You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
281 lines
6.8 KiB
281 lines
6.8 KiB
/*
|
|
* Copyright (c) 2006-2018, RT-Thread Development Team
|
|
*
|
|
* SPDX-License-Identifier: Apache-2.0
|
|
*
|
|
* Change Logs:
|
|
* Date Author Notes
|
|
* 2017-10-23 勤为本 first version
|
|
*/
|
|
|
|
// 硬件spi接口源文件
|
|
|
|
#include <string.h>
|
|
#include "ls1c_public.h"
|
|
#include "ls1c_regs.h"
|
|
#include "ls1c_clock.h"
|
|
#include "ls1c_spi.h"
|
|
|
|
|
|
|
|
|
|
/*
|
|
* 获取指定SPI模块的基地址
|
|
* @SPIx SPI模块的编号
|
|
*/
|
|
void *ls1c_spi_get_base(unsigned char SPIx)
|
|
{
|
|
void *base = NULL;
|
|
|
|
switch (SPIx)
|
|
{
|
|
case LS1C_SPI_0:
|
|
base = (void *)LS1C_SPI0_BASE;
|
|
break;
|
|
|
|
case LS1C_SPI_1:
|
|
base = (void *)LS1C_SPI1_BASE;
|
|
break;
|
|
|
|
default:
|
|
base = NULL;
|
|
break;
|
|
}
|
|
|
|
return base;
|
|
}
|
|
|
|
|
|
/*
|
|
* 打印指定SPI模块的所有寄存器的值
|
|
* @spi_base 基地址
|
|
*/
|
|
void ls1c_spi_print_all_regs_info(void *spi_base)
|
|
{
|
|
printf("[%s] SPCR=0x%x, SPSR=0x%x, SPER=0x%x, SFC_PARAM=0x%x, SFC_SOFTCS=0x%x, SFC_TIMING=0x%x\r\n",
|
|
__FUNCTION__,
|
|
reg_read_8(spi_base + LS1C_SPI_SPCR_OFFSET),
|
|
reg_read_8(spi_base + LS1C_SPI_SPSR_OFFSET),
|
|
reg_read_8(spi_base + LS1C_SPI_SPER_OFFSET),
|
|
reg_read_8(spi_base + LS1C_SPI_SFC_PARAM_OFFSET),
|
|
reg_read_8(spi_base + LS1C_SPI_SFC_SOFTCS_OFFSET),
|
|
reg_read_8(spi_base + LS1C_SPI_SFC_TIMING_OFFSET));
|
|
|
|
return ;
|
|
}
|
|
|
|
|
|
/*
|
|
* 根据SPI时钟频率计算分频系数
|
|
* @max_speed_hz SPI最大通信速度
|
|
* @ret 分频系数
|
|
*/
|
|
unsigned int ls1c_spi_get_div(unsigned int max_speed_hz)
|
|
{
|
|
unsigned long clk = 0;
|
|
unsigned int div = 0;
|
|
unsigned int div_tmp = 0;
|
|
unsigned int bit = 0;
|
|
|
|
clk = clk_get_apb_rate();
|
|
div = DIV_ROUND_UP(clk, max_speed_hz);
|
|
|
|
if (div < 2)
|
|
div = 2;
|
|
|
|
if (div > 4096)
|
|
div = 4096;
|
|
|
|
bit = ls1c_fls(div) - 1;
|
|
switch (1 << bit)
|
|
{
|
|
case 16:
|
|
div_tmp = 2;
|
|
if (div > (1 << bit))
|
|
{
|
|
div_tmp++;
|
|
}
|
|
break;
|
|
|
|
case 32:
|
|
div_tmp = 3;
|
|
if (div > (1 << bit))
|
|
{
|
|
div_tmp += 2;
|
|
}
|
|
break;
|
|
|
|
case 8:
|
|
div_tmp = 4;
|
|
if (div > (1 << bit))
|
|
{
|
|
div_tmp -= 2;
|
|
}
|
|
break;
|
|
|
|
default:
|
|
div_tmp = bit - 1;
|
|
if (div > (1 << bit))
|
|
{
|
|
div_tmp++;
|
|
}
|
|
break;
|
|
}
|
|
/*
|
|
printf("[%s] clk=%ld, max_speed_hz=%d, div_tmp=%d, bit=%d\r\n",
|
|
__FUNCTION__, clk, max_speed_hz, div_tmp, bit);
|
|
*/
|
|
return div_tmp;
|
|
}
|
|
|
|
|
|
/*
|
|
* 设置时钟
|
|
* @spi_base 基地址
|
|
* @max_hz 最大频率，单位hz
|
|
*/
|
|
void ls1c_spi_set_clock(void *spi_base, unsigned long max_hz)
|
|
{
|
|
unsigned int div = 0;
|
|
unsigned char val = 0;
|
|
|
|
// 获取分频系数
|
|
div = ls1c_spi_get_div(max_hz);
|
|
|
|
// 设置spr
|
|
val = reg_read_8(spi_base + LS1C_SPI_SPCR_OFFSET);
|
|
val &= (~LS1C_SPI_SPCR_SPR_MASK); // spr清零
|
|
val |= (div & LS1C_SPI_SPCR_SPR_MASK); // 设置新的spr
|
|
reg_write_8(val, spi_base + LS1C_SPI_SPCR_OFFSET);
|
|
|
|
// 设置spre
|
|
val = reg_read_8(spi_base + LS1C_SPI_SPER_OFFSET);
|
|
val &= (~LS1C_SPI_SPER_SPRE_MASK); // spre清零
|
|
val |= ((div >> 2) & LS1C_SPI_SPER_SPRE_MASK); // 设置新的spre
|
|
reg_write_8(val, spi_base + LS1C_SPI_SPER_OFFSET);
|
|
|
|
return ;
|
|
}
|
|
|
|
|
|
/*
|
|
* 设置通信模式(时钟极性和相位)
|
|
* @spi_base 基地址
|
|
* @cpol 时钟极性
|
|
* @cpha 时钟相位
|
|
*/
|
|
void ls1c_spi_set_mode(void *spi_base, unsigned char cpol, unsigned char cpha)
|
|
{
|
|
unsigned char val = 0;
|
|
|
|
val = reg_read_8(spi_base + LS1C_SPI_SPCR_OFFSET);
|
|
|
|
// 设置时钟极性--cpol
|
|
val &= (~LS1C_SPI_SPCR_CPOL_MASK); // cpol清0
|
|
val |= (cpol << LS1C_SPI_SPCR_CPOL_BIT); // 写入新的cpol
|
|
|
|
// 设置时钟相位--cpha
|
|
val &= (~LS1C_SPI_SPCR_CPHA_MASK); // cpha清0
|
|
val |= (cpha << LS1C_SPI_SPCR_CPHA_BIT); // 写入新的cpha
|
|
|
|
reg_write_8(val, spi_base + LS1C_SPI_SPCR_OFFSET);
|
|
|
|
return ;
|
|
}
|
|
|
|
|
|
/*
|
|
* 设置指定片选为指定状态
|
|
* @spi_base 基地址
|
|
* @cs 片选
|
|
* @new_status 片选引脚的新状态，取值为0或1，即高电平或低电平
|
|
*/
|
|
void ls1c_spi_set_cs(void *spi_base, unsigned char cs, int new_status)
|
|
{
|
|
unsigned char val = 0;
|
|
|
|
val = reg_read_8(spi_base + LS1C_SPI_SFC_SOFTCS_OFFSET);
|
|
val |= 0x01 << cs ; //对应的csen=1
|
|
if (new_status) // cs = 1
|
|
{
|
|
val |= (0x10 << cs); // 指定csn=1
|
|
}
|
|
else // cs = 0
|
|
{
|
|
val &= ~(0x10 << cs); // 指定csn=0
|
|
}
|
|
reg_write_8(val, spi_base + LS1C_SPI_SFC_SOFTCS_OFFSET);
|
|
|
|
return ;
|
|
}
|
|
|
|
|
|
/*
|
|
* 等待收发完成
|
|
* @spi_base 基地址
|
|
*/
|
|
void ls1c_spi_wait_txrx_done(void *spi_base)
|
|
{
|
|
int timeout = LS1C_SPI_TX_TIMEOUT;
|
|
|
|
while (timeout--)
|
|
{
|
|
if (LS1C_SPI_SPSR_SPIF_MASK & reg_read_8(spi_base + LS1C_SPI_SPSR_OFFSET))
|
|
break;
|
|
}
|
|
|
|
return ;
|
|
}
|
|
|
|
|
|
/*
|
|
* 清中断和标志位
|
|
* @spi_base 基地址
|
|
*/
|
|
void ls1c_spi_clear(void *spi_base)
|
|
{
|
|
unsigned char val = 0;
|
|
|
|
// 清中断
|
|
val = reg_read_8(spi_base + LS1C_SPI_SPSR_OFFSET);
|
|
val |= LS1C_SPI_SPSR_SPIF_MASK;
|
|
reg_write_8(val, spi_base + LS1C_SPI_SPSR_OFFSET);
|
|
|
|
// 清溢出标志位(Write-Collision Clear)
|
|
val = reg_read_8(spi_base + LS1C_SPI_SPSR_OFFSET);
|
|
if (LS1C_SPI_SPSR_WCOL_MASK & val)
|
|
{
|
|
printf("[%s] clear register SPSR's wcol!\r\n", __FUNCTION__); // 手册和linux源码中不一样，加个打印看看
|
|
reg_write_8(val & ~LS1C_SPI_SPSR_WCOL_MASK, spi_base + LS1C_SPI_SPSR_OFFSET); // 写0，linux源码中是写0
|
|
// reg_write_8(val | LS1C_SPI_SPSR_WCOL_MASK, spi_base + LS1C_SPI_SPSR_OFFSET); // 写1，按照1c手册，应该写1
|
|
}
|
|
|
|
return ;
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* 通过指定SPI发送接收一个字节
|
|
* 注意，在多任务的系统中，此函数需要互斥。
|
|
* 即保证在和某个从设备收发某个字节的过程中，不能被切换到其它任务同时与另外的在同一个SPI总线上的从设备通信
|
|
* 因为龙芯1c的每路SPI上可能接有不同的从设备，通信频率、模式等可能不同
|
|
* @spi_base 基地址
|
|
* @tx_ch 待发送的数据
|
|
* @ret 收到的数据
|
|
*/
|
|
unsigned char ls1c_spi_txrx_byte(void *spi_base, unsigned char tx_ch)
|
|
{
|
|
unsigned char rx_ch = 0;
|
|
|
|
// 收发数据
|
|
reg_write_8(tx_ch, spi_base + LS1C_SPI_TxFIFO_OFFSET); // 开始发送
|
|
ls1c_spi_wait_txrx_done(spi_base); // 等待收发完成
|
|
rx_ch = reg_read_8(spi_base + LS1C_SPI_RxFIFO_OFFSET); // 读取收到的数据
|
|
ls1c_spi_clear(spi_base); // 清中断和标志位
|
|
|
|
return rx_ch;
|
|
}
|
|
|
|
|
|
|
|
|