2

我正在尝试使用 const 表、DMA 和 DAC 生成波形。

这是 Discovery F3 板上的 STM32F303VCT。

我正在使用libopencm3，但我希望你能清楚地看到发生了什么 - 这只是设置控制寄存器的功能。

#define SINE_TABLE_LEN 256

static const uint16_t sine_table[] = {
    2047, 2097, 2147, 2198, 2248, 2298, 2347, 2397, 2446, 2496, 2544, 2593, 2641, 2689, 2737, 2784, 2830, 2877, 2922, 2967, 3012, 3056, 3099, 3142, 3184, 3226, 3266, 3306, 3346, 3384, 3422, 3458, 3494, 3530, 3564, 3597, 3629, 3661, 3691, 3721, 3749, 3776, 3803, 3828, 3852, 3875, 3897, 3918, 3938, 3957, 3974, 3991, 4006, 4020, 4033, 4044, 4055, 4064, 4072, 4079, 4084, 4088, 4092, 4093, 4094, 4093, 4092, 4088, 4084, 4079, 4072, 4064, 4055, 4044, 4033, 4020, 4006, 3991, 3974, 3957, 3938, 3918, 3897, 3875, 3852, 3828, 3803, 3776, 3749, 3721, 3691, 3661, 3629, 3597, 3564, 3530, 3494, 3458, 3422, 3384, 3346, 3306, 3266, 3226, 3184, 3142, 3099, 3056, 3012, 2967, 2922, 2877, 2830, 2784, 2737, 2689, 2641, 2593, 2544, 2496, 2446, 2397, 2347, 2298, 2248, 2198, 2147, 2097, 2047, 1997, 1947, 1896, 1846, 1796, 1747, 1697, 1648, 1598, 1550, 1501, 1453, 1405, 1357, 1310, 1264, 1217, 1172, 1127, 1082, 1038, 995, 952, 910, 868, 828, 788, 748, 710, 672, 636, 600, 564, 530, 497, 465, 433, 403, 373, 345, 318, 291, 266, 242, 219, 197, 176, 156, 137, 120, 103, 88, 74, 61, 50, 39, 30, 22, 15, 10, 6, 2, 1, 0, 1, 2, 6, 10, 15, 22, 30, 39, 50, 61, 74, 88, 103, 120, 137, 156, 176, 197, 219, 242, 266, 291, 318, 345, 373, 403, 433, 465, 497, 530, 564, 600, 636, 672, 710, 748, 788, 828, 868, 910, 952, 995, 1038, 1082, 1127, 1172, 1217, 1264, 1310, 1357, 1405, 1453, 1501, 1550, 1598, 1648, 1697, 1747, 1796, 1846, 1896, 1947, 1997
//  0, 16, 32, 48, 64, 80, 96, 112, 128, 144, 160, 176, 192, 208, 224, 240, 256, 272, 288, 304, 320, 336, 352, 368, 384, 400, 416, 432, 448, 464, 480, 496, 512, 528, 544, 560, 576, 592, 608, 624, 640, 656, 672, 688, 704, 720, 736, 752, 768, 784, 800, 816, 832, 848, 864, 880, 896, 912, 928, 944, 960, 976, 992, 1008, 1024, 1040, 1056, 1072, 1088, 1104, 1120, 1136, 1152, 1168, 1184, 1200, 1216, 1232, 1248, 1264, 1280, 1296, 1312, 1328, 1344, 1360, 1376, 1392, 1408, 1424, 1440, 1456, 1472, 1488, 1504, 1520, 1536, 1552, 1568, 1584, 1600, 1616, 1632, 1648, 1664, 1680, 1696, 1712, 1728, 1744, 1760, 1776, 1792, 1808, 1824, 1840, 1856, 1872, 1888, 1904, 1920, 1936, 1952, 1968, 1984, 2000, 2016, 2032, 2048, 2063, 2079, 2095, 2111, 2127, 2143, 2159, 2175, 2191, 2207, 2223, 2239, 2255, 2271, 2287, 2303, 2319, 2335, 2351, 2367, 2383, 2399, 2415, 2431, 2447, 2463, 2479, 2495, 2511, 2527, 2543, 2559, 2575, 2591, 2607, 2623, 2639, 2655, 2671, 2687, 2703, 2719, 2735, 2751, 2767, 2783, 2799, 2815, 2831, 2847, 2863, 2879, 2895, 2911, 2927, 2943, 2959, 2975, 2991, 3007, 3023, 3039, 3055, 3071, 3087, 3103, 3119, 3135, 3151, 3167, 3183, 3199, 3215, 3231, 3247, 3263, 3279, 3295, 3311, 3327, 3343, 3359, 3375, 3391, 3407, 3423, 3439, 3455, 3471, 3487, 3503, 3519, 3535, 3551, 3567, 3583, 3599, 3615, 3631, 3647, 3663, 3679, 3695, 3711, 3727, 3743, 3759, 3775, 3791, 3807, 3823, 3839, 3855, 3871, 3887, 3903, 3919, 3935, 3951, 3967, 3983, 3999, 4015, 4031, 4047, 4063, 4079
};    

void send_dac_sine()
{
    const uint32_t dma = DMA2;
    const uint32_t ch = DMA_CHANNEL3;

    dac_dma_disable(CHANNEL_1);
    dma_disable_channel(dma, ch);
    dma_channel_reset(dma, ch);

    // DMA config
    dma_enable_circular_mode(dma, ch);

    dma_set_peripheral_address(dma, ch, (uint32_t) &DAC_DHR12R1);
    dma_set_memory_address(dma, ch, (uint32_t) sine_table);

    dma_set_memory_size(dma, ch, DMA_CCR_MSIZE_16BIT); // uint16_t
    dma_set_peripheral_size(dma, ch, DMA_CCR_MSIZE_32BIT); // 32-bit register
    dma_set_number_of_data(dma, ch, SINE_TABLE_LEN);
    dma_enable_memory_increment_mode(dma, ch); // incr mem. addr
    dma_disable_peripheral_increment_mode(dma, ch); // keep periph addr
    dma_set_read_from_memory(dma, ch); // memory -> periph

    dma_set_priority(dma, ch, DMA_CCR_PL_VERY_HIGH);

    // launch

    dac_dma_enable(CHANNEL_1); // enable the DAC to send DMA requests
    dma_enable_channel(dma, ch);
}

DAC 由 TIMER6 TRGO 触发。

我想我在表定义或表内存地址中一定有一些错误。

DMA 正在运行，我可以看到发送到 DAC 的内容。

但是，这不是我的表格 - 这是它绘制的，由 ADC 捕获：

在此处输入图像描述

有什么问题？

附言。如果我让它运行更长时间，我会得到一些东西（它是周期性的）

在此处输入图像描述

4

2 回答 2

3

整个问题是常量标识符中的一个错误字母。嘟嘟

外围尺寸用 指定DMA_CCR_PSIZE_*，而不是DMA_CCR_MSIZE_*。

我也搞砸了指针/地址......

完整的工作代码：

#define SINE_TABLE_LEN 256
const uint16_t sine_table[SINE_TABLE_LEN] = { // now with actual sine
    2047, 2097, 2147, 2198, 2248, 2298, 2347, 2397, 2446, 2496, 2544, 2593, 2641, 2689, 2737, 2784, 2830, 2877, 2922, 2967, 3012, 3056, 3099, 3142, 3184, 3226, 3266, 3306, 3346, 3384, 3422, 3458, 3494, 3530, 3564, 3597, 3629, 3661, 3691, 3721, 3749, 3776, 3803, 3828, 3852, 3875, 3897, 3918, 3938, 3957, 3974, 3991, 4006, 4020, 4033, 4044, 4055, 4064, 4072, 4079, 4084, 4088, 4092, 4093, 4094, 4093, 4092, 4088, 4084, 4079, 4072, 4064, 4055, 4044, 4033, 4020, 4006, 3991, 3974, 3957, 3938, 3918, 3897, 3875, 3852, 3828, 3803, 3776, 3749, 3721, 3691, 3661, 3629, 3597, 3564, 3530, 3494, 3458, 3422, 3384, 3346, 3306, 3266, 3226, 3184, 3142, 3099, 3056, 3012, 2967, 2922, 2877, 2830, 2784, 2737, 2689, 2641, 2593, 2544, 2496, 2446, 2397, 2347, 2298, 2248, 2198, 2147, 2097, 2047, 1997, 1947, 1896, 1846, 1796, 1747, 1697, 1648, 1598, 1550, 1501, 1453, 1405, 1357, 1310, 1264, 1217, 1172, 1127, 1082, 1038, 995, 952, 910, 868, 828, 788, 748, 710, 672, 636, 600, 564, 530, 497, 465, 433, 403, 373, 345, 318, 291, 266, 242, 219, 197, 176, 156, 137, 120, 103, 88, 74, 61, 50, 39, 30, 22, 15, 10, 6, 2, 1, 0, 1, 2, 6, 10, 15, 22, 30, 39, 50, 61, 74, 88, 103, 120, 137, 156, 176, 197, 219, 242, 266, 291, 318, 345, 373, 403, 433, 465, 497, 530, 564, 600, 636, 672, 710, 748, 788, 828, 868, 910, 952, 995, 1038, 1082, 1127, 1172, 1217, 1264, 1310, 1357, 1405, 1453, 1501, 1550, 1598, 1648, 1697, 1747, 1796, 1846, 1896, 1947, 1997
};

void send_dac_sine()
{
    const uint32_t dma = DMA2;
    const uint32_t ch = DMA_CHANNEL3;

    dac_set_waveform_generation(DAC_CR_WAVE1_DIS);
    dac_dma_disable(CHANNEL_1);
    dma_disable_channel(dma, ch);
    dma_channel_reset(dma, ch);

    dma_enable_circular_mode(dma, ch);
    dma_set_peripheral_address(dma, ch, (uint32_t) &DAC_DHR12R1);
    dma_set_memory_address(dma, ch, (uint32_t) &sine_table);
    dma_set_memory_size(dma, ch, DMA_CCR_MSIZE_16BIT);
    dma_set_peripheral_size(dma, ch, DMA_CCR_PSIZE_16BIT);
    dma_set_read_from_memory(dma, ch);
    dma_set_number_of_data(dma, ch, SINE_TABLE_LEN);

    dma_set_priority(dma, ch, DMA_CCR_PL_VERY_HIGH);

    dma_enable_memory_increment_mode(dma, ch);
    dma_disable_peripheral_increment_mode(dma, ch);

    dac_dma_enable(CHANNEL_1);
    dma_enable_channel(dma, ch);
}
于 2015-10-30T20:54:19.083 回答
1

你在memcpy某个地方试过吗？它可能与它是静态的有关，即。不在正常堆栈上。只是一个想法...

于 2015-10-30T18:53:38.927 回答