From 3957853296e8b15f3ea0ce575b0ccb8141b883fc Mon Sep 17 00:00:00 2001
From: Shuanglei Tao <tsl0922@gmail.com>
Date: Fri, 17 Jan 2025 10:28:18 +0800
Subject: [PATCH] optimize SPI data transfer

---
 EPD/DEV_Config.c   |  5 +++++
 EPD/DEV_Config.h   |  1 +
 EPD/EPD_4in2.c     |  8 ++++++++
 EPD/EPD_4in2.h     |  1 +
 EPD/EPD_4in2_V2.c  |  7 +++++++
 EPD/EPD_4in2_V2.h  |  1 +
 EPD/EPD_4in2b_V2.c |  8 ++++++++
 EPD/EPD_4in2b_V2.h |  1 +
 EPD/EPD_ble.c      | 11 ++++-------
 EPD/EPD_ble.h      |  2 +-
 10 files changed, 37 insertions(+), 8 deletions(-)

diff --git a/EPD/DEV_Config.c b/EPD/DEV_Config.c
index cb535f7..81be0ef 100644
--- a/EPD/DEV_Config.c
+++ b/EPD/DEV_Config.c
@@ -72,6 +72,11 @@ void DEV_SPI_WriteByte(UBYTE value)
     nrf_drv_spi_transfer(&spi, &value, 1, NULL, 0);
 }
 
+void DEV_SPI_WriteBytes(UBYTE *value, UBYTE len)
+{
+    nrf_drv_spi_transfer(&spi, value, len, NULL, 0);
+}
+
 UBYTE DEV_SPI_ReadByte(void)
 {
     UBYTE value;
diff --git a/EPD/DEV_Config.h b/EPD/DEV_Config.h
index 5c01b8f..1c0ed50 100644
--- a/EPD/DEV_Config.h
+++ b/EPD/DEV_Config.h
@@ -51,6 +51,7 @@ UBYTE DEV_Module_Init(void);
 void DEV_Module_Exit(void);
 
 void DEV_SPI_WriteByte(UBYTE value);
+void DEV_SPI_WriteBytes(UBYTE *value, UBYTE len);
 UBYTE DEV_SPI_ReadByte(void);
 
 #endif
diff --git a/EPD/EPD_4in2.c b/EPD/EPD_4in2.c
index 7b027cb..d470421 100644
--- a/EPD/EPD_4in2.c
+++ b/EPD/EPD_4in2.c
@@ -73,6 +73,14 @@ void EPD_4IN2_SendData(UBYTE Data)
     DEV_Digital_Write(EPD_CS_PIN, 1);
 }
 
+void EPD_4IN2_SendData2(UBYTE *Data, UBYTE Len)
+{
+    DEV_Digital_Write(EPD_DC_PIN, 1);
+    DEV_Digital_Write(EPD_CS_PIN, 0);
+    DEV_SPI_WriteBytes(Data, Len);
+    DEV_Digital_Write(EPD_CS_PIN, 1);
+}
+
 /******************************************************************************
 function :	Wait until the busy_pin goes LOW
 parameter:
diff --git a/EPD/EPD_4in2.h b/EPD/EPD_4in2.h
index da5fb29..95c0ffb 100644
--- a/EPD/EPD_4in2.h
+++ b/EPD/EPD_4in2.h
@@ -44,6 +44,7 @@ void EPD_4IN2_Sleep(void);
 
 void EPD_4IN2_SendCommand(UBYTE Reg);
 void EPD_4IN2_SendData(UBYTE Data);
+void EPD_4IN2_SendData2(UBYTE *Data, UBYTE Len);
 void EPD_4IN2_TurnOnDisplay(void);
 
 #endif
diff --git a/EPD/EPD_4in2_V2.c b/EPD/EPD_4in2_V2.c
index 249b965..3ec1138 100644
--- a/EPD/EPD_4in2_V2.c
+++ b/EPD/EPD_4in2_V2.c
@@ -70,6 +70,13 @@ void EPD_4IN2_V2_SendData(UBYTE Data)
     DEV_Digital_Write(EPD_CS_PIN, 1);
 }
 
+void EPD_4IN2_V2_SendData2(UBYTE *Data, UBYTE Len)
+{
+    DEV_Digital_Write(EPD_DC_PIN, 1);
+    DEV_Digital_Write(EPD_CS_PIN, 0);
+    DEV_SPI_WriteBytes(Data, Len);
+    DEV_Digital_Write(EPD_CS_PIN, 1);
+}
 /******************************************************************************
 function :	Wait until the busy_pin goes LOW
 parameter:
diff --git a/EPD/EPD_4in2_V2.h b/EPD/EPD_4in2_V2.h
index b47fdce..2a1cbe7 100644
--- a/EPD/EPD_4in2_V2.h
+++ b/EPD/EPD_4in2_V2.h
@@ -47,6 +47,7 @@ void EPD_4IN2_V2_Sleep(void);
 
 void EPD_4IN2_V2_SendCommand(UBYTE Reg);
 void EPD_4IN2_V2_SendData(UBYTE Data);
+void EPD_4IN2_V2_SendData2(UBYTE *Data, UBYTE Len);
 void EPD_4IN2_V2_TurnOnDisplay(void);
 
 #endif
diff --git a/EPD/EPD_4in2b_V2.c b/EPD/EPD_4in2b_V2.c
index fdbb54f..d6b089e 100644
--- a/EPD/EPD_4in2b_V2.c
+++ b/EPD/EPD_4in2b_V2.c
@@ -69,6 +69,14 @@ void EPD_4IN2B_V2_SendData(UBYTE Data)
     DEV_Digital_Write(EPD_CS_PIN, 1);
 }
 
+void EPD_4IN2B_V2_SendData2(UBYTE *Data, UBYTE Len)
+{
+    DEV_Digital_Write(EPD_DC_PIN, 1);
+    DEV_Digital_Write(EPD_CS_PIN, 0);
+    DEV_SPI_WriteBytes(Data, Len);
+    DEV_Digital_Write(EPD_CS_PIN, 1);
+}
+
 /******************************************************************************
 function :	Wait until the busy_pin goes LOW
 parameter:
diff --git a/EPD/EPD_4in2b_V2.h b/EPD/EPD_4in2b_V2.h
index bfbdfdf..7d82ae3 100644
--- a/EPD/EPD_4in2b_V2.h
+++ b/EPD/EPD_4in2b_V2.h
@@ -43,6 +43,7 @@ void EPD_4IN2B_V2_Sleep(void);
 
 void EPD_4IN2B_V2_SendCommand(UBYTE Reg);
 void EPD_4IN2B_V2_SendData(UBYTE Data);
+void EPD_4IN2B_V2_SendData2(UBYTE *Data, UBYTE Len);
 void EPD_4IN2B_V2_TurnOnDisplay(void);
 
 #endif
diff --git a/EPD/EPD_ble.c b/EPD/EPD_ble.c
index 3dcbaa7..85e0f33 100644
--- a/EPD/EPD_ble.c
+++ b/EPD/EPD_ble.c
@@ -41,13 +41,13 @@
 /** EPD drivers */
 static epd_driver_t epd_drivers[] = {
     {EPD_DRIVER_4IN2, EPD_4IN2_Init, EPD_4IN2_Clear, 
-     EPD_4IN2_SendCommand, EPD_4IN2_SendData,
+     EPD_4IN2_SendCommand, EPD_4IN2_SendData2,
      EPD_4IN2_TurnOnDisplay, EPD_4IN2_Sleep},
     {EPD_DRIVER_4IN2_V2, EPD_4IN2_V2_Init, EPD_4IN2_V2_Clear,
-     EPD_4IN2_V2_SendCommand, EPD_4IN2_V2_SendData,
+     EPD_4IN2_V2_SendCommand, EPD_4IN2_V2_SendData2,
      EPD_4IN2_V2_TurnOnDisplay, EPD_4IN2_V2_Sleep},
     {EPD_DRIVER_4IN2B_V2, EPD_4IN2B_V2_Init, EPD_4IN2B_V2_Clear,
-     EPD_4IN2B_V2_SendCommand, EPD_4IN2B_V2_SendData,
+     EPD_4IN2B_V2_SendCommand, EPD_4IN2B_V2_SendData2,
      EPD_4IN2B_V2_TurnOnDisplay, EPD_4IN2B_V2_Sleep},
 };
 
@@ -178,10 +178,7 @@ static void epd_service_process(ble_epd_t * p_epd, uint8_t * p_data, uint16_t le
           break;
 
       case EPD_CMD_SEND_DATA:
-          for (UWORD i = 0; i < length - 1; i++)
-          {
-              p_epd->driver->send_data(p_data[i + 1]);
-          }
+          p_epd->driver->send_data(&p_data[1], length - 1);
           break;
 
       case EPD_CMD_DISPLAY:
diff --git a/EPD/EPD_ble.h b/EPD/EPD_ble.h
index 6e0ce90..030ede6 100644
--- a/EPD/EPD_ble.h
+++ b/EPD/EPD_ble.h
@@ -76,7 +76,7 @@ typedef struct
     void (*init)(void);                               /**< Initialize the e-Paper register */
     void (*clear)(void);                              /**< Clear screen */
     void (*send_command)(UBYTE Reg);                  /**< send command */
-    void (*send_data)(UBYTE Data);                    /**< send data */
+    void (*send_data)(UBYTE *Data, UBYTE Len);        /**< send data */
     void (*display)(void);                            /**< Sends the image buffer in RAM to e-Paper and displays */
     void (*sleep)(void);                              /**< Enter sleep mode */
 } epd_driver_t;