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#include "at32f403a_407_board.h"
#include "at32f403a_407_clock.h"
#include "usbd_core.h"
#include "cdc_class.h"
#include "cdc_desc.h"
#include "usbd_int.h"
void usb_usart_config(linecoding_type linecoding);
void usart_gpio_config(void);
#define usart_buffer_size 2048
uint8_t usart_rx_buffer[usart_buffer_size];
uint16_t hw_usart_rx_index = 0;
uint16_t hw_usart_read_index = 0;
uint16_t usart_rx_data_len = 0;
uint16_t ov_cnt = 0;
void usart_send_data(uint8_t *send_data, uint16_t len);
uint16_t usart_receive_data(void);
/**
* @brief usb 48M clock select
* @param clk_s:USB_CLK_HICK, USB_CLK_HEXT
* @retval none
*/
void usb_clock48m_select(usb_clk48_s clk_s)
{
crm_clocks_freq_type clocks_struct;
if(clk_s == USB_CLK_HICK)
{
crm_usb_clock_source_select(CRM_USB_CLOCK_SOURCE_HICK);
/* enable the acc calibration ready interrupt */
crm_periph_clock_enable(CRM_ACC_PERIPH_CLOCK, TRUE);
/* update the c1\c2\c3 value */
acc_write_c1(7980);
acc_write_c2(8000);
acc_write_c3(8020);
/* open acc calibration */
acc_calibration_mode_enable(ACC_CAL_HICKTRIM, TRUE);
}
else
{
crm_clocks_freq_get(&clocks_struct);
switch(clocks_struct.sclk_freq)
{
/* 48MHz */
case 48000000:
crm_usb_clock_div_set(CRM_USB_DIV_1);
break;
/* 72MHz */
case 72000000:
crm_usb_clock_div_set(CRM_USB_DIV_1_5);
break;
/* 96MHz */
case 96000000:
crm_usb_clock_div_set(CRM_USB_DIV_2);
break;
/* 120MHz */
case 120000000:
crm_usb_clock_div_set(CRM_USB_DIV_2_5);
break;
/* 144MHz */
case 144000000:
crm_usb_clock_div_set(CRM_USB_DIV_3);
break;
/* 168MHz */
case 168000000:
crm_usb_clock_div_set(CRM_USB_DIV_3_5);
break;
/* 192MHz */
case 192000000:
crm_usb_clock_div_set(CRM_USB_DIV_4);
break;
default:
break;
}
}
}
int main(void)
{
uint16_t data_len;
uint32_t timeout;
uint8_t send_zero_packet = 0;
/* config nvic priority group */
nvic_priority_group_config(NVIC_PRIORITY_GROUP_4);
system_clock_config();
at32_board_init();
/* usart gpio config */
usart_gpio_config();
/* hardware usart config: usart2 */
usb_usart_config(linecoding);
/* select usb 48m clcok source */
usb_clock48m_select(USB_CLK_HEXT);
/* enable usb clock */
crm_periph_clock_enable(CRM_USB_PERIPH_CLOCK, TRUE);
/* enable usb interrupt */
nvic_irq_enable(USBFS_L_CAN1_RX0_IRQn, 0, 0);
/* usb core init */
usbd_core_init(&usb_core_dev, USB, &cdc_class_handler, &cdc_desc_handler, 0);
/* enable usb pull-up */
usbd_connect(&usb_core_dev);
while(1)
{
/* get usb vcp receive data */
data_len = usb_vcp_get_rxdata(&usb_core_dev, usb_buffer);
/* send data to hardware usart */
if(data_len > 0)
{
usart_send_data(usb_buffer, data_len);
}
/* if hardware usart received data,usb send data to host */
usart_rx_data_len = usart_receive_data();
if(usart_rx_data_len || send_zero_packet == 1)
{
if(usart_rx_data_len > 0)
send_zero_packet = 1;
if(usart_rx_data_len == 0)
send_zero_packet = 0;
timeout = 50000;
if((hw_usart_read_index + usart_rx_data_len) < usart_buffer_size)
{
do
{
/* send data to host */
if(usb_vcp_send_data(&usb_core_dev, &usart_rx_buffer[hw_usart_read_index], usart_rx_data_len) == SUCCESS)
{
hw_usart_read_index = hw_usart_read_index + usart_rx_data_len;
break;
}
}while(timeout --);
}
/* process the fifo overflow */
else
{
do
{
/* send data to host */
if(usb_vcp_send_data(&usb_core_dev, &usart_rx_buffer[hw_usart_read_index], usart_buffer_size - hw_usart_read_index) == SUCCESS)
{
/* get fifo overflow data count */
ov_cnt = usart_rx_data_len - (usart_buffer_size - hw_usart_read_index);
hw_usart_read_index = 0;
break;
}
}while(timeout --);
timeout = 50000;
do
{
/* send data to host */
if(usb_vcp_send_data(&usb_core_dev, &usart_rx_buffer[hw_usart_read_index], ov_cnt) == SUCCESS)
{
hw_usart_read_index = ov_cnt;
break;
}
}while(timeout --);
}
}
}
}
void usb_usart_config( linecoding_type linecoding)
{
usart_stop_bit_num_type usart_stop_bit;
usart_data_bit_num_type usart_data_bit;
usart_parity_selection_type usart_parity_select;
/* enable the usart2 and gpio clock */
crm_periph_clock_enable(CRM_USART2_PERIPH_CLOCK, FALSE);
crm_periph_clock_enable(CRM_USART2_PERIPH_CLOCK, TRUE);
/* stop bit */
switch(linecoding.format)
{
case 0x0:
usart_stop_bit = USART_STOP_1_BIT;
break;
/* to be used when transmitting and receiving data in smartcard mode */
case 0x1:
usart_stop_bit = USART_STOP_1_5_BIT;
break;
case 0x2:
usart_stop_bit = USART_STOP_2_BIT;
break;
default :
break;
}
/* parity */
switch(linecoding.parity)
{
case 0x0:
usart_parity_select = USART_PARITY_NONE;
break;
case 0x1:
usart_parity_select = USART_PARITY_ODD;
break;
case 0x2:
usart_parity_select = USART_PARITY_EVEN;
break;
/* hardware usart not support partiy for mark and space */
case 0x3:
case 0x4:
break;
default :
break;
}
if(USART_PARITY_NONE == usart_parity_select)
{
/* data bits */
switch(linecoding.data)
{
/* hardware usart not support data bits for 5/6/7 */
case 0x5:
case 0x6:
case 0x7:
break;
case 0x8:
usart_data_bit = USART_DATA_8BITS;
break;
/* hardware usart not support data bits for 16 */
case 0x10:
break;
default :
break;
}
}
else
{
/* data bits */
switch(linecoding.data)
{
/* hardware usart not support data bits for 5/6 */
case 0x5:
case 0x6:
break;
case 0x7:
usart_data_bit = USART_DATA_8BITS;
break;
case 0x8:
usart_data_bit = USART_DATA_9BITS;
break;
/* hardware usart not support data bits for 16 */
case 0x10:
break;
default :
break;
}
}
nvic_irq_enable(USART2_IRQn, 0, 0);
/* configure usart2 param */
usart_init(USART2, linecoding.bitrate, usart_data_bit, usart_stop_bit);
usart_parity_selection_config(USART2, usart_parity_select);
usart_transmitter_enable(USART2, TRUE);
usart_receiver_enable(USART2, TRUE);
/* enable usart2 interrupt */
usart_interrupt_enable(USART2, USART_RDBF_INT, TRUE);
usart_enable(USART2, TRUE);
}
void usart_gpio_config(void)
{
gpio_init_type gpio_init_struct;
crm_periph_clock_enable(CRM_GPIOA_PERIPH_CLOCK, TRUE);
/* configure the usart2 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 = GPIO_PINS_2;
gpio_init_struct.gpio_pull = GPIO_PULL_NONE;
gpio_init(GPIOA, &gpio_init_struct);
/* configure the usart2 rx 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_INPUT;
gpio_init_struct.gpio_pins = GPIO_PINS_3;
gpio_init_struct.gpio_pull = GPIO_PULL_UP;
gpio_init(GPIOA, &gpio_init_struct);
}
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