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Fixed command and address in LSB mode

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This commit is contained in:
Alex Demenchuk 2018-10-11 17:44:35 -04:00
parent f82a420b87
commit 1a348179dd
1 changed files with 20 additions and 4 deletions
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18
core/include/esp/spi.h
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@ -294,8 +294,17 @@ static inline void spi_set_command(uint8_t bus, uint8_t bits, uint16_t data)
if (!bits) return;
SPI(bus).USER0 |= SPI_USER0_COMMAND; //enable COMMAND function in SPI module
uint16_t command = data << (16 - bits); //align command data to high bits
uint16_t command;
// Commands are always sent using little endian byte order
if (!spi_get_msb(bus)) {
// "data" are natively little endian, with LSB bit order
// this makes all bits of the command ready to be sent as-is
command = data;
} else {
// MSB
command = data << (16 - bits); //align command data to high bits
command = ((command >> 8) & 0xff) | ((command << 8) & 0xff00); //swap byte order
}
SPI(bus).USER2 = SET_FIELD(SPI(bus).USER2, SPI_USER2_COMMAND_BITLEN, --bits);
SPI(bus).USER2 = SET_FIELD(SPI(bus).USER2, SPI_USER2_COMMAND_VALUE, command);
}
@ -320,7 +329,14 @@ static inline void spi_set_address(uint8_t bus, uint8_t bits, uint32_t data)
if (!bits) return;
SPI(bus).USER0 |= SPI_USER0_ADDR; //enable ADDRess function in SPI module
// addresses are always sent using big endian byte order
if (spi_get_msb(bus)) {
SPI(bus).ADDR = data << (32 - bits); //align address data to high bits
} else {
// swap bytes from native little to command's big endian order
// bits in each byte are already arranged properly for LSB
SPI(bus).ADDR = (data & 0xff) << 24 | (data & 0xff00) << 8 | ((data >> 8) & 0xff00) | ((data >> 24) & 0xff);
}
SPI(bus).USER1 = SET_FIELD(SPI(bus).USER1, SPI_USER1_ADDR_BITLEN, --bits);
}