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| author | Radomir Dopieralski <openstack@sheep.art.pl> | 2016-08-25 10:42:33 +0200 |
|---|---|---|
| committer | Paul Sokolovsky <pfalcon@users.sourceforge.net> | 2016-08-25 21:24:22 +0300 |
| commit | 891479e62a8db32d5a6351e9e3eb9e5dd570ba9c (patch) | |
| tree | 5da7247e3700908286acf651d44afefb900b91c7 | |
| parent | 9897bcaa731d9dfe62cac61b56698799c8e6bac8 (diff) | |
| download | micropython-891479e62a8db32d5a6351e9e3eb9e5dd570ba9c.tar.gz micropython-891479e62a8db32d5a6351e9e3eb9e5dd570ba9c.zip | |
esp8266/hspi: Enable duplex operation of hardware SPI
Without this, spi.read(1, 0xff) would use 16 clock cycles,
first to send 0xff and then to receive one byte, as visible
with a logic analyzer.
| -rw-r--r-- | esp8266/hspi.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/esp8266/hspi.c b/esp8266/hspi.c index 7315dc8a12..436fb4f6f4 100644 --- a/esp8266/hspi.c +++ b/esp8266/hspi.c @@ -199,7 +199,11 @@ uint32_t spi_transaction(uint8_t spi_no, uint8_t cmd_bits, uint16_t cmd_data, // This is rather inefficient but allows for a very generic function. // CMD ADDR and MOSI are set below to save on an extra if statement. if (din_bits) { - SET_PERI_REG_MASK(SPI_USER(spi_no), SPI_USR_MISO); + if (dout_bits) { + SET_PERI_REG_MASK(SPI_USER(spi_no), SPI_DOUTDIN); + } else { + SET_PERI_REG_MASK(SPI_USER(spi_no), SPI_USR_MISO); + } } if (dummy_bits) { SET_PERI_REG_MASK(SPI_USER(spi_no), SPI_USR_DUMMY); |