diff options
Diffstat (limited to 'libmaple/dac.c')
| -rw-r--r-- | libmaple/dac.c | 38 |
1 files changed, 17 insertions, 21 deletions
diff --git a/libmaple/dac.c b/libmaple/dac.c index ffc34f8..4c00edb 100644 --- a/libmaple/dac.c +++ b/libmaple/dac.c @@ -1,5 +1,4 @@ - -/* ***************************************************************************** +/****************************************************************************** * The MIT License * * Copyright (c) 2010 Bryan Newbold. @@ -21,47 +20,44 @@ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. - * ****************************************************************************/ + *****************************************************************************/ #include "libmaple.h" #include "rcc.h" #include "gpio.h" #include "dac.h" -// Only one, so global to this file +/* Only one, so global to this file */ DAC_Map *dac = (DAC_Map*)(DAC_BASE); -// This numbering follows the registers (1-indexed) +/* This numbering follows the registers (1-indexed) */ #define DAC_CHA 1 #define DAC_CHB 2 -// Sets up the DAC peripheral +/* Sets up the DAC peripheral */ void dac_init(void) { - - // First turn on the clock + /* First turn on the clock */ rcc_clk_enable(RCC_DAC); - // Then setup ANALOG mode on PA4 and PA5 + /* Then setup ANALOG mode on PA4 and PA5 */ gpio_set_mode(GPIOA_BASE, 4, CNF_INPUT_ANALOG); gpio_set_mode(GPIOA_BASE, 5, CNF_INPUT_ANALOG); - // Then do register stuff. - // Default does no triggering, and buffered output, so all good. + /* Then do register stuff. Default does no triggering, and + * buffered output, so all good. */ dac->CR |= DAC_CR_EN1; dac->CR |= DAC_CR_EN2; - } void dac_write(uint8 chan, uint16 val) { - switch(chan) { - case DAC_CHA: - dac->DHR12R1 = 0x0FFF & val; - break; - case DAC_CHB: - dac->DHR12R2 = 0x0FFF & val; - break; - default: - ASSERT(0); // Shouldn't get here + case DAC_CHA: + dac->DHR12R1 = 0x0FFF & val; + break; + case DAC_CHB: + dac->DHR12R2 = 0x0FFF & val; + break; + default: + ASSERT(0); // can't happen } } |