3d9d6198c8
How To Run:
see TencentOS-tiny\board\ALPHA_I.MX_emmc_256ddr\README.md
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288 lines
7.4 KiB
C
288 lines
7.4 KiB
C
/***************************************************************
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Copyright © zuozhongkai Co., Ltd. 1998-2019. All rights reserved.
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文件名 : bsp_led.c
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作者 : 左忠凯
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版本 : V1.0
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描述 : 串口驱动文件。
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其他 : 无
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论坛 : www.openedv.com
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日志 : 初版V1.0 2019/1/15 左忠凯创建
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***************************************************************/
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#include "bsp_uart.h"
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/*
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* @description : 初始化串口1,波特率为115200
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* @param : 无
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* @return : 无
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*/
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void uart_init(void)
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{
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/* 1、初始化串口IO */
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uart_io_init();
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/* 2、初始化UART1 */
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uart_disable(UART1); /* 先关闭UART1 */
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uart_softreset(UART1); /* 软件复位UART1 */
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UART1->
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UCR1 = 0; /* 先清除UCR1寄存器 */
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/*
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* 设置UART的UCR2寄存器，设置内容包括字长，停止位，校验模式，关闭RTS硬件流控
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* bit14: 1 忽略RTS引脚
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* bit8: 0 关闭奇偶校验
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* bit6: 0 1位停止位
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* bit5: 1 8位数据位
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* bit2: 1 打开发送
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* bit1: 1 打开接收
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*/
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UART1->UCR2 |= (1<<14) | (1<<5) | (1<<2) | (1<<1);
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/*
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* UART1的UCR3寄存器
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* bit2: 1 必须设置为1！参考IMX6ULL参考手册3642页
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*/
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UART1->UCR3 |= 1<<2;
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/*
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* 设置UART的UCR1寄存器，关闭自动波特率
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* bit14: 0 关闭自动波特率检测,我们自己设置波特率
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*/
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UART1->UCR1 &= ~(1<<14);
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/*
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* 设置波特率
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* 波特率计算公式:Baud Rate = Ref Freq / (16 * (UBMR + 1)/(UBIR+1))
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* 如果要设置波特率为115200，那么可以使用如下参数:
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* Ref Freq = 80M 也就是寄存器UFCR的bit9:7=101, 表示1分频
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* UBMR = 3124
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* UBIR = 71
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* 因此波特率= 80000000/(16 * (3124+1)/(71+1))=80000000/(16 * 3125/72) = (80000000*72) / (16*3125) = 115200
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*/
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UART1->UFCR = 5<<7; //ref freq等于ipg_clk/1=80Mhz
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UART1->UBIR = 71;
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UART1->UBMR = 3124;
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/* 使能串口 */
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uart_enable(UART1);
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}
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/*
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* @description : 初始化串口1所使用的IO引脚
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* @param : 无
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* @return : 无
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*/
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void uart_io_init(void)
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{
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/* 1、初始化IO复用
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* UART1_RXD -> UART1_TX_DATA
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* UART1_TXD -> UART1_RX_DATA
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*/
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IOMUXC_SetPinMux(IOMUXC_UART1_TX_DATA_UART1_TX,0); /* 复用为UART1_TX */
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IOMUXC_SetPinMux(IOMUXC_UART1_RX_DATA_UART1_RX,0); /* 复用为UART1_RX */
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/* 2、配置UART1_TX_DATA、UART1_RX_DATA的IO属性
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*bit 16:0 HYS关闭
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*bit [15:14]: 00 默认100K下拉
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*bit [13]: 0 keeper功能
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*bit [12]: 1 pull/keeper使能
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*bit [11]: 0 关闭开路输出
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*bit [7:6]: 10 速度100Mhz
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*bit [5:3]: 110 驱动能力R0/6
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*bit [0]: 0 低转换率
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*/
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IOMUXC_SetPinConfig(IOMUXC_UART1_TX_DATA_UART1_TX,0x10B0);
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IOMUXC_SetPinConfig(IOMUXC_UART1_RX_DATA_UART1_RX,0x10B0);
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}
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/*
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* @description : 波特率计算公式，
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* 可以用此函数计算出指定串口对应的UFCR，
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* UBIR和UBMR这三个寄存器的值
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* @param - base : 要计算的串口。
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* @param - baudrate : 要使用的波特率。
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* @param - srcclock_hz :串口时钟源频率，单位Hz
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* @return : 无
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*/
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void uart_setbaudrate(UART_Type *base, unsigned int baudrate, unsigned int srcclock_hz)
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{
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uint32_t numerator = 0u; //分子
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uint32_t denominator = 0U; //分母
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uint32_t divisor = 0U;
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uint32_t refFreqDiv = 0U;
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uint32_t divider = 1U;
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uint64_t baudDiff = 0U;
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uint64_t tempNumerator = 0U;
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uint32_t tempDenominator = 0u;
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/* get the approximately maximum divisor */
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numerator = srcclock_hz;
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denominator = baudrate << 4;
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divisor = 1;
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while (denominator != 0)
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{
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divisor = denominator;
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denominator = numerator % denominator;
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numerator = divisor;
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}
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numerator = srcclock_hz / divisor;
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denominator = (baudrate << 4) / divisor;
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/* numerator ranges from 1 ~ 7 * 64k */
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/* denominator ranges from 1 ~ 64k */
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if ((numerator > (UART_UBIR_INC_MASK * 7)) || (denominator > UART_UBIR_INC_MASK))
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{
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uint32_t m = (numerator - 1) / (UART_UBIR_INC_MASK * 7) + 1;
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uint32_t n = (denominator - 1) / UART_UBIR_INC_MASK + 1;
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uint32_t max = m > n ? m : n;
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numerator /= max;
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denominator /= max;
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if (0 == numerator)
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{
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numerator = 1;
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}
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if (0 == denominator)
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{
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denominator = 1;
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}
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}
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divider = (numerator - 1) / UART_UBIR_INC_MASK + 1;
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switch (divider)
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{
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case 1:
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refFreqDiv = 0x05;
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break;
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case 2:
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refFreqDiv = 0x04;
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break;
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case 3:
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refFreqDiv = 0x03;
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break;
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case 4:
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refFreqDiv = 0x02;
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break;
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case 5:
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refFreqDiv = 0x01;
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break;
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case 6:
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refFreqDiv = 0x00;
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break;
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case 7:
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refFreqDiv = 0x06;
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break;
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default:
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refFreqDiv = 0x05;
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break;
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}
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/* Compare the difference between baudRate_Bps and calculated baud rate.
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* Baud Rate = Ref Freq / (16 * (UBMR + 1)/(UBIR+1)).
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* baudDiff = (srcClock_Hz/divider)/( 16 * ((numerator / divider)/ denominator).
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*/
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tempNumerator = srcclock_hz;
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tempDenominator = (numerator << 4);
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divisor = 1;
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/* get the approximately maximum divisor */
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while (tempDenominator != 0)
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{
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divisor = tempDenominator;
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tempDenominator = tempNumerator % tempDenominator;
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tempNumerator = divisor;
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}
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tempNumerator = srcclock_hz / divisor;
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tempDenominator = (numerator << 4) / divisor;
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baudDiff = (tempNumerator * denominator) / tempDenominator;
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baudDiff = (baudDiff >= baudrate) ? (baudDiff - baudrate) : (baudrate - baudDiff);
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if (baudDiff < (baudrate / 100) * 3)
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{
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base->UFCR &= ~UART_UFCR_RFDIV_MASK;
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base->UFCR |= UART_UFCR_RFDIV(refFreqDiv);
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base->UBIR = UART_UBIR_INC(denominator - 1); //要先写UBIR寄存器，然后在写UBMR寄存器，3592页
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base->UBMR = UART_UBMR_MOD(numerator / divider - 1);
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//base->ONEMS = UART_ONEMS_ONEMS(srcclock_hz / (1000 * divider));
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}
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}
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/*
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* @description : 关闭指定的UART
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* @param - base: 要关闭的UART
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* @return : 无
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*/
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void uart_disable(UART_Type *base)
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{
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base->UCR1 &= ~(1<<0);
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}
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/*
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* @description : 打开指定的UART
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* @param - base: 要打开的UART
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* @return : 无
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*/
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void uart_enable(UART_Type *base)
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{
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base->UCR1 |= (1<<0);
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}
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/*
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* @description : 复位指定的UART
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* @param - base: 要复位的UART
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* @return : 无
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*/
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void uart_softreset(UART_Type *base)
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{
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base->UCR2 &= ~(1<<0); /* UCR2的bit0为0，复位UART */
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while((base->UCR2 & 0x1) == 0); /* 等待复位完成 */
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}
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/*
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* @description : 发送一个字符
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* @param - c : 要发送的字符
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* @return : 无
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*/
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void uart_putc(unsigned char c)
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{
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while(((UART1->USR2 >> 3) &0X01) == 0);/* 等待上一次发送完成 */
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UART1->UTXD = c & 0XFF; /* 发送数据 */
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}
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/*
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* @description : 发送一个字符串
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* @param - str : 要发送的字符串
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* @return : 无
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*/
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void uart_puts(char *str)
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{
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char *p = str;
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while(*p)
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uart_putc(*p++);
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}
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/*
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* @description : 接收一个字符
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* @param : 无
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* @return : 接收到的字符
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*/
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unsigned char uart_getc(void)
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{
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while((UART1->USR2 & 0x1) == 0);/* 等待接收完成 */
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return UART1->URXD; /* 返回接收到的数据 */
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}
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/*
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* @description : 防止编译器报错
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* @param : 无
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* @return : 无
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*/
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void raise(int sig_nr)
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{
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}
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