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Fixed restart bug in multi-core Breakout and librified audio (CPU and DMA)

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This commit is contained in:
Adam Greenwood-Byrne 2021-03-04 21:38:51 +00:00
parent 447e41536a
commit c279397cba
6 changed files with 172 additions and 92 deletions
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9
part11-breakout-smp/breakout.c
View file

@ -156,10 +156,10 @@ void moveObject(volatile struct Object *object, int x, int y)
const int ballradius = 15; const int ballradius = 15;
const int paddlewidth = 80; const int paddlewidth = 80;
volatile unsigned char dir = 50; volatile unsigned char dir;
volatile unsigned int numobjs = 0; volatile unsigned int numobjs;
volatile struct Object *objects = (struct Object *)SAFE_ADDRESS; volatile struct Object *objects = (struct Object *)HEAP_ADDRESS;
volatile struct Object *ball; volatile struct Object *ball;
volatile struct Object *paddle; volatile struct Object *paddle;
volatile struct Object *scoreboard; volatile struct Object *scoreboard;
@ -167,6 +167,9 @@ volatile struct Object *endgame;
void breakout_init() void breakout_init()
{ {
numobjs = 0;
dir = 50;
initBricks(); initBricks();
initBall(); initBall();
initPaddle(); initPaddle();

2
part11-breakout-smp/breakout.h
View file

@ -1,5 +1,5 @@
// Heap memory allocation // Heap memory allocation
#define SAFE_ADDRESS 0x00400000 // Somewhere safe to store a lot of data #define HEAP_ADDRESS 0x00400000 // Somewhere safe to store a lot of data
// The screen // The screen
#define WIDTH 1920 #define WIDTH 1920

94
part11-breakout-smp/breakout_snd.c
View file

@ -1,77 +1,14 @@
#include "include/fb.h"
#include "include/io.h"
#include "include/multicore.h" #include "include/multicore.h"
#include "include/audio.h"
#define PWM_BASE (PERIPHERAL_BASE + 0x20C000 + 0x800) /* PWM1 register base address on RPi4 */
#define PWM_LEGACY_BASE (LEGACY_BASE + 0x20C000 + 0x800) /* PWM1 register base legacy address on RPi4 */
#define CLOCK_BASE (PERIPHERAL_BASE + 0x101000)
#define BCM2711_PWMCLK_CNTL 40
#define BCM2711_PWMCLK_DIV 41
#define PM_PASSWORD 0x5A000000
#define BCM2711_PWM_CONTROL 0
#define BCM2711_PWM_STATUS 1
#define BCM2711_PWM_DMAC 2
#define BCM2711_PWM0_RANGE 4
#define BCM2711_PWM0_DATA 5
#define BCM2711_PWM_FIFO 6
#define BCM2711_PWM1_RANGE 8
#define BCM2711_PWM1_DATA 9
#define BCM2711_PWM1_USEFIFO 0x2000 /* Data from FIFO */
#define BCM2711_PWM1_ENABLE 0x0100 /* Channel enable */
#define BCM2711_PWM0_USEFIFO 0x0020 /* Data from FIFO */
#define BCM2711_PWM0_ENABLE 0x0001 /* Channel enable */
#define BCM2711_PWM_ENAB 0x80000000 /* PWM DMA Configuration: DMA Enable (bit 31 set) */
#define BCM2711_GAPO2 0x20
#define BCM2711_GAPO1 0x10
#define BCM2711_RERR1 0x8
#define BCM2711_WERR1 0x4
#define BCM2711_FULL1 0x1
#define ERRORMASK (BCM2711_GAPO2 | BCM2711_GAPO1 | BCM2711_RERR1 | BCM2711_WERR1)
volatile unsigned* clk = (void*)CLOCK_BASE;
volatile unsigned* pwm = (void*)PWM_BASE;
void audio_init(void)
{
gpio_useAsAlt0(40); // Ensure PWM1 is mapped to GPIO 40/41
gpio_useAsAlt0(41);
wait_msec(2);
// Setup clock
*(clk + BCM2711_PWMCLK_CNTL) = PM_PASSWORD | (1 << 5); // Stop clock
wait_msec(2);
int idiv = 2;
*(clk + BCM2711_PWMCLK_DIV) = PM_PASSWORD | (idiv<<12);
*(clk + BCM2711_PWMCLK_CNTL) = PM_PASSWORD | 16 | 1; // Osc + Enable
wait_msec(2);
// Setup PWM
*(pwm + BCM2711_PWM_CONTROL) = 0;
wait_msec(2);
*(pwm+BCM2711_PWM0_RANGE) = 0x264; // 44.1khz, Stereo, 8-bit (54Mhz / 44100 / 2)
*(pwm+BCM2711_PWM1_RANGE) = 0x264;
*(pwm+BCM2711_PWM_CONTROL) =
BCM2711_PWM1_USEFIFO |
BCM2711_PWM1_ENABLE |
BCM2711_PWM0_USEFIFO |
BCM2711_PWM0_ENABLE | 1<<6;
}
void snd_core(void) void snd_core(void)
{ {
clear_core2(); clear_core2();
int i=0; // Initialise the audio
long status; audio_init();
// Write data out to FIFO and loop infinitely
extern unsigned char _binary_bin_audio_bin_start[]; extern unsigned char _binary_bin_audio_bin_start[];
extern unsigned char _binary_bin_audio_bin_size[]; extern unsigned char _binary_bin_audio_bin_size[];
@ -79,24 +16,5 @@ void snd_core(void)
unsigned int size = (long)&_binary_bin_audio_bin_size; unsigned int size = (long)&_binary_bin_audio_bin_size;
unsigned char *data = &(_binary_bin_audio_bin_start[0]); unsigned char *data = &(_binary_bin_audio_bin_start[0]);
// Initialise the audio while (1) audio_play_cpu(data, size);
audio_init();
// Write data out to FIFO and loop infinitely
while (1) {
while (i < size) {
status = *(pwm + BCM2711_PWM_STATUS);
if (!(status & BCM2711_FULL1)) {
*(pwm+BCM2711_PWM_FIFO) = *(data + i);
i++;
*(pwm+BCM2711_PWM_FIFO) = *(data + i);
i++;
}
if ((status & ERRORMASK)) {
*(pwm+BCM2711_PWM_STATUS) = ERRORMASK;
}
}
i=0;
}
} }

59
part11-breakout-smp/include/audio.h Normal file
View file

@ -0,0 +1,59 @@
#include "../include/io.h"
#define PWM_BASE (PERIPHERAL_BASE + 0x20C000 + 0x800) /* PWM1 register base address on RPi4 */
#define PWM_LEGACY_BASE (LEGACY_BASE + 0x20C000 + 0x800) /* PWM1 register base legacy address on RPi4 */
#define CLOCK_BASE (PERIPHERAL_BASE + 0x101000)
#define DMA_BASE (PERIPHERAL_BASE + 0x007100) /* DMA register base address */
#define DMA_ENABLE (DMA_BASE + 0xFF0) /* DMA global enable bits */
#define DMA_ADDRESS 0x00500000 /* A safe address to use for our DMA transfer */
#define BCM2711_PWMCLK_CNTL 40
#define BCM2711_PWMCLK_DIV 41
#define PM_PASSWORD 0x5A000000
#define BCM2711_PWM_CONTROL 0
#define BCM2711_PWM_STATUS 1
#define BCM2711_PWM_DMAC 2
#define BCM2711_PWM0_RANGE 4
#define BCM2711_PWM0_DATA 5
#define BCM2711_PWM_FIFO 6
#define BCM2711_PWM1_RANGE 8
#define BCM2711_PWM1_DATA 9
#define BCM2711_PWM1_USEFIFO 0x2000 /* Data from FIFO */
#define BCM2711_PWM1_ENABLE 0x0100 /* Channel enable */
#define BCM2711_PWM0_USEFIFO 0x0020 /* Data from FIFO */
#define BCM2711_PWM0_ENABLE 0x0001 /* Channel enable */
#define BCM2711_PWM_ENAB 0x80000000 /* PWM DMA Configuration: DMA Enable (bit 31 set) */
#define BCM2711_GAPO2 0x20
#define BCM2711_GAPO1 0x10
#define BCM2711_RERR1 0x8
#define BCM2711_WERR1 0x4
#define BCM2711_FULL1 0x1
#define ERRORMASK (BCM2711_GAPO2 | BCM2711_GAPO1 | BCM2711_RERR1 | BCM2711_WERR1)
#define DMA_CS 0 /* Control/status register offset for DMA channel 0 */
#define DMA_CONBLK_AD 1
#define DMA_EN1 1 << 1 /* Enable DMA engine 1 */
#define DMA_ACTIVE 1 /* Active bit set */
#define DMA_DEST_DREQ 0x40 /* Use DREQ to pace peripheral writes */
#define DMA_PERMAP_1 0x10000 /* PWM1 peripheral for DREQ */
#define DMA_SRC_INC 0x100 /* Increment source address */
struct dma_cb {
unsigned int ti;
unsigned int source_ad;
unsigned int dest_ad;
unsigned int txfr_len;
unsigned int stride;
unsigned int nextconbk;
unsigned int null1;
unsigned int null2;
} __attribute__((aligned(32)));
void audio_init(void);
void audio_play_cpu(unsigned char *data, unsigned int size);
void audio_play_dma(unsigned char *data, unsigned int size);
void audio_wait_dma(void);

1
part11-breakout-smp/include/io.h
View file

@ -1,4 +1,5 @@
#define PERIPHERAL_BASE 0xFE000000 #define PERIPHERAL_BASE 0xFE000000
#define LEGACY_BASE 0x7E000000
void uart_init(); void uart_init();
void uart_writeText(char *buffer); void uart_writeText(char *buffer);

99
part11-breakout-smp/lib/audio.c Normal file
View file

@ -0,0 +1,99 @@
#include "../include/audio.h"
#include "../include/fb.h"
volatile unsigned* clk = (void*)CLOCK_BASE;
volatile unsigned* pwm = (void*)PWM_BASE;
volatile unsigned* dma = (void*)DMA_BASE;
volatile unsigned* dmae = (void*)DMA_ENABLE;
volatile unsigned* safe = (void*)DMA_ADDRESS;
struct dma_cb playback_cb;
void audio_init(void)
{
gpio_useAsAlt0(40); // Ensure PWM1 is mapped to GPIO 40/41
gpio_useAsAlt0(41);
wait_msec(2);
// Setup clock
*(clk + BCM2711_PWMCLK_CNTL) = PM_PASSWORD | (1 << 5); // Stop clock
wait_msec(2);
int idiv = 2;
*(clk + BCM2711_PWMCLK_DIV) = PM_PASSWORD | (idiv<<12);
*(clk + BCM2711_PWMCLK_CNTL) = PM_PASSWORD | 16 | 1; // Osc + Enable
wait_msec(2);
// Setup PWM
*(pwm + BCM2711_PWM_CONTROL) = 0;
wait_msec(2);
*(pwm+BCM2711_PWM0_RANGE) = 0x264; // 44.1khz, Stereo, 8-bit (54Mhz / 44100 / 2)
*(pwm+BCM2711_PWM1_RANGE) = 0x264;
*(pwm+BCM2711_PWM_CONTROL) =
BCM2711_PWM1_USEFIFO |
BCM2711_PWM1_ENABLE |
BCM2711_PWM0_USEFIFO |
BCM2711_PWM0_ENABLE | 1<<6;
}
void audio_play_cpu(unsigned char *data, unsigned int size)
{
int i=0;
long status;
// Write data out to FIFO
while (i < size) {
status = *(pwm + BCM2711_PWM_STATUS);
if (!(status & BCM2711_FULL1)) {
*(pwm+BCM2711_PWM_FIFO) = *(data + i);
i++;
*(pwm+BCM2711_PWM_FIFO) = *(data + i);
i++;
}
if ((status & ERRORMASK)) {
*(pwm+BCM2711_PWM_STATUS) = ERRORMASK;
}
}
}
void audio_play_dma(unsigned char *data, unsigned int size)
{
// Convert data (we expect 8-bit samples, but need to convert them to 32-bit words)
for (int i=0;i<size;i++) *(safe+i) = *(data+i);
wait_msec(2);
// Set up control block
playback_cb.ti = DMA_DEST_DREQ + DMA_PERMAP_1 + DMA_SRC_INC;
playback_cb.source_ad = DMA_ADDRESS;
playback_cb.dest_ad = PWM_LEGACY_BASE + 0x18; // Points to PWM_FIFO
playback_cb.txfr_len = size * 4; // They're unsigned ints now, not unsigned chars
playback_cb.stride = 0x00;
playback_cb.nextconbk = 0x00; // Don't loop
playback_cb.null1 = 0x00;
playback_cb.null2 = 0x00;
wait_msec(2);
// Enable DMA
*(pwm+BCM2711_PWM_DMAC) =
BCM2711_PWM_ENAB + 0x0707; // Bits 0-7 Threshold For DREQ Signal = 1, Bits 8-15 Threshold For PANIC Signal = 0
*dmae = DMA_EN1;
*(dma+DMA_CONBLK_AD) = (long)&playback_cb; // checked and correct
wait_msec(2);
*(dma+DMA_CS) = DMA_ACTIVE;
}
void audio_wait_dma(void)
{
while (*(dma+DMA_CS) & 0x1); // Wait for DMA transfer to finish - we could do anything here instead!
}