[NUCLEO_F103RB] add SPI slave and I2C slave

Author: dbestm

libraries/mbed/targets/hal/TARGET_STM/TARGET_NUCLEO_F103RB/device.h

@@ -42,10 +42,10 @@
 #define DEVICE_SERIAL           1
 
 #define DEVICE_I2C              1
-#define DEVICE_I2CSLAVE         0
+#define DEVICE_I2CSLAVE         1
 
 #define DEVICE_SPI              1
-#define DEVICE_SPISLAVE         0
+#define DEVICE_SPISLAVE         1
 
 #define DEVICE_RTC              1
 

libraries/mbed/targets/hal/TARGET_STM/TARGET_NUCLEO_F103RB/i2c_api.c

@@ -118,7 +118,6 @@ inline int i2c_start(i2c_t *obj) {
 
     // Wait the START condition has been correctly sent
     timeout = FLAG_TIMEOUT;
-    //while (I2C_CheckEvent(i2c, I2C_EVENT_MASTER_MODE_SELECT) == ERROR) {
     while (I2C_GetFlagStatus(i2c, I2C_FLAG_SB) == RESET) {
         timeout--;
         if (timeout == 0) {
@@ -145,17 +144,6 @@ int i2c_read(i2c_t *obj, int address, char *data, int length, int stop) {
 
     if (length == 0) return 0;
 
-/*
-    // Wait until the bus is not busy anymore
-    timeout = LONG_TIMEOUT;
-    while (I2C_GetFlagStatus(i2c, I2C_FLAG_BUSY) == SET) {
-        timeout--;
-        if (timeout == 0) {
-            return 0;
-        }
-    }
-*/
-  
     i2c_start(obj);
 
     // Send slave address for read
@@ -194,17 +182,6 @@ int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop) {
     int timeout;
     int count;
 
-/*
-    // Wait until the bus is not busy anymore
-    timeout = LONG_TIMEOUT;
-    while (I2C_GetFlagStatus(i2c, I2C_FLAG_BUSY) == SET) {
-        timeout--;
-        if (timeout == 0) {
-            return 0;
-        }
-    }
-*/
-
     i2c_start(obj);
 
     // Send slave address for write
@@ -269,7 +246,6 @@ int i2c_byte_write(i2c_t *obj, int data) {
 
     // Wait until the byte is transmitted
     timeout = FLAG_TIMEOUT;  
-    //while (I2C_CheckEvent(i2c, I2C_EVENT_MASTER_BYTE_TRANSMITTED) == ERROR) {
     while ((I2C_GetFlagStatus(i2c, I2C_FLAG_TXE) == RESET) &&
            (I2C_GetFlagStatus(i2c, I2C_FLAG_BTF) == RESET)) {
         timeout--;
@@ -319,8 +295,46 @@ void i2c_slave_mode(i2c_t *obj, int enable_slave) {
 #define WriteAddressed 3 // the master is writing to this slave (slave = receiver)
 
 int i2c_slave_receive(i2c_t *obj) {
-    // TO BE DONE
-    return(0);
+    int retValue = NoData;
+    uint32_t event;
+    I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
+
+    event = I2C_GetLastEvent( i2c );
+    if(event != 0)
+    {
+        switch(event){
+            case I2C_EVENT_SLAVE_RECEIVER_ADDRESS_MATCHED:
+                retValue = WriteAddressed;
+                break;
+            case I2C_EVENT_SLAVE_TRANSMITTER_ADDRESS_MATCHED:
+                retValue = ReadAddressed;
+                break;
+            case I2C_EVENT_SLAVE_GENERALCALLADDRESS_MATCHED:
+                retValue = WriteGeneral;
+                break;
+            default:
+                retValue = NoData;
+                break;
+        }
+
+        // clear ADDR 
+        if((retValue == WriteAddressed) || (retValue == ReadAddressed)){
+            // read SR to clear ADDR flag
+            i2c->SR1;
+            i2c->SR2;
+        }
+        // clear stopf
+        if(I2C_GetFlagStatus(i2c, I2C_FLAG_STOPF) == SET) {
+            // read SR1 and write CR1 to clear STOP flag
+            i2c->SR1;
+            I2C_Cmd(i2c,  ENABLE);    
+        }
+        // clear AF
+        if(I2C_GetFlagStatus(i2c, I2C_FLAG_AF) == SET) {
+            I2C_ClearFlag(i2c, I2C_FLAG_AF);
+        }        
+    }
+    return(retValue);
 }
 
 int i2c_slave_read(i2c_t *obj, char *data, int length) {

libraries/mbed/targets/hal/TARGET_STM/TARGET_NUCLEO_F103RB/spi_api.c

@@ -126,7 +126,7 @@ void spi_init(spi_t *obj, PinName mosi, PinName miso, PinName sclk, PinName ssel
     else { // Slave
         pinmap_pinout(ssel, PinMap_SPI_SSEL);
         obj->mode = SPI_Mode_Slave;
-        obj->nss = SPI_NSS_Soft;
+        obj->nss = SPI_NSS_Hard;
     }
 
     init_spi(obj);