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#include "at32f403a_407_board.h"
#include "at32f403a_407_clock.h"
#include <stdio.h>
static void i2s_config(i2s_data_channel_format_type format, i2s_audio_sampling_freq_type freq)
{
i2s_init_type i2s_init_struct;
/* master i2s initialization */
crm_periph_clock_enable(CRM_SPI3_PERIPH_CLOCK, TRUE);
nvic_irq_enable(SPI3_I2S3EXT_IRQn, 0, 0);
spi_i2s_reset(SPI3);
i2s_default_para_init(&i2s_init_struct);
/* master transmission mode */
i2s_init_struct.audio_protocol = I2S_AUDIO_PROTOCOL_PHILLIPS;
i2s_init_struct.data_channel_format = format;
i2s_init_struct.mclk_output_enable = TRUE;
i2s_init_struct.audio_sampling_freq = freq;
i2s_init_struct.clock_polarity = I2S_CLOCK_POLARITY_LOW;
i2s_init_struct.operation_mode = I2S_MODE_MASTER_TX;
i2s_init(SPI3, &i2s_init_struct);
/* enable transmit data buffer empty interrupt */
spi_i2s_interrupt_enable(SPI3, SPI_I2S_TDBE_INT, TRUE);
/* slave i2s initialization */
crm_periph_clock_enable(CRM_SPI2_PERIPH_CLOCK, TRUE);
nvic_irq_enable(SPI2_I2S2EXT_IRQn, 0, 0);
spi_i2s_reset(SPI2);
/* slave reception mode */
i2s_init_struct.audio_protocol = I2S_AUDIO_PROTOCOL_PHILLIPS;
i2s_init_struct.data_channel_format = format;
i2s_init_struct.mclk_output_enable = TRUE;
i2s_init_struct.audio_sampling_freq = freq;
i2s_init_struct.clock_polarity = I2S_CLOCK_POLARITY_LOW;
i2s_init_struct.operation_mode =I2S_MODE_SLAVE_RX;
i2s_init(SPI2, &i2s_init_struct);
/* enable receive data buffer full interrupt */
spi_i2s_interrupt_enable(SPI2, SPI_I2S_RDBF_INT, TRUE);
}
static void gpio_config(void)
{
gpio_init_type gpio_initstructure;
crm_periph_clock_enable(CRM_GPIOA_PERIPH_CLOCK, TRUE);
crm_periph_clock_enable(CRM_GPIOB_PERIPH_CLOCK, TRUE);
crm_periph_clock_enable(CRM_GPIOC_PERIPH_CLOCK, TRUE);
crm_periph_clock_enable(CRM_IOMUX_PERIPH_CLOCK, TRUE);
gpio_pin_remap_config(SWJTAG_GMUX_010, TRUE);
/* master i2s ws pin */
gpio_initstructure.gpio_out_type = GPIO_OUTPUT_PUSH_PULL;
gpio_initstructure.gpio_pull = GPIO_PULL_UP;
gpio_initstructure.gpio_mode = GPIO_MODE_MUX;
gpio_initstructure.gpio_drive_strength = GPIO_DRIVE_STRENGTH_STRONGER;
gpio_initstructure.gpio_pins = GPIO_PINS_15;
gpio_init(GPIOA, &gpio_initstructure);
/* master i2s ck pin */
gpio_initstructure.gpio_pull = GPIO_PULL_DOWN;
gpio_initstructure.gpio_mode = GPIO_MODE_MUX;
gpio_initstructure.gpio_pins = GPIO_PINS_3;
gpio_init(GPIOB, &gpio_initstructure);
/* master i2s sd pin */
gpio_initstructure.gpio_pull = GPIO_PULL_UP;
gpio_initstructure.gpio_mode = GPIO_MODE_MUX;
gpio_initstructure.gpio_pins = GPIO_PINS_5;
gpio_init(GPIOB, &gpio_initstructure);
/* master i2s mck pin */
gpio_initstructure.gpio_pull = GPIO_PULL_UP;
gpio_initstructure.gpio_mode = GPIO_MODE_MUX;
gpio_initstructure.gpio_pins = GPIO_PINS_7;
gpio_init(GPIOC, &gpio_initstructure);
/* slave i2s ws pin */
gpio_initstructure.gpio_out_type = GPIO_OUTPUT_PUSH_PULL;
gpio_initstructure.gpio_pull = GPIO_PULL_UP;
gpio_initstructure.gpio_mode = GPIO_MODE_INPUT;
gpio_initstructure.gpio_drive_strength = GPIO_DRIVE_STRENGTH_STRONGER;
gpio_initstructure.gpio_pins = GPIO_PINS_12;
gpio_init(GPIOB, &gpio_initstructure);
/* slave i2s ck pin */
gpio_initstructure.gpio_pull = GPIO_PULL_DOWN;
gpio_initstructure.gpio_mode = GPIO_MODE_INPUT;
gpio_initstructure.gpio_pins = GPIO_PINS_13;
gpio_init(GPIOB, &gpio_initstructure);
/* slave i2s sd pin */
gpio_initstructure.gpio_pull = GPIO_PULL_UP;
gpio_initstructure.gpio_mode = GPIO_MODE_INPUT;
gpio_initstructure.gpio_pins = GPIO_PINS_15;
gpio_init(GPIOB, &gpio_initstructure);
}
int main(void)
{
__IO uint32_t index = 0;
nvic_priority_group_config(NVIC_PRIORITY_GROUP_4);
system_clock_config();
at32_board_init();
at32_led_on(LED4);
gpio_config();
i2s_config(I2S_DATA_16BIT_CHANNEL_32BIT, I2S_AUDIO_FREQUENCY_48K);
/* enable slave and master i2s to start communication */
i2s_enable(SPI2, TRUE);
i2s_enable(SPI3, TRUE);
/* wait data receive end */
while(rx_index < 32);
/* wait master and slave idle when communication end */
while(spi_i2s_flag_get(SPI3, SPI_I2S_BF_FLAG) != RESET);
while(spi_i2s_flag_get(SPI2, SPI_I2S_BF_FLAG) != RESET);
/* test result:the data check */
transfer_status1 = buffer_compare(i2s2_buffer_rx, i2s3_buffer_tx, 32);
/* receive buffer clear */
tx_index = 0;
rx_index = 0;
for(index = 0; index < 32; index++)
{
i2s2_buffer_rx[index] = 0;
}
/* change frame format */
i2s_config(I2S_DATA_24BIT_CHANNEL_32BIT, I2S_AUDIO_FREQUENCY_16K);
/* enable slave and master i2s to start communication */
i2s_enable(SPI2, TRUE);
i2s_enable(SPI3, TRUE);
/* wait data receive end */
while(rx_index < 32);
/* wait master and slave idle when communication end */
while(spi_i2s_flag_get(SPI3, SPI_I2S_BF_FLAG) != RESET);
while(spi_i2s_flag_get(SPI2, SPI_I2S_BF_FLAG) != RESET);
/* test result:the data check */
transfer_status2 = buffer_compare_24bits(i2s2_buffer_rx, i2s3_buffer_tx, 32);
/* test result indicate:if passed ,led2 lights */
if((transfer_status1 == SUCCESS) && (transfer_status2 == SUCCESS))
{
at32_led_on(LED2);
}
else
{
at32_led_on(LED3);
}
while(1)
{
}
}
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