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stm32 spi driver adds the frame format #40860

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Merged
merged 2 commits into from
Jan 17, 2022
Merged

stm32 spi driver adds the frame format #40860

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99d7095
drivers: spi: stm32 spi drivers supports the frame format
FRASTM Dec 2, 2021
b6efb3f
samples: drivers led strip ws2812 overlay for stm32 nucleo
FRASTM Dec 2, 2021
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20 changes: 15 additions & 5 deletions drivers/spi/spi_ll_stm32.c
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Original file line number Diff line number Diff line change
Expand Up @@ -480,6 +480,21 @@ static int spi_stm32_configure(const struct device *dev,
return -ENOTSUP;
}

/* configure the frame format Motorola (default) or TI */
if ((config->operation & SPI_FRAME_FORMAT_TI) == SPI_FRAME_FORMAT_TI) {
#ifdef LL_SPI_PROTOCOL_TI
LL_SPI_SetStandard(spi, LL_SPI_PROTOCOL_TI);
#else
LOG_ERR("Frame Format TI not supported");
/* on stm32F1 or some stm32L1 (cat1,2) without SPI_CR2_FRF */
return -ENOTSUP;
#endif
#if defined(LL_SPI_PROTOCOL_MOTOROLA) && defined(SPI_CR2_FRF)
} else {
LL_SPI_SetStandard(spi, LL_SPI_PROTOCOL_MOTOROLA);
#endif
}

if (clock_control_get_rate(DEVICE_DT_GET(STM32_CLOCK_CONTROL_NODE),
(clock_control_subsys_t) &cfg->pclken, &clock) < 0) {
LOG_ERR("Failed call clock_control_get_rate");
Expand Down Expand Up @@ -561,11 +576,6 @@ static int spi_stm32_configure(const struct device *dev,
ll_func_set_fifo_threshold_8bit(spi);
#endif

#if !defined(CONFIG_SOC_SERIES_STM32F1X) \
&& (!defined(CONFIG_SOC_SERIES_STM32L1X) || defined(SPI_CR2_FRF))
LL_SPI_SetStandard(spi, LL_SPI_PROTOCOL_MOTOROLA);
#endif

/* At this point, it's mandatory to set this on the context! */
data->ctx.config = config;

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1 change: 1 addition & 0 deletions samples/drivers/led_ws2812/boards/nucleo_f070rb.overlay
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Expand Up @@ -19,6 +19,7 @@
/* SPI */
reg = <0>; /* ignored, but necessary for SPI bindings */
spi-max-frequency = <B1414_SPI_FREQ>;
frame-format = <32768>; /* SPI_FRAME_FORMAT_TI */

/* B1414 */
chain-length = <18>; /* arbitrary; change at will */
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33 changes: 33 additions & 0 deletions samples/drivers/led_ws2812/boards/nucleo_g071rb.overlay
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@@ -0,0 +1,33 @@
/*
* Copyright (c) 2021, STMicroelectronics
*
* SPDX-License-Identifier: Apache-2.0
*/

#include <dt-bindings/led/led.h>

&arduino_spi {
led_strip: ws2812@0 {
compatible = "worldsemi,ws2812-spi";
label = "WS2812";

/* SPI */
reg = <0>; /* ignored, but necessary for SPI bindings */
spi-max-frequency = <4000000>;
frame-format = <32768>; /* SPI_FRAME_FORMAT_TI */

/* WS2812 */
chain-length = <16>; /* arbitrary; change at will */
spi-one-frame = <0x70>;
spi-zero-frame = <0x40>;
color-mapping = <LED_COLOR_ID_GREEN
LED_COLOR_ID_RED
LED_COLOR_ID_BLUE>;
};
};

/ {
aliases {
led-strip = &led_strip;
};
};
1 change: 1 addition & 0 deletions samples/drivers/led_ws2812/boards/nucleo_l476rg.overlay
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Expand Up @@ -14,6 +14,7 @@
/* SPI */
reg = <0>; /* ignored, but necessary for SPI bindings */
spi-max-frequency = <4000000>;
frame-format = <32768>; /* SPI_FRAME_FORMAT_TI */

/* WS2812 */
chain-length = <16>; /* arbitrary; change at will */
Expand Down