官方例程提供了一个基础的USB存储设备读写例程,接下来在这个例程的基础上实现一个简易的TXT阅读器,功能如下:
插入U盘后列出U盘中的TXT文件,点击按键选择文件,长按打开文件显示文件内容,
文件打开后,点击按键翻页,长按关闭文件返回文件列表
打开msc_only_fat32这个例程 ,添加之前的LCD驱动到例程中
YUYY_HS12864G18B_DEV_Type lcd_dev;
#define LCD_A0_PIN GPIO_PINS_4
#define LCD_A0_GPIO_PORT GPIOB
#define LCD_RST_PIN GPIO_PINS_6
#define LCD_RST_GPIO_PORT GPIOB
#define LCD_CS_PIN GPIO_PINS_7
#define LCD_CS_GPIO_PORT GPIOB
void wk_spi1_init(void)
{
/* add user code begin spi1_init 0 */
/* add user code end spi1_init 0 */
gpio_init_type gpio_init_struct;
spi_init_type spi_init_struct;
crm_periph_clock_enable(CRM_SPI1_PERIPH_CLOCK, TRUE);
gpio_default_para_init(&gpio_init_struct);
spi_default_para_init(&spi_init_struct);
/* add user code begin spi1_init 1 */
/* add user code end spi1_init 1 */
/* configure the SCK pin */
gpio_init_struct.gpio_drive_strength = GPIO_DRIVE_STRENGTH_MODERATE;
gpio_init_struct.gpio_out_type = GPIO_OUTPUT_PUSH_PULL;
gpio_init_struct.gpio_mode = GPIO_MODE_MUX;
gpio_init_struct.gpio_pins = GPIO_PINS_3;
gpio_init_struct.gpio_pull = GPIO_PULL_NONE;
gpio_init(GPIOB, &gpio_init_struct);
gpio_pin_mux_config(GPIOB, GPIO_PINS_SOURCE3, GPIO_MUX_5);
/* configure the MOSI pin */
gpio_init_struct.gpio_drive_strength = GPIO_DRIVE_STRENGTH_MODERATE;
gpio_init_struct.gpio_out_type = GPIO_OUTPUT_PUSH_PULL;
gpio_init_struct.gpio_mode = GPIO_MODE_MUX;
gpio_init_struct.gpio_pins = GPIO_PINS_5;
gpio_init_struct.gpio_pull = GPIO_PULL_NONE;
gpio_init(GPIOB, &gpio_init_struct);
gpio_pin_mux_config(GPIOB, GPIO_PINS_SOURCE5, GPIO_MUX_5);
/* configure param */
spi_init_struct.transmission_mode = SPI_TRANSMIT_HALF_DUPLEX_TX;
spi_init_struct.master_slave_mode = SPI_MODE_MASTER;
spi_init_struct.frame_bit_num = SPI_FRAME_8BIT;
spi_init_struct.first_bit_transmission = SPI_FIRST_BIT_MSB;
spi_init_struct.mclk_freq_division = SPI_MCLK_DIV_8;
spi_init_struct.clock_polarity = SPI_CLOCK_POLARITY_HIGH;
spi_init_struct.clock_phase = SPI_CLOCK_PHASE_2EDGE;
spi_init_struct.cs_mode_selection = SPI_CS_SOFTWARE_MODE;
spi_init(SPI1, &spi_init_struct);
spi_enable(SPI1, TRUE);
/* add user code begin spi1_init 2 */
/* add user code end spi1_init 2 */
}
void lcd_spiwritebyte(spi_type *spix,uint8_t byte)
{
while(spi_i2s_flag_get(spix, SPI_I2S_TDBE_FLAG) == RESET);
spi_i2s_data_transmit(spix,byte);
}
void lcd_show_welcom()
{
YUYY_HS12864G18B_ClearScreen(&lcd_dev);
YUYY_HS12864G18B_DisplayString8x16(&lcd_dev,0,0,0," AT32F405 TEST");
YUYY_HS12864G18B_DisplayString8x16(&lcd_dev,0,2,0,"TXT FILE READER");
YUYY_HS12864G18B_DisplayString8x16(&lcd_dev,0,4,0," Wait USB Dev");
YUYY_HS12864G18B_DisplayString8x16(&lcd_dev,0,6,0,"Code by yuyy1989");
}
void lcd_init()
{
gpio_init_type gpio_init_struct;
gpio_default_para_init(&gpio_init_struct);
crm_periph_clock_enable(CRM_GPIOB_PERIPH_CLOCK, TRUE);
/* add user code begin gpio_config 1 */
/* add user code end gpio_config 1 */
/* gpio output config */
gpio_bits_set(GPIOB, LCD_A0_PIN | LCD_RST_PIN | LCD_CS_PIN);
gpio_init_struct.gpio_drive_strength = GPIO_DRIVE_STRENGTH_MODERATE;
gpio_init_struct.gpio_out_type = GPIO_OUTPUT_PUSH_PULL;
gpio_init_struct.gpio_mode = GPIO_MODE_OUTPUT;
gpio_init_struct.gpio_pins = LCD_A0_PIN | LCD_RST_PIN | LCD_CS_PIN;
gpio_init_struct.gpio_pull = GPIO_PULL_NONE;
gpio_init(GPIOB, &gpio_init_struct);
wk_spi1_init();
lcd_dev.cs.gpio = LCD_CS_GPIO_PORT;
lcd_dev.cs.pin = LCD_CS_PIN;
lcd_dev.a0.gpio = LCD_A0_GPIO_PORT;
lcd_dev.a0.pin = LCD_A0_PIN;
lcd_dev.rst.gpio = LCD_RST_GPIO_PORT;
lcd_dev.rst.pin = LCD_RST_PIN;
lcd_dev.spix = SPI1;
lcd_dev.spi_sendbyte_func = (YUYY_HS12864G18B_SpiWriteByteFunc_Type)lcd_spiwritebyte;
YUYY_HS12864G18B_Init(&lcd_dev);
lcd_show_welcom();
}
实现按键点击和长按的识别,这里使用1ms的定时器对按键按下状态计数实现去抖和单击长按的识别,在主循环中ms_ticked == 1时调用AppButtonLoop()并重新将ms_ticked 置0
void wk_tmr6_init(void)
{
crm_periph_clock_enable(CRM_TMR6_PERIPH_CLOCK, TRUE);
tmr_base_init(TMR6, 999, 215);
tmr_cnt_dir_set(TMR6, TMR_COUNT_UP);
tmr_period_buffer_enable(TMR6, FALSE);
/* configure primary mode settings */
tmr_primary_mode_select(TMR6, TMR_PRIMARY_SEL_RESET);
/* configure overflow event */
tmr_overflow_request_source_set(TMR6, TRUE);
tmr_counter_enable(TMR6, TRUE);
/* add user code begin tmr6_init 2 */
tmr_interrupt_enable(TMR6,TMR_OVF_INT,TRUE);
/* add user code end tmr6_init 2 */
nvic_irq_enable(TMR6_GLOBAL_IRQn, 0, 0);
}
uint8_t ms_ticked = 0;
uint16_t led_conut = 0;
void AppLepLoop()
{
if(led_conut > 0)
led_conut -= 1;
if(led_conut == 0)
{
led_conut = 1000;
at32_led_toggle(LED2);
at32_led_toggle(LED3);
at32_led_toggle(LED4);
}
}
uint16_t button_down_count = 0;
void AppButtonLoop()
{
if(at32_button_state() != RESET)
{
button_down_count += 1;
}
else
{
if(button_down_count > 20 && button_down_count < 500)
{
USBH_DEBUG("button clicked");
yuyy_button_clicked();
}
button_down_count = 0;
}
if(button_down_count == 1000)
{
USBH_DEBUG("button long press");
yuyy_button_longpressed();
}
}
void AppMsTick(void)
{
ms_ticked = 1;
}
实现U盘中TXT文件的扫描
#define MAX_TXT_NUM 10
char filenames[MAX_TXT_NUM][14];
uint8_t txt_num = 0;
void yuyy_scantxt()
{
uint8_t len,i;
FRESULT res;
FILINFO fileinfo;
DIR dir;
res=f_opendir(&dir,"/");
if(res != FR_OK)
return;
memset(filenames,0,MAX_TXT_NUM*14);
txt_num = 0;
while(1)
{
char* pstr;
res = f_readdir(&dir, &fileinfo);
if (res != FR_OK || fileinfo.fname[0] == 0 || txt_num == MAX_TXT_NUM)
break;
if(fileinfo.fattrib&AM_DIR)
continue;
len = strlen(fileinfo.fname);
if(len > 4 && memcmp(&fileinfo.fname[len-4],".TXT",4) == 0)
memcpy(filenames[txt_num++],fileinfo.fname,13);
}
i = 0;
while(i < txt_num)
{
USBH_DEBUG("%d: %s",i,filenames[i]);
i++;
}
}
显示文件列表和文件内容
uint8_t select_index = 0;
uint8_t filed_opened = 0;
uint8_t file_read_end = 0;
uint8_t file_buffer[80];
uint8_t file_buffer_len = 0;
char lcd_buffer[4][17];
void yuyy_show_txt()
{
uint8_t start_index = 0;
uint8_t i = 0;
YUYY_HS12864G18B_ClearScreen(&lcd_dev);
if(txt_num == 0)
{
YUYY_HS12864G18B_DisplayString8x16(&lcd_dev,0,0,0,"NO TXT FILES");
return;
}
if(!filed_opened)
{
if(txt_num > 4)
{
if(select_index == txt_num - 1 )
start_index = select_index - 3;
else if(select_index > 2 )
start_index = select_index - 2;
}
while(start_index < txt_num)
{
YUYY_HS12864G18B_DisplayString8x16(&lcd_dev,select_index == start_index?YUYY_FONT_DATAS_REVERSE:0,i*2,0,filenames[start_index]);
i += 1;
start_index += 1;
}
}
else
{
YUYY_HS12864G18B_DisplayString8x16(&lcd_dev,0,0,0,lcd_buffer[0]);
YUYY_HS12864G18B_DisplayString8x16(&lcd_dev,0,2,0,lcd_buffer[1]);
YUYY_HS12864G18B_DisplayString8x16(&lcd_dev,0,4,0,lcd_buffer[2]);
YUYY_HS12864G18B_DisplayString8x16(&lcd_dev,0,6,0,lcd_buffer[3]);
}
}
void yuyy_readbuffer_to_lcd()
{
uint8_t i = 0,j = 0,k = 0;
uint32_t len = 0;
memset(lcd_buffer,0,68);
if(file_buffer_len == 0)
{
f_lseek(&file,0);
file_read_end = 0;
file_buffer_len = 0;
}
if(!file_read_end && file_buffer_len < 80)
{
if(f_read(&file, &file_buffer[file_buffer_len], 80-file_buffer_len, &len) == FR_OK)
{
if(len == 0 || len < 80-file_buffer_len)
{
file_read_end = 1;
}
file_buffer_len += len;
}
}
while(j < 4)
{
i = 0;
while(i < 16 && k < file_buffer_len)
{
if(file_buffer[k]>0x19 && file_buffer[k] < 0x7F)
{
lcd_buffer[j][i] = file_buffer[k];
i += 1;
}
else if(file_buffer[k] == '\n' && i > 0)
{
i = 16;
}
k += 1;
}
j += 1;
}
i = 0;
j = k;
while(i < k && j < 80)
{
file_buffer[i] = file_buffer[j];
i += 1;
j += 1;
}
file_buffer_len -= k;
}
void yuyy_button_clicked()
{
if(!filed_opened)
{
select_index += 1;
if(txt_num > 0 && select_index > txt_num - 1)
select_index = 0;
yuyy_show_txt();
}
else
{
yuyy_readbuffer_to_lcd();
yuyy_show_txt();
}
}
void yuyy_button_longpressed()
{
if(txt_num == 0)
return;
if(!filed_opened)
{
if(f_open(&file, filenames[select_index], FA_READ) == FR_OK)
{
filed_opened = 1;
memset(file_buffer,0,80);
yuyy_readbuffer_to_lcd();
yuyy_show_txt();
}
}
else
{
if(f_close(&file) == FR_OK)
{
filed_opened = 0;
file_read_end = 0;
file_buffer_len = 0;
yuyy_show_txt();
}
}
}
在usbh_user_application()中case USR_APP分支中注释掉原来的读写文件方法,加入yuyy_scantxt();和 yuyy_show_txt();
运行效果
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