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-rw-r--r--prototype/fw/src/main.c152
1 files changed, 111 insertions, 41 deletions
diff --git a/prototype/fw/src/main.c b/prototype/fw/src/main.c
index cf0c9f4..377180b 100644
--- a/prototype/fw/src/main.c
+++ b/prototype/fw/src/main.c
@@ -4,6 +4,16 @@
#include "microcobs.h"
#include "crc32.h"
+static uint8_t crc8_calc(uint8_t *data, size_t len);
+static bool parity_calc(uint8_t *data, size_t len);
+uint32_t mems_trx_word(uint32_t data);
+uint32_t mems_trx_cmd(uint32_t cmd);
+void mems_write_reg(int addr, int val);
+uint32_t mems_read_reg(int addr);
+int16_t mems_read_meas(int ch);
+void mems_spi_init(void);
+void mems_init(void);
+
struct __attribute__((packed)) ll_pkt_trailer {
uint32_t crc32;
};
@@ -14,8 +24,8 @@ struct __attribute__((packed)) req_pkt {
};
struct __attribute__((packed)) res_pkt {
- uint32_t req_seq;
uint32_t res_seq;
+ uint16_t meas_data[16];
struct ll_pkt_trailer trailer;
};
@@ -156,7 +166,7 @@ uint32_t mems_read_reg(int addr) {
int16_t mems_read_meas(int ch) {
ch &= 3;
mems_trx_cmd((ch<<MEMS_OPCODE_Pos) | (1<<MEMS_SEN_Pos));
- for (int i=0; i<2000; i++)
+ for (int i=0; i<10; i++)
asm volatile ("nop");
uint32_t rv = mems_trx_cmd(3<<MEMS_OPCODE_Pos);
/* shift 14-bit data left to align the MSB with the int16_t's sign bit */
@@ -166,7 +176,7 @@ int16_t mems_read_meas(int ch) {
}
void mems_spi_init(void) {
- SPI1->CR1 = (6<<SPI_CR1_BR_Pos) | SPI_CR1_MSTR | SPI_CR1_SSM | SPI_CR1_SSI;
+ SPI1->CR1 = (1<<SPI_CR1_BR_Pos) | SPI_CR1_MSTR | SPI_CR1_SSM | SPI_CR1_SSI;
SPI1->CR2 = (15<<SPI_CR2_DS_Pos);
SPI1->CR1 |= SPI_CR1_SPE;
}
@@ -182,10 +192,40 @@ void mems_init(void) {
mems_write_reg(MEMS_REG_CTRL0, 0x01);
}
+#define WIN_LEN 8
+int16_t meas_buf[WIN_LEN * 3] = {0};
+size_t meas_buf_wptr = 0;
+size_t meas_buf_rptr = 0;
+int res_seq = 0;
+
+void TIM1_BRK_TIM15_IRQHandler (void) {
+ TIM15->SR = 0;
+ int16_t data = mems_read_meas(0);
+
+ /* write into meas_buf as circular buffer */
+ meas_buf[meas_buf_wptr] = data;
+ meas_buf_wptr += 1;
+ if (meas_buf_wptr >= COUNT_OF(meas_buf)) {
+ meas_buf_wptr = 0;
+ }
+
+ /* set read pointer to oldest 8-measurement block by rounding down meas_buf_wptr by 8, then adding 8 and wrapping */
+ size_t tmp = 8 * (meas_buf_wptr / 8 + 1);
+ if (tmp >= COUNT_OF(meas_buf)) {
+ tmp = 0;
+ }
+
+ /* Update sequence pointer when the transmission window changes. */
+ if (tmp != meas_buf_rptr) {
+ res_seq += 1;
+ meas_buf_rptr = tmp;
+ }
+}
+
int main(void) {
RCC->AHBENR |= RCC_AHBENR_GPIOAEN;
- RCC->APB2ENR |= RCC_APB2ENR_USART1EN | RCC_APB2ENR_SPI1EN;
+ RCC->APB2ENR |= RCC_APB2ENR_USART1EN | RCC_APB2ENR_SPI1EN | RCC_APB2ENR_TIM15EN;
#define AFRL(pin, val) ((val) << ((pin)*4))
#define AFRH(pin, val) ((val) << (((pin)-8)*4))
@@ -210,6 +250,12 @@ int main(void) {
SystemCoreClockUpdate();
int apb2_clock = SystemCoreClock / APB2_PRESC;
+ TIM15->PSC = apb2_clock / 1000000 * 100 - 1; /* 100us ticks */
+ TIM15->ARR = 1000 - 1; /* 100ms overflow interrupt interval */
+ TIM15->DIER = TIM_DIER_UIE;
+ TIM15->CR1 = TIM_CR1_CEN;
+ NVIC_EnableIRQ(TIM1_BRK_TIM15_IRQn);
+
int baudrate = 115200;
USART1->CR1 = USART_CR1_TE | USART_CR1_RE;
@@ -217,56 +263,31 @@ int main(void) {
USART1->CR2 |= USART_CR2_RXINV; //| USART_CR2_TXINV;
USART1->CR1 |= USART_CR1_UE;
- /* FIXME DEUBG */
- while (1) {
- mems_init();
- for (int i=0; i<100000; i++)
- asm volatile("nop");
- for (int i=0; i<300; i++) {
- mems_read_meas(0);
- //mems_read_reg(MEMS_REG_ID_SENSOR_TYPE);
- for (int i=0; i<10000; i++)
- asm volatile("nop");
- }
- for (int i=0; i<100000; i++)
- asm volatile("nop");
- }
+ mems_init();
- int req_seq = 0;
- int res_seq = 0;
- struct req_pkt req_buf = { 0 };
struct tx_state tx_st = { 0 };
struct res_pkt res_buf = { 0 };
- uint8_t rx_buf[512];
uint8_t tx_buf[512];
+ /*
+ int req_seq = 0;
+ struct req_pkt req_buf = { 0 };
+ uint8_t rx_buf[512];
size_t rx_char = 0;
unsigned int rx_overrun = 0;
unsigned int rx_cobs_error = 0;
unsigned int rx_framing_error = 0;
unsigned int rx_crc_error = 0;
+ */
USART1->TDR = 0; /* Kick off transmission */
- int i = 0;
while (23) {
if (tx_st.remaining_bytes == 0) {
- if (i > 100) {
- res_buf.req_seq = req_seq;
- res_buf.res_seq = res_seq;
- res_seq += 1;
- packetize(&res_buf, &res_buf.trailer);
- tx_st.tx_char = tx_buf;
- tx_st.remaining_bytes = cobs_encode((uint8_t *)&res_buf, sizeof(res_buf), tx_buf, sizeof(tx_buf));;
- /*
- for (int k=0; k < 8; k++)
- tx_buf[k] = 255-k;
- for (int k=0; k < 8; k++)
- tx_buf[8+k] = (k + 1) % 8;
- tx_st.remaining_bytes = 16;
- */
- i = 0;
- } else {
- i++;
- }
+ res_buf.res_seq = res_seq;
+ memcpy(res_buf.meas_data, meas_buf + meas_buf_rptr, 8 * sizeof(meas_buf[0]));
+ memcpy(res_buf.meas_data + 8, meas_buf + ((meas_buf_rptr + 8) % COUNT_OF(meas_buf)) , 8 * sizeof(meas_buf[0]));
+ packetize(&res_buf, &res_buf.trailer);
+ tx_st.tx_char = tx_buf;
+ tx_st.remaining_bytes = cobs_encode((uint8_t *)&res_buf, sizeof(res_buf), tx_buf, sizeof(tx_buf));;
}
if (USART1->ISR & USART_ISR_TXE && tx_st.remaining_bytes > 0) {
@@ -286,6 +307,8 @@ int main(void) {
if (USART1->ISR & USART_ISR_RXNE) {
uint8_t c = USART1->RDR;
+ (void) c;
+ /*
if (!c) {
if (rx_char < sizeof(rx_buf)) {
int rc = cobs_decode(rx_buf, rx_char, (uint8_t *)&req_buf, sizeof(req_buf));
@@ -313,10 +336,57 @@ int main(void) {
rx_overrun += 1;
}
}
+ */
}
}
}
+void *memcpy(void *restrict dest, const void *restrict src, size_t n)
+{
+ unsigned char *d = dest;
+ const unsigned char *s = src;
+
+ for (; n; n--) *d++ = *s++;
+ return dest;
+}
+
+void *memset(void *dest, int c, size_t n)
+{
+ unsigned char *s = dest;
+ size_t k;
+
+ /* Fill head and tail with minimal branching. Each
+ * conditional ensures that all the subsequently used
+ * offsets are well-defined and in the dest region. */
+
+ if (!n) return dest;
+ s[0] = c;
+ s[n-1] = c;
+ if (n <= 2) return dest;
+ s[1] = c;
+ s[2] = c;
+ s[n-2] = c;
+ s[n-3] = c;
+ if (n <= 6) return dest;
+ s[3] = c;
+ s[n-4] = c;
+ if (n <= 8) return dest;
+
+ /* Advance pointer to align it at a 4-byte boundary,
+ * and truncate n to a multiple of 4. The previous code
+ * already took care of any head/tail that get cut off
+ * by the alignment. */
+
+ k = -(uintptr_t)s & 3;
+ s += k;
+ n -= k;
+ n &= -4;
+
+ for (; n; n--, s++) *s = c;
+
+ return dest;
+}
+
void __libc_init_array (void) __attribute__((weak));
void __libc_init_array ()
{
generated by cgit (git 2.34.1) at 2024-11-22 06:44:14 +0000