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// #========================================================================
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// #
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// # i2s_audio_FIQ.S
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// #
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// # FIQ handler for EB7209 audio stream
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// #
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// #========================================================================
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// ####ECOSGPLCOPYRIGHTBEGIN####
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// -------------------------------------------
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// This file is part of eCos, the Embedded Configurable Operating System.
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// Copyright (C) 1998, 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
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//
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// eCos is free software; you can redistribute it and/or modify it under
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// the terms of the GNU General Public License as published by the Free
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// Software Foundation; either version 2 or (at your option) any later
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// version.
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//
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// eCos is distributed in the hope that it will be useful, but WITHOUT
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// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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// for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with eCos; if not, write to the Free Software Foundation, Inc.,
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// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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//
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// As a special exception, if other files instantiate templates or use
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// macros or inline functions from this file, or you compile this file
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// and link it with other works to produce a work based on this file,
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// this file does not by itself cause the resulting work to be covered by
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// the GNU General Public License. However the source code for this file
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// must still be made available in accordance with section (3) of the GNU
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// General Public License v2.
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//
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// This exception does not invalidate any other reasons why a work based
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// on this file might be covered by the GNU General Public License.
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// -------------------------------------------
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// ####ECOSGPLCOPYRIGHTEND####
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// #========================================================================
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// ######DESCRIPTIONBEGIN####
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// #
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// # Author(s): gthomas
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// # Contributors: gthomas
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// # Date: 1999-09-10
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// # Purpose: Support EB7209 audio interrupts
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// # Description: This routine will send data to the audio FIFOs.
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// #
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// #####DESCRIPTIONEND####
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// #
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// #========================================================================
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#include
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// .file "i2s_audio_FIQ.S"
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.extern cur_buf
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.extern next_buf
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// These defines must mimic the data structure used by the main program
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#define audio_buf_left_ptr 0x0
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#define audio_buf_right_ptr 0x4
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#define audio_buf_length 0x8
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.code 32
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.text
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// Note: when handling an FIQ, registers r8-r14 are free to use
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// since they are unique (banked).
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.globl i2s_FIQ
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i2s_FIQ:
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ldr r11,=FIQ_count
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ldr r12,[r11]
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add r12,r12,#1
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str r12,[r11]
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ldr r11,=I2S_LEFT_FIFO
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ldr r12,=I2S_RIGHT_FIFO
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// Empty the record FIFOs
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// Note: without this, the audio hardware gets stuck
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ldr r13,[r11]
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ldr r13,[r12]
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ldr r13,[r11]
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ldr r13,[r12]
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ldr r13,[r11]
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ldr r13,[r12]
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ldr r13,[r11]
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ldr r13,[r12]
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// See if there is a buffer to play
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ldr r8,=cur_buf
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ldr r9,[r8,#audio_buf_length]
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cmp r9,#0
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beq 05f
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ldr r9,[r8,#audio_buf_left_ptr]
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ldr r10,[r8,#audio_buf_right_ptr]
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// Move 4 [16-bit] values to each FIFO
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ldrh r13,[r9],#2
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str r13,[r11]
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ldrh r13,[r10],#2
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str r13,[r12]
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ldrh r13,[r9],#2
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str r13,[r11]
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ldrh r13,[r10],#2
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str r13,[r12]
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ldrh r13,[r9],#2
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str r13,[r11]
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ldrh r13,[r10],#2
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str r13,[r12]
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ldrh r13,[r9],#2
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str r13,[r11]
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ldrh r13,[r10],#2
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str r13,[r12]
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// Update pointers
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str r9,[r8,#audio_buf_left_ptr]
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str r10,[r8,#audio_buf_right_ptr]
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// Update count
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ldr r9,[r8,#audio_buf_length]
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sub r9,r9,#4
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str r9,[r8,#audio_buf_length]
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cmp r9,#0
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bgt 10f
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// Switch to next buffer
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05: ldr r9,=next_buf
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ldr r10,[r9,#audio_buf_left_ptr]
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str r10,[r8,#audio_buf_left_ptr]
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ldr r10,[r9,#audio_buf_right_ptr]
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str r10,[r8,#audio_buf_right_ptr]
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ldr r10,[r9,#audio_buf_length]
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str r10,[r8,#audio_buf_length]
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mov r13,#0
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str r13,[r9,#audio_buf_length] // Free buffer
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cmp r10,#0
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bne 10f
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// Disable further interrupts
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ldr r8,=INTMR3
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ldr r9,[r8]
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bic r9,r9,#INTSR3_I2SINT
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str r9,[r8]
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10:
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ldr r11,=I2S_STAT // Clear status bits
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// ldr r10,=(I2S_STAT_RCTSR|I2S_STAT_RCRS|I2S_STAT_LCTSR|I2S_STAT_LCRSR|I2S_STAT_RCTNF|I2S_STAT_RCRNE|I2S_STAT_LCTNF|I2S_STAT_LCRNE)
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ldr r10,=0xFFF0F
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str r10,[r11]
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subs pc,lr,#4 // return from interrupt
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.global hal_disable_interrupts
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hal_disable_interrupts:
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mrs r0,cpsr // current state
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orr r1,r0,#0x80 // mask IRQ
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msr cpsr,r1
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bx lr // exit, _old_ in r0
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.data
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.global FIQ_count
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FIQ_count:
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.long 0
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