Diff: DAC_MCP4921.cpp

Revision:

0:46d099dfd9d6

Child:

1:e997f4e94491

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/DAC_MCP4921.cpp	Sat Mar 14 06:49:49 2015 +0000
@@ -0,0 +1,59 @@
+//------------------------------------------------------
+// Class for single DAC in MCP4921
+//
+// 2015/02/02, Copyright (c) 2015 MIKAMI, Naoki
+//------------------------------------------------------
+
+#include "DAC_MCP4921.hpp"
+
+namespace Mikami
+{
+    DAC_MCP4921::DAC_MCP4921(PinName mosi, PinName sclk,
+                             PinName cs, PinName ldac)
+        : spi_(mosi, NC, sclk),
+          ld_(ldac, 0), mySpi_((SPI_TypeDef*)NULL)
+    {
+        if ( (mosi == PA_7) || (mosi == PB_5) )  mySpi_ = SPI1;
+        if ( (mosi == PB_15) || (mosi == PC_3) ) mySpi_ = SPI2;
+        if ( mosi == PC_12 )                     mySpi_ = SPI3;
+
+        // Set SPI format
+        spi_.format(16, 0);
+        // Clock source of F401 for SPI1    : 84 MHz,
+        //                      SPI2, SPI3  : 42 MHz
+        mySpi_->CR1 = (mySpi_->CR1 & ~SPI_CR1_BR);
+        if (mySpi_ == SPI1) mySpi_->CR1 += SPI_CR1_BR_0;
+#ifdef __STM32F411xE_H
+        mySpi_->CR1 += SPI_CR1_BR_0;
+#endif  // __STM32F411xE_H
+        
+        // timer prescaler is set same value of boud rate for SPI
+        uint16_t psc = (2 << ((mySpi_->CR1 >> 3) & 0x07)) - 1;
+        if (mySpi_ != SPI1) psc = (psc + 1)*2 - 1;
+        ss_ = new Tim4_ss(psc, 19, cs);
+    }
+
+    void DAC_MCP4921::ScfClockTim3(uint32_t clock, PinName pin)
+    {
+        if ( (pin != PA_6) && (pin != PB_4) && (pin != PB_5) &&
+             (pin != PC_6) && (pin != PC_7) && (pin != PC_8) && (pin != PC_9) )
+        {
+            fprintf(stderr, "\r\nIllegal pin name in DAC_MCP4921::ScfClockTim3()\r\n");
+            while (true) {}
+        }
+
+        PwmOut clockSCF(pin);
+        
+        TIM3->ARR =  SystemCoreClock/clock - 1;
+        TIM3->PSC = 0;
+        // Set capture/compare register 2
+        if ( (pin == PA_6) || (pin == PB_4) || (pin == PC_6) )
+            TIM3->CCR1 = (TIM3->ARR + 1)/2;    
+        if ( (pin == PB_5) || (pin == PC_7) )
+            TIM3->CCR2 = (TIM3->ARR + 1)/2;    
+        if (pin == PC_8)
+            TIM3->CCR3 = (TIM3->ARR + 1)/2;    
+        if (pin == PC_9)
+            TIM3->CCR4 = (TIM3->ARR + 1)/2;    
+    }
+}