Peter Drescher / mbed-F401

mbed library with additional peripherals for ST F401 board

Fork of mbed-src by mbed official

This mbed LIB has additional peripherals for ST F401 board

  • UART2 : PA_3 rx, PA_2 tx
  • UART3 : PC_7 rx, PC_6 tx
  • I2C2 : PB_3 SDA, PB_10 SCL
  • I2C3 : PB_4 SDA, PA_8 SCL

Diff: targets/hal/TARGET_STM/TARGET_NUCLEO_F103RB/spi_api.c

Revision:
88:81f18c97d490
Parent:
70:c1fbde68b492
--- a/targets/hal/TARGET_STM/TARGET_NUCLEO_F103RB/spi_api.c	Sat Feb 08 19:45:06 2014 +0000
+++ b/targets/hal/TARGET_STM/TARGET_NUCLEO_F103RB/spi_api.c	Mon Feb 10 19:00:06 2014 +0000
@@ -57,8 +57,6 @@
 // Only used in Slave mode
 static const PinMap PinMap_SPI_SSEL[] = {
     {PB_6,  SPI_1, STM_PIN_DATA(GPIO_Mode_IN_FLOATING, 0)}, // Generic IO, not real H/W NSS pin
-    //{PA_4,  SPI_1, STM_PIN_DATA(GPIO_Mode_IN_FLOATING, 0)},
-    //{PA_15, SPI_1, STM_PIN_DATA(GPIO_Mode_IN_FLOATING, 1)}, // Remap
     {NC,    NC,    0}
 };
 
@@ -102,9 +100,6 @@
     if (obj->spi == SPI_1) {
         RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE); 
     }
-    if (obj->spi == SPI_2) {
-        RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2, ENABLE); 
-    }
     
     // Configure the SPI pins
     pinmap_pinout(mosi, PinMap_SPI_MOSI);
@@ -115,7 +110,7 @@
     obj->bits = SPI_DataSize_8b;
     obj->cpol = SPI_CPOL_Low;
     obj->cpha = SPI_CPHA_1Edge;
-    obj->br_presc = SPI_BaudRatePrescaler_64; // Closest to 1MHz (72MHz/64 = 1.125MHz)
+    obj->br_presc = SPI_BaudRatePrescaler_256; // 1MHz
     
     if (ssel == NC) { // Master
         obj->mode = SPI_Mode_Master;
@@ -176,11 +171,8 @@
 }
 
 void spi_frequency(spi_t *obj, int hz) {
-    // Get SPI clock frequency
-    uint32_t PCLK = SystemCoreClock >> 1;
-
     // Choose the baud rate divisor (between 2 and 256)
-    uint32_t divisor = PCLK / hz;
+    uint32_t divisor = SystemCoreClock / hz;
 
     // Find the nearest power-of-2
     divisor = (divisor > 0 ? divisor-1 : 0);