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drivers: spi: Add support for LSB transfer for rpi_pico_pio #34

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drivers: spi: Add support for LSB transfer for rpi_pico_pio #34

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16 changes: 10 additions & 6 deletions drivers/spi/spi_rpi_pico_pio.c
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Original file line number Diff line number Diff line change
Expand Up @@ -103,6 +103,7 @@ static int spi_pico_pio_configure(const struct spi_pico_pio_config *dev_cfg,
const struct gpio_dt_spec *mosi;
const struct gpio_dt_spec *clk;
pio_sm_config sm_config;
bool lsb = false;
uint32_t offset;
uint32_t wrap_target;
uint32_t wrap;
Expand All @@ -122,10 +123,13 @@ static int spi_pico_pio_configure(const struct spi_pico_pio_config *dev_cfg,
return -ENOTSUP;
}

if (spi_cfg->operation & SPI_TRANSFER_LSB) {
LOG_ERR("Unsupported configuration");
return -ENOTSUP;
}
/* Note that SPI_TRANSFER_LSB controls the direction of shift, not the */
/* "endianness" of the data. In MSB mode, the high-order bit of the */
/* most significant byte is sent first; in LSB mode, the low-order */
/* bit of the least-significant byte is sent first. */
if (spi_cfg->operation & SPI_TRANSFER_LSB) {
lsb = true;
}

#if defined(CONFIG_SPI_EXTENDED_MODES)
if (spi_cfg->operation & (SPI_LINES_DUAL | SPI_LINES_QUAD | SPI_LINES_OCTAL)) {
Expand Down Expand Up @@ -199,9 +203,9 @@ static int spi_pico_pio_configure(const struct spi_pico_pio_config *dev_cfg,

sm_config_set_clkdiv(&sm_config, clock_div);
sm_config_set_in_pins(&sm_config, miso->pin);
sm_config_set_in_shift(&sm_config, false, true, bits);
sm_config_set_in_shift(&sm_config, lsb, true, bits);
sm_config_set_out_pins(&sm_config, mosi->pin, 1);
sm_config_set_out_shift(&sm_config, false, true, bits);
sm_config_set_out_shift(&sm_config, lsb, true, bits);
sm_config_set_sideset_pins(&sm_config, clk->pin);
sm_config_set_sideset(&sm_config, 1, false, false);
sm_config_set_wrap(&sm_config, offset + wrap_target, offset + wrap);
Expand Down
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