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ch552: Use the new hardware CTS signals for UART access

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- Use CTS signals to let the FPGA and CH552 signal each other that
    it is OK send UART data.
  - Update the CH552 rx and frame handling logic.
  - Fix minor spelling errors and indentation
This commit is contained in:
Jonas Thörnblad 2024-12-17 17:33:14 +01:00 • committed by Mikael Ågren
parent ab4ef5fdf9
commit 0a634c76da
No known key found for this signature in database
GPG key ID: E02DA3D397792C46
4 changed files with 237 additions and 93 deletions
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33
hw/usb_interface/ch552_fw/include/debug.h
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@ -38,10 +38,22 @@
//#define UART1_BAUD 1000000
#endif
void CfgFsys(); // CH554 clock selection and configuration
void CfgFsys(void); // CH554 clock selection and configuration
void mDelayuS(uint16_t n); // Delay in units of uS
void mDelaymS(uint16_t n); // Delay in mS
// Set pin p1.4 and p1.5 to GPIO output mode.
void gpio_init(void);
void gpio_set(uint8_t pin);
void gpio_unset(uint8_t pin);
uint8_t gpio_get(uint8_t pin);
void gpio_init_p1_4_in(void);
void gpio_init_p1_5_out(void);
uint8_t gpio_p1_4_get(void);
void gpio_p1_5_set(void);
void gpio_p1_5_unset(void);
/*******************************************************************************
* Function Name : CH554UART0Alter()
* Description : Set the alternate pin mappings for UART0 (RX on P1.2, TX on P1.3)
@ -83,7 +95,7 @@ inline void mInitSTDIO( )
}
TMOD = (TMOD & ~bT1_GATE & ~bT1_CT & ~MASK_T1_MOD) | bT1_M1; // Timer1 as 8-bit auto-reload timer
T2MOD = T2MOD | bTMR_CLK | bT1_CLK; // Timer1 clock selection
TH1 = 0-x; // 12MHz crystal oscillator, buad / 12 is the actual need to set the baud rate
TH1 = 0-x; // 12MHz crystal oscillator, baud / 12 is the actual need to set the baud rate
TR1 = 1; // Start timer 1
TI = 1; // Enable transmit interrupt
REN = 1; // UART0 receive enable
@ -191,16 +203,18 @@ inline void CH554UART1SendBuffer(uint8_t *Buf, uint32_t Len)
{
uint32_t Count = 0;
while (Count < Len) {
SBUF1 = Buf[Count++];
while (U1TI == 0)
;
U1TI = 0;
if (gpio_p1_4_get()) {
SBUF1 = Buf[Count++];
while (U1TI == 0)
;
U1TI = 0;
}
}
}
#if SDCC < 370
void putchar(char c);
char getchar();
char getchar(void);
#else
int putchar(int c);
int getchar(void);
@ -243,9 +257,4 @@ inline void CH554WDTFeed(uint8_t tim)
WDOG_COUNT = tim; // Watchdog counter assignment
}
// Set pin p1.4 and p1.5 to GPIO output mode.
void gpio_init();
void gpio_set(uint8_t pin);
void gpio_unset(uint8_t pin);
#endif