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#include "project.h"
#define DMA_BUF_SZ (2 + (SSD1306_VRAM_SIZE))
uint8_t dma_buf[DMA_BUF_SZ];
uint8_t update_buf[DMA_BUF_SZ];
static int dma_in_progress = 0;
static int refresh_enabled = 0;
static uint32_t refresh_wdt = 0;
int
ssd1306_cmds (uint8_t * buf, size_t len, int delay)
{
while (i2c_lock ());
i2cp_start_transaction (SSD1306_I2C_ADDRESS, I2C_WRITE);
i2cp_send (SSD1306_COMMAND);
while (len--)
i2cp_send (*(buf++));
i2cp_stop ();
if (delay)
delay_us (delay);
i2c_unlock ();
return 0;
}
int
ssd1306_cmd (uint8_t cmd, int delay)
{
return ssd1306_cmds (&cmd, 1, delay);
}
static void
start_dma (void)
{
uint8_t cmds[] = {
SSD1306_SET_PAGE_ADDR, 0, 0xff,
SSD1306_SET_COLUMN_ADDR, 0, SSD1306_WIDTH - 1
};
if (dma_in_progress)
return;
refresh_wdt = 0;
dma_in_progress = 1;
memcpy (dma_buf, update_buf, DMA_BUF_SZ);
ssd1306_cmds (cmds, sizeof (cmds), 0);
i2cp_start_transaction (SSD1306_I2C_ADDRESS, I2C_WRITE);
i2cp_start_dma (dma_buf, DMA_BUF_SZ);
}
void
dma1_channel6_isr (void)
{
if (dma_in_progress)
{
i2cp_stop_dma ();
i2cp_stop ();
dma_in_progress = 0;
}
if (refresh_enabled)
start_dma ();
}
void
oled_refresh_wdt (void)
{
if (!refresh_enabled)
return;
refresh_wdt++;
if (refresh_wdt < 1000)
return;
refresh_wdt = 0;
/*No refresh for 1s, restart everything */
i2cp_stop_dma ();
i2cp_stop ();
dma_in_progress = 0;
start_dma ();
}
static void
dma_generate_stream (void)
{
memset (update_buf, 0, DMA_BUF_SZ);
update_buf[0] = SSD1306_DATA_CONTINUE;
}
void
oled_enable_refresh (void)
{
refresh_enabled = 1;
start_dma ();
}
void
oled_disable_refresh (void)
{
refresh_enabled = 0;
while (dma_in_progress);
}
void
oled_cls (void)
{
memset (update_buf + 1, 0, SSD1306_VRAM_SIZE);
}
void
oled_on (void)
{
ssd1306_cmd (SSD1306_DISPLAY_ON, 0);
}
void
oled_off (void)
{
ssd1306_cmd (SSD1306_DISPLAY_OFF, 0);
}
void
oled_squirt (void)
{
unsigned i;
uint8_t cmds[] = {
SSD1306_SET_PAGE_ADDR, 0, 0xff,
SSD1306_SET_COLUMN_ADDR, 0, SSD1306_WIDTH - 1
};
ssd1306_cmds (cmds, sizeof (cmds), 0);
while (i2c_lock ());
i2cp_start_transaction (SSD1306_I2C_ADDRESS, I2C_WRITE);
for (i = 0; i < DMA_BUF_SZ; ++i)
i2cp_send (update_buf[i]);
i2cp_stop ();
i2c_unlock ();
}
void
oled_reset (void)
{
uint8_t init[] = {
SSD1306_DISPLAY_OFF,
SSD1306_SET_DISPLAY_CLOCK_DIV_RATIO, 0x80,
SSD1306_SET_MULTIPLEX_RATIO, SSD1306_HEIGHT - 1,
SSD1306_SET_DISPLAY_OFFSET, 0x0,
SSD1306_SET_START_LINE | 0x0,
SSD1306_CHARGE_PUMP, 0x14,
SSD1306_MEMORY_ADDR_MODE, 0x00,
SSD1306_SET_SEGMENT_REMAP | 0x1,
SSD1306_COM_SCAN_DIR_DEC,
//SSD1306_SET_COM_PINS, 0x12,
SSD1306_SET_COM_PINS, 0x02,
//SSD1306_SET_CONTRAST_CONTROL, 0xCF,
SSD1306_SET_CONTRAST_CONTROL, 0x8F,
SSD1306_SET_PRECHARGE_PERIOD, 0xF1,
SSD1306_SET_VCOM_DESELECT, 0x40,
SSD1306_DISPLAY_ALL_ON_RESUME,
SSD1306_NORMAL_DISPLAY,
SSD1306_DISPLAY_ON,
};
ssd1306_cmds (init, sizeof (init), 0);
}
void
oled_const_strip (int x, int xe, uint8_t and, uint8_t or)
{
uint8_t r;
for (x++; x <= xe; ++x)
{
r = update_buf[x] & and;
update_buf[x] = r | or;
}
}
void
oled_blit_strip (int x, int xe, uint8_t mask, int shift, uint8_t * src)
{
uint8_t r, s;
if (shift > 0)
{
for (x++; x <= xe; ++x)
{
s = *(src++);
s <<= shift;
s &= mask;
r = update_buf[x] & ~mask;
update_buf[x] = r | s;
}
}
else if (shift < 0)
{
shift = -shift;
for (x++; x <= xe; ++x)
{
s = *(src++);
s >>= shift;
s &= mask;
r = update_buf[x] & ~mask;
update_buf[x] = r | s;
}
}
else
{
for (x++; x <= xe; ++x)
{
s = *(src++);
s &= mask;
r = update_buf[x] & ~mask;
update_buf[x] = r | s;
}
}
}
void
oled_init ()
{
oled_reset ();
delay_us (100);
dma_generate_stream ();
nvic_enable_irq (NVIC_DMA1_CHANNEL6_IRQ);
oled_enable_refresh ();
}
void
oled_shutdown (void)
{
oled_disable_refresh ();
oled_off ();
}
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