diff options
| -rw-r--r-- | fw/main.c | 84 |
1 files changed, 54 insertions, 30 deletions
@@ -3,6 +3,7 @@ #include <stdint.h> #include <system_stm32f0xx.h> #include <stm32f0xx_ll_utils.h> +#include <stm32f0xx_ll_spi.h> #include <string.h> #include <unistd.h> /* @@ -14,12 +15,30 @@ void tick(void) { __asm__("nop"); } +void spi_send(int data) { + SPI1->DR = data; + while (SPI1->SR & SPI_SR_BSY); +} + +void strobe_aux(void) { + GPIOA->BSRR = GPIO_BSRR_BS_10; + tick(); + GPIOA->BSRR = GPIO_BSRR_BR_10; +} + +void strobe_leds(void) { + GPIOA->BSRR = GPIO_BSRR_BS_9; + tick(); + GPIOA->BSRR = GPIO_BSRR_BR_9; +} + 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_HSE_PREDIV; /* PLL x4 */ - RCC->CFGR2 &= ~RCC_CFGR2_PREDIV_Msk; /* PREDIV=0 */ + RCC->CFGR2 &= ~RCC_CFGR2_PREDIV_Msk; + RCC->CFGR2 |= RCC_CFGR2_PREDIV_DIV2; RCC->CR |= RCC_CR_PLLON; while (!(RCC->CR&RCC_CR_PLLRDY)); RCC->CFGR |= (2<<RCC_CFGR_SW_Pos); @@ -32,50 +51,55 @@ int main(void) { GPIOA->MODER |= (2<<GPIO_MODER_MODER5_Pos) /* PA5 - SCLK */ + | (1<<GPIO_MODER_MODER6_Pos) /* PA6 - LED !OE */ | (2<<GPIO_MODER_MODER7_Pos) /* PA7 - MOSI */ | (1<<GPIO_MODER_MODER9_Pos) /* PA9 - LED strobe */ | (1<<GPIO_MODER_MODER10_Pos);/* PA10 - Auxiliary strobe */ /* Set shift register IO GPIO output speed */ GPIOA->OSPEEDR |= - (3<<GPIO_OSPEEDR_OSPEEDR5_Pos) /* SCLK */ - | (3<<GPIO_OSPEEDR_OSPEEDR7_Pos) /* MOSI */ - | (3<<GPIO_OSPEEDR_OSPEEDR9_Pos) /* LED strobe */ - | (3<<GPIO_OSPEEDR_OSPEEDR10_Pos); /* Auxiliary strobe */ + (2<<GPIO_OSPEEDR_OSPEEDR5_Pos) /* SCLK FIXME maybe try 0x2 here? */ + | (2<<GPIO_OSPEEDR_OSPEEDR6_Pos) /* LED !OE */ + | (2<<GPIO_OSPEEDR_OSPEEDR7_Pos) /* MOSI */ + | (2<<GPIO_OSPEEDR_OSPEEDR9_Pos) /* LED strobe */ + | (2<<GPIO_OSPEEDR_OSPEEDR10_Pos); /* Auxiliary strobe */ GPIOA->AFR[0] |= (0<<GPIO_AFRL_AFRL5_Pos) /* SPI1_SCK */ | (0<<GPIO_AFRL_AFRL7_Pos); /* SPI1_MOSI */ /* Configure SPI controller */ - SPI1->CR1 = SPI_CR1_SSM | SPI_CR1_SSI | SPI_CR1_SPE | (7<<SPI_CR1_BR_Pos) | SPI_CR1_MSTR; - SPI1->CR2 = (7<<SPI_CR2_DS_Pos); - - int pos1 = 0; - int pos2 = 0; - + SPI1->I2SCFGR = 0; + SPI1->CR2 &= ~SPI_CR2_DS_Msk; + SPI1->CR2 &= ~SPI_CR2_DS_Msk; + SPI1->CR2 |= LL_SPI_DATAWIDTH_16BIT; + /* FIXME maybe try w/o BIDI */ + SPI1->CR1 = SPI_CR1_BIDIMODE | SPI_CR1_BIDIOE | SPI_CR1_SSM | SPI_CR1_SSI | SPI_CR1_SPE | (1<<SPI_CR1_BR_Pos) | SPI_CR1_MSTR | SPI_CR1_CPOL | SPI_CR1_CPHA; + + int i = 0; + int val = 0x5555; + GPIOA->BSRR = GPIO_BSRR_BR_6; while (42) { - for (int i=0; i<6; i++) { - if (pos1 == i) { - SPI1->DR = 1<<pos2; - } else { - SPI1->DR = 0; - } - while (SPI1->SR & SPI_SR_BSY); - tick(); + if (i == 8) { + i = 0; + val = ~val; } - pos2 += 1; - if (pos2 == 8) { - pos2 = 0; - pos1 += 1; - if (pos1 == 6) - pos1 = 0; + spi_send((i&1 ? 0xfa00 : 0xf000) | (0xff^(1<<i))); + i++; // 1100'0100"0000'0000 + strobe_aux(); + + spi_send(val); + spi_send(val); + strobe_leds(); + /*if (i == 32) { + i = 0; } - /* Strobe both LED drivers and aux regs */ - GPIOA->BSRR = GPIO_BSRR_BS_9 | GPIO_BSRR_BS_10; - tick(); - GPIOA->BSRR = GPIO_BSRR_BR_9 | GPIO_BSRR_BR_10; - LL_mDelay(1); + i++; + spi_send((i&16) ? 0 : (1<<i)); + spi_send((i&16) ? (1<<(i&15)) : 0); + strobe_leds(); + */ + LL_mDelay(200); } } |