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Changed to monitor the UART transmitter buffer ready flag instead of the UART transmitter empty flag. This almost doubles the speed of transmitting data to CC2420. Patch by James Brown.

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This commit is contained in:
nifi 2009-08-31 12:06:34 +00:00
parent ebd91b9f9d
commit 3a8ee769cb
3 changed files with 32 additions and 26 deletions
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43
platform/sky/dev/xmem.c
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@ -26,7 +26,7 @@
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)$Id: xmem.c,v 1.8 2009/05/11 15:26:24 nvt-se Exp $
* @(#)$Id: xmem.c,v 1.9 2009/08/31 12:06:35 nifi Exp $
*/
/**
@ -70,12 +70,6 @@
#define SPI_FLASH_INS_RES 0xab
/*---------------------------------------------------------------------------*/
static void
spi_tx(unsigned byte)
{
FASTSPI_TX(byte);
}
/*---------------------------------------------------------------------------*/
static void
write_enable(void)
{
int s;
@ -83,7 +77,8 @@ write_enable(void)
s = splhigh();
SPI_FLASH_ENABLE();
spi_tx(SPI_FLASH_INS_WREN);
FASTSPI_TX(SPI_FLASH_INS_WREN);
SPI_WAITFOREOTx();
SPI_FLASH_DISABLE();
splx(s);
@ -99,7 +94,8 @@ read_status_register(void)
s = splhigh();
SPI_FLASH_ENABLE();
spi_tx(SPI_FLASH_INS_RDSR);
FASTSPI_TX(SPI_FLASH_INS_RDSR);
SPI_WAITFOREOTx();
FASTSPI_CLEAR_RX();
FASTSPI_RX(u);
@ -137,10 +133,11 @@ erase_sector(unsigned long offset)
s = splhigh();
SPI_FLASH_ENABLE();
spi_tx(SPI_FLASH_INS_SE);
spi_tx(offset >> 16); /* MSB */
spi_tx(offset >> 8);
spi_tx(offset >> 0); /* LSB */
FASTSPI_TX(SPI_FLASH_INS_SE);
FASTSPI_TX(offset >> 16); /* MSB */
FASTSPI_TX(offset >> 8);
FASTSPI_TX(offset >> 0); /* LSB */
SPI_WAITFOREOTx();
SPI_FLASH_DISABLE();
splx(s);
@ -174,10 +171,11 @@ xmem_pread(void *_p, int size, unsigned long offset)
s = splhigh();
SPI_FLASH_ENABLE();
spi_tx(SPI_FLASH_INS_READ);
spi_tx(offset >> 16); /* MSB */
spi_tx(offset >> 8);
spi_tx(offset >> 0); /* LSB */
FASTSPI_TX(SPI_FLASH_INS_READ);
FASTSPI_TX(offset >> 16); /* MSB */
FASTSPI_TX(offset >> 8);
FASTSPI_TX(offset >> 0); /* LSB */
SPI_WAITFOREOTx();
FASTSPI_CLEAR_RX();
for(; p < end; p++) {
@ -207,14 +205,15 @@ program_page(unsigned long offset, const unsigned char *p, int nbytes)
s = splhigh();
SPI_FLASH_ENABLE();
spi_tx(SPI_FLASH_INS_PP);
spi_tx(offset >> 16); /* MSB */
spi_tx(offset >> 8);
spi_tx(offset >> 0); /* LSB */
FASTSPI_TX(SPI_FLASH_INS_PP);
FASTSPI_TX(offset >> 16); /* MSB */
FASTSPI_TX(offset >> 8);
FASTSPI_TX(offset >> 0); /* LSB */
for(; p < end; p++) {
spi_tx(~*p);
FASTSPI_TX(~*p);
}
SPI_WAITFOREOTx();
SPI_FLASH_DISABLE();
splx(s);