drivers/epd_bw_spi: adapted to the new SPI API

drivers/epd_bw_spi/epd_bw_spi.c

@@ -1,5 +1,6 @@
 /*
  * Copyright (C) 2022 Silke Hofstra
+ *               2023 Hugues Larrive
  *
  * This file is subject to the terms and conditions of the GNU Lesser
  * General Public License v2.1. See the file LICENSE in the top level
@@ -14,6 +15,7 @@
  * @brief       Device driver implementation for the epd_bw_spi display controller
  *
  * @author      Silke Hofstra <silke@slxh.eu>
+ * @author      Hugues Larrive <hugues.larrive@pm.me>
  * @}
  */
 #include <string.h>
@@ -105,6 +107,9 @@ int epd_bw_spi_init(epd_bw_spi_t *dev, const epd_bw_spi_params_t *params)
         return res;
     }
 
+    /* compute the SPI clk configuration */
+    dev->params.spi_clk = spi_get_clk(dev->params.spi, dev->params.spi_freq);
+
     return 0;
 }
 

drivers/epd_bw_spi/include/epd_bw_spi_params.h

@@ -1,5 +1,6 @@
 /*
  * Copyright (C) 2019 Silke Hofstra
+ *               2023 Hugues Larrive
  *
  * This file is subject to the terms and conditions of the GNU Lesser
  * General Public License v2.1. See the file LICENSE in the top level
@@ -14,13 +15,15 @@
  * @brief       Default configuration for epd_bw_spi
  *
  * @author      Silke Hofstra <silke@slxh.eu>
+ * @author      Hugues Larrive <hugues.larrive@pm.me>
  */
 
 #ifndef EPD_BW_SPI_PARAMS_H
 #define EPD_BW_SPI_PARAMS_H
 
 #include "board.h"
 #include "epd_bw_spi.h"
+#include "macros/units.h"
 
 #ifdef __cplusplus
 extern "C" {
@@ -109,7 +112,7 @@ static const uint8_t epd_bw_spi_il3829_lut_default_part[] = {
 /**
  * @brief SPI device clock speed.
  */
-#define EPD_BW_SPI_PARAM_SPI_CLK    (SPI_CLK_5MHZ)
+#define EPD_BW_SPI_PARAM_SPI_CLK    MHZ(4) /* 1 / 250ns min clock cycle time */
 #endif
 
 /**
@@ -175,7 +178,7 @@ static const uint8_t epd_bw_spi_il3829_lut_default_part[] = {
  * @brief Parameters to initialize the display with.
  */
 #define EPD_BW_SPI_PARAMS           { .spi = EPD_BW_SPI_PARAM_SPI, \
-                                      .spi_clk = EPD_BW_SPI_PARAM_SPI_CLK, \
+                                      .spi_freq = EPD_BW_SPI_PARAM_SPI_CLK, \
                                       .cs_pin = EPD_BW_SPI_PARAM_CS, \
                                       .dc_pin = EPD_BW_SPI_PARAM_DC, \
                                       .rst_pin = EPD_BW_SPI_PARAM_RST, \

drivers/include/epd_bw_spi.h

@@ -1,5 +1,6 @@
 /*
  * Copyright (C) 2019 Silke Hofstra
+ *               2023 Hugues Larrive
  *
  * This file is subject to the terms and conditions of the GNU Lesser
  * General Public License v2.1. See the file LICENSE in the top level
@@ -27,6 +28,7 @@
  * @brief       Generic black/white e-paper/e-ink display SPI driver.
  *
  * @author      Silke Hofstra <silke@slxh.eu>
+ * @author      Hugues Larrive <hugues.larrive@pm.me>
  */
 
 #ifndef EPD_BW_SPI_H
@@ -84,7 +86,8 @@ typedef struct {
  */
 typedef struct {
     spi_t spi;                              /**< SPI device that the display is connected to */
-    spi_clk_t spi_clk;                      /**< SPI clock speed to use */
+    spi_clk_t spi_clk;                      /**< SPI clock configuration computed during init */
+    uint32_t spi_freq;                      /**< SPI clock speed to use */
     gpio_t cs_pin;                          /**< pin connected to the CHIP SELECT line */
     gpio_t dc_pin;                          /**< pin connected to the DC line */
     gpio_t rst_pin;                         /**< pin connected to the reset line (optional) */