi_hw_config();
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return rt_hw_spi_bus_init();
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}
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INIT_BOARD_EXPORT(rt_hw_spi_init);
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#endif /* defined(BSP_USING_SPI0) || defined(BSP_USING_SPI1) || defined(BSP_USING_SPI2) || defined(BSP_USING_SPI3) */
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#endif /*RT_USING_SPI*/
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/************************** end of file ******************/ |