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-rw-r--r--olsndot/firmware/Makefile9
-rw-r--r--olsndot/firmware/main.c250
2 files changed, 122 insertions, 137 deletions
diff --git a/olsndot/firmware/Makefile b/olsndot/firmware/Makefile
index cf338eb..625865d 100644
--- a/olsndot/firmware/Makefile
+++ b/olsndot/firmware/Makefile
@@ -10,13 +10,13 @@ SIZE := arm-none-eabi-size
CFLAGS = -Wall -g -std=gnu11 -Os
CFLAGS += -mlittle-endian -mcpu=cortex-m0 -march=armv6-m -mthumb
-CFLAGS += -ffunction-sections -fdata-sections
-CFLAGS += -Wl,--gc-sections -Wl,-Map=main.map
+CFLAGS += -ffunction-sections -fdata-sections -Wl,--gc-sections
+CFLAGS += -Wl,-Map=main.map
# Technically we're using an STM32F030F4, but apart from the TSSOP20 package that one is largely identical to the
# STM32F030*6 and there is no separate device header provided for it, so we're faking a *6 device here. This is
# even documented in stm32f0xx.h. Thanks ST!
-CFLAGS += -DSTM32F030x6
+CFLAGS += -DSTM32F030x6 -DHSE_VALUE=16000000
CFLAGS += -Tstm32_flash.ld
CFLAGS += -I$(CMSIS_DEV_PATH)/Include -I$(CMSIS_PATH)/Include -I$(HAL_PATH)/Inc -Iconfig
@@ -28,6 +28,9 @@ CFLAGS += -L$(CMSIS_PATH)/Lib/GCC -larm_cortexM0l_math
all: main.elf
+cmsis_exports.c: $(CMSIS_DEV_PATH)/Include/stm32f030x6.h $(CMSIS_PATH)/Include/core_cm0.h
+ python3 gen_cmsis_exports.py $^ > $@
+
main.elf: main.c startup_stm32f030x6.s system_stm32f0xx.c $(HAL_PATH)/Src/stm32f0xx_ll_utils.c
$(CC) $(CFLAGS) -o $@ $^
$(OBJCOPY) -O ihex $@ $(@:.elf=.hex)
diff --git a/olsndot/firmware/main.c b/olsndot/firmware/main.c
index e4b3935..1b3e054 100644
--- a/olsndot/firmware/main.c
+++ b/olsndot/firmware/main.c
@@ -3,26 +3,72 @@
#include <stdint.h>
#include <system_stm32f0xx.h>
#include <stm32f0xx_ll_utils.h>
+#include <math.h>
/*
* Part number: STM32F030F4C6
*/
#define NBITS 12
void do_transpose(void);
-uint32_t brightness[8];
-volatile uint8_t brightness_by_bit[NBITS];
+uint32_t brightness[32];
+volatile uint32_t brightness_by_bit[NBITS];
+
+void hsv_set(int idx, int hue, int white) {
+ int i = hue>>NBITS;
+ int j = hue & (~(-1<<NBITS));
+ int r=0, g=0, b=0;
+ switch (i) {
+ case 0:
+ r = (1<<NBITS)-1;
+ g = 0;
+ b = j;
+ break;
+ case 1:
+ r = (1<<NBITS)-1-j;
+ g = 0;
+ b = (1<<NBITS)-1;
+ break;
+ case 2:
+ r = 0;
+ g = j;
+ b = (1<<NBITS)-1;
+ break;
+ case 3:
+ r = 0;
+ g = (1<<NBITS)-1;
+ b = (1<<NBITS)-1-j;
+ break;
+ case 4:
+ r = j;
+ g = (1<<NBITS)-1;
+ b = 0;
+ break;
+ case 5:
+ r = (1<<NBITS)-1;
+ g = (1<<NBITS)-1-j;
+ b = 0;
+ break;
+ }
+ brightness[idx*4 + 0] = white;
+ brightness[idx*4 + 1] = r;
+ brightness[idx*4 + 2] = g;
+ brightness[idx*4 + 3] = b;
+}
+int hue;
int main(void) {
RCC->CR |= RCC_CR_HSEON;
while (!(RCC->CR&RCC_CR_HSERDY));
- RCC->CFGR &= ~RCC_CFGR_PLLMUL_Msk & ~RCC_CFGR_SW_Msk;
- RCC->CFGR |= (2<<RCC_CFGR_PLLMUL_Pos) | RCC_CFGR_PLLSRC; /* PLL x4 */
+ RCC->CFGR &= ~RCC_CFGR_PLLMUL_Msk & ~RCC_CFGR_SW_Msk & ~RCC_CFGR_PPRE_Msk & ~RCC_CFGR_HPRE_Msk;
+ RCC->CFGR |= (2<<RCC_CFGR_PLLMUL_Pos) | RCC_CFGR_PLLSRC_HSE_PREDIV; /* PLL x4 -> 50.0MHz */
+ RCC->CFGR2 &= ~RCC_CFGR2_PREDIV_Msk;
+ RCC->CFGR2 |= RCC_CFGR2_PREDIV_DIV2; /* prediv :2 -> 12.5MHz */
RCC->CR |= RCC_CR_PLLON;
while (!(RCC->CR&RCC_CR_PLLRDY));
RCC->CFGR |= (2<<RCC_CFGR_SW_Pos);
SystemCoreClockUpdate();
- LL_Init1msTick(SystemCoreClock);
+
RCC->AHBENR |= RCC_AHBENR_GPIOAEN | RCC_AHBENR_GPIOBEN;
RCC->APB2ENR |= RCC_APB2ENR_SPI1EN | RCC_APB2ENR_TIM1EN | RCC_APB2ENR_USART1EN | RCC_APB2ENR_ADCEN;
@@ -32,26 +78,26 @@ int main(void) {
| (1<<GPIO_MODER_MODER1_Pos) /* PA1 - RS485 TX enable */
| (2<<GPIO_MODER_MODER2_Pos) /* PA2 - RS485 TX */
| (2<<GPIO_MODER_MODER3_Pos) /* PA3 - RS485 RX */
- | (1<<GPIO_MODER_MODER4_Pos) /* PA4 - LED1 open-drain output */
+ /* PA4 reserved because */
| (2<<GPIO_MODER_MODER5_Pos) /* PA5 - Shift register clk/SCLK */
| (1<<GPIO_MODER_MODER6_Pos) /* PA6 - LED2 open-drain output */
| (2<<GPIO_MODER_MODER7_Pos) /* PA7 - Shift register data/MOSI */
- | (2<<GPIO_MODER_MODER9_Pos) /* PA9 - Shift register clear (TIM1_CH2) */
+ | (2<<GPIO_MODER_MODER9_Pos) /* FIXME PA9 - Shift register clear (TIM1_CH2) */
| (2<<GPIO_MODER_MODER10_Pos);/* PA10 - Shift register strobe (TIM1_CH3) */
GPIOB->MODER |=
- (1<<GPIO_MODER_MODER1_Pos); /* PB1 - Current measurement range selection */
+ (2<<GPIO_MODER_MODER1_Pos); /* PB1 - Shift register clear (TIM1_CH3N) */
- GPIOA->OTYPER |= GPIO_OTYPER_OT_6 | GPIO_OTYPER_OT_4; /* LED outputs -> open drain */
+ GPIOA->OTYPER |= GPIO_OTYPER_OT_6; /* LED outputs -> open drain */
/* Set shift register IO GPIO output speed */
GPIOA->OSPEEDR |=
- (3<<GPIO_OSPEEDR_OSPEEDR4_Pos) /* LED1 */
- | (3<<GPIO_OSPEEDR_OSPEEDR5_Pos) /* SCLK */
- | (3<<GPIO_OSPEEDR_OSPEEDR6_Pos) /* LED2 */
+ (3<<GPIO_OSPEEDR_OSPEEDR5_Pos) /* SCLK */
+ | (3<<GPIO_OSPEEDR_OSPEEDR6_Pos) /* LED1 */
| (3<<GPIO_OSPEEDR_OSPEEDR7_Pos) /* MOSI */
- | (3<<GPIO_OSPEEDR_OSPEEDR9_Pos) /* Clear */
| (3<<GPIO_OSPEEDR_OSPEEDR10_Pos);/* Strobe */
+ GPIOB->OSPEEDR |=
+ (3<<GPIO_OSPEEDR_OSPEEDR1_Pos); /* Clear */
GPIOA->AFR[0] |=
(1<<GPIO_AFRL_AFRL2_Pos) /* USART1_TX */
@@ -59,38 +105,27 @@ int main(void) {
| (0<<GPIO_AFRL_AFRL5_Pos) /* SPI1_SCK */
| (0<<GPIO_AFRL_AFRL7_Pos); /* SPI1_MOSI */
GPIOA->AFR[1] |=
- (2<<GPIO_AFRH_AFRH1_Pos) /* TIM1_CH2 */
- | (2<<GPIO_AFRH_AFRH2_Pos); /* TIM1_CH3 */
+ (2<<GPIO_AFRH_AFRH2_Pos); /* TIM1_CH3 */
+ GPIOB->AFR[0] |=
+ (2<<GPIO_AFRL_AFRL1_Pos); /* TIM1_CH3N */
- GPIOB->BSRR = GPIO_BSRR_BR_1; /* clear output is active low */
-
/* Configure SPI controller */
/* CPOL=0, CPHA=0, prescaler=8 -> 1MBd */
-// SPI1->CR1 = SPI_CR1_BIDIMODE | SPI_CR1_BIDIOE | SPI_CR1_SSM | SPI_CR1_SSI | SPI_CR1_SPE | (2<<SPI_CR1_BR_Pos) | SPI_CR1_MSTR;
SPI1->CR1 = SPI_CR1_BIDIMODE | SPI_CR1_BIDIOE | SPI_CR1_SSM | SPI_CR1_SSI | SPI_CR1_SPE | (0<<SPI_CR1_BR_Pos) | SPI_CR1_MSTR;
- SPI1->CR2 = (7<<SPI_CR2_DS_Pos);
+ SPI1->CR2 = (0xf<<SPI_CR2_DS_Pos);
/* Configure TIM1 for display strobe generation */
/* Configure UART for RS485 comm */
/* 8N1, 115200Bd */
-// TIM1->CR1 = TIM_CR1_OPM | TIM_CR1_URS;
-// TIM1->CR1 = TIM_CR1_ARPE | TIM_CR1_URS;
- TIM1->CR1 = TIM_CR1_ARPE | TIM_CR1_OPM; // | TIM_CR1_URS;
- TIM1->CR2 = 0; //TIM_CR2_CCPC;
- TIM1->SMCR = 0;
- TIM1->DIER = 0;
+ TIM1->CR1 = TIM_CR1_ARPE; // | TIM_CR1_OPM; // | TIM_CR1_URS;
TIM1->PSC = 1; // debug
/* CH2 - clear/!MR, CH3 - strobe/STCP */
- TIM1->CCR2 = 1;
- TIM1->RCR = 0;
- TIM1->CCMR1 = (6<<TIM_CCMR1_OC2M_Pos); // | TIM_CCMR1_OC2PE;
TIM1->CCMR2 = (6<<TIM_CCMR2_OC3M_Pos); // | TIM_CCMR2_OC3PE;
- TIM1->CCER |= TIM_CCER_CC2E | TIM_CCER_CC2NE | TIM_CCER_CC2P | TIM_CCER_CC3E;
-// TIM1->CCMR1 = (6<<TIM_CCMR1_OC2M_Pos) | TIM_CCMR1_OC2PE;
-// TIM1->CCMR2 = (6<<TIM_CCMR2_OC3M_Pos) | TIM_CCMR2_OC3PE;
-// TIM1->CCER = TIM_CCER_CC2E | TIM_CCER_CC3E;
-// TIM1->BDTR = TIM_BDTR_MOE;
+ TIM1->CCER |= TIM_CCER_CC3E | TIM_CCER_CC3NE | TIM_CCER_CC3P | TIM_CCER_CC3NP;
+ TIM1->BDTR = TIM_BDTR_MOE | (8<<TIM_BDTR_DTG_Pos); /* 1us dead time */
TIM1->DIER = TIM_DIER_UIE;
+ TIM1->ARR = 1;
+ TIM1->CR1 |= TIM_CR1_CEN;
NVIC_EnableIRQ(TIM1_BRK_UP_TRG_COM_IRQn);
NVIC_SetPriority(TIM1_BRK_UP_TRG_COM_IRQn, 2);
@@ -98,88 +133,35 @@ int main(void) {
TIM1->EGR |= TIM_EGR_UG;
while (42) {
- /*
- for (uint8_t i=0; i<8; i++) {
- brightness[1] = brightness[5] = i;
- brightness[2] = brightness[6] = 0;
- brightness[3] = brightness[7] = 0;
- do_transpose();
- LL_mDelay(500);
- }
- for (uint8_t i=0; i<8; i++) {
- brightness[1] = brightness[5] = 0;
- brightness[2] = brightness[6] = i;
- brightness[3] = brightness[7] = 0;
- do_transpose();
- LL_mDelay(500);
- }
- for (uint8_t i=0; i<8; i++) {
- brightness[1] = brightness[5] = 0;
- brightness[2] = brightness[6] = 0;
- brightness[3] = brightness[7] = i;
- do_transpose();
- LL_mDelay(500);
- }
- for (uint8_t i=0; i<8; i++) {
- brightness[1] = brightness[5] = i;
- brightness[2] = brightness[6] = i;
- brightness[3] = brightness[7] = i;
+#define HUE_MAX ((1<<NBITS)*6)
+#define HUE_OFFX 0.15F /* 0-1 */
+#define HUE_AMPLITUDE 0.05F /* 0-1 */
+#define CHANNEL_SPACING 1.5F /* in radians */
+#define WHITE 0.2F /* 0-1 */
+ for (float v=0; v<8*M_PI; v += 0.01F) {
+ GPIOA->ODR ^= GPIO_ODR_6;
+ /* generate hsv fade */
+ for (int ch=0; ch<8; ch++) {
+ hue = HUE_MAX * (HUE_OFFX + HUE_AMPLITUDE*sinf(v + ch*CHANNEL_SPACING));
+ hue %= HUE_MAX;
+ hsv_set(ch, hue, WHITE*(1<<NBITS));
+ }
do_transpose();
- LL_mDelay(500);
- }
- }
- {
- */
- for (uint32_t i=0; i<6; i++) {
- for (uint32_t j=0; j<(1<<NBITS); j++) {
- GPIOA->ODR ^= GPIO_ODR_6;
- switch (i) {
- case 0:
- brightness[1] = brightness[5] = (1<<NBITS)-1;
- brightness[2] = brightness[6] = 0;
- brightness[3] = brightness[7] = j;
- break;
- case 1:
- brightness[1] = brightness[5] = (1<<NBITS)-1-j;
- brightness[2] = brightness[6] = 0;
- brightness[3] = brightness[7] = (1<<NBITS)-1;
- break;
- case 2:
- brightness[1] = brightness[5] = 0;
- brightness[2] = brightness[6] = j;
- brightness[3] = brightness[7] = (1<<NBITS)-1;
- break;
- case 3:
- brightness[1] = brightness[5] = 0;
- brightness[2] = brightness[6] = (1<<NBITS)-1;
- brightness[3] = brightness[7] = (1<<NBITS)-1-j;
- break;
- case 4:
- brightness[1] = brightness[5] = j;
- brightness[2] = brightness[6] = (1<<NBITS)-1;
- brightness[3] = brightness[7] = 0;
- break;
- case 5:
- brightness[1] = brightness[5] = (1<<NBITS)-1;
- brightness[2] = brightness[6] = (1<<NBITS)-1-j;
- brightness[3] = brightness[7] = 0;
- break;
- }
- do_transpose();
- LL_mDelay(1);
+ for (int k=0; k<10000; k++) {
+ asm volatile("nop");
}
}
}
}
-uint32_t brightness[8] = {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
-volatile uint8_t brightness_by_bit[NBITS] = { 0 };
+uint32_t brightness[32] = {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
+volatile uint32_t brightness_by_bit[NBITS] = { 0 };
void do_transpose(void) {
for (uint32_t i=0; i<NBITS; i++) {
- uint8_t bv = 0;
+ uint32_t bv = 0;
uint32_t mask = 1<<i;
- for (uint32_t j=0; j<8; j++) {
+ for (uint32_t j=0; j<32; j++) {
if (brightness[j] & mask)
bv |= 1<<j;
}
@@ -187,44 +169,38 @@ void do_transpose(void) {
}
}
-/*
- * 460ns
- * 720ns
- */
-
-/*
- * 1.00us
- * 1.64us
- * 2.84us
- * 5.36us
- * 10.4us
- * 20.4us
- * 40.4us
- * 80.8us
- */
void TIM1_BRK_UP_TRG_COM_IRQHandler(void) {
+ /* The index of the currently active bit. On entry of this function, this is the bit index of the upcoming period.
+ * On exit it is the index of the *next* period. */
static uint32_t idx = 0;
+
+ /* Access bits offset by one as we are setting the *next* period based on idx below. */
+ uint32_t val = brightness_by_bit[idx];
+
idx++;
if (idx >= NBITS)
idx = 0;
- GPIOA->ODR ^= GPIO_ODR_4;
- TIM1->CCMR1 = (4<<TIM_CCMR1_OC2M_Pos); // | TIM_CCMR1_OC2PE;
+ GPIOA->ODR ^= GPIO_ODR_6; /* LED1 */
- SPI1->DR = brightness_by_bit[idx]<<8;
+ /* Shift out the current period's data. The shift register clear and strobe lines are handled by the timers
+ * capture/compare channel 3 complementary outputs. The dead-time generator is used to sequence the clear and strobe
+ * edges one after another. Since there may be small variations in IRQ service latency it is critical to allow for
+ * some leeway between the end of this data transmission and strobe and clear. */
+ SPI1->DR = (val&0xffff);
+ while (SPI1->SR & SPI_SR_BSY);
+ SPI1->DR = (val>>16);
while (SPI1->SR & SPI_SR_BSY);
- const uint32_t period_base = 4; /* 1us */
- const uint32_t period = period_base<<idx;
-// TIM1->BDTR = TIM_BDTR_MOE | (16<<TIM_BDTR_DTG_Pos);
- TIM1->BDTR = TIM_BDTR_MOE | (0<<TIM_BDTR_DTG_Pos);
- TIM1->CCR3 = period-1;
- TIM1->CNT = period-1;
- TIM1->ARR = period;
- TIM1->CCMR1 = (6<<TIM_CCMR1_OC2M_Pos); // | TIM_CCMR1_OC2PE;
- TIM1->EGR |= TIM_EGR_UG;
- TIM1->ARR = 2;
- TIM1->CR1 |= TIM_CR1_CEN;
+ /* Set up everything for the *next* period. The timer is set to count from 0 to ARR. ARR and CCR3 are pre-loaded, so
+ * the values written above will only be latched on timer overrun at the end of this period. This is a little
+ * complicated, but doing it this way has the advantage of keeping both duty cycle and frame rate precisely
+ * constant. */
+ const int period_base = 4; /* 1us */
+ const int period = (period_base<<idx) + 4 /* 1us dead time */;
+ const int timer_cycles_for_spi_transmissions = 128;
+ TIM1->ARR = period + timer_cycles_for_spi_transmissions;
+ TIM1->CCR3 = timer_cycles_for_spi_transmissions;
TIM1->SR &= ~TIM_SR_UIF_Msk;
}
@@ -245,3 +221,9 @@ void PendSV_Handler(void) {
void SysTick_Handler(void) {
}
+/* FIXME */
+void _exit(void) {}
+void *__bss_start__;
+void *__bss_end__;
+
+int __errno;
generated by cgit (git 2.34.1) at 2024-11-05 01:39:05 +0000