improve i2c; add gpio init functions; some minor fixups and cleanup

i2c is totally fucking broken though and needs to be replaced before con.

code/firmware/user/main.c

@@ -38,6 +38,50 @@ void systick_init(void)
     NVIC_EnableIRQ(SysTicK_IRQn);                   // enable interrupt
 }
 
+void gpio_init()
+{
+    GPIO_InitTypeDef gpio = {0};
+
+    gpio.GPIO_Speed = GPIO_Speed_2MHz;
+
+    // Soft I2C, USART TX/RX; currently unused
+    gpio.GPIO_Mode = GPIO_Mode_IPD;
+    gpio.GPIO_Pin = GPIO_Pin_4 | GPIO_Pin_5 | GPIO_Pin_6;
+    GPIO_Init(GPIOD, &gpio);
+
+    gpio.GPIO_Pin = GPIO_Pin_1;
+    GPIO_Init(GPIOA, &gpio);
+
+    // lightsense LED anode
+    gpio.GPIO_Mode = GPIO_Mode_Out_OD;
+    gpio.GPIO_Pin = GPIO_Pin_0;
+    GPIO_Init(GPIOD, &gpio);
+
+    // unused pins
+    gpio.GPIO_Mode = GPIO_Mode_IPD;
+    gpio.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_7;
+    GPIO_Init(GPIOC, &gpio);
+
+    gpio.GPIO_Pin = GPIO_Pin_2;
+    GPIO_Init(GPIOD, &gpio);
+
+    // I2C will be handled by the driver
+
+    // IS_SDB IS31FL3729 shutdown pin (active low)
+    GPIOC->BCR = GPIO_Pin_3;
+    gpio.GPIO_Mode = GPIO_Mode_Out_OD;
+    gpio.GPIO_Pin = GPIO_Pin_3;
+    GPIO_Init(GPIOC, &gpio);
+
+    // BTN1, BTN2 will be handled by button handler
+
+    // WP for EEPROM
+    GPIOC->BSHR = GPIO_Pin_6;
+    gpio.GPIO_Mode = GPIO_Mode_Out_OD;
+    gpio.GPIO_Pin = GPIO_Pin_6;
+    GPIO_Init(GPIOC, &gpio);
+}
+
 /*********************************************************************
  * @fn      main
  *
@@ -57,6 +101,9 @@ int main(void)
                             RCC_APB2Periph_GPIOC | RCC_APB2Periph_GPIOD |
                             RCC_APB2Periph_ADC1  | RCC_APB2Periph_TIM1, ENABLE);
 
+    // configure gpio pins
+    gpio_init();
+
     // get saved settings
     i2c_init();
     userconf_load();

code/firmware/user/src/31fl3729.c

@@ -18,6 +18,11 @@ void is31fl3729_init(uint8_t i2c_addr, uint8_t config, uint8_t global_current)
 {
     uint8_t buf;
 
+    // enable device
+#ifdef FL3729_SDB_PORT
+    FL3729_SDB_PORT->BSHR = FL3729_SDB_PIN;
+#endif
+
     // reset config registers
     buf = FL3729_RESET_VALUE;
     i2c_write_addr1b(i2c_addr, FL3729_REG_RESET, &buf, 1);

code/firmware/user/src/31fl3729.h

@@ -7,10 +7,14 @@
 
 
 
+#include <ch32v00x.h>
 #include <stdint.h>
 
 
 
+#define FL3729_SDB_PORT         GPIOC
+#define FL3729_SDB_PIN          GPIO_Pin_3
+
 #define FL3729_BASE_ADDR        0x68
 
 #define FL3729_ADPIN_GND        0

code/firmware/user/src/adc.c

@@ -13,13 +13,15 @@
 
 
 
+// deadzone fudge factors for potentionmeter. test on actual badge
+// and see if necessary, or if pot hardware + adc periph is good enough
 #define POT_LO          40
 #define POT_HI          (1024-POT_LO)
 
 
 
-uint16_t adc_idx;
 uint16_t adc_val[16];
+uint16_t adc_val_idx;
 uint16_t adc_avg;
 
 uint16_t lsens_val;
@@ -80,9 +82,9 @@ void adc_convert()
 void adc_read()
 {
     while(!ADC_GetFlagStatus(ADC1, ADC_FLAG_EOC));
-    adc_val[adc_idx++] = ADC_GetConversionValue(ADC1);
-    adc_idx &= 0x0f;
-    if (!adc_idx) adc_calc_avg();
+    adc_val[adc_val_idx++] = ADC_GetConversionValue(ADC1);
+    adc_val_idx &= 0x0f;
+    if (!adc_val_idx) adc_calc_avg();
 
     if (ADC1->CTLR1 & ADC_JAUTO) {
         while(!ADC_GetFlagStatus(ADC1, ADC_FLAG_JEOC));

code/firmware/user/src/eeprom.c

@@ -14,6 +14,7 @@
 #include <ch32v00x.h>
 #include <stdint.h>
 
+#include "eeprom.h"
 #include "i2c.h"
 
 
@@ -52,5 +53,26 @@ void eeprom_write_bytes(uint8_t page, uint8_t addr, uint8_t *data, uint8_t len)
     page |= EEPROM_BASE_ADDR;   // add address to page
     page <<= 1;                 // make i2c address from page
 
+    // disable systick interrupt
+    NVIC_DisableIRQ(SysTicK_IRQn);
+
+    // write the data
+#ifdef EEPROM_WP_PORT
+    EEPROM_WP_PORT->BCR = EEPROM_WP_PIN;
+#endif
+
+    while (i2c_ack_poll(page));
     i2c_write_addr1b(page, addr, data, len);
+    while (i2c_ack_poll(page));
+
+#ifdef EEPROM_WP_PORT
+    EEPROM_WP_PORT->BSHR = EEPROM_WP_PIN;
+#endif
+
+    // clear systick timer
+    SysTick->CNT = 0;
+    SysTick->SR = 0;
+
+    // re-enable systick interrupt
+    NVIC_EnableIRQ(SysTicK_IRQn);
 }

code/firmware/user/src/eeprom.h

@@ -9,10 +9,16 @@
 #define USER_SRC_EEPROM_H_
 
 
+#include <ch32v00x.h>
 #include <stdint.h>
 
 
 
+#define EEPROM_WP_PORT      GPIOC
+#define EEPROM_WP_PIN       GPIO_Pin_7
+
+
+
 void eeprom_read_bytes(uint8_t page, uint8_t addr, uint8_t *data, uint8_t len);
 void eeprom_write_bytes(uint8_t page, uint8_t addr, uint8_t *data, uint8_t len);
 

code/firmware/user/src/i2c.c

@@ -1,13 +1,23 @@
 /*
  * i2c.c
  *
- *  Created on: Jul 27, 2024
- *      Author: true
+ * routines more or less copied from WCH example code, then fucked around with to work.
+ *
+ * these routines have serious issues.
+ * - any i2c issue will lock up the machine, and there's no timeout handlers
+ * - there's no error handling of any kind
+ * - the library code makes some serious assumptions re: flags
+ *
+ * this MUST be fixed before con.
  */
 
 #include <ch32v00x.h>
 
 
+
+#define I2C_TIMEOUT 0xffff;
+
+
 void i2c_init()
 {
     GPIO_InitTypeDef gpio = {0};
@@ -87,5 +97,23 @@ void i2c_write_addr1b(uint8_t devaddr, uint8_t addr, uint8_t *data, uint8_t len)
         }
     }
 
-    I2C_GenerateSTOP( I2C1, ENABLE );
+    I2C_GenerateSTOP(I2C1, ENABLE);
+}
+
+int8_t i2c_ack_poll(uint8_t devaddr)
+{
+    int8_t addr_match = 0;
+
+    while(I2C_GetFlagStatus(I2C1, I2C_FLAG_BUSY) != RESET);
+    I2C_GenerateSTART(I2C1, ENABLE);
+
+    while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));
+    I2C_Send7bitAddress(I2C1, devaddr, I2C_Direction_Receiver);
+
+    if (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED))
+        addr_match = -1;
+
+    I2C_GenerateSTOP(I2C1, ENABLE);
+
+    return addr_match;
 }

code/firmware/user/src/i2c.h

@@ -19,6 +19,8 @@ void i2c_init();
 void i2c_read_addr1b(uint8_t devaddr, uint8_t addr, uint8_t *data, uint8_t len);
 void i2c_write_addr1b(uint8_t devaddr, uint8_t addr, uint8_t *data, uint8_t len);
 
+int8_t i2c_ack_poll(uint8_t devaddr);
+
 
 
 #endif /* USER_SRC_I2C_H_ */