kopia lustrzana https://github.com/F5OEO/rpitx
129 wiersze
2.9 KiB
C
129 wiersze
2.9 KiB
C
#ifndef RPI_DMA
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#define RPI_DMA
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <errno.h>
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#include <stdarg.h>
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#include <stdint.h>
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#include <ctype.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <sys/mman.h>
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#include "mailbox.h"
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char InitDma(void *FunctionTerminate, int* skipSignals);
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uint32_t mem_virt_to_phys(volatile void *virt);
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uint32_t mem_phys_to_virt(volatile uint32_t phys);
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#define NBSAMPLES_PWM_FREQ_MAX 500
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#define NUM_CB_PWM_FREQUENCY 8
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//#define MBFILE DEVICE_FILE_NAME /* From mailbox.h */
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#define NUM_SAMPLES_MAX (4000)
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#define CBS_SIZE_BY_SAMPLE (3)
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#define NUM_CBS_MAIN ((NUM_SAMPLES_MAX * CBS_SIZE_BY_SAMPLE))
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#define NUM_CBS (NUM_CBS_MAIN)
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#define BCM2708_DMA_SRC_IGNOR (1<<11)
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#define BCM2708_DMA_SRC_INC (1<<8)
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#define BCM2708_DMA_DST_IGNOR (1<<7)
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#define BCM2708_DMA_NO_WIDE_BURSTS (1<<26)
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#define BCM2708_DMA_WAIT_RESP (1<<3)
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#define BCM2708_DMA_D_DREQ (1<<6)
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#define BCM2708_DMA_PER_MAP(x) ((x)<<16)
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#define BCM2708_DMA_END (1<<1)
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#define BCM2708_DMA_RESET (1<<31)
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#define BCM2708_DMA_ABORT (1<<30)
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#define BCM2708_DMA_INT (1<<2)
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#define DMA_CS (0x00/4)
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#define DMA_CONBLK_AD (0x04/4)
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#define DMA_DEBUG (0x20/4)
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#define BUS_TO_PHYS(x) ((x)&~0xC0000000)
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#define DMA_CS_RESET (1<<31)
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#define DMA_CS_ABORT (1<<30)
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#define DMA_CS_DISDEBUG (1<<28)
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#define DMA_CS_END (1<<1)
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#define DMA_CS_ACTIVE (1<<0)
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#define DMA_CS_PRIORITY(x) ((x)&0xf << 16)
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#define DMA_CS_PANIC_PRIORITY(x) ((x)&0xf << 20)
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#define PAGE_SIZE 4096
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#define PAGE_SHIFT 12
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#define NUM_PAGES ((sizeof(struct control_data_s) + PAGE_SIZE - 1) >> PAGE_SHIFT)
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struct {
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int handle; /* From mbox_open() */
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unsigned mem_ref; /* From mem_alloc() */
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unsigned bus_addr; /* From mem_lock() */
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uint8_t *virt_addr; /* From mapmem() */
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} mbox;
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// The GPU reserves channels 1, 3, 6, and 7 (kernel mask dma.dmachans=0x7f35)
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// And, I think sdcard will always get 2 and fbturbo zero
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//8 Crash
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// 5 seems OK, 14 ALSO
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//cat /sys/module/dma/parameters/dmachans
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//On Wheezy
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//32565: 111111100110101
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//On Jessie Pi2:
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//3893 : 111100110101
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// USE CHANNEL 4 AND 5 which seems to be free
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// On Jessie, channel 4 and 5 seems to crash : set to DMA 8 .
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#define DMA_CHANNEL_WHEEZY 14
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#define DMA_CHANNEL_JESSIE 5
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//#define DMA_CHANNEL_PWMFREQUENCY 5
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char DMA_CHANNEL;
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//#define DMA_CHANNEL 8
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#define DMA_CHANNEL_PWMFREQUENCY (DMA_CHANNEL+1)
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typedef struct {
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uint32_t info, src, dst, length,
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stride, next, pad[2];
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} dma_cb_t;
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typedef struct {
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uint8_t *virtaddr;
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uint32_t physaddr;
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} page_map_t;
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page_map_t *page_map;
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uint8_t *virtbase;
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#define PWM_STEP_MAXI 200
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typedef struct {
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uint32_t FrequencyTab[PWM_STEP_MAXI];
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uint32_t Amplitude1;
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uint32_t Amplitude2;
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} sample_t;
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struct control_data_s {
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dma_cb_t cb[NUM_CBS];//+1 ??
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sample_t sample[NUM_SAMPLES_MAX];
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};
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struct control_data_s *ctl;
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#endif
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