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Merge pull request #6070 from thomaseichinger/pr/cc2420_fix_empty_fifo_read

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drivers/cc2420: adapt FIFO access to recent msp430 SPI changes
This commit is contained in:
Francisco Acosta 2016-11-08 12:39:38 +01:00 committed by GitHub
commit 5cddbfc661
1 changed files with 6 additions and 3 deletions
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9
drivers/cc2420/cc2420.c
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@ -217,7 +217,7 @@ int cc2420_rx(cc2420_t *dev, uint8_t *buf, size_t max_len, void *info)
{
uint8_t len;
/* get the packet length (without dropping it) (first byte in RX FIFO */
/* get the packet length (without dropping it) (first byte in RX FIFO) */
cc2420_ram_read(dev, CC2420_RAM_RXFIFO, &len, 1);
len -= 2; /* subtract RSSI and FCF */
@ -227,10 +227,13 @@ int cc2420_rx(cc2420_t *dev, uint8_t *buf, size_t max_len, void *info)
/* if a buffer is given, read (and drop) the packet */
if (buf) {
/* We could the drop length byte here, msp430 platforms don't allow
* empty reads so we don't do it and read the length byte again. */
cc2420_fifo_read(dev, &len, 1);
len -=2; /* subtract RSSI and FCF */
len = (len > max_len) ? max_len : len;
/* drop length byte */
cc2420_fifo_read(dev, NULL, 1);
/* read fifo contents */
DEBUG("cc2420: recv: reading %i byte of the packet\n", (int)len);
cc2420_fifo_read(dev, buf, len);