diff options
| -rw-r--r-- | fw/main.c | 11 |
1 files changed, 8 insertions, 3 deletions
@@ -176,11 +176,11 @@ static int active_segment = 0; /* This value is a constant offset added to every bit period to allow for the timer IRQ handler to execute. This is set * empirically using a debugger and a logic analyzer. */ -#define TIMER_CYCLES_FOR_SPI_TRANSMISSIONS 13 +#define TIMER_CYCLES_FOR_SPI_TRANSMISSIONS 9 -#define TIMER_CYCLES_BEFORE_LED_STROBE 12 +#define TIMER_CYCLES_BEFORE_LED_STROBE 8 -#define AUX_SPI_PRETRIGGER 20 +#define AUX_SPI_PRETRIGGER 64 /* Defines for brevity */ #define A TIMER_CYCLES_FOR_SPI_TRANSMISSIONS @@ -252,8 +252,11 @@ void cfg_timer3() { } void TIM1_CC_IRQHandler() { + /* This handler takes about 1.5us */ GPIOA->BSRR = GPIO_BSRR_BS_0; // Debug + SPI1->CR1 |= (2<<SPI_CR1_BR_Pos); /* Set baudrate to 12.5MBd for slow-ish 74HC(T)595*/ + active_bit = 0; active_segment++; if (active_segment == NSEGMENTS) { @@ -280,9 +283,11 @@ void TIM1_CC_IRQHandler() { } void TIM3_IRQHandler() { + /* This handler takes about 2.3us */ GPIOA->BSRR = GPIO_BSRR_BS_4; // Debug //TIM3->CR1 &= ~TIM_CR1_CEN_Msk; FIXME + SPI1->CR1 &= ~SPI_CR1_BR_Msk; /* Reset baudrate to 25MBd for fast MBI5026*/ GPIOA->BSRR = GPIO_BSRR_BS_10; /* Note: On boot, multiplexing will start with bit 1 due to the next few lines. This is perfectly ok. */ |