diff options
| author | Martin Hierholzer <mhier@tartaros> | 2021-09-25 11:52:31 +0200 |
|---|---|---|
| committer | Kevin O'Connor <kevin@koconnor.net> | 2022-04-22 13:25:03 -0400 |
| commit | 77937846402f011c4c49a97027606902acea7a12 (patch) | |
| tree | be74983796c6a9a8a3be0cb95301e64e9f900f7d /src | |
| parent | a02da851011b9eea2ca3083cf286341c550fb208 (diff) | |
| download | kutter-77937846402f011c4c49a97027606902acea7a12.tar.gz kutter-77937846402f011c4c49a97027606902acea7a12.tar.xz kutter-77937846402f011c4c49a97027606902acea7a12.zip | |
spicmds: Allow inversion of CS pin for SPI busses
Signed-off-by: Martin Hierholzer <martin@hierholzer.info>
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
Diffstat (limited to 'src')
| -rw-r--r-- | src/spicmds.c | 26 |
1 files changed, 14 insertions, 12 deletions
diff --git a/src/spicmds.c b/src/spicmds.c index 8bdefbbf..2c3f3ed6 100644 --- a/src/spicmds.c +++ b/src/spicmds.c @@ -23,17 +23,18 @@ struct spidev_s { }; enum { - SF_HAVE_PIN = 1, SF_SOFTWARE = 2, SF_HARDWARE = 4, + SF_HAVE_PIN = 1, SF_SOFTWARE = 2, SF_HARDWARE = 4, SF_CS_ACTIVE_HIGH = 8 }; void command_config_spi(uint32_t *args) { struct spidev_s *spi = oid_alloc(args[0], command_config_spi, sizeof(*spi)); - spi->pin = gpio_out_setup(args[1], 1); - spi->flags |= SF_HAVE_PIN; + uint_fast8_t cs_active_high = args[2]; + spi->pin = gpio_out_setup(args[1], !cs_active_high); + spi->flags |= SF_HAVE_PIN | (cs_active_high ? SF_CS_ACTIVE_HIGH : 0); } -DECL_COMMAND(command_config_spi, "config_spi oid=%c pin=%u"); +DECL_COMMAND(command_config_spi, "config_spi oid=%c pin=%u cs_active_high=%c"); void command_config_spi_without_cs(uint32_t *args) @@ -86,25 +87,26 @@ void spidev_transfer(struct spidev_s *spi, uint8_t receive_data , uint8_t data_len, uint8_t *data) { - if (!(spi->flags & (SF_SOFTWARE|SF_HARDWARE))) + uint_fast8_t flags = spi->flags; + if (!(flags & (SF_SOFTWARE|SF_HARDWARE))) // Not yet initialized return; - if (CONFIG_HAVE_GPIO_BITBANGING && spi->flags & SF_SOFTWARE) + if (CONFIG_HAVE_GPIO_BITBANGING && flags & SF_SOFTWARE) spi_software_prepare(spi->spi_software); else spi_prepare(spi->spi_config); - if (spi->flags & SF_HAVE_PIN) - gpio_out_write(spi->pin, 0); + if (flags & SF_HAVE_PIN) + gpio_out_write(spi->pin, !!(flags & SF_CS_ACTIVE_HIGH)); - if (CONFIG_HAVE_GPIO_BITBANGING && spi->flags & SF_SOFTWARE) + if (CONFIG_HAVE_GPIO_BITBANGING && flags & SF_SOFTWARE) spi_software_transfer(spi->spi_software, receive_data, data_len, data); else spi_transfer(spi->spi_config, receive_data, data_len, data); - if (spi->flags & SF_HAVE_PIN) - gpio_out_write(spi->pin, 1); + if (flags & SF_HAVE_PIN) + gpio_out_write(spi->pin, !(flags & SF_CS_ACTIVE_HIGH)); } void @@ -163,7 +165,7 @@ spidev_shutdown(void) struct spidev_s *spi; foreach_oid(oid, spi, command_config_spi) { if (spi->flags & SF_HAVE_PIN) - gpio_out_write(spi->pin, 1); + gpio_out_write(spi->pin, !(spi->flags & SF_CS_ACTIVE_HIGH)); } // Send shutdown messages |