/* Get divider value */
STATIC uint8_t getClkDiv(LPC_ADC_T *pADC, bool burstMode, uint32_t adcRate, uint8_t clks)
{
uint32_t adcBlockFreq;
uint32_t fullAdcRate;
uint8_t div;
/* The APB clock (PCLK_ADC0) is divided by (CLKDIV+1) to produce the clock for
A/D converter, which should be less than or equal to 4.5MHz.
A fully conversion requires (bits_accuracy+1) of these clocks.
ADC Clock = PCLK_ADC0 / (CLKDIV + 1);
ADC rate = ADC clock / (the number of clocks required for each conversion);
*/
#if defined(CHIP_LPC175X_6X)
adcBlockFreq = Chip_Clock_GetPeripheralClockRate(SYSCTL_PCLK_ADC);
#else
adcBlockFreq = Chip_Clock_GetPeripheralClockRate();
#endif
#if defined(ADC_ACC_12BITS)
fullAdcRate = adcRate * getFullConvClk();
#else
if (burstMode) {
fullAdcRate = adcRate * clks;
}
else {
fullAdcRate = adcRate * getFullConvClk();
}
#endif
/* Get the round value by fomular: (2*A + B)/(2*B) */
div = ((adcBlockFreq * 2 + fullAdcRate) / (fullAdcRate * 2)) - 1;
return div;
}
static void initHardware(void)
{
SystemCoreClockUpdate();
SysTick_Config(SystemCoreClock/1000);
Board_Init();
Board_LED_Set(0, false);
/* Timer */
Chip_TIMER_Init(LPC_TIMER1);
Chip_TIMER_PrescaleSet(LPC_TIMER1,
#ifdef lpc1769
Chip_Clock_GetPeripheralClockRate(SYSCTL_PCLK_TIMER1) / 1000000 - 1
#else
Chip_Clock_GetRate(CLK_MX_TIMER1) / 1000000 - 1
#endif
);
/* Match 0 (period) */
Chip_TIMER_MatchEnableInt(LPC_TIMER1, 0);
Chip_TIMER_ResetOnMatchEnable(LPC_TIMER1, 0);
Chip_TIMER_StopOnMatchDisable(LPC_TIMER1, 0);
Chip_TIMER_SetMatch(LPC_TIMER1, 0, 1000);
/* Match 1 (duty) */
Chip_TIMER_MatchEnableInt(LPC_TIMER1, 1);
Chip_TIMER_ResetOnMatchDisable(LPC_TIMER1, 1);
Chip_TIMER_StopOnMatchDisable(LPC_TIMER1, 1);
Chip_TIMER_SetMatch(LPC_TIMER1, 1, 100);
Chip_TIMER_Reset(LPC_TIMER1);
Chip_TIMER_Enable(LPC_TIMER1);
NVIC_EnableIRQ(TIMER1_IRQn);
}
static uint32_t Chip_UART_GetClockRate(LPC_USART_T *pUART) {
#if !defined(CHIP_LPC175X_6X)
return Chip_Clock_GetPeripheralClockRate();
#else
/* Pick clock for uart BASED ON SELECTED uart */
if (pUART == LPC_UART1) {
return Chip_Clock_GetPeripheralClockRate(SYSCTL_PCLK_UART1);
}
else if (pUART == LPC_UART2) {
return Chip_Clock_GetPeripheralClockRate(SYSCTL_PCLK_UART2);
}
else if (pUART == LPC_UART3) {
return Chip_Clock_GetPeripheralClockRate(SYSCTL_PCLK_UART3);
}
else {
return Chip_Clock_GetPeripheralClockRate(SYSCTL_PCLK_UART0);
}
#endif
}
/* Set SD_CLK Clock */
void Chip_SDC_SetClock(LPC_SDC_T *pSDC, uint32_t freq)
{
uint32_t PClk;
uint32_t ClkValue = 0;
PClk = Chip_Clock_GetPeripheralClockRate();
ClkValue = (PClk + 2 * freq - 1) / (2 * freq);
if (ClkValue > 0) {
ClkValue -= 1;
}
Chip_SDC_SetClockDiv(pSDC, ClkValue);
}
/* Get divider value for */
STATIC uint8_t getAdcClkDiv(uint32_t adcRate)
{
uint32_t adcBlockFreq;
uint32_t fullAdcRate;
uint8_t div;
/* The APB clock (PCLK_ADC0) is divided by (CLKDIV+1) to produce the clock for
* A/D converter, which should be less than or equal to 12.4MHz.
* A fully conversion requires 31 of these clocks.
* ADC clock = PCLK_ADC0 / (CLKDIV + 1);
* ADC rate = ADC clock / (the number of clocks required for each conversion);
*/
#if defined(CHIP_LPC175X_6X)
adcBlockFreq = Chip_Clock_GetPeripheralClockRate(SYSCTL_PCLK_ADC);
fullAdcRate = adcRate * 65;
#else
adcBlockFreq = Chip_Clock_GetPeripheralClockRate();
fullAdcRate = adcRate * 31;
#endif
/* Get the round value by fomular: (2*A + B)/(2*B) */
div = ((adcBlockFreq * 2 + fullAdcRate) / (fullAdcRate * 2)) - 1;
return div;
}
/* Configure I2S for Audio Format input */
Status Chip_I2S_Config(LPC_I2S_T *pI2S, uint8_t TRMode, Chip_I2S_Audio_Format_T *audio_format)
{
uint32_t pClk;
uint32_t x, y;
uint64_t divider;
uint16_t dif;
uint16_t x_divide = 0, y_divide = 0;
uint32_t N;
uint16_t err, ErrorOptimal = 0xFFFF;
Chip_Clock_EnablePeriphClock(SYSCTL_CLOCK_I2S);
#if defined(CHIP_LPC175X_6X)
pClk = Chip_Clock_GetPeripheralClockRate(SYSCTL_PCLK_I2S);
#else
pClk = Chip_Clock_GetPeripheralClockRate();
#endif
/* divider is a fixed point number with 16 fractional bits */
divider = (((uint64_t) (audio_format->SampleRate) * 2 * (audio_format->WordWidth) * 2) << 16) / pClk;
/* find N that make x/y <= 1 -> divider <= 2^16 */
for (N = 64; N > 0; N--) {
if ((divider * N) < (1 << 16)) {
break;
}
}
if (N == 0) {
return ERROR;
}
divider *= N;
for (y = 255; y > 0; y--) {
x = y * divider;
if (x & (0xFF000000)) {
continue;
}
dif = x & 0xFFFF;
if (dif > 0x8000) {
err = 0x10000 - dif;
}
else {
err = dif;
}
if (err == 0) {
y_divide = y;
break;
}
else if (err < ErrorOptimal) {
ErrorOptimal = err;
y_divide = y;
}
}
x_divide = ((uint64_t) y_divide * (audio_format->SampleRate) * 2 * (audio_format->WordWidth) * N * 2) / pClk;
if (x_divide >= 256) {
x_divide = 0xFF;
}
if (x_divide == 0) {
x_divide = 1;
}
if (audio_format->WordWidth <= 8) {
IP_I2S_SetWordWidth(pI2S, TRMode, I2S_WORDWIDTH_8);
}
else if (audio_format->WordWidth <= 16) {
IP_I2S_SetWordWidth(pI2S, TRMode, I2S_WORDWIDTH_16);
}
else {
IP_I2S_SetWordWidth(pI2S, TRMode, I2S_WORDWIDTH_32);
}
IP_I2S_SetMono(pI2S, TRMode, (audio_format->ChannelNumber) == 1 ? I2S_MONO : I2S_STEREO);
IP_I2S_SetMasterSlaveMode(pI2S, TRMode, I2S_MASTER_MODE);
IP_I2S_SetWS_Halfperiod(pI2S, TRMode, audio_format->WordWidth - 1);
IP_I2S_ModeConfig(pI2S, TRMode, I2S_TXMODE_CLKSEL(0), !I2S_TXMODE_4PIN_ENABLE, !I2S_TXMODE_MCENA);
IP_I2S_SetBitRate(pI2S, TRMode, N - 1);
IP_I2S_SetXYDivider(pI2S, TRMode, x_divide, y_divide);
return SUCCESS;
}
