feat: Support 3-wire spi

components/DAP/source/spi_op.c

@@ -4,17 +4,20 @@
  * @brief Using SPI for common transfer operations
  * @change: 2020-11-25 first version
  *          2021-2-11 Support SWD sequence
- * @version 0.2
- * @date 2021-2-11
+ *          2021-3-10 Support 3-wire SPI
+ * @version 0.3
+ * @date 2021-3-10
  *
  * @copyright Copyright (c) 2021
  *
  */
 #include <stdio.h>
+#include <stdbool.h>
 
 #include "esp8266/spi_struct.h"
 #include "cmsis_compiler.h"
 #include "spi_op.h"
+#include "dap_configuration.h"
 
 #define DAP_SPI SPI1
 
@@ -103,13 +106,21 @@ void DAP_SPI_ReadBits(const uint8_t count, uint8_t *buf) {
     DAP_SPI.user.usr_mosi = 0;
     DAP_SPI.user.usr_miso = 1;
 
+#if (USE_SPI_SIO == 1)
+    DAP_SPI.user.sio = true;
+#endif
+
     DAP_SPI.user1.usr_miso_bitlen = count - 1U;
 
     // Start transmission
     DAP_SPI.cmd.usr = 1;
     // Wait for reading to complete
     while (DAP_SPI.cmd.usr) continue;
 
+#if (USE_SPI_SIO == 1)
+    DAP_SPI.user.sio = false;
+#endif
+
     data_buf[0] = DAP_SPI.data_buf[0];
     data_buf[1] = DAP_SPI.data_buf[1];
 
@@ -139,6 +150,10 @@ __FORCEINLINE void DAP_SPI_Send_Header(const uint8_t packetHeaderData, uint8_t *
 
     DAP_SPI.user.usr_miso = 1;
 
+#if (USE_SPI_SIO == 1)
+    DAP_SPI.user.sio = true;
+#endif
+
     // 1 bit Trn(Before ACK) + 3bits ACK + TrnAferACK  - 1(prescribed)
     DAP_SPI.user1.usr_miso_bitlen = 1U + 3U + TrnAfterACK - 1U;
 
@@ -150,6 +165,10 @@ __FORCEINLINE void DAP_SPI_Send_Header(const uint8_t packetHeaderData, uint8_t *
     // Wait for sending to complete
     while (DAP_SPI.cmd.usr) continue;
 
+#if (USE_SPI_SIO == 1)
+    DAP_SPI.user.sio = false;
+#endif
+
     dataBuf = DAP_SPI.data_buf[0];
     *ack = (dataBuf >> 1) & 0b111;
 }
@@ -169,6 +188,10 @@ __FORCEINLINE void DAP_SPI_Read_Data(uint32_t *resData, uint8_t *resParity)
     DAP_SPI.user.usr_mosi = 0;
     DAP_SPI.user.usr_miso = 1;
 
+#if (USE_SPI_SIO == 1)
+    DAP_SPI.user.sio = true;
+#endif
+
     // 1 bit Trn(End) + 3bits ACK + 32bis data + 1bit parity - 1(prescribed)
     DAP_SPI.user1.usr_miso_bitlen = 1U + 32U + 1U - 1U;
 
@@ -177,6 +200,10 @@ __FORCEINLINE void DAP_SPI_Read_Data(uint32_t *resData, uint8_t *resParity)
     // Wait for sending to complete
     while (DAP_SPI.cmd.usr) continue;
 
+#if (USE_SPI_SIO == 1)
+    DAP_SPI.user.sio = false;
+#endif
+
     pU32Data[0] = DAP_SPI.data_buf[0];
     pU32Data[1] = DAP_SPI.data_buf[1];
 

components/DAP/source/spi_switch.c

@@ -18,6 +18,7 @@
 
 #include "cmsis_compiler.h"
 #include "spi_switch.h"
+#include "dap_configuration.h"
 
 
 #define DAP_SPI SPI1
@@ -106,11 +107,13 @@ void DAP_SPI_Init()
     pin_reg.pullup = 0;
     WRITE_PERI_REG(GPIO_PIN_REG(13), pin_reg.val);
 
+#if (USE_SPI_SIO != 1)
     PIN_FUNC_SELECT(PERIPHS_IO_MUX_MTDI_U, FUNC_HSPIQ_MISO); // GPIO12 is SPI MISO pin (Master Data In)
     // esp8266 in is always connected
     pin_reg.val = READ_PERI_REG(GPIO_PIN_REG(12));
     pin_reg.pullup = 0;
     WRITE_PERI_REG(GPIO_PIN_REG(12), pin_reg.val);
+#endif // (USE_SPI_SIO != 1)
 
 
 
@@ -136,10 +139,12 @@ __FORCEINLINE void DAP_SPI_Deinit()
 {
     PIN_FUNC_SELECT(PERIPHS_IO_MUX_MTMS_U, FUNC_GPIO14);
     PIN_FUNC_SELECT(PERIPHS_IO_MUX_MTCK_U, FUNC_GPIO13); // MOSI
+#if (USE_SPI_SIO != 1)
     PIN_FUNC_SELECT(PERIPHS_IO_MUX_MTDI_U, FUNC_GPIO12); // MISO
 
     // disable MISO output connect
     GPIO.enable_w1tc |= (0x1 << 12);
+#endif // (USE_SPI_SIO != 1)
 
     gpio_pin_reg_t pin_reg;
     GPIO.enable_w1ts |= (0x1 << 13);

main/dap_configuration.h

@@ -3,10 +3,16 @@
 
 /**
  * @brief Specify the use of WINUSB
- * 
+ *
  */
 #define USE_WINUSB 1
 
+/**
+ * @brief Enable this option, no need to physically connect MOSI and MISO
+ *
+ */
+#define USE_SPI_SIO 1
+
 /// Maximum Package Size for Command and Response data.
 /// This configuration settings is used to optimize the communication performance with the
 /// debugger and depends on the USB peripheral. Typical vales are 64 for Full-speed USB HID or WinUSB,