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code optimization

This commit is contained in:
olikraus 2016-05-15 10:04:49 +02:00
parent ebfaf993d4
commit 8a495f9aaf
1 changed files with 14 additions and 11 deletions
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25
csrc/u8x8_cad.c
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@ -275,6 +275,15 @@ uint8_t u8x8_cad_st7920_spi(u8x8_t *u8x8, uint8_t msg, uint8_t arg_int, void *ar
/* u8x8_byte_SetDC is not used */
/* U8X8_MSG_BYTE_START_TRANSFER starts i2c transfer, U8X8_MSG_BYTE_END_TRANSFER stops transfer */
static void u8x8_i2c_data_transfer(u8x8_t *u8x8, uint8_t arg_int, void *arg_ptr) U8X8_NOINLINE;
static void u8x8_i2c_data_transfer(u8x8_t *u8x8, uint8_t arg_int, void *arg_ptr)
{
u8x8_byte_StartTransfer(u8x8);
u8x8_byte_SendByte(u8x8, 0x040);
u8x8->byte_cb(u8x8, U8X8_MSG_CAD_SEND_DATA, arg_int, arg_ptr);
u8x8_byte_EndTransfer(u8x8);
}
uint8_t u8x8_cad_ssd13xx_i2c(u8x8_t *u8x8, uint8_t msg, uint8_t arg_int, void *arg_ptr)
{
switch(msg)
@ -292,25 +301,19 @@ uint8_t u8x8_cad_ssd13xx_i2c(u8x8_t *u8x8, uint8_t msg, uint8_t arg_int, void *a
//u8x8_byte_SetDC(u8x8, 1);
/* the FeatherWing OLED with the 32u4 transfer of long byte */
/* streams was not possible. This is why this is broken down to */
/* streams was not possible. This is broken down to */
/* smaller streams, 32 seems to be the limit... */
/* I guess this is related to the size of the Wire buffers in Arduino */
/* Unfortunately, this can not be handled in the lower level drivers, */
/* Unfortunately, this can not be handled in the byte level drivers, */
/* so this is done here. Even further, only 24 bytes will be sent, */
/* because there will be another byte (DC) required before the transfer */
/* because there will be another byte (DC) required during the transfer */
while( arg_int > 24 )
{
u8x8_byte_StartTransfer(u8x8);
u8x8_byte_SendByte(u8x8, 0x040);
u8x8->byte_cb(u8x8, msg, 24, arg_ptr);
u8x8_byte_EndTransfer(u8x8);
u8x8_i2c_data_transfer(u8x8, 24, arg_ptr);
arg_int-=24;
arg_ptr+=24;
}
u8x8_byte_StartTransfer(u8x8);
u8x8_byte_SendByte(u8x8, 0x040);
u8x8->byte_cb(u8x8, msg, arg_int, arg_ptr);
u8x8_byte_EndTransfer(u8x8);
u8x8_i2c_data_transfer(u8x8, arg_int, arg_ptr);
break;
case U8X8_MSG_CAD_INIT:
/* apply default i2c adr if required so that the start transfer msg can use this */