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driver/fw: Handle blink from systick

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This commit is contained in:
jaseg 2019-03-05 00:09:32 +09:00
parent d48b92b935
commit dc040a71cc
1 changed files with 24 additions and 24 deletions
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48
driver_fw/main.c
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@ -51,6 +51,10 @@ enum STATUS_LEDS {
};
static void set_status_leds(uint8_t val) {
/* Reset strobe. Will be set in systick handler */
GPIOA->BRR = 1<<4;
//for (int i=0; i<100; i++)
// asm volatile ("nop");
/* Workaround for *nasty* hardware behavior: If SPI data width is configured as 8 bit but DR is written as 16
* bit, SPI actually sends 16 clock cycles. Thus, we have to make sure the compiler emits a 8-bit write here.
* Thanks, TI! */
@ -87,6 +91,9 @@ int main(void) {
| (2<<GPIO_MODER_MODER9_Pos) /* PA9 - SCL */
| (2<<GPIO_MODER_MODER10_Pos);/* PA10 - SDA */
GPIOA->OSPEEDR =
(3<<GPIO_OSPEEDR_OSPEEDR4_Pos);
GPIOA->AFR[0] =
(1<<GPIO_AFRL_AFSEL1_Pos) /* PA1 */
| (1<<GPIO_AFRL_AFSEL2_Pos) /* PA2 */
@ -115,24 +122,9 @@ int main(void) {
SPI_CR1_SSM
| SPI_CR1_SSI
| (6<<SPI_CR1_BR_Pos)
| SPI_CR1_MSTR
| SPI_CR1_CPHA;
| SPI_CR1_MSTR;
SPI1->CR1 |= SPI_CR1_SPE;
/* FIXME debug code */
for (;;) {
set_status_leds((sys_time & (1<<6)) ? STATUS_LED_OPERATION : 0);
/* Toggle strobe */
GPIOA->BSRR = 1<<4;
for (int j = 0; j<100; j++)
asm volatile ("nop");
GPIOA->BRR = 1<<4;
for (int j = 0; j<100000; j++)
asm volatile ("nop");
}
#if 0
/* TIM3 running off 48MHz APB1 clk, T=20.833ns */
TIM3->CR1 = 0; /* Disable ARR preload (double-buffering) */
TIM3->PSC = 48-1; /* Prescaler 48 -> f=1MHz/T=1us */
@ -147,10 +139,10 @@ int main(void) {
xfr_8b10b_encode_reset(&txstate.st);
txstate.current_symbol = txstate.next_symbol = xfr_8b10b_encode(&txstate.st, K28_1) | 1<<10;
TIM1->EGR |= TIM_EGR_UG;
TIM3->EGR |= TIM_EGR_UG;
NVIC_EnableIRQ(TIM1_UP_IRQn);
NVIC_SetPriority(TIM1_UP_IRQn, 3<<4);
NVIC_EnableIRQ(TIM3_IRQn);
NVIC_SetPriority(TIM3_IRQn, 3<<4);
uint8_t txbuf[3] = {0x01, 0x05, 0x01};
int txpos = -1;
@ -181,7 +173,6 @@ int main(void) {
}
}
}
#endif
}
int flipbits(int in) {
@ -199,20 +190,20 @@ int flipbits(int in) {
}
void TIM1_UP_IRQHandler() {
TIM1->SR &= ~TIM_SR_UIF;
void TIM3_IRQHandler() {
TIM3->SR &= ~TIM_SR_UIF;
int sym = txstate.current_symbol;
int bit = sym&1;
sym >>= 1;
if (sym == 1) { /* last bit shifted out */
if (txstate.next_symbol == -NO_SYMBOL) /*FIXME debug code*/
asm volatile("bkpt");
//asm volatile("bkpt");
sym = flipbits(txstate.next_symbol) | 1<<10;
txstate.next_symbol = -NO_SYMBOL;
}
txstate.current_symbol = sym;
TIM1->CCR1 = bit ? 0xffff : 0x0000;
TIM3->CCR1 = bit ? 0xffff : 0x0000;
}
void NMI_Handler(void) {
@ -231,7 +222,16 @@ void PendSV_Handler(void) {
}
void SysTick_Handler(void) {
static int bit = 0;
bit = !bit;
sys_time++;
/* This is a hack. We could use the SPI interrupt here if that didn't fire at the start instead of end of transmission.... -.- */
if (bit)
set_status_leds((sys_time & (1<<6)) ? STATUS_LED_OPERATION : 0);
else
GPIOA->BSRR = 1<<4;
}
void _init(void) {