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static constants

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This commit is contained in:
Asbelos 2024-09-02 19:47:35 +01:00
parent 45f4bf2041
commit 0433b87445
1 changed files with 17 additions and 14 deletions
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27
IO_I2CRailcom.h
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@ -57,14 +57,6 @@ class I2CRailcom : public IODevice {
private:
// SC16IS752 defines
uint8_t _UART_CH=0x00;
// Communication parameters for the DFPlayer are fixed at 8 bit, No parity, 1 stopbit
const uint8_t WORD_LEN = 0x03; // Value LCR bit 0,1
const uint8_t STOP_BIT = 0x00; // Value LCR bit 2
const uint8_t PARITY_ENA = 0x00; // Value LCR bit 3
const uint8_t PARITY_TYPE = 0x00; // Value LCR bit 4
const uint32_t BAUD_RATE = 250000;
const uint8_t PRESCALER = 0x01; // Value MCR bit 7
const unsigned long SC16IS752_XTAL_FREQ_RAILCOM = 16000000; // Baud rate for Railcom signal
byte _inbuf[65];
byte _outbuf[2];
public:
@ -156,9 +148,17 @@ private:
//
// BAUD_RATE, WORD_LEN, STOP_BIT, PARITY_ENA and PARITY_TYPE have been defined and initialized
//
// Communication parameters 8 bit, No parity, 1 stopbit
static const uint8_t WORD_LEN = 0x03; // Value LCR bit 0,1
static const uint8_t STOP_BIT = 0x00; // Value LCR bit 2
static const uint8_t PARITY_ENA = 0x00; // Value LCR bit 3
static const uint8_t PARITY_TYPE = 0x00; // Value LCR bit 4
static const uint32_t BAUD_RATE = 250000;
static const uint8_t PRESCALER = 0x01; // Value MCR bit 7
static const unsigned long SC16IS752_XTAL_FREQ_RAILCOM = 16000000; // Baud rate for Railcom signal
static const uint16_t _divisor = (SC16IS752_XTAL_FREQ_RAILCOM / PRESCALER) / (BAUD_RATE * 16);
void Init_SC16IS752(){
//uint16_t _divisor = (SC16IS752_XTAL_FREQ / PRESCALER) / (BAUD_RATE * 16);
const uint16_t _divisor = (SC16IS752_XTAL_FREQ_RAILCOM / PRESCALER) / (BAUD_RATE * 16); // Calculate _divisor for baudrate
if (_UART_CH==0) {
// only reset on channel 0}
@ -168,13 +168,16 @@ private:
UART_WriteRegister(REG_FCR, 0x07,false); // Reset FIFO, clear RX & TX FIFO (write only)
UART_WriteRegister(REG_MCR, 0x00); // Set MCR to all 0, includes Clock divisor
UART_WriteRegister(REG_LCR, 0x80 | WORD_LEN | STOP_BIT | PARITY_ENA | PARITY_TYPE); // Divisor latch enabled
UART_WriteRegister(REG_LCR, 0x80); // Divisor latch enabled
UART_WriteRegister(REG_DLL, _divisor); // Write DLL
UART_WriteRegister(REG_DLH, (uint8_t)(_divisor >> 8)); // Write DLH
UART_WriteRegister(REG_LCR, UART_ReadRegister(REG_LCR) & 0x7F); // Divisor latch disabled
UART_WriteRegister(REG_LCR, WORD_LEN | STOP_BIT | PARITY_ENA | PARITY_TYPE); // Divisor latch disabled
UART_WriteRegister(REG_FCR, 0x07,false); // Reset FIFO, clear RX & TX FIFO (write only)
if (_deviceState==DEVSTATE_INITIALISING) {
DIAG(F("UART %d init complete"),_UART_CH);
}
}