231 lines
6.3 KiB
C
231 lines
6.3 KiB
C
/*
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* @Author: mypx
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* @Description: ADS8866采集-3线模式(TIM3中断驱动)
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*/
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#include "bsp_collect.h"
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#include "bsp_misc.h"
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#include "et_log.h"
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#include "main.h"
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#include "spi.h"
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#include "tim.h"
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#include <rtthread.h>
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#include <stdlib.h>
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static uint16_t *g_buffer = NULL;
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static uint16_t g_buf_size = 0;
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static uint16_t g_target_count = 0; // 目标采集数
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static volatile uint16_t g_count = 0; // 已采集数
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static dma_full_cb_t g_complete_cb = NULL;
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// 3线模式: DIN保持高, CONVST控制转换+片选
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#define ADS8866_DIN_HIGH() GPIOB->BSRR = (1u << 15)
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#define PB15_AS_GPIO() GPIOB->CRH = (GPIOB->CRH & ~(0xFu << 28)) | (0x3u << 28)
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// 延时n个时钟周期（每个周期≈13.89ns）
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static inline void ns_delay(uint32_t cycles)
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{
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// 关闭编译器优化，确保NOP不被删除
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__asm volatile("1: SUBS %0, %0, #1\n" // 计数器减1
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" BNE 1b" // 若未到0则循环
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: "=r"(cycles) // 输出操作数
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: "0"(cycles) // 输入操作数
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);
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}
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void delay_100ns(void)
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{
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ns_delay(7);
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}
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// 单次读取(在中断里调用,要快速)
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static inline uint16_t ads8866_read_once(void)
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{
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uint16_t rx = 0;
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// ADS8866转换时间约3µs, 等待转换完成
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// 72MHz系统时钟, 1个NOP约14ns, 300个NOP约4.2µs
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for (volatile int i = 0; i < 6; i++)
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delay_100ns();
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// CONVST回到高电平, 数据就绪, 直接SPI读取
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HAL_SPI_Receive(&ADS8866_SPI, (uint8_t *)&rx, 1, 10);
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return rx;
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}
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int bsp_light_data_sampling_init(uint16_t *adc_buf, uint16_t length, dma_full_cb_t cb)
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{
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g_buffer = adc_buf;
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g_buf_size = length;
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g_complete_cb = cb;
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g_count = 0;
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g_target_count = 0;
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// 初始化TIM3(产生CONVST), SPI2(读取数据)
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MX_TIM3_Init();
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MX_SPI2_Init();
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__HAL_SPI_ENABLE(&ADS8866_SPI);
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// PB15(DIN)配置为GPIO并保持高电平
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PB15_AS_GPIO();
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ADS8866_DIN_HIGH();
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ET_INFO("bsp_collect: init done, buf_size=%u", length);
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return 0;
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}
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// // Shell命令: 启动采集指定数量
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// int cstart(int argc, char **argv)
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// {
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// if (argc < 2)
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// {
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// rt_kprintf("Usage: cstart <count>\r\n");
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// return -1;
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// }
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// int count = atoi(argv[1]);
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// if (count <= 0 || count > g_buf_size)
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// {
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// rt_kprintf("cstart: invalid count (1~%u)\r\n", g_buf_size);
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// return -2;
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// }
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// if (!g_buffer)
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// {
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// rt_kprintf("cstart: buffer not init\r\n");
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// return -3;
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// }
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// // 设置目标数量并启动
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// g_count = 0;
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// g_target_count = count;
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// bsp_system_led_on();
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// rt_kprintf("cstart: collecting %d samples...\r\n", count);
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// // 启动TIM3 PWM + 中断
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// HAL_TIM_PWM_Start(&COLLECT_TIM, TIM_CHANNEL_3);
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// HAL_TIM_Base_Start_IT(&COLLECT_TIM);
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// rt_kprintf("cstart: started (non-blocking)\r\n");
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// return 0;
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// }
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// int cprint(int argc, char **argv)
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// {
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// uint16_t n = 32;
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// if (argc >= 2)
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// n = (uint16_t)atoi(argv[1]);
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// if (!g_buffer || g_count == 0)
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// {
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// rt_kprintf("cprint: no data\r\n");
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// return -1;
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// }
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// if (n > g_count)
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// n = g_count;
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// uint16_t minv = 0xFFFF, maxv = 0;
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// uint32_t sum = 0;
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// for (uint16_t i = 0; i < g_count; i++)
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// {
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// uint16_t v = g_buffer[i];
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// if (v < minv)
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// minv = v;
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// if (v > maxv)
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// maxv = v;
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// sum += v;
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// }
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// rt_kprintf("cprint: N=%u min=%u max=%u avg=%lu\r\n", g_count, minv, maxv, sum / g_count);
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// rt_kprintf("first %u (dec / hex):\r\n", n);
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// for (uint16_t i = 0; i < n; i++)
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// {
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// if (i % 8 == 0)
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// rt_kprintf("\r\n[%04u] ", i);
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// rt_kprintf("%5u/0x%04X ", g_buffer[i], g_buffer[i]);
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// }
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// rt_kprintf("\r\n");
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// return 0;
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// }
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// MSH_CMD_EXPORT_ALIAS(cstart, cstart, collect N samples)
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// MSH_CMD_EXPORT_ALIAS(cprint, cprint, print data)
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// 启动采集: 设置目标数量, 启动TIM3+中断
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int bsp_light_data_sampling_start(void)
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{
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if (!g_buffer || g_buf_size == 0)
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{
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ET_ERR("bsp_collect: buffer not initialized");
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return -1;
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}
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g_count = 0;
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g_target_count = g_buf_size; // 采集满缓冲区
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bsp_system_led_on();
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// 启动TIM3 PWM(产生CONVST) + Update中断
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HAL_TIM_PWM_Start(&COLLECT_TIM, TIM_CHANNEL_3);
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HAL_TIM_Base_Start_IT(&COLLECT_TIM);
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//ET_INFO("bsp_collect: start, target=%u", g_target_count);
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return 0;
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}
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// 停止采集
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int bsp_light_data_sampling_stop(void)
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{
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HAL_TIM_Base_Stop_IT(&COLLECT_TIM);
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HAL_TIM_PWM_Stop(&COLLECT_TIM, TIM_CHANNEL_3);
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bsp_system_led_off();
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//ET_INFO("bsp_collect: stopped, collected=%u/%u", g_count, g_target_count);
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return 0;
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}
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uint16_t light_raw_map_u16(uint16_t val)
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{
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/* Avoid integer truncation: do multiply before divide using 32-bit intermediate.
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* Map 0..65535 -> 0..4095. Use rounding by adding half-divisor. */
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uint32_t tmp = (uint32_t)val * 4095u;
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return (uint16_t)(tmp / 65535u + 0.5f);
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}
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float light_raw_map_f32(uint16_t val)
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{
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return (float)(val / 65535.0f * 4095.0f);
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}
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// TIM3中断回调: 每次CONVST触发后采集一个点
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void sampling_tim_elapsed_callback(void)
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{
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// 未启动或已完成
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if (g_target_count == 0 || g_count >= g_target_count)
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return;
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// 读取一个点
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if (g_buffer && g_count < g_buf_size)
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{
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/* drive LED pin high at the start of ISR and low at the end
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* so each interrupt produces one pulse. This makes the pulse
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* frequency equal to the timer update frequency (no 2x toggle
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* ambiguity). */
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bsp_system_led_on();
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g_buffer[g_count] = light_raw_map_u16(ads8866_read_once());
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g_count++;
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bsp_system_led_off();
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// 达到目标数量, 停止并回调
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if (g_count >= g_target_count)
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{
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HAL_TIM_Base_Stop_IT(&COLLECT_TIM);
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HAL_TIM_PWM_Stop(&COLLECT_TIM, TIM_CHANNEL_3);
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bsp_system_led_off();
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//ET_INFO("bsp_collect: complete, N=%u", g_count);
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// 调用完成回调
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if (g_complete_cb)
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g_complete_cb();
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g_target_count = 0; // 标记完成
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}
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}
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}
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