rtt-f030/bsp/apollo2/board/pdm.c

272 lines
6.4 KiB
C

/*
* File :_pdm.c
* This file is part of RT-Thread RTOS
* COPYRIGHT (C) 2006 - 2017, RT-Thread Development Team
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Change Logs:
* Date Author Notes
* 2017-12-04 Haley the first version
*/
#include <rtthread.h>
#include <rtdevice.h>
#include "am_mcu_apollo.h"
#include "board.h"
#ifdef RT_USING_PDM
/* sem define */
rt_sem_t pdmsem = RT_NULL;
#define NWA_FRAME_MS 10
#define NWA_FRAME_SAMPLES (16*NWA_FRAME_MS) /* 16k, 16bit, mono audio data */
#define PDM_FIFO_THRESHOLD NWA_FRAME_SAMPLES
#define PDM_GPIO_CLK 22
#define PDM_GPIO_CFG_CLK AM_HAL_PIN_22_PDM_CLK
#define PDM_GPIO_DATA 23
#define PDM_GPIO_CFG_DATA AM_HAL_PIN_23_PDM_DATA
#define PING_PONG_BUF_SIZE 8000*NWA_FRAME_MS
static rt_uint16_t am_pdm_buffer_pool[PING_PONG_BUF_SIZE];
static rt_uint8_t pdm_flag = 0;
static rt_uint16_t pdm_cnt = 0;
static am_hal_pdm_config_t g_sPDMConfig =
{
AM_HAL_PDM_PCFG_LRSWAP_DISABLE | AM_HAL_PDM_PCFG_RIGHT_PGA_P105DB | AM_HAL_PDM_PCFG_LEFT_PGA_P105DB
| AM_HAL_PDM_PCFG_MCLKDIV_DIV1 | AM_HAL_PDM_PCFG_SINC_RATE(48) | AM_HAL_PDM_PCFG_ADCHPD_ENABLE
| AM_HAL_PDM_PCFG_HPCUTOFF(0xB) | AM_HAL_PDM_PCFG_CYCLES(0x1) | AM_HAL_PDM_PCFG_SOFTMUTE_DISABLE
| AM_HAL_PDM_PCFG_PDMCORE_ENABLE, /* Set the PDM configuration */
AM_REG_PDM_VCFG_IOCLKEN_EN | AM_HAL_PDM_VCFG_RSTB_NORMAL | AM_REG_PDM_VCFG_PDMCLKSEL_750KHz
| AM_HAL_PDM_VCFG_PDMCLK_ENABLE | AM_HAL_PDM_VCFG_I2SMODE_DISABLE | AM_HAL_PDM_VCFG_BCLKINV_DISABLE
| AM_HAL_PDM_VCFG_DMICDEL_DISABLE | AM_HAL_PDM_VCFG_SELAP_INTERNAL | AM_HAL_PDM_VCFG_PACK_DISABLE
| AM_HAL_PDM_VCFG_CHANNEL_RIGHT, /* Set the Voice Configuration */
PDM_FIFO_THRESHOLD, /* Select the FIFO PCM sample threshold */
};
/**
* @brief Get the pdm data.
*
* @param None.
*
* This function Get the pdm data.
*
* @return None.
*/
rt_uint8_t am_pdm_data_get(rt_uint8_t *buff, rt_uint16_t size)
{
uint8_t temp;
int i;
/* wait adc interrupt release sem forever */
rt_sem_take(pdmsem, RT_WAITING_FOREVER);
for(i = 0; i < PING_PONG_BUF_SIZE; i++)
{
temp = (uint8_t)(am_pdm_buffer_pool[i] & 0xFF);
/* lower byte */
while ( AM_BFRn(UART, 0, FR, TXFF) );
AM_REGn(UART, 0, DR) = temp;
temp = (uint8_t)((am_pdm_buffer_pool[i] & 0xFF00)>>8);
/* higher byte */
while ( AM_BFRn(UART, 0, FR, TXFF) );
AM_REGn(UART, 0, DR) = temp;
}
/* copy the data */
//rt_memcpy(buff, am_pdm_buffer_pool, size*sizeof(rt_uint16_t));
pdm_flag = 0;
return 0;
}
/**
* @brief Start the pdm.
*
* @param None.
*
* This function Start the pdm.
*
* @return None.
*/
void am_pdm_start(void)
{
/* adcsem create */
pdmsem = rt_sem_create("pdmsem", 0, RT_IPC_FLAG_FIFO);
/* Enable PDM */
am_hal_pdm_enable();
am_hal_interrupt_enable(AM_HAL_INTERRUPT_PDM);
}
/**
* @brief Stop the pdm.
*
* @param None.
*
* This function Stop the pdm.
*
* @return None.
*/
void am_pdm_stop(void)
{
/* Disable PDM */
am_hal_pdm_disable();
am_hal_interrupt_disable(AM_HAL_INTERRUPT_PDM);
/* adcsem delete */
rt_sem_delete(pdmsem);
}
/**
* @brief Get the pdm left gain.
*
* @param None.
*
* This function Get the pdm left gain.
*
* @return gain_val.
*/
uint8_t am_pdm_left_gain_get(void)
{
/* get the left gain */
return am_hal_pdm_left_gain_get();
}
/**
* @brief Set the pdm left gain.
*
* @param None.
*
* This function Set the pdm left gain.
*
* @return None.
*/
void am_pdm_left_gain_set(uint8_t gain_val)
{
/* set the left gain */
am_hal_pdm_left_gain_set(gain_val);
}
/**
* @brief Get the pdm right gain.
*
* @param None.
*
* This function Get the pdm right gain.
*
* @return gain_val.
*/
uint8_t am_pdm_right_gain_get(void)
{
/* get the right gain */
return am_hal_pdm_right_gain_get();
}
/**
* @brief Set the pdm right gain.
*
* @param None.
*
* This function Set the pdm right gain.
*
* @return None.
*/
void am_pdm_right_gain_set(uint8_t gain_val)
{
/* set the right gain */
am_hal_pdm_right_gain_set(gain_val);
}
/**
* @brief Interrupt handler for the PDM
*
* This function is Interrupt handler for the PDM
*
* @return None.
*/
void am_pdm_isr (void)
{
uint32_t ui32FifoData;
int i;
/* Clear the PDM interrupt */
am_hal_pdm_int_clear(AM_HAL_PDM_INT_UNDFL | AM_HAL_PDM_INT_OVF | AM_HAL_PDM_INT_FIFO);
for (i = 0; i < PDM_FIFO_THRESHOLD; i++) /* adjust as needed */
{
ui32FifoData = am_hal_pdm_fifo_data_read();
if(pdm_flag == 0)
{
am_pdm_buffer_pool[pdm_cnt * PDM_FIFO_THRESHOLD + i] = (uint16_t)ui32FifoData;
}
}
if(pdm_flag == 0)
pdm_cnt ++;
if(pdm_cnt == PING_PONG_BUF_SIZE/PDM_FIFO_THRESHOLD) /* 500 means 10 second logging under 8k sampling rate */
{
pdm_cnt = 0;
pdm_flag = 1;
/* release pdmsem */
rt_sem_release(pdmsem);
}
}
/**
* @brief Initialize the PDM
*
* This function initialize the PDM
*
* @return None.
*/
int rt_hw_pdm_init(void)
{
/* Enable power to modules used */
am_hal_pwrctrl_periph_enable(AM_HAL_PWRCTRL_PDM);
/* Enable the PDM clock and data */
am_hal_gpio_pin_config(PDM_GPIO_CLK, PDM_GPIO_CFG_CLK | AM_HAL_GPIO_HIGH_DRIVE);
am_hal_gpio_pin_config(PDM_GPIO_DATA, PDM_GPIO_CFG_DATA );
/* PDM setting */
am_hal_pdm_config(&g_sPDMConfig);
/* Enable PDM interrupts */
am_hal_pdm_int_enable(AM_HAL_PDM_INT_FIFO);
/* Clear PDM interrupts */
am_hal_pdm_int_clear(AM_HAL_PDM_INT_UNDFL | AM_HAL_PDM_INT_OVF | AM_HAL_PDM_INT_FIFO);
rt_kprintf("pdm_init!\n");
return 0;
}
#ifdef RT_USING_COMPONENTS_INIT
INIT_BOARD_EXPORT(rt_hw_pdm_init);
#endif
#endif
/*@}*/