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Make sure that we send out empty bytes when receiving multiple bytes

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Also fixed some comments
This commit is contained in:
Kristian Lauszus 2014-08-03 18:01:55 +02:00
parent e132b5f4ca
commit 963c157bc5
1 changed files with 3 additions and 2 deletions
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5
usbhost.h
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@ -236,7 +236,7 @@ uint8_t MAX3421e< SPI_SS, INTR >::regRd(uint8_t reg) {
SPI_SS::Set();
#elif USING_SPI4TEENSY3
spi4teensy3::send(reg);
uint8_t rv = spi4teensy3::receive(); // Send empty byte
uint8_t rv = spi4teensy3::receive();
SPI_SS::Set();
#else
SPDR = reg;
@ -266,6 +266,7 @@ uint8_t* MAX3421e< SPI_SS, INTR >::bytesRd(uint8_t reg, uint8_t nbytes, uint8_t*
#if SPI_HAS_TRANSACTION
SPI.transfer(reg);
memset(data_p, 0, nbytes); // Make sure we send out empty bytes
SPI.transfer(data_p, nbytes);
data_p += nbytes;
#elif USING_SPI4TEENSY3
@ -282,7 +283,7 @@ uint8_t* MAX3421e< SPI_SS, INTR >::bytesRd(uint8_t reg, uint8_t nbytes, uint8_t*
SPDR = reg;
while(!(SPSR & (1 << SPIF))); //wait
while(nbytes) {
SPDR = 0; //send empty byte
SPDR = 0; // Send empty byte
nbytes--;
while(!(SPSR & (1 << SPIF)));
#if 0