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6 years, 7 months ago.
How to use I2S function & SD Card Library(SPI) at same time via STM32F446RE
My device is a STM32F446RE.
I want to use I2S function & SD Card Library at same time.
This device has I2S hardware function. I want to use it.
I tried to import SD Card Library.
https://os.mbed.com/teams/ECE-418012/code/SDFileSystem/
https://os.mbed.com/users/johnvanlaanen/code/SDFlashDisk/
Before I import SD Card Library , I2S works.
But after I import SD Card Library , I2S doesn't work.
I understand , SPI function makes impact to I2S. If I put these dummy code in my program ,I2S doesn't work.
dummy code SPI
int dw(PinName mosi, PinName miso, PinName sclk, PinName cs) {
SPI _spi = SPI(mosi, miso, sclk);
_spi.write(0x40 | 58);
return 0;
}
It's funny . Because in spite of I haven't called this function , I2S doesn't work .
this is sample code from this forum
#include "mbed.h"
I2S_HandleTypeDef hi2s2;
// a full cycle, 16-bit, 2's complement sine wave lookup table
uint16_t SINE_TABLE[256] = {
0x0000, 0x0324, 0x0647, 0x096a, 0x0c8b, 0x0fab, 0x12c8, 0x15e2,
0x18f8, 0x1c0b, 0x1f19, 0x2223, 0x2528, 0x2826, 0x2b1f, 0x2e11,
0x30fb, 0x33de, 0x36ba, 0x398c, 0x3c56, 0x3f17, 0x41ce, 0x447a,
0x471c, 0x49b4, 0x4c3f, 0x4ebf, 0x5133, 0x539b, 0x55f5, 0x5842,
0x5a82, 0x5cb4, 0x5ed7, 0x60ec, 0x62f2, 0x64e8, 0x66cf, 0x68a6,
0x6a6d, 0x6c24, 0x6dca, 0x6f5f, 0x70e2, 0x7255, 0x73b5, 0x7504,
0x7641, 0x776c, 0x7884, 0x798a, 0x7a7d, 0x7b5d, 0x7c29, 0x7ce3,
0x7d8a, 0x7e1d, 0x7e9d, 0x7f09, 0x7f62, 0x7fa7, 0x7fd8, 0x7ff6,
0x7fff, 0x7ff6, 0x7fd8, 0x7fa7, 0x7f62, 0x7f09, 0x7e9d, 0x7e1d,
0x7d8a, 0x7ce3, 0x7c29, 0x7b5d, 0x7a7d, 0x798a, 0x7884, 0x776c,
0x7641, 0x7504, 0x73b5, 0x7255, 0x70e2, 0x6f5f, 0x6dca, 0x6c24,
0x6a6d, 0x68a6, 0x66cf, 0x64e8, 0x62f2, 0x60ec, 0x5ed7, 0x5cb4,
0x5a82, 0x5842, 0x55f5, 0x539b, 0x5133, 0x4ebf, 0x4c3f, 0x49b4,
0x471c, 0x447a, 0x41ce, 0x3f17, 0x3c56, 0x398c, 0x36ba, 0x33de,
0x30fb, 0x2e11, 0x2b1f, 0x2826, 0x2528, 0x2223, 0x1f19, 0x1c0b,
0x18f8, 0x15e2, 0x12c8, 0x0fab, 0x0c8b, 0x096a, 0x0647, 0x0324,
0x0000, 0xfcdc, 0xf9b9, 0xf696, 0xf375, 0xf055, 0xed38, 0xea1e,
0xe708, 0xe3f5, 0xe0e7, 0xdddd, 0xdad8, 0xd7da, 0xd4e1, 0xd1ef,
0xcf05, 0xcc22, 0xc946, 0xc674, 0xc3aa, 0xc0e9, 0xbe32, 0xbb86,
0xb8e4, 0xb64c, 0xb3c1, 0xb141, 0xaecd, 0xac65, 0xaa0b, 0xa7be,
0xa57e, 0xa34c, 0xa129, 0x9f14, 0x9d0e, 0x9b18, 0x9931, 0x975a,
0x9593, 0x93dc, 0x9236, 0x90a1, 0x8f1e, 0x8dab, 0x8c4b, 0x8afc,
0x89bf, 0x8894, 0x877c, 0x8676, 0x8583, 0x84a3, 0x83d7, 0x831d,
0x8276, 0x81e3, 0x8163, 0x80f7, 0x809e, 0x8059, 0x8028, 0x800a,
0x8000, 0x800a, 0x8028, 0x8059, 0x809e, 0x80f7, 0x8163, 0x81e3,
0x8276, 0x831d, 0x83d7, 0x84a3, 0x8583, 0x8676, 0x877c, 0x8894,
0x89bf, 0x8afc, 0x8c4b, 0x8dab, 0x8f1e, 0x90a1, 0x9236, 0x93dc,
0x9593, 0x975a, 0x9931, 0x9b18, 0x9d0e, 0x9f14, 0xa129, 0xa34c,
0xa57e, 0xa7be, 0xaa0b, 0xac65, 0xaecd, 0xb141, 0xb3c1, 0xb64c,
0xb8e4, 0xbb86, 0xbe32, 0xc0e9, 0xc3aa, 0xc674, 0xc946, 0xcc22,
0xcf05, 0xd1ef, 0xd4e1, 0xd7da, 0xdad8, 0xdddd, 0xe0e7, 0xe3f5,
0xe708, 0xea1e, 0xed38, 0xf055, 0xf375, 0xf696, 0xf9b9, 0xfcdc,
};
int main() {
// enable clocks to PORTB, PORTC and SPI2
__GPIOB_CLK_ENABLE();
__GPIOC_CLK_ENABLE();
__SPI2_CLK_ENABLE();
/**I2S2 GPIO Configuration
PC3 ------> I2S2_SD
PB10 ------> I2S2_CK
PB12 ------> I2S2_WS
*/
GPIO_InitTypeDef GPIO_InitStruct;
GPIO_InitStruct.Pin = GPIO_PIN_3;
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_LOW;
GPIO_InitStruct.Alternate = GPIO_AF5_SPI2;
HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);
GPIO_InitStruct.Pin = GPIO_PIN_10|GPIO_PIN_12;
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_LOW;
GPIO_InitStruct.Alternate = GPIO_AF5_SPI2;
HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
// intialize I2S clocks
RCC_PeriphCLKInitTypeDef PeriphClkInitStruct;
//PeriphClkInitStruct.PeriphClockSelection = RCC_PERIPHCLK_I2S;
PeriphClkInitStruct.PeriphClockSelection = RCC_PERIPHCLK_I2S_APB1;
//get 1MHz from 16MHz HSI
PeriphClkInitStruct.PLLI2S.PLLI2SM = 16;
// from reference manual for 44.1kHz (no MCLK)
PeriphClkInitStruct.PLLI2S.PLLI2SR = 2;
PeriphClkInitStruct.PLLI2S.PLLI2SN = 302;
HAL_RCCEx_PeriphCLKConfig(&PeriphClkInitStruct);
// set up I2S
hi2s2.Instance = SPI2;
hi2s2.Init.Mode = I2S_MODE_MASTER_TX;
hi2s2.Init.Standard = I2S_STANDARD_PHILLIPS;
hi2s2.Init.DataFormat = I2S_DATAFORMAT_16B;
hi2s2.Init.MCLKOutput = I2S_MCLKOUTPUT_DISABLE;
hi2s2.Init.AudioFreq = I2S_AUDIOFREQ_44K;
hi2s2.Init.CPOL = I2S_CPOL_LOW;
hi2s2.Init.ClockSource = I2S_CLOCK_PLL;
hi2s2.Init.FullDuplexMode = I2S_FULLDUPLEXMODE_DISABLE;
HAL_I2S_Init(&hi2s2);
int index = 0;
bool channel = false;
while(1) {
if (HAL_I2S_GetState(&hi2s2) == HAL_I2S_STATE_READY)
{
HAL_I2S_Transmit(&hi2s2,&SINE_TABLE[index],1,0);
channel = !channel;
if (channel)
{
index++;
index = index % 256;
}
}
}
}
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I have a small progress.
I just only put these function in main mobule. Then I2S doesn't work.
I think SPI makes impact to I2S. But I still doesn't call these function.
int dw(PinName mosi, PinName miso, PinName sclk, PinName cs) { SPI _spi = SPI(mosi, miso, sclk); _spi.write(0x40 | 58); return 0; }