使用DMA在STM32F3上生成正弦波-输出乱码

Question

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 ，但是希望您能清楚地看到正在发生的事情-只是用于设置控制寄存器的函数。

#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。

我认为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ADC绘制的表格：

有什么事吗

PS。 如果我让它运行更长的时间，我会得到一些（周期性的）

Answer 1

整个问题是常量标识符中的一个错误字母。 Duuuh

外围大小是使用DMA_CCR_PSIZE_*而不是DMA_CCR_MSIZE_*指定的。

我也弄乱了指针/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);
}

Answer 2

你有没有试过memcpy地方呢？ 它可能与它是静态有关，即。 不在正常堆栈上。 只是一个想法...