AT32F421专题---PA9 PA10的I2C1连接AT24C02失败及解决
【啰嗦2句】
一位网友向我请教PA9、PA10的I2C一直无法得到ACK信号，我很奇怪，I2C不是已经有大量案例了吗，怎么还会失败，要么他忘了加上拉电阻了，可是该网友已经有数年开发经验了，所以根本原因不在上拉电阻。
由于我上班忙，没时间帮他分析，就决定按官方开发板+官方eeprom示例，写个demo给他，结果捣鼓一晚上，发现----真的没反应。最后经过3个多小时的排查终于成功了，其中有多个细节需要注意。本文就开放这个案例给需要的人参考。
【需求】
网友需要用PA9、PA10的I2C1，连接他的外设，这里我们用AT24C02作为演示，谁让我手上AT24C02散件太多呢？而且也只有这个EEPROM最简单常见了。
【原理图】
【硬件连接】
开发板用的是官方的《AT_START_F421_V1.2》，必须吐槽官方的设计，开发板上连个I2C外设都没有，好歹搞个AT24C0x上去呀，几个钱都省，印证了雅特力的应用设计能力很一般，对产品应用场景缺少经验。所以只能自己飞一块AT24C02了。
【软件设计】
代码直接用官方BSP库里面的示例“eeprom”，路径为：
AT32F421_Firmware_Library_V2.1.2\project\at_start_f421\examples\i2c\eeprom
最后我会贴出改的源码，“伸手党”最喜欢了。
【常规软件修改过程】
这里我先说一下常规的操作，让读者也能复现失败的现象。
官方提供的eeprom案例，用的是PB10、PB11的I2C2，（但是官方这个readme.txt里面说是I2C1，加班忘了改的吧？），所以第一步就应该是把I2C2改为我们需要的PA9、PA10对应的I2C1，例如：
按理说这样改之后就能正常使用I2C1了，但是实际是不行的，I2C1没有任何反应。
【解决历程】
1. 有些同学可能会没注意421有很多的输入/输出复用器（IOMUX），查看《AT32F421技术手册_CH_V2.02.pdf》78页，6.2.9章节“IOMUX功能输入/输出”，看看是不是设置错了。由下图可知，一共有8个MUX，PA9和PA10必须配置为4号，那我的代码没错。
2. 继续认真查阅芯片数据手册《AT32F421数据手册_V2.01_CH.pdf》，PA9、PA10是这样描述的：
啊？？我竟然忘记PA9和PA10是复用了串口1（USART1）？原来，由于我的设计基本避开利用串口1，所以已经陌生。那问题一定是USART1被占用了！所以，先屏蔽掉所有跟串口1有关的代码（源码后面附上）：
"at32f421_board.c"的50行起到146行直接屏蔽，并且务必屏蔽“at32f421_board.h”的#include "stdio.h"。
奇迹并没有发生！失败了。
3. 再次检查AT24C02芯片焊接情况，上拉电阻接触良好，8根脚的电平正常。再次检查I2C其他参考示例的代码，从中寻找差异的地方，可惜，根本没有用到PA9、PA10这个I2C1，都是些PB6、PB7，还有I2C2的等等。
（大约2小时后......）
4. 不如去官网查查资料，我首先搜索了I2C1的资料，无果。忽然灵机一动，搜索PA9怎么样？
在技术文章没有搜到，倒是在FAQ里面找到一篇Questions：《带 AT_LINK_EZ 的开发板 USART1 (PA9 PA10)电平拉不低？》,啥玩意儿不知道，点开看看：
看到这个问答，我才恍然大悟，这个串口已经被AT-LINK占用鸟！！！再检查一下开发板，发现“罪魁祸首”了，发现了R9、R10两个0Ω短接：
好了，按官方说法是：
要解除此影响，方法如下：
1. 用户可将电阻 R9、R10 去掉；
2. 用户可使用除 AT-LINK-EZ 烧录口（CN6）外的其他 USB 口或电源接口为开发板供电。
对我来说，没有方法2，只有方法1，必须得铲掉它！铲掉铲掉，统统铲掉！
最后跑一遍程序，成功了！
终于如释重负，赶紧联系网友发资料发源码，甚至还问了对方“是否需要开发板”（真诚），那位网友还是很有礼貌地表达了谢意。
【总结】
1. I2C必须外部带上拉电阻，阻值4.7K为宜。
2. 记得修改所有的官方源码的I2C2为I2C1，并修改引脚的编号和MUX_4
3. 屏蔽stdio.h，以及所有USART1的代码
4. 开发板的R9、R10（背面）要么铲掉，要么额外给DC头供电，不用自带的AT-LINK-EZ。
【涉及修改的源码】
“main.c"
/**
**************************************************************************
* @file main.c
* @brief main program
**************************************************************************
这个例程用I2C1测试写入8字节内容，并且读出后对比是否一致。
每次开发板上的按键按下1次就执行一次上述动作
*/
#include "at32f421_board.h"
#include "at32f421_clock.h"
#include "i2c_application.h"
#include "eeprom.h"
#define BUF_SIZE 8
//示例写入的内容缓存
uint8_t write_buf[BUF_SIZE] = {0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08};
//示例读出的内容缓存
uint8_t read_buf[BUF_SIZE] = {0};
//这个函数用来比较写入EEPROM和读出是否一致
uint32_t buffer_compare(uint8_t* buffer1, uint8_t* buffer2, uint32_t len)
{
uint32_t i;
for(i = 0; i < len; i++)
{
if(buffer1[i] != buffer2[i])
{
return 1;
}
}
return 0;
}
/**
* @brief main function.
* @param none
* @retval none
*/
int main(void)
{
/* config nvic priority group */
nvic_priority_group_config(NVIC_PRIORITY_GROUP_4);
system_clock_config();
at32_board_init();
//注意：由于这里用的是PA9、PA10做I2C，跟USART1冲突了，所以USART1不能用，或者将USART1映射到别的脚
AT24CXX_Init(); //初始化AT24C02
while(1)
{
// 等待按键被按下，开发板上是PA0
while(at32_button_press() != USER_BUTTON)
{
}
//写入预设的值到地址0
AT24CXX_Write(0,write_buf,BUF_SIZE);
delay_ms(5);
//写完又读出到temp缓存，从地址0开始
AT24CXX_Read(0,read_buf,BUF_SIZE);//如果写入失败，这里读出的应该全00或全FF，
//对比一下效果
if((buffer_compare(write_buf, read_buf, BUF_SIZE) == 0))
{
at32_led_on(LED4);//开发板的绿灯闪
delay_ms(500);
at32_led_off(LED4);
}
else
{
at32_led_on(LED2);//开发的红灯闪
delay_ms(500);
at32_led_off(LED2);
}
}
}
/**
* @}
*/
/**
* @}
*/
"eeprom.h"----驱动AT24C02
#ifndef __EEPROM_H
#define __EEPROM_H
#include "stdint.h"
#define AT24C01 127
#define AT24C02 255 //定义芯片容量
#define AT24C04 511
#define AT24C08 1023
#define AT24C16 2047
#define AT24C32 4095
#define AT24C64 8191
#define AT24C128 16383
#define AT24C256 32767
#define EE_TYPE AT24C02 //更换芯片记得改这个型号
#define I2C_TIMEOUT 0xFFFFFFFF
#define I2Cx_SPEED 100000
#define I2Cx_ADDRESS 0xA0
#define I2Cx_PORT I2C1 //这些改I2C1相关
#define I2Cx_CLK CRM_I2C1_PERIPH_CLOCK
#define I2Cx_SCL_PIN GPIO_PINS_9
#define I2Cx_SCL_PIN_SOURCE GPIO_PINS_SOURCE9
#define I2Cx_SCL_PIN_MUX_NUM GPIO_MUX_4 //务必注意这里是4
#define I2Cx_SCL_GPIO_PORT GPIOA
#define I2Cx_SCL_GPIO_CLK CRM_GPIOA_PERIPH_CLOCK
#define I2Cx_SDA_PIN GPIO_PINS_10
#define I2Cx_SDA_PIN_SOURCE GPIO_PINS_SOURCE10
#define I2Cx_SDA_PIN_MUX_NUM GPIO_MUX_4
#define I2Cx_SDA_GPIO_PORT GPIOA
#define I2Cx_SDA_GPIO_CLK CRM_GPIOA_PERIPH_CLOCK
#define I2Cx_DMA_CLK CRM_DMA1_PERIPH_CLOCK
#define I2Cx_DMA_TX_CHANNEL DMA1_CHANNEL4
#define I2Cx_DMA_TX_IRQn DMA1_Channel5_4_IRQn
#define I2Cx_DMA_RX_CHANNEL DMA1_CHANNEL5
#define I2Cx_DMA_RX_IRQn DMA1_Channel5_4_IRQn
#define I2Cx_EVT_IRQn I2C1_EVT_IRQn
#define I2Cx_ERR_IRQn I2C1_ERR_IRQn
void AT24CXX_Init(void);
void AT24CXX_Write(uint16_t iAddress, uint8_t *buf, uint32_t length);
void AT24CXX_Read(uint16_t iAddress, uint8_t *buf, int32_t length);
#endif
"eeprom.c"----驱动AT24C02
#include "at32f421_board.h"
#include "at32f421_clock.h"
#include "i2c_application.h"
#include "eeprom.h"
//这个必须定义，大概是用于区分哪个I2C对象
i2c_handle_type hi2cx;
void error_handler(uint32_t error_code);
void i2c_lowlevel_init(i2c_handle_type* hi2c);
/**
* @brief error handler program
* @param i2c_status
* @retval none
*/
void error_handler(uint32_t error_code)
{
//while(1)
//{
//at32_led_toggle(LED2);
//delay_ms(500);
//}
}
/**
* @brief initializes peripherals used by the i2c.
* @param none
* @retval none
*/
void i2c_lowlevel_init(i2c_handle_type* hi2c)
{
gpio_init_type gpio_initstructure;
if(hi2c->i2cx == I2Cx_PORT)
{
/* i2c periph clock enable */
crm_periph_clock_enable(I2Cx_CLK, TRUE);
crm_periph_clock_enable(I2Cx_SCL_GPIO_CLK, TRUE);
crm_periph_clock_enable(I2Cx_SDA_GPIO_CLK, TRUE);
/* gpio configuration */
gpio_initstructure.gpio_out_type = GPIO_OUTPUT_OPEN_DRAIN;
gpio_initstructure.gpio_pull = GPIO_PULL_UP;
gpio_initstructure.gpio_mode = GPIO_MODE_MUX;
gpio_initstructure.gpio_drive_strength = GPIO_DRIVE_STRENGTH_MODERATE;
/* configure i2c pins: scl */
gpio_initstructure.gpio_pins = I2Cx_SCL_PIN;
gpio_init(I2Cx_SCL_GPIO_PORT, &gpio_initstructure);
gpio_pin_mux_config(I2Cx_SCL_GPIO_PORT, I2Cx_SCL_PIN_SOURCE, I2Cx_SCL_PIN_MUX_NUM);
gpio_pin_mux_config(GPIOA, GPIO_PINS_SOURCE9, GPIO_MUX_4);
/* configure i2c pins: sda */
gpio_initstructure.gpio_pins = I2Cx_SDA_PIN;
gpio_init(I2Cx_SDA_GPIO_PORT, &gpio_initstructure);
gpio_pin_mux_config(I2Cx_SDA_GPIO_PORT, I2Cx_SDA_PIN_SOURCE, I2Cx_SDA_PIN_MUX_NUM);
gpio_pin_mux_config(GPIOA, GPIO_PINS_SOURCE10, GPIO_MUX_4);
/* configure and enable i2c dma channel interrupt */
nvic_irq_enable(I2Cx_DMA_TX_IRQn, 0, 0);
nvic_irq_enable(I2Cx_DMA_RX_IRQn, 0, 0);
/* configure and enable i2c interrupt */
nvic_irq_enable(I2Cx_EVT_IRQn, 0, 0);
nvic_irq_enable(I2Cx_ERR_IRQn, 0, 0);
/* i2c dma tx and rx channels configuration */
/* enable the dma clock */
crm_periph_clock_enable(I2Cx_DMA_CLK, TRUE);
/* i2c dma channel configuration */
dma_reset(hi2c->dma_tx_channel);
dma_reset(hi2c->dma_rx_channel);
hi2c->dma_tx_channel = I2Cx_DMA_TX_CHANNEL;
hi2c->dma_rx_channel = I2Cx_DMA_RX_CHANNEL;
dma_default_para_init(&hi2c->dma_init_struct);
hi2c->dma_init_struct.peripheral_inc_enable = FALSE;
hi2c->dma_init_struct.memory_inc_enable = TRUE;
hi2c->dma_init_struct.peripheral_data_width = DMA_PERIPHERAL_DATA_WIDTH_BYTE;
hi2c->dma_init_struct.memory_data_width = DMA_MEMORY_DATA_WIDTH_BYTE;
hi2c->dma_init_struct.loop_mode_enable = FALSE;
hi2c->dma_init_struct.priority = DMA_PRIORITY_LOW;
hi2c->dma_init_struct.direction = DMA_DIR_MEMORY_TO_PERIPHERAL;
dma_init(hi2c->dma_tx_channel, &hi2c->dma_init_struct);
dma_init(hi2c->dma_rx_channel, &hi2c->dma_init_struct);
i2c_init(hi2c->i2cx, I2C_FSMODE_DUTY_2_1, I2Cx_SPEED);
i2c_own_address1_set(hi2c->i2cx, I2C_ADDRESS_MODE_7BIT, I2Cx_ADDRESS);
}
}
/****************************************************************
*函数：AT24CXX_Init
*功能：初始化EEPROM
*参数：无
*
****************************************************************/
void AT24CXX_Init(void)
{
hi2cx.i2cx = I2Cx_PORT;
i2c_config(&hi2cx);
}
/****************************************************************
*函数：AT24CXX_Write
*功能：写入EEPROM
*参数：buf--写入的内容，iAddress--地址，length--写入的内容长度
*
****************************************************************/
void AT24CXX_Write(uint16_t iAddress, uint8_t *buf, uint32_t length)
{
u8 i=0;
i2c_status_type i2c_status;
if(iAddress > EE_TYPE)
{
return;
}
if(iAddress + length >EE_TYPE)
{
length=EE_TYPE-iAddress;
}
for(i=0;i<length;i+=8)
{
if(length-i>8)
{
if((i2c_status = i2c_memory_write(&hi2cx, I2C_MEM_ADDR_WIDIH_8, I2Cx_ADDRESS, iAddress+i, &buf[i], 8, I2C_TIMEOUT)) != I2C_OK)
{
error_handler(i2c_status);
}
}
else
{
if((i2c_status = i2c_memory_write(&hi2cx, I2C_MEM_ADDR_WIDIH_8, I2Cx_ADDRESS, iAddress+i, &buf[i], length-i, I2C_TIMEOUT)) != I2C_OK)
{
error_handler(i2c_status);
}
}
delay_ms(5);
}
}
/****************************************************************
*函数：AT24CXX_Read
*功能：读出EEPROM
*参数：buf--读出的内容，iAddress--地址，length--读出的内容长度
*
****************************************************************/
void AT24CXX_Read(uint16_t iAddress, uint8_t *buf, int32_t length)
{
u8 i=0;
i2c_status_type i2c_status;
for(i=0;i<length;i+=8)
{
if(length-i>8)
{
if((i2c_status = i2c_memory_read(&hi2cx, I2C_MEM_ADDR_WIDIH_8, I2Cx_ADDRESS, iAddress+i, &buf[i], 8, I2C_TIMEOUT)) != I2C_OK)
{
error_handler(i2c_status);
}
}
else
{
if((i2c_status = i2c_memory_read(&hi2cx, I2C_MEM_ADDR_WIDIH_8, I2Cx_ADDRESS, iAddress+i, &buf[i], length-i, I2C_TIMEOUT)) != I2C_OK)
{
error_handler(i2c_status);
}
}
delay_ms(5);
}
}
”at32f421_board.h“
/**
**************************************************************************
* @file at32f421_board.h
* @brief header file for at-start board. set of firmware functions to
* manage leds and push-button. initialize delay function.
**************************************************************************
* Copyright notice & Disclaimer
*
* The software Board Support Package (BSP) that is made available to
* download from Artery official website is the copyrighted work of Artery.
* Artery authorizes customers to use, copy, and distribute the BSP
* software and its related documentation for the purpose of design and
* development in conjunction with Artery microcontrollers. Use of the
* software is governed by this copyright notice and the following disclaimer.
*
* THIS SOFTWARE IS PROVIDED ON "AS IS" BASIS WITHOUT WARRANTIES,
* GUARANTEES OR REPRESENTATIONS OF ANY KIND. ARTERY EXPRESSLY DISCLAIMS,
* TO THE FULLEST EXTENT PERMITTED BY LAW, ALL EXPRESS, IMPLIED OR
* STATUTORY OR OTHER WARRANTIES, GUARANTEES OR REPRESENTATIONS,
* INCLUDING BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
*
**************************************************************************
*/
#ifndef __AT32F421_BOARD_H
#define __AT32F421_BOARD_H
//#ifdef __cplusplus
//extern "C" {
//#endif
//#include "stdio.h"
#include "at32f421.h"
/** @addtogroup AT32F421_board
* @{
*/
/** @addtogroup BOARD
* @{
*/
/** @defgroup BOARD_pins_definition
* @{
*/
/**
* this header include define support list:
* 1. at-start-f421 v1.x boards
* if define AT_START_F421_V1, the header file support at-start-f421 v1.x board
*/
//#if !defined (AT_START_F421_V1)
#error "please select first the board at-start device used in your application (in at32f421_board.h file)"
//#endif
/******************** define led ********************/
typedef enum
{
LED2 = 0,
LED3 = 1,
LED4 = 2
} led_type;
#define LED_NUM 3
#if defined (AT_START_F421_V1)
#define LED2_PIN GPIO_PINS_6
#define LED2_GPIO GPIOF
#define LED2_GPIO_CRM_CLK CRM_GPIOF_PERIPH_CLOCK
#define LED3_PIN GPIO_PINS_7
#define LED3_GPIO GPIOF
#define LED3_GPIO_CRM_CLK CRM_GPIOF_PERIPH_CLOCK
#define LED4_PIN GPIO_PINS_11
#define LED4_GPIO GPIOB
#define LED4_GPIO_CRM_CLK CRM_GPIOB_PERIPH_CLOCK
#endif
/**************** define print uart ******************/
//取消所有跟USART有关的代码
//#define PRINT_UART USART2
//#define PRINT_UART_CRM_CLK CRM_USART2_PERIPH_CLOCK
//#define PRINT_UART_TX_PIN GPIO_PINS_14
//#define PRINT_UART_TX_GPIO GPIOA
//#define PRINT_UART_TX_GPIO_CRM_CLK CRM_GPIOA_PERIPH_CLOCK
//#define PRINT_UART_TX_PIN_SOURCE GPIO_PINS_SOURCE14
//#define PRINT_UART_TX_PIN_MUX_NUM GPIO_MUX_1
/******************* define button *******************/
typedef enum
{
USER_BUTTON = 0,
NO_BUTTON = 1
} button_type;
#define USER_BUTTON_PIN GPIO_PINS_0
#define USER_BUTTON_PORT GPIOA
#define USER_BUTTON_CRM_CLK CRM_GPIOA_PERIPH_CLOCK
/**
* @}
*/
/** @defgroup BOARD_exported_functions
* @{
*/
/******************** functions ********************/
void at32_board_init(void);
/* led operation function */
void at32_led_init(led_type led);
void at32_led_on(led_type led);
void at32_led_off(led_type led);
void at32_led_toggle(led_type led);
/* button operation function */
void at32_button_init(void);
button_type at32_button_press(void);
uint8_t at32_button_state(void);
/* delay function */
void delay_init(void);
void delay_us(uint32_t nus);
void delay_ms(uint16_t nms);
void delay_sec(uint16_t sec);
/* printf uart init function */
//void uart_print_init(uint32_t baudrate);
/**
* @}
*/
/**
* @}
*/
/**
* @}
*/
//#ifdef __cplusplus
//}
//#endif
#endif
"at32f421_board.c"
/**
**************************************************************************
* @file at32f421_board.c
* @brief set of firmware functions to manage leds and push-button.
* initialize delay function.
**************************************************************************
* Copyright notice & Disclaimer
*
* The software Board Support Package (BSP) that is made available to
* download from Artery official website is the copyrighted work of Artery.
* Artery authorizes customers to use, copy, and distribute the BSP
* software and its related documentation for the purpose of design and
* development in conjunction with Artery microcontrollers. Use of the
* software is governed by this copyright notice and the following disclaimer.
*
* THIS SOFTWARE IS PROVIDED ON "AS IS" BASIS WITHOUT WARRANTIES,
* GUARANTEES OR REPRESENTATIONS OF ANY KIND. ARTERY EXPRESSLY DISCLAIMS,
* TO THE FULLEST EXTENT PERMITTED BY LAW, ALL EXPRESS, IMPLIED OR
* STATUTORY OR OTHER WARRANTIES, GUARANTEES OR REPRESENTATIONS,
* INCLUDING BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
*
**************************************************************************
*/
#include "at32f421_board.h"
/** @addtogroup AT32F421_board
* @{
*/
/** @defgroup BOARD
* @brief onboard periph driver
* @{
*/
/* delay macros */
#define STEP_DELAY_MS 50
/* at-start led resouce array */
gpio_type *led_gpio_port[LED_NUM] = {LED2_GPIO, LED3_GPIO, LED4_GPIO};
uint16_t led_gpio_pin[LED_NUM] = {LED2_PIN, LED3_PIN, LED4_PIN};
crm_periph_clock_type led_gpio_crm_clk[LED_NUM] = {LED2_GPIO_CRM_CLK, LED3_GPIO_CRM_CLK, LED4_GPIO_CRM_CLK};
/* delay variable */
static __IO uint32_t fac_us;
static __IO uint32_t fac_ms;
//取消所有USART有关代码，否则冲突
///* support printf function, usemicrolib is unnecessary */
//#if (__ARMCC_VERSION > 6000000)
// __asm (".global __use_no_semihosting\n\t");
// void _sys_exit(int x)
// {
// x = x;
// }
// /* __use_no_semihosting was requested, but _ttywrch was */
// void _ttywrch(int ch)
// {
// ch = ch;
// }
// FILE __stdout;
//#else
// #ifdef __CC_ARM
// #pragma import(__use_no_semihosting)
// struct __FILE
// {
// int handle;
// };
// FILE __stdout;
// void _sys_exit(int x)
// {
// x = x;
// }
// /* __use_no_semihosting was requested, but _ttywrch was */
// void _ttywrch(int ch)
// {
// ch = ch;
// }
// #endif
//#endif
//#if defined (__GNUC__) && !defined (__clang__)
// //#define PUTCHAR_PROTOTYPE int __io_putchar(int ch)
//#else
// //#define PUTCHAR_PROTOTYPE int fputc(int ch, FILE *f)
//#endif
///**
// * @brief retargets the c library printf function to the usart.
// * @param none
// * @retval none
// */
//PUTCHAR_PROTOTYPE
//{
// while(usart_flag_get(PRINT_UART, USART_TDBE_FLAG) == RESET);
// usart_data_transmit(PRINT_UART, ch);
// return ch;
//}
//#if defined (__GNUC__) && !defined (__clang__)
//int _write(int fd, char *pbuffer, int size)
//{
// for(int i = 0; i < size; i ++)
// {
// __io_putchar(*pbuffer++);
// }
// return size;
//}
//#endif
///**
// * @brief initialize uart
// * @param baudrate: uart baudrate
// * @retval none
// */
//void uart_print_init(uint32_t baudrate)
//{
// gpio_init_type gpio_init_struct;
//#if defined (__GNUC__) && !defined (__clang__)
// setvbuf(stdout, NULL, _IONBF, 0);
//#endif
// /* enable the uart and gpio clock */
// crm_periph_clock_enable(PRINT_UART_CRM_CLK, TRUE);
// crm_periph_clock_enable(PRINT_UART_TX_GPIO_CRM_CLK, TRUE);
// gpio_default_para_init(&gpio_init_struct);
// /* configure the uart tx pin */
// gpio_init_struct.gpio_drive_strength = GPIO_DRIVE_STRENGTH_STRONGER;
// gpio_init_struct.gpio_out_type = GPIO_OUTPUT_PUSH_PULL;
// gpio_init_struct.gpio_mode = GPIO_MODE_MUX;
// gpio_init_struct.gpio_pins = PRINT_UART_TX_PIN;
// gpio_init_struct.gpio_pull = GPIO_PULL_NONE;
// gpio_init(PRINT_UART_TX_GPIO, &gpio_init_struct);
// gpio_pin_mux_config(PRINT_UART_TX_GPIO, PRINT_UART_TX_PIN_SOURCE, PRINT_UART_TX_PIN_MUX_NUM);
// /* configure uart param */
// usart_init(PRINT_UART, baudrate, USART_DATA_8BITS, USART_STOP_1_BIT);
// usart_transmitter_enable(PRINT_UART, TRUE);
// usart_enable(PRINT_UART, TRUE);
//}
/**
* @brief board initialize interface init led and button
* @param none
* @retval none
*/
void at32_board_init()
{
/* initialize delay function */
delay_init();
/* configure led in at_start_board */
at32_led_init(LED2);
at32_led_init(LED3);
at32_led_init(LED4);
at32_led_off(LED2);
at32_led_off(LED3);
at32_led_off(LED4);
/* configure button in at_start board */
at32_button_init();
}
/**
* @brief configure button gpio
* @param button: specifies the button to be configured.
* @retval none
*/
void at32_button_init(void)
{
gpio_init_type gpio_init_struct;
/* enable the button clock */
crm_periph_clock_enable(USER_BUTTON_CRM_CLK, TRUE);
/* set default parameter */
gpio_default_para_init(&gpio_init_struct);
/* configure button pin as input with pull-up/pull-down */
gpio_init_struct.gpio_drive_strength = GPIO_DRIVE_STRENGTH_STRONGER;
gpio_init_struct.gpio_out_type = GPIO_OUTPUT_PUSH_PULL;
gpio_init_struct.gpio_mode = GPIO_MODE_INPUT;
gpio_init_struct.gpio_pins = USER_BUTTON_PIN;
gpio_init_struct.gpio_pull = GPIO_PULL_DOWN;
gpio_init(USER_BUTTON_PORT, &gpio_init_struct);
}
/**
* @brief returns the selected button state
* @param none
* @retval the button gpio pin value
*/
uint8_t at32_button_state(void)
{
return gpio_input_data_bit_read(USER_BUTTON_PORT, USER_BUTTON_PIN);
}
/**
* @brief returns which button have press down
* @param none
* @retval the button have press down
*/
button_type at32_button_press()
{
static uint8_t pressed = 1;
/* get button state in at_start board */
if((pressed == 1) && (at32_button_state() != RESET))
{
/* debounce */
pressed = 0;
delay_ms(10);
if(at32_button_state() != RESET)
return USER_BUTTON;
}
else if(at32_button_state() == RESET)
{
pressed = 1;
}
return NO_BUTTON;
}
/**
* @brief configure led gpio
* @param led: specifies the led to be configured.
* @retval none
*/
void at32_led_init(led_type led)
{
gpio_init_type gpio_init_struct;
/* enable the led clock */
crm_periph_clock_enable(led_gpio_crm_clk[led], TRUE);
/* set default parameter */
gpio_default_para_init(&gpio_init_struct);
/* configure the led gpio */
gpio_init_struct.gpio_drive_strength = GPIO_DRIVE_STRENGTH_STRONGER;
gpio_init_struct.gpio_out_type = GPIO_OUTPUT_PUSH_PULL;
gpio_init_struct.gpio_mode = GPIO_MODE_OUTPUT;
gpio_init_struct.gpio_pins = led_gpio_pin[led];
gpio_init_struct.gpio_pull = GPIO_PULL_NONE;
gpio_init(led_gpio_port[led], &gpio_init_struct);
}
/**
* @brief turns selected led on.
* @param led: specifies the led to be set on.
* this parameter can be one of following parameters:
* @arg LED2
* @arg LED3
* @arg LED4
* @retval none
*/
void at32_led_on(led_type led)
{
if(led > (LED_NUM - 1))
return;
if(led_gpio_pin[led])
led_gpio_port[led]->clr = led_gpio_pin[led];
}
/**
* @brief turns selected led off.
* @param led: specifies the led to be set off.
* this parameter can be one of following parameters:
* @arg LED2
* @arg LED3
* @arg LED4
* @retval none
*/
void at32_led_off(led_type led)
{
if(led > (LED_NUM - 1))
return;
if(led_gpio_pin[led])
led_gpio_port[led]->scr = led_gpio_pin[led];
}
/**
* @brief turns selected led toggle.
* @param led: specifies the led to be set off.
* this parameter can be one of following parameters:
* @arg LED2
* @arg LED3
* @arg LED4
* @retval none
*/
void at32_led_toggle(led_type led)
{
if(led > (LED_NUM - 1))
return;
if(led_gpio_pin[led])
led_gpio_port[led]->odt ^= led_gpio_pin[led];
}
/**
* @brief initialize delay function
* @param none
* @retval none
*/
void delay_init()
{
/* configure systick */
systick_clock_source_config(SYSTICK_CLOCK_SOURCE_AHBCLK_NODIV);
fac_us = system_core_clock / (1000000U);
fac_ms = fac_us * (1000U);
}
/**
* @brief inserts a delay time.
* @param nus: specifies the delay time length, in microsecond.
* @retval none
*/
void delay_us(uint32_t nus)
{
uint32_t temp = 0;
SysTick->LOAD = (uint32_t)(nus * fac_us);
SysTick->VAL = 0x00;
SysTick->CTRL |= SysTick_CTRL_ENABLE_Msk ;
do
{
temp = SysTick->CTRL;
}while((temp & 0x01) && !(temp & (1 << 16)));
SysTick->CTRL &= ~SysTick_CTRL_ENABLE_Msk;
SysTick->VAL = 0x00;
}
/**
* @brief inserts a delay time.
* @param nms: specifies the delay time length, in milliseconds.
* @retval none
*/
void delay_ms(uint16_t nms)
{
uint32_t temp = 0;
while(nms)
{
if(nms > STEP_DELAY_MS)
{
SysTick->LOAD = (uint32_t)(STEP_DELAY_MS * fac_ms);
nms -= STEP_DELAY_MS;
}
else
{
SysTick->LOAD = (uint32_t)(nms * fac_ms);
nms = 0;
}
SysTick->VAL = 0x00;
SysTick->CTRL |= SysTick_CTRL_ENABLE_Msk;
do
{
temp = SysTick->CTRL;
}while((temp & 0x01) && !(temp & (1 << 16)));
SysTick->CTRL &= ~SysTick_CTRL_ENABLE_Msk;
SysTick->VAL = 0x00;
}
}
/**
* @brief inserts a delay time.
* @param sec: specifies the delay time, in seconds.
* @retval none
*/
void delay_sec(uint16_t sec)
{
uint16_t index;
for(index = 0; index < sec; index++)
{
delay_ms(500);
delay_ms(500);
}
}
/**
* @}
*/
/**
* @}
*/
希望雅特力能再进步些。