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Revision 148:e70627d019e9, committed 2016-09-28
- Comitter:
- StevieWray
- Date:
- Wed Sep 28 08:45:18 2016 +0000
- Parent:
- 147:30b64687e01f
- Commit message:
- Fixed DAC output on STM32F3 boards to allow 3 outputs
Changed in this revision
| targets/hal/TARGET_STM/TARGET_STM32F3/analogout_api.c | Show annotated file Show diff for this revision Revisions of this file |
--- a/targets/hal/TARGET_STM/TARGET_STM32F3/analogout_api.c Fri Sep 16 16:24:25 2016 +0100
+++ b/targets/hal/TARGET_STM/TARGET_STM32F3/analogout_api.c Wed Sep 28 08:45:18 2016 +0000
@@ -27,41 +27,49 @@
*/
#include "mbed_assert.h"
#include "analogout_api.h"
-
+
#if DEVICE_ANALOGOUT
-
+
#include "cmsis.h"
#include "pinmap.h"
#include "mbed_error.h"
#include "PeripheralPins.h"
-
+
#define DAC_RANGE (0xFFF) // 12 bits
#define DAC_NB_BITS (12)
-
-static DAC_HandleTypeDef DacHandle;
-
+
+//the STM32F334R8 has two DACs so define two different handles and a pointer to pick between them in each function
+static DAC_HandleTypeDef DacHandle1;
+static DAC_HandleTypeDef DacHandle2;
+DAC_HandleTypeDef* DacHandle;
+
// These variables are used for the "free" function
static int pa4_used = 0;
static int pa5_used = 0;
-
+
void analogout_init(dac_t *obj, PinName pin) {
+ if(pin==PA_6) //if the pin being used is PA_6 then it is DAC2 otherwise it's DAC1
+ DacHandle = &DacHandle2;
+ else
+ DacHandle = &DacHandle1;
+
DAC_ChannelConfTypeDef sConfig;
-
+
// Get the peripheral name from the pin and assign it to the object
obj->dac = (DACName)pinmap_peripheral(pin, PinMap_DAC);
MBED_ASSERT(obj->dac != (DACName)NC);
-
+
// Get the pin function and assign the used channel to the object
uint32_t function = pinmap_function(pin, PinMap_DAC);
MBED_ASSERT(function != (uint32_t)NC);
obj->channel = STM_PIN_CHANNEL(function);
-
+
// Configure GPIO
pinmap_pinout(pin, PinMap_DAC);
-
+
// Save the pin for future use
obj->pin = pin;
-
+
// Enable DAC clock
if (obj->dac == DAC_1) {
__DAC1_CLK_ENABLE();
@@ -71,43 +79,43 @@
__DAC2_CLK_ENABLE();
}
#endif
-
+
// Configure DAC
- DacHandle.Instance = (DAC_TypeDef *)(obj->dac);
-
+ DacHandle->Instance = (DAC_TypeDef *)(obj->dac);
+
sConfig.DAC_Trigger = DAC_TRIGGER_NONE;
sConfig.DAC_OutputBuffer = DAC_OUTPUTBUFFER_DISABLE;
-
+
if (pin == PA_4) {
- HAL_DAC_ConfigChannel(&DacHandle, &sConfig, DAC_CHANNEL_1);
+ HAL_DAC_ConfigChannel(DacHandle, &sConfig, DAC_CHANNEL_1);
pa4_used = 1;
}
-
+
#if defined(DAC_CHANNEL_2)
if (pin == PA_5) {
- HAL_DAC_ConfigChannel(&DacHandle, &sConfig, DAC_CHANNEL_2);
+ HAL_DAC_ConfigChannel(DacHandle, &sConfig, DAC_CHANNEL_2);
pa5_used = 1;
}
#endif
-
+
if (pin == PA_6) {
- HAL_DAC_ConfigChannel(&DacHandle, &sConfig, DAC_CHANNEL_1);
+ HAL_DAC_ConfigChannel(DacHandle, &sConfig, DAC_CHANNEL_1);
}
-
+
analogout_write_u16(obj, 0);
}
-
+
void analogout_free(dac_t *obj) {
// Reset DAC and disable clock
if (obj->pin == PA_4) pa4_used = 0;
if (obj->pin == PA_5) pa5_used = 0;
-
+
if ((pa4_used == 0) && (pa5_used == 0)) {
__DAC1_FORCE_RESET();
__DAC1_RELEASE_RESET();
__DAC1_CLK_DISABLE();
}
-
+
#if defined(DAC2)
if (obj->pin == PA_6) {
__DAC2_FORCE_RESET();
@@ -115,36 +123,48 @@
__DAC2_CLK_DISABLE();
}
#endif
-
+
// Configure GPIO
pin_function(obj->pin, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
}
-
+
static inline void dac_write(dac_t *obj, int value) {
+ //if the pin being used is PA_6 then it is DAC2 otherwise it's DAC1
+ if(obj->pin==PA_6)
+ DacHandle = &DacHandle2;
+ else
+ DacHandle = &DacHandle1;
+
if (obj->channel == 1) {
- HAL_DAC_SetValue(&DacHandle, DAC_CHANNEL_1, DAC_ALIGN_12B_R, (value & DAC_RANGE));
- HAL_DAC_Start(&DacHandle, DAC_CHANNEL_1);
+ HAL_DAC_SetValue(DacHandle, DAC_CHANNEL_1, DAC_ALIGN_12B_R, (value & DAC_RANGE));
+ HAL_DAC_Start(DacHandle, DAC_CHANNEL_1);
}
#if defined(DAC_CHANNEL_2)
if (obj->channel == 2) {
- HAL_DAC_SetValue(&DacHandle, DAC_CHANNEL_2, DAC_ALIGN_12B_R, (value & DAC_RANGE));
- HAL_DAC_Start(&DacHandle, DAC_CHANNEL_2);
+ HAL_DAC_SetValue(DacHandle, DAC_CHANNEL_2, DAC_ALIGN_12B_R, (value & DAC_RANGE));
+ HAL_DAC_Start(DacHandle, DAC_CHANNEL_2);
}
#endif
}
-
+
static inline int dac_read(dac_t *obj) {
+ //if the pin being used is PA_6 then it is DAC2 otherwise it's DAC1
+ if(obj->pin==PA_6)
+ DacHandle = &DacHandle2;
+ else
+ DacHandle = &DacHandle1;
+
if (obj->channel == 1) {
- return (int)HAL_DAC_GetValue(&DacHandle, DAC_CHANNEL_1);
+ return (int)HAL_DAC_GetValue(DacHandle, DAC_CHANNEL_1);
}
#if defined(DAC_CHANNEL_2)
if (obj->channel == 2) {
- return (int)HAL_DAC_GetValue(&DacHandle, DAC_CHANNEL_2);
+ return (int)HAL_DAC_GetValue(DacHandle, DAC_CHANNEL_2);
}
#endif
return 0;
}
-
+
void analogout_write(dac_t *obj, float value) {
if (value < 0.0f) {
dac_write(obj, 0); // Min value
@@ -154,19 +174,20 @@
dac_write(obj, (int)(value * (float)DAC_RANGE));
}
}
-
+
void analogout_write_u16(dac_t *obj, uint16_t value) {
dac_write(obj, value >> (16 - DAC_NB_BITS));
}
-
+
float analogout_read(dac_t *obj) {
uint32_t value = dac_read(obj);
return (float)value * (1.0f / (float)DAC_RANGE);
}
-
+
uint16_t analogout_read_u16(dac_t *obj) {
uint32_t value = dac_read(obj);
return (value << 4) | ((value >> 8) & 0x000F); // Conversion from 12 to 16 bits
}
-
+
#endif // DEVICE_ANALOGOUT
+
\ No newline at end of file
