board bringup: adc, usart working

1 files changed, 162 insertions, 0 deletions

diff --git a/gm_platform/fw/main.c.bak b/gm_platform/fw/main.c.bak
new file mode 100644
index 0000000..07d065d
--- /dev/null
+++ b/gm_platform/fw/main.c.bak
@@ -0,0 +1,162 @@
+/* Megumin LED display firmware
+ * Copyright (C) 2018 Sebastian Götte <code@jaseg.net>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "global.h"
+
+#include "adc.h"
+
+volatile unsigned int sys_time = 0;
+volatile unsigned int sys_time_seconds = 0;
+
+void TIM1_BRK_UP_TRG_COM_Handler() {
+    TIM1->SR &= ~TIM_SR_UIF_Msk;
+}
+
+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_PPRE_Msk & ~RCC_CFGR_HPRE_Msk;
+    RCC->CFGR |= ((6-2)<<RCC_CFGR_PLLMUL_Pos) | RCC_CFGR_PLLSRC_HSE_PREDIV; /* PLL x6 -> 48.0MHz */
+    RCC->CR |= RCC_CR_PLLON;
+    while (!(RCC->CR&RCC_CR_PLLRDY));
+    RCC->CFGR |= (2<<RCC_CFGR_SW_Pos);
+    SystemCoreClockUpdate();
+    SysTick_Config(SystemCoreClock/1000); /* 1ms interval */
+
+    /* Turn on lots of neat things */
+    RCC->AHBENR  |= RCC_AHBENR_DMAEN | RCC_AHBENR_GPIOAEN | RCC_AHBENR_FLITFEN;
+    RCC->APB2ENR |= RCC_APB2ENR_SYSCFGEN | RCC_APB2ENR_ADCEN| RCC_APB2ENR_DBGMCUEN | RCC_APB2ENR_TIM1EN | RCC_APB2ENR_TIM1EN;;
+    RCC->APB1ENR |= RCC_APB1ENR_TIM3EN;
+
+    GPIOA->MODER |=
+          (3<<GPIO_MODER_MODER0_Pos)  /* PA0  - Vmeas_A to ADC */
+        | (3<<GPIO_MODER_MODER1_Pos)  /* PA1  - Vmeas_B to ADC */
+        | (1<<GPIO_MODER_MODER2_Pos)  /* PA2  - LOAD */
+        | (1<<GPIO_MODER_MODER3_Pos)  /* PA3  - CH0 */
+        | (1<<GPIO_MODER_MODER4_Pos)  /* PA4  - CH3 */
+        | (0<<GPIO_MODER_MODER5_Pos)  /* PA5  - TP1 */
+        | (1<<GPIO_MODER_MODER6_Pos)  /* PA6  - CH2 */
+        | (1<<GPIO_MODER_MODER7_Pos)  /* PA7  - CH1 */
+        | (0<<GPIO_MODER_MODER9_Pos)  /* PA9  - TP2 */
+        | (0<<GPIO_MODER_MODER10_Pos);/* PA10 - TP3 */
+
+    /* Set shift register IO GPIO output speed */
+    GPIOA->OSPEEDR |=
+          (2<<GPIO_OSPEEDR_OSPEEDR2_Pos)   /* LOAD */
+        | (2<<GPIO_OSPEEDR_OSPEEDR3_Pos)   /* CH0 */
+        | (2<<GPIO_OSPEEDR_OSPEEDR4_Pos)   /* CH3   */
+        | (2<<GPIO_OSPEEDR_OSPEEDR6_Pos)   /* CH2 */
+        | (2<<GPIO_OSPEEDR_OSPEEDR7_Pos);  /* CH1 */
+
+    /* Setup CC1 and CC2. CC2 generates the LED drivers' STROBE, CC1 triggers the IRQ handler */
+    TIM1->BDTR  = TIM_BDTR_MOE;
+    TIM1->CCMR2 = (6<<TIM_CCMR2_OC4M_Pos); /* PWM Mode 1 */
+    TIM1->CCER  = TIM_CCER_CC4E;
+    TIM1->CCR4  = 1;
+    TIM1->DIER  = TIM_DIER_UIE;
+
+    TIM1->PSC   = SystemCoreClock/500000 - 1; /* 0.5us/tick */
+    TIM1->ARR   = 25-1;
+    /* Preload all values */
+    TIM1->EGR  |= TIM_EGR_UG;
+    TIM1->CR1   = TIM_CR1_ARPE;
+    /* And... go! */
+    TIM1->CR1  |= TIM_CR1_CEN;
+
+    void set_outputs(uint8_t val) {
+        int a=!!(val&1), b=!!(val&2), c=!!(val&4), d=!!(val&8);
+        GPIOA->ODR &= ~(!a<<3 | !b<<7 | c<<6 | d<<4);
+        GPIOA->ODR |= a<<3 | b<<7 | !c<<6 | !d<<4;
+    }
+    set_outputs(0);
+
+    adc_init();
+
+    uint8_t out_state = 0x01;
+#define DEBOUNCE 100
+    int debounce_ctr = 0;
+    int val_last = 0;
+    int ctr = 0;
+#define RESET 1000
+    int reset_ctr = 0;
+    while (42) {
+#define FOO 500000
+        if (reset_ctr)
+            reset_ctr--;
+        else
+            set_outputs(0);
+
+        if (debounce_ctr) {
+            debounce_ctr--;
+        } else {
+            int val = !!(GPIOA->IDR & 1);
+            debounce_ctr = DEBOUNCE;
+
+            if (val != val_last) {
+                if (val)
+                    set_outputs(out_state & 0xf);
+                else
+                    set_outputs(out_state >> 4);
+                reset_ctr = RESET;
+                val_last = val;
+                ctr++;
+
+                if (ctr == 100) {
+                    ctr = 0;
+                    out_state = out_state<<1 | out_state>>7;
+                }
+            }
+        }
+        /*
+        for (int i=0; i<FOO; i++) ;
+        set_outputs(0x1);
+        for (int i=0; i<FOO; i++) ;
+        set_outputs(0x2);
+        for (int i=0; i<FOO; i++) ;
+        set_outputs(0x4);
+        for (int i=0; i<FOO; i++) ;
+        set_outputs(0x8);
+        */
+        //for (int i=0; i<8*FOO; i++) ;
+        //GPIOA->ODR ^= 4;
+    }
+}
+
+void NMI_Handler(void) {
+}
+
+void HardFault_Handler(void) __attribute__((naked));
+void HardFault_Handler() {
+    asm volatile ("bkpt");
+}
+
+void SVC_Handler(void) {
+}
+
+
+void PendSV_Handler(void) {
+}
+
+void SysTick_Handler(void) {
+    static int n = 0;
+    sys_time++;
+    if (n++ == 1000) {
+        n = 0;
+        sys_time_seconds++;
+    }
+}
+