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author | px4dev <px4@purgatory.org> | 2013-07-06 00:16:37 -0700 |
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committer | px4dev <px4@purgatory.org> | 2013-07-06 00:16:37 -0700 |
commit | 87a4f1507a3bca4bcae870b13ff5416669ededf0 (patch) | |
tree | 1110602072d43a222b1eed20ad5a5d69cea59ef8 /src/drivers/px4io/interface_serial.cpp | |
parent | 19b2e1de8505be6ab23bedab7b105a20ac7af405 (diff) | |
download | px4-firmware-87a4f1507a3bca4bcae870b13ff5416669ededf0.tar.gz px4-firmware-87a4f1507a3bca4bcae870b13ff5416669ededf0.tar.bz2 px4-firmware-87a4f1507a3bca4bcae870b13ff5416669ededf0.zip |
Move the common definitions for the PX4IO serial protocol into the shared header.
Diffstat (limited to 'src/drivers/px4io/interface_serial.cpp')
-rw-r--r-- | src/drivers/px4io/interface_serial.cpp | 81 |
1 files changed, 2 insertions, 79 deletions
diff --git a/src/drivers/px4io/interface_serial.cpp b/src/drivers/px4io/interface_serial.cpp index 7e4a54ea5..7e0eb1926 100644 --- a/src/drivers/px4io/interface_serial.cpp +++ b/src/drivers/px4io/interface_serial.cpp @@ -69,18 +69,6 @@ #include "interface.h" -#define PKT_MAX_REGS 32 // by agreement w/IO - -#pragma pack(push, 1) -struct IOPacket { - uint8_t count_code; - uint8_t crc; - uint8_t page; - uint8_t offset; - uint16_t regs[PKT_MAX_REGS]; -}; -#pragma pack(pop) - /* serial register accessors */ #define REG(_x) (*(volatile uint32_t *)(PX4IO_SERIAL_BASE + _x)) #define rSR REG(STM32_USART_SR_OFFSET) @@ -91,22 +79,6 @@ struct IOPacket { #define rCR3 REG(STM32_USART_CR3_OFFSET) #define rGTPR REG(STM32_USART_GTPR_OFFSET) -#define PKT_CODE_READ 0x00 /* FMU->IO read transaction */ -#define PKT_CODE_WRITE 0x40 /* FMU->IO write transaction */ -#define PKT_CODE_SUCCESS 0x00 /* IO->FMU success reply */ -#define PKT_CODE_CORRUPT 0x40 /* IO->FMU bad packet reply */ -#define PKT_CODE_ERROR 0x80 /* IO->FMU register op error reply */ - -#define PKT_CODE_MASK 0xc0 -#define PKT_COUNT_MASK 0x3f - -#define PKT_COUNT(_p) ((_p).count_code & PKT_COUNT_MASK) -#define PKT_CODE(_p) ((_p).count_code & PKT_CODE_MASK) -#define PKT_SIZE(_p) ((uint8_t *)&((_p).regs[PKT_COUNT(_p)]) - ((uint8_t *)&(_p))) - -static uint8_t crc_packet(IOPacket &pkt); - - class PX4IO_serial : public PX4IO_interface { public: @@ -496,7 +468,7 @@ PX4IO_serial::_wait_complete() /* start TX DMA - no callback if we also expect a reply */ /* DMA setup time ~3µs */ _dma_buffer.crc = 0; - _dma_buffer.crc = crc_packet(_dma_buffer); + _dma_buffer.crc = crc_packet(&_dma_buffer); stm32_dmasetup( _tx_dma, PX4IO_SERIAL_BASE + STM32_USART_DR_OFFSET, @@ -543,7 +515,7 @@ PX4IO_serial::_wait_complete() /* check packet CRC - corrupt packet errors mean IO receive CRC error */ uint8_t crc = _dma_buffer.crc; _dma_buffer.crc = 0; - if ((crc != crc_packet(_dma_buffer)) | (PKT_CODE(_dma_buffer) == PKT_CODE_CORRUPT)) { + if ((crc != crc_packet(&_dma_buffer)) | (PKT_CODE(_dma_buffer) == PKT_CODE_CORRUPT)) { perf_count(_pc_crcerrs); ret = -1; errno = EIO; @@ -683,52 +655,3 @@ PX4IO_serial::_abort_dma() stm32_dmastop(_tx_dma); stm32_dmastop(_rx_dma); } - -static const uint8_t crc8_tab[256] = -{ - 0x00, 0x07, 0x0E, 0x09, 0x1C, 0x1B, 0x12, 0x15, - 0x38, 0x3F, 0x36, 0x31, 0x24, 0x23, 0x2A, 0x2D, - 0x70, 0x77, 0x7E, 0x79, 0x6C, 0x6B, 0x62, 0x65, - 0x48, 0x4F, 0x46, 0x41, 0x54, 0x53, 0x5A, 0x5D, - 0xE0, 0xE7, 0xEE, 0xE9, 0xFC, 0xFB, 0xF2, 0xF5, - 0xD8, 0xDF, 0xD6, 0xD1, 0xC4, 0xC3, 0xCA, 0xCD, - 0x90, 0x97, 0x9E, 0x99, 0x8C, 0x8B, 0x82, 0x85, - 0xA8, 0xAF, 0xA6, 0xA1, 0xB4, 0xB3, 0xBA, 0xBD, - 0xC7, 0xC0, 0xC9, 0xCE, 0xDB, 0xDC, 0xD5, 0xD2, - 0xFF, 0xF8, 0xF1, 0xF6, 0xE3, 0xE4, 0xED, 0xEA, - 0xB7, 0xB0, 0xB9, 0xBE, 0xAB, 0xAC, 0xA5, 0xA2, - 0x8F, 0x88, 0x81, 0x86, 0x93, 0x94, 0x9D, 0x9A, - 0x27, 0x20, 0x29, 0x2E, 0x3B, 0x3C, 0x35, 0x32, - 0x1F, 0x18, 0x11, 0x16, 0x03, 0x04, 0x0D, 0x0A, - 0x57, 0x50, 0x59, 0x5E, 0x4B, 0x4C, 0x45, 0x42, - 0x6F, 0x68, 0x61, 0x66, 0x73, 0x74, 0x7D, 0x7A, - 0x89, 0x8E, 0x87, 0x80, 0x95, 0x92, 0x9B, 0x9C, - 0xB1, 0xB6, 0xBF, 0xB8, 0xAD, 0xAA, 0xA3, 0xA4, - 0xF9, 0xFE, 0xF7, 0xF0, 0xE5, 0xE2, 0xEB, 0xEC, - 0xC1, 0xC6, 0xCF, 0xC8, 0xDD, 0xDA, 0xD3, 0xD4, - 0x69, 0x6E, 0x67, 0x60, 0x75, 0x72, 0x7B, 0x7C, - 0x51, 0x56, 0x5F, 0x58, 0x4D, 0x4A, 0x43, 0x44, - 0x19, 0x1E, 0x17, 0x10, 0x05, 0x02, 0x0B, 0x0C, - 0x21, 0x26, 0x2F, 0x28, 0x3D, 0x3A, 0x33, 0x34, - 0x4E, 0x49, 0x40, 0x47, 0x52, 0x55, 0x5C, 0x5B, - 0x76, 0x71, 0x78, 0x7F, 0x6A, 0x6D, 0x64, 0x63, - 0x3E, 0x39, 0x30, 0x37, 0x22, 0x25, 0x2C, 0x2B, - 0x06, 0x01, 0x08, 0x0F, 0x1A, 0x1D, 0x14, 0x13, - 0xAE, 0xA9, 0xA0, 0xA7, 0xB2, 0xB5, 0xBC, 0xBB, - 0x96, 0x91, 0x98, 0x9F, 0x8A, 0x8D, 0x84, 0x83, - 0xDE, 0xD9, 0xD0, 0xD7, 0xC2, 0xC5, 0xCC, 0xCB, - 0xE6, 0xE1, 0xE8, 0xEF, 0xFA, 0xFD, 0xF4, 0xF3 -}; - -static uint8_t -crc_packet(IOPacket &pkt) -{ - uint8_t *end = (uint8_t *)(&pkt.regs[PKT_COUNT(pkt)]); - uint8_t *p = (uint8_t *)&pkt; - uint8_t c = 0; - - while (p < end) - c = crc8_tab[c ^ *(p++)]; - - return c; -} |