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Code Issues Releases Activity

RFM22b: Begin doing blocks of transfers when possible between semaphore claims

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The abstraction should probably be improved but ideally we start using
the DMA SPI transfers for PipX and grabbing/releasing the semaphore less
frequently (e.g. not for each 1-2 bytes).
This commit is contained in:
James Cotton 2012-09-01 21:07:38 -05:00
parent 27fedee3d3
commit 997319ae80
1 changed files with 21 additions and 8 deletions
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29
flight/PiOS/Common/pios_rfm22b.c
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@ -1540,15 +1540,28 @@ static void rfm22_processInt(void)
// Reset the supervisor timer.
rfm22b_dev_g->supv_timer = PIOS_RFM22B_SUPERVISOR_TIMEOUT;
// read interrupt status registers - clears the interrupt line
int_status1 = rfm22_read(RFM22_interrupt_status1);
int_status2 = rfm22_read(RFM22_interrupt_status2);
// 1. Read the interrupt statuses with burst read
rfm22_claimBus(); // Set RC and the semaphore
uint8_t write_buf[3] = {RFM22_interrupt_status1 & 0x7f, 0xFF, 0xFF};
uint8_t read_buf[3];
PIOS_SPI_TransferBlock(PIOS_RFM22_SPI_PORT, write_buf, read_buf, sizeof(write_buf), NULL);
PIOS_SPI_RC_PinSet(PIOS_RFM22_SPI_PORT, 0, 1);
int_status1 = read_buf[1];
int_status2 = read_buf[2];
// Device status
write_buf[0] = RFM22_device_status & 0x7f;
PIOS_SPI_RC_PinSet(PIOS_RFM22_SPI_PORT, 0, 0);
PIOS_SPI_TransferBlock(PIOS_RFM22_SPI_PORT, write_buf, read_buf, 2, NULL);
PIOS_SPI_RC_PinSet(PIOS_RFM22_SPI_PORT, 0, 1);
device_status = read_buf[1];
// read device status register
device_status = rfm22_read(RFM22_device_status);
// read ezmac status register
ezmac_status = rfm22_read(RFM22_ezmac_status);
// EzMAC status
write_buf[0] = RFM22_ezmac_status & 0x7f;
PIOS_SPI_RC_PinSet(PIOS_RFM22_SPI_PORT, 0, 0);
PIOS_SPI_TransferBlock(PIOS_RFM22_SPI_PORT, write_buf, read_buf, 2, NULL);
ezmac_status = read_buf[1];
rfm22_releaseBus();
// Read the RSSI if we're in RX mode
if (rf_mode != TX_DATA_MODE && rf_mode != TX_STREAM_MODE &&