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pcf8574-blinky v2

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Ajit Ananthadevan 2025-08-21 04:04:37 +10:00
parent 4baa62ef9a
commit 5db0144d4c
4 changed files with 270 additions and 0 deletions
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17
myapps/misc/pcf8574-blinky-refac/src/inc/pcf8574.h Normal file
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// PCF8574 driver header
#define PCFP0 0x01
#define PCFP1 0x02
#define PCFP2 0x04
#define PCFP3 0x08
#define PCFP4 0x10
#define PCFP5 0x20
#define PCFP6 0x40
#define PCFP7 0x80 //128
void pcf_init();
void pcf_setbits(uint8_t ports);
void pcf_resetbits(uint8_t ports);

24
myapps/misc/pcf8574-blinky-refac/src/main.c Normal file
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// LED on PORT0
#include "CH59x_common.h"
#include "pcf8574.h"
int main()
{
SetSysClock(CLK_SOURCE_PLL_60MHz);
pcf_init();
pcf_setbits(PCFP0);
while (1) {
mDelaymS(400);
pcf_resetbits(PCFP0);
mDelaymS(100);
pcf_setbits(PCFP0);
}
}

62
myapps/misc/pcf8574-blinky-refac/src/pcf8574.c Normal file
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// PCF8574 driver
#include "CH59x_common.h"
#include "pcf8574.h"
#define I2C_OWNADD 0x0001
void pcf_init()
{
I2C_Init(I2C_Mode_I2C, 100000, I2C_DutyCycle_16_9,
I2C_Ack_Enable, I2C_AckAddr_7bit, I2C_OWNADD);
I2C_GenerateSTART(ENABLE);
while (!I2C_CheckEvent(I2C_EVENT_MASTER_MODE_SELECT));
I2C_Send7bitAddress(0x40, I2C_Direction_Transmitter);
while (!I2C_CheckEvent(I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));
I2C_SendData(0xFF);
while (!I2C_CheckEvent(I2C_EVENT_MASTER_BYTE_TRANSMITTED));
I2C_GenerateSTOP(ENABLE);
}
/*
* set the ports OR'd together like: PCFP0 | PCFP1
*/
void pcf_setbits(uint8_t ports)
{
I2C_GenerateSTART(ENABLE);
while (!I2C_CheckEvent(I2C_EVENT_MASTER_MODE_SELECT));
I2C_Send7bitAddress(0x41, I2C_Direction_Receiver);
while (!I2C_CheckEvent(I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED));
uint8_t curr = I2C_ReceiveData();
while (!I2C_CheckEvent(I2C_EVENT_MASTER_BYTE_RECEIVED));
I2C_GenerateSTOP(ENABLE);
I2C_GenerateSTART(ENABLE);
while (!I2C_CheckEvent(I2C_EVENT_MASTER_MODE_SELECT));
I2C_Send7bitAddress(0x40, I2C_Direction_Transmitter);
while (!I2C_CheckEvent(I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));
I2C_SendData(curr | ports);
while (!I2C_CheckEvent(I2C_EVENT_MASTER_BYTE_TRANSMITTED));
I2C_GenerateSTOP(ENABLE);
}
void pcf_resetbits(uint8_t ports)
{
I2C_GenerateSTART(ENABLE);
while (!I2C_CheckEvent(I2C_EVENT_MASTER_MODE_SELECT));
I2C_Send7bitAddress(0x41, I2C_Direction_Receiver);
while (!I2C_CheckEvent(I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED));
uint8_t curr = I2C_ReceiveData();
while (!I2C_CheckEvent(I2C_EVENT_MASTER_BYTE_RECEIVED));
I2C_GenerateSTOP(ENABLE);
I2C_GenerateSTART(ENABLE);
while (!I2C_CheckEvent(I2C_EVENT_MASTER_MODE_SELECT));
I2C_Send7bitAddress(0x40, I2C_Direction_Transmitter);
while (!I2C_CheckEvent(I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));
I2C_SendData(curr & ~(ports));
while (!I2C_CheckEvent(I2C_EVENT_MASTER_BYTE_TRANSMITTED));
I2C_GenerateSTOP(ENABLE);
}