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Merge branch 'master' of git://github.com/jboone/libopencm3

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TitanMKD 2012-06-16 12:51:44 +02:00
commit d80ee80e06
1 changed files with 26 additions and 0 deletions
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26
lib/lpc43xx/ssp.c
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@ -113,6 +113,21 @@ u16 ssp_read(ssp_num_t ssp_num)
return SSP_DR(ssp_port);
}
void ssp_wait_until_not_busy(ssp_num_t ssp_num)
{
u32 ssp_port;
if(ssp_num == SSP0_NUM)
{
ssp_port = SSP0;
}else
{
ssp_port = SSP1;
}
while( (SSP_SR(ssp_port) & SSP_SR_BSY) );
}
/* This Function Wait Data TX Ready, and Write Data to SSP */
void ssp_write(ssp_num_t ssp_num, u16 data)
{
@ -130,5 +145,16 @@ void ssp_write(ssp_num_t ssp_num, u16 data)
while( (SSP_SR(ssp_port) & SSP_SR_TNF) == 0);
SSP_DR(ssp_port) = data;
/* Wait for not busy, since we're controlling CS# of
* devices manually and need to wait for the data to
* be sent. It may also be important to wait here
* in case we're configuring devices via SPI and also
* with GPIO control -- we need to know when SPI
* commands are effective before altering a device's
* state with GPIO. I'm thinking the MAX2837, for
* example...
*/
ssp_wait_until_not_busy(ssp_num);
}