ereader_m33.h

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#pragma once
 
#include <stdint.h>
 
#include "ra8_board_ek_ra8d2_dualcore.h"
 
#ifdef __cplusplus
extern "C" {
#endif

typedef enum : uintptr_t {
  k_erm33_mailbox_addr = (uintptr_t)k_ra8_board_shared_ram_base, 
} erm33_mailbox_addr_t;

/* HUM Ch 5.1 "Address Space" Table 5.1 p 239 -- external SDRAM window at 0x68000000 */
typedef enum : uintptr_t {
  k_erm33_sdram_base = 0x68000000U, 
  k_erm33_sdram_end  = 0x6C000000U, 
} erm33_sdram_addr_t;

typedef enum : uint32_t {
  k_erm33_fb_width  = 256U,   
  k_erm33_fb_height = 64U,    
  k_erm33_fb_bpp    = 2U,     
  k_erm33_fb_stride = 512U,   
  k_erm33_fb_bytes  = 32768U, 
  k_erm33_fb_cols   = 32U,    
  k_erm33_fb_rows   = 4U,     
} erm33_fb_geom_t;

typedef enum : uint32_t {
  k_erm33_magic              = 0x45524D33U, 
  k_erm33_m33_sig            = 0x33524452U, 
  k_erm33_status_running     = 0U,          
  k_erm33_status_ok          = 1U,          
  k_erm33_status_bad_book    = 2U,          
  k_erm33_status_render_fail = 3U,          
  k_erm33_fb_format_rgb565   = 2U,          
  k_erm33_page_chars         = 128U,        
} erm33_const_t;

typedef enum : uint32_t {
  k_erm33_max_turns   = 3U,    
  k_erm33_touch_dwell = 4096U, 
} erm33_cycle_t;

typedef struct {
  volatile uint32_t magic;       
  volatile uint32_t m33_sig;     
  volatile uint32_t status;      
  volatile uint32_t fb_base;     
  volatile uint32_t fb_width;    
  volatile uint32_t fb_height;   
  volatile uint32_t fb_stride;   
  volatile uint32_t fb_format;   
  volatile uint32_t fb_crc;      
  volatile uint32_t glyph_count; 
  volatile uint32_t done;        
  volatile uint32_t turn_req;    
  volatile uint32_t turn_ack;    
  volatile uint32_t turn_done;   
} erm33_mailbox_t;

static inline volatile erm33_mailbox_t* erm33_mailbox(void)
{
  return (volatile erm33_mailbox_t*)(uintptr_t)k_erm33_mailbox_addr;
}
 
#ifdef __cplusplus
}
#endif